Create BKS using portecle
open portcle
create new bks file
open downloaded certificate
save with entering pwds
use saved bks file in android app with the given passwords
Monday, March 11, 2019
Swift - AppToApp communication
communicate with using URL
---------
create url schemes
go to prokject-> info -> urlTypes
fill identifier - Actually there is no usage at all. you can use anything. only the sceme and role considered.
URL schemes - unique app scheme which other apps use to open the app, cannot use existing ios system schemes in here (https://developer.apple.com/library/content/featuredarticles/iPhoneURLScheme_Reference/Introduction/Introduction.html#//apple_ref/doc/uid/TP40007899)
Role -
Editor - schemes if we are defines
Viewer - existing schemes in iOS system (like photo viewer, email , sms apps)
how it works
if we want to open app2 from app1
in app2
identifier - dont know the correct usage. in apple Doc also not gives a full Description
schecme - used iPay
role - Editor (this is our own define scheme. so need to use as Editor. if systemdefine scheme should as view)
in App1
app1 we should also have to define url scheme for matching for appys2. scheme should be same and role should None.
identifier - can use anything
schecme - used iPay
role - None
let kCustomURLScheme = "ipay://" // only the sceme used. not identifier
let customURL = URL(string: customURLScheme)!
if UIApplication.shared.canOpenURL(customURL) {
if #available(iOS 10.0, *) {
UIApplication.shared.open(customURL, completionHandler: { (success) in
print("Open url : \(success)")
})
} else {
UIApplication.shared.openURL(customURL)
}
return true
}
** if we use same scheme for two application
system starts first installed application. if we uninstall first app then it will open second app.
Swift push notification
create project
add required POD
create apns key in apple developer portal
upload that token in to firebase project
------------
push notfication in appDelegate method execution steps
didFinishLaunchingWithOptions
didReceiveRegistrationToken -- this return the push token
didRegisterForRemoteNotificationsWithDeviceToken -- this will run when app kill and run again
send notification from firebase
app is in foreground - userNotificationCenter - willPresent
app in bg -
notification shows in notification bar
click on notification' - userNotificationCenter - didReceive
app kill and send notification (same as above)
notification shows in notification bar
click on notification' - userNotificationCenter - didReceive
-------------
{
"to": "PUSH_TOKEN_HERE",
"notification": {
"body": "You have authorized LKR 20.00 to test from your A/C *******0269 on 23-04-2018 at 11:10. TXN ID : 20857",
"title": "Payment Successful !!",
"icon": ""
},
"data": {
"notificationType": "WEB_PAYMENT",
"data": {
"instrumentReference": "W000000000000631"
}
}
}
notification - this part automatically handled by app when only app in background (both android and ios). it shows notification. we need to pass body and title
data - this part only trigger when app is in forground (in both ios & android). we can catch these values inside data object.
CocoaPods
CocoaPods manages library dependencies for your Xcode projects.
The dependencies for your projects are specified in a single text file called a Podfile. CocoaPods will resolve dependencies between libraries, fetch the resulting source code, then link it together in an Xcode workspace to build your project.
POD
command line tool to work with pod files
Installation
sudo gem install cocoapods
pod required ruby installation. checko ruby version
ruby -v
to maintain pod local repository use
pod setup
this will create master repo in user-> name-> .cocoapods -> repos...
i think this is lile maven repo. we can maintain repo from local rather than downloading same repo.
this is the main repo path
https://github.com/CocoaPods/CocoaPods
add pod in to project
pod init
to init pod it needs a xcode project. without project no pod init ;)
this will create a pod file.
open pod file using text editor
use xcode interminal use this command
open -a Xcode Podfile
adding required library projects as this
pod 'JLocationKit', '~> 1.0.3'
downloading lib projects
pod install
update missing pods
pod install --repo-update
to run pod project open xcode using App.xcworkspace
do not open using project file
remove pod from a project
$ sudo gem install cocoapods-deintegrate cocoapods-clean
$ pod deintegrate
$ pod clean
$ rm Podfile
uiviewcontroller life cycle
viewDidLoad
viewWillAppear
viewDidAppear
applicationDidBecomeActive - AppDelegate
applicationWillResignActive - AppDelegate
home click
----------
applicationDidEnterBackground - AppDelegate
applicationWillEnterForeground - AppDelegate
again open app from icon click
--------------
applicationDidBecomeActive - AppDelegate
applicationWillResignActive - AppDelegate
app killed by using running apps
---------------
applicationWillTerminate - AppDelegate
viewDidLoad - oncreate
viewWillAppear - onresume
viewDidAppear - onresume
viewWillDisappear - onpause ( these will called when open another controller, not at home click )
viewDidDisappear - ondestroy ( these will called when open another controller , not at home click)
Swift localization
select project-> info -> localization
click + sign and select required languages
in ios string files can add in two places
for storyboard wise localization
these strings cannot apply programatically
in inspector tab select required locations
this will create new string files in project->project name folder-> lancode.IProj folder -> Main.String
if launcher storyboard localization added it will create LaunchScreen.strings file in same folder
*** These language applied when user changed the device language in setting.
when app specific language change can do by changing the budle as below. but user needs to restart the app to use these strings.
programatically access strings
select project-> new file -> String -> name as Localizable.strings (name should be this)
this will create a file in project-> Localizable.strings file
select that file and click localize button in inspector tab
select required languages
add strings in this format
"key" = "value";
these string files access in program by attach bundle path to these files. to change path
let path: String? = Bundle.main.path(forResource: lang, ofType: "lproj")
if path == nil {
bundle = Bundle.main
}
else {
bundle = Bundle(path: path!)
}
Swift- Working with rest service
protocol - rules
subdomain - point a more specifc server or etc
domain - unique reference to specific site
port -
path - refer specifi sub directory or file
query param - more detail of request
request type - GET, POST etc
headers - key value pair which tells server how to handle the request
response also has header which describe how the client use the information
body - data send or received
playgroud setup for network request
playground default support for synchronous request. means lines runs top to bottom. so to call network requet has some changes in playground. add these lines in top
import PlaygroundSupport
PlaygroundPage.current.needsIndefiniteExecution = true
///////////////////////
like in java we can seperately invoke service call and get the response as callback function. everything step by step in here. last class is using all concepts
import Foundation
import PlaygroundSupport
PlaygroundPage.current.needsIndefiniteExecution = true // make playgroud to run asnchronous request
//let url = URL(string: "https://api.nasa.gov/planetary/apod?api_key=NNKOjkoul8n1CH18TWA9gwngW1s1SmjESPjNoUFo")!
//let task = URLSession.shared.dataTask(with: url) { (data, response, error) in
//// if let data = data {
//// print(data) // print as bytes
//// print(data as? NSData)// print as object
//// }
//
// //get as json object
// if let data = data,
// let string = String(data: data, encoding: .utf8) {
// print(string)
// }
// // end of return json object
//}
//
//task.resume()
///////////////////////////////////////////////////////////
// add query parameters seperately
//extension URL {
// func withQueries(_ queries: [String: String]) -> URL? {
// var components = URLComponents(url: self, resolvingAgainstBaseURL: true)
// components?.queryItems = queries.flatMap
// { URLQueryItem(name: $0.0, value: $0.1) }
// return components?.url
// }
//}
//
//let baseURL = URL(string: "https://api.nasa.gov/planetary/apod")!
//let query: [String: String] = [
// "api_key": "NNKOjkoul8n1CH18TWA9gwngW1s1SmjESPjNoUFo",
// "date": "2011-07-13"
//]
//
//let url = baseURL.withQueries(query)!
//let task = URLSession.shared.dataTask(with: url) { (data,
// response, error) in
// if let data = data,
// let string = String(data: data, encoding: .utf8) {
// print(string)
// }
//}
//
//task.resume()
///////////////////////////////////////////////////////////
/*josn serilization
struct PropertyKey {
static let title = "title"
static let description = "explanation"
static let url = "url"
static let copyright = "copyright"
}
class PhotoInfo{
var url : URL
var description : String
var title : String
var copyright : String?
init?(json: [String: Any]) {
guard let title = json[PropertyKey.title] as? String,
let description = json[PropertyKey.description] as? String,
let urlString = json[PropertyKey.url] as? String,
let url = URL(string: urlString) else { return nil }
self.url = url
self.description = description
self.title = title
self.copyright = json[PropertyKey.copyright] as? String
}
}
extension URL {
func withQueries(_ queries: [String: String]) -> URL? {
var components = URLComponents(url: self, resolvingAgainstBaseURL: true)
components?.queryItems = queries.flatMap
{ URLQueryItem(name: $0.0, value: $0.1) }
return components?.url
}
}
let baseURL = URL(string: "https://api.nasa.gov/planetary/apod")!
let query: [String: String] = [
"api_key": "NNKOjkoul8n1CH18TWA9gwngW1s1SmjESPjNoUFo",
"date": "2011-07-13"
]
let url = baseURL.withQueries(query)!
let task = URLSession.shared.dataTask(with: url) { (data, response, error) in
if let data = data,
let rawJSON = try? JSONSerialization.jsonObject(with:data),
let json = rawJSON as? [String: String],
let photoInfo = PhotoInfo(json:json) {
print(photoInfo)
}
// to get normal json object use this way
// if let data = data,
// let rawJSON = try? JSONSerialization.jsonObject(with:
// data),
// let json = rawJSON as? [String: String] {
// print(json)
// }
}
task.resume()
**/
//////////////////////////
//getting a callback with params
/* func performLongRunningOperation(callbackFuncName: @escaping (retunFunctionParam1,retunFunctionParam2) ->
Void) {
// Code that performs a long running operation
successFunc(returnParam1Value,returnParam2Value)
}
//example
func callService (callbackFunc : @escaping (String, Int) -> Void) {
callbackFunc("hi", 10)
}
// pass callback function as parameter and other parameters also
func callService (urlStr : String, callbackFunc : @escaping (String, Int) -> Void) {
callbackFunc("hi", 10)
}
callService (urlStr: "sss",callbackFunc : { (strVal,intVal) in
print(strVal)
})
*/
///////////////////////////// network request with callback
struct PropertyKey {
static let title = "title"
static let description = "explanation"
static let url = "url"
static let copyright = "copyright"
}
class PhotoInfo{
var url : URL
var description : String
var title : String
var copyright : String?
init?(json: [String: Any]) {
guard let title = json[PropertyKey.title] as? String,
let description = json[PropertyKey.description] as? String,
let urlString = json[PropertyKey.url] as? String,
let url = URL(string: urlString) else { return nil }
self.url = url
self.description = description
self.title = title
self.copyright = json[PropertyKey.copyright] as? String
}
}
extension URL {
func withQueries(_ queries: [String: String]) -> URL? {
var components = URLComponents(url: self, resolvingAgainstBaseURL: true)
components?.queryItems = queries.flatMap
{ URLQueryItem(name: $0.0, value: $0.1) }
return components?.url
}
}
//The @escaping keyword tells the compiler that the code in the closure will be executed after the function has returned, or has finished executing all the code.
func callService(urlStr:String , funcCallback : @escaping (PhotoInfo) -> Void) {
let baseURL = URL(string: urlStr)!
let query: [String: String] = [
"api_key": "NNKOjkoul8n1CH18TWA9gwngW1s1SmjESPjNoUFo",
"date": "2011-07-13"
]
//here multiple conditions checking using , instear && mark
let url = baseURL.withQueries(query)!
let task = URLSession.shared.dataTask(with: url) { (data, response, error) in
if let data = data,
let rawJSON = try? JSONSerialization.jsonObject(with:data),
let json = rawJSON as? [String: String],
let photoInfo = PhotoInfo(json:json) {
funcCallback(photoInfo)
}
}
// if let data = data{
// print(data)
// let rawJSON = try? JSONSerialization.jsonObject(with:data)
// if let jsona = rawJSON as? [String: String] {
// if let photoInfoa = PhotoInfo(json:jsona){
// funcCallback(photoInfoa)
// }
// }
// }
task.resume()
}
var urls = "https://api.nasa.gov/planetary/apod"
callService (urlStr: urls, funcCallback: { (photoInfoObj ) in
print(photoInfoObj.title)
} )
//we can call this way also.
callService (urlStr: urls) { (photoInfoObj ) in
print(photoInfoObj.title)
}
Swift UI Navigation
using navigation controller
using normal segues direclty link to viewcontrollers
using segues programatically (use segue id to navigate after check conditions)
https://developer.apple.com/library/content/referencelibrary/GettingStarted/DevelopiOSAppsSwift/ImplementNavigation.html
A navigation controller manages transitions backward and forward through a series of view controllers. The set of view controllers managed by a particular navigation controller is called its navigation stack. The first item added to the stack becomes the root view controller and is never popped off (removed from) the navigation stack.
add navigation controller to scene
select scene doc
Choose Editor > Embed In > Navigation Controller
the story board entry point will be automatically added to navigation controller
this will add a bar in all scenes called navigation bar. this can handle all backword and forward navigation
to use auto back item
add Navigation item to view. this will automatically add back arrow and click will move to back.
the segue shoud show. not work for present as popover
to use button add
add bar buttons for add back and forward.
To go back
dismiss(animated: true, completion: nil)
To go forward
click -> control drag to relavant scene
create super view controller and make other viewCOntrollers as children. make commont nav bar button items click event if you want and link click event with super controller function.
using normal segues direclty link to viewcontrollers
in this normal button use. no navigation controller. button segue link with view controller. to go back click use "Unwind Segue" way. it means
if you want to come back second to first
in first viewcontroller add method like
@IBAction func funcName(unwindSegue: UIStoryboardSegue) {}
in secind button click+control+ drag to exit icon in viewController header. this will suggest that function, it will auto do back process.
using segues programatically
here we add buttons to normal way to viewcontroller. but create segeue is doing by click on firstviewController header bar yellow icon(first icon)+ control+ drag to second view controller. another segue like same wat to another viewController. remember to add segue identifier.
then create action event to each button by normal control+click+ drag to viewcontroller. add this line to connect with each segue
performSegue(withIdentifier: "segue_id", sender: nil)
this way can use to check condition and open specific view controller
to perform back event in second to first use above any way.
pass values from viewControllers
https://stackoverflow.com/questions/5210535/passing-data-between-view-controllers?rq=1
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
let secViewCtrl = segue.destination as! SecondVcViewController
secViewCtrl.strFromFirst = "From first".
}
in secondvc create var
var strFromFirst
tabviewcontroller
drag view controller to story board and editor-> embed in -> tab bar controller
connect other view controllers as normal way by click + control+drag
UIViewController life cycle
https://developer.apple.com/library/content/referencelibrary/GettingStarted/DevelopiOSAppsSwift/WorkWithViewControllers.html
viewDidLoad. - like oncreate
viewWIllAppear. - like onresume
ViewDidAppear
viewWIllDisappear. - like onpause
viewDidDisappear - can handle ondestroy part.
when app open
TabFirstViewController - viewDidLoad
TabFirstViewController - viewWillAppear
TabFirstViewController - viewDidAppear
swcond VC load
TabSecondViewController - viewDidLoad
TabFirstViewController - viewWillDisappear
TabSecondViewController - viewWillAppear
TabSecondViewController - viewDidAppear
TabFirstViewController- viewDidDisappear
back to first VC
TabSecondViewController - viewWillDisappear
TabFirstViewController - viewWillAppear
TabFirstViewController - viewDidAppear
TabSecondViewController - viewDidDisappear
kill app in first VC
TabFirstViewController - viewWillDisappear
TabFirstViewController- viewDidDisappear
what to handle viewWillDisappear vs viewDidDisappear
when viewWillDisappear called next viewDidDisappear called. viewWillDisappear can use to hide keyboard, save edits etc. viewDidDisappear can use to stop running services etc
Swift Reference
var str = "Hello"
declaring constant
let str ="hello"
str = "world" // this wont compile constant cannot reassign
data types
Int , Double, Bool, String, Character
String equality check
empty check
str.isEmpty
double equal ==
this check identical caharacter in same order. simple capital cases checked here
.contains
check substring found or not
if condition
same as java. but && can check using , in swift
var x = 10
if x != 9, x != 10 , x != 6 {
print("aaa")
}else {
print("bbb")
}
output = bbb
optionals ? !
variable without initialize and use throw compile time error
//var y // swift is type safety. so cannot use without type
//var y = 10 // this is ok. type is int
//var y : Int
//print(y) // this return errr because no value
var y : Int?
//print(y) // this print nil
//print(y!) // this is error. beacause cannot use nil value because of optional
var z = y // this is fine. but assign nil value to z. this may cause crash
//var z2 = y! // ! use to wrap z2 as int. this raise error because nill value
// so have to check nill. two ways
if y != nil {
// var z2 = y // without unwrapping z is not idetified as INT
// var k = z2 + 5 // so without z2 type raise error
var z3 = y! // Wrap using ! to Int value
var k2 = z3 + 5 // now z3 is Int . so run fine
}
// second way. best way
if let y2 = y {
print(y2)
}
** so in my knowledge optional is use to make app without crash due to nil value. we have to use if let for optional variables and else part to handle nil values
declaring function
func funcName( name : String, lastname : String){
print("my name is \(name) \(lastname)")
}
2nd way
func aa(x1 var1:String, x2 var2 :String){
print ("hello v\(var1) df \(var2)")
}
aa(x1: "dd", x2: "sdasd")
invoke function
funcName(name: "thu",lastname: "wijre")
invoke. function without variable name
define function parameter with underscore
func abc(_ name:String){
print (name)
}
abc( "dsfdsf"). // no need to add variable name when invokint if uderscore used
function with default parameter values
func abc(_ name:String, age : Int = 10){
print ("\(name) sdfdf \(age)")
}
abc( "dsfdsf")
function return value
func returnInt(x1 :Int, x2 :Int) ->Int{
return x1+x2
}
print (returnInt(x1: 10, x2: 20))
enum
like enum in java. same concept
enum CompassPoint {
case north, east, south, west
}
usage
let compassHeading: CompassPoint = .west
switch compassHeading {
case .north:
print("I am heading north")
structures
structures are same as classes but no inhertance in structures.
struct xx{
var x2=10
func printX(){
print(x2)
}
}
var a1 = xx()
//let a1 = xx() // this cannot be done. constant cannot assign properties. because next line trye to assign x2 value.
a1.printX()
a1.x2 = 89
a1.printX()
this is OK
let b1 = xx().x2
print(b1)
let b2 = xx(x2: 50)
print(b2)
Initializers
“All Swift types come with an initializer, which is similar to a function that returns a new instance of the type. The default initializer is init().”
var string = String.init() // ""
var integer = Int.init() // 0
var bool = Bool.init() // false”
this is short version
var string = String() // ""
var integer = Int() // 0
var bool = Bool() // false”
Memberwise initializer
struct Person {
var name: String
func sayHello() {
print("Hello, there!")
}
}
let person = Person(name: "Jasmine")
initialize multiple values
struct Temperature {
var celsius: Double
init(celsius: Double) {
self.celsius = celsius
}
init(fahrenheit: Double) {
celsius = (fahrenheit - 32) / 1.8
}
}
let currentTemperature = Temperature(celsius: 18.5)
let boiling = Temperature(fahrenheit: 212.0)
print(currentTemperature.celsius)
print(boiling.celsius)
mutating methods
in cases need to update values using instance methods rather than using above init methods u need to use mutating keyword
struct test{
var x : Int = 0
mutating func increment(){
x = x+1
}
mutating func incrementByVal(by val : Int){
x = x+val
}
func printx(){ // here no updation. so no need mutating keyword
print(x)
}
}
var a = test()
a.increment()
a.incrementByVal(by: 5)
a.printx()
same class declarion is here
class test1{
var x : Int = 0
func increment(){
x = x+1
}
func incrementByVal(by val : Int){
x = x+val
}
func printx(){
print(x)
}
}
var a1 = test1()
a1.increment()
a1.incrementByVal(by: 5)
a1.printx()
computed properties
property to perform a calculation to return value use this way
struct temp{
var celcius :Double
var farenhite : Double {
return celcius + 32
}
}
let b1 = temp(celcius: 24)
print(b1.farenhite)
Property Observers
Swift allows to get previous value when set a new value. willset and didset keywords used
here two more keywords, newValue oldValue
struct test{
var x :Int = 10{
willSet{
print("new val \(newValue)")
}
didSet{
print("Old val \(oldValue)")
}
}
}
var x = test()
x.x = 9
output
new val 9
Old val 10
static veriables and methods
struct test{
static var x :Int = 10;
static func m(){
print("m")
}
}
print(test.x)
test.m()
** static vars cannot use in when instantiated
var aa = test()
aa.x = 20 // this cannot done. error
copying
assign a structer to a variable and again changed structer may not changed previous assigned value
struct test{
var x :Int = 10;
static func m(){
print("m")
}
}
var t = test()
var t2 = t
t.x = 20
print(t.x)
print( t2.x)
output
20,10
self
self refers to the current instance of the object. like this in java
Variable Properties
if assigned structer instance to a constant you cannot change structer variable too
struct test{
var x :Int = 10;
}
let t = test()
t.x = 3. // this is compile error
create class
same as above discussed structer. only difference is classes can iherited.
in same file you cannot use class and structer using same name. :)
class A{
var x="etstwrwrt";
func printx(){
print(x)
}
func A(){
print ("df")
}
}
instantite class
let a = A()
a.printx()
a.A()
aa(x1: "wq", x2: "ere")
Constructor
not like in java. constructor no need class name. just require init keyword
class A{
init() {
print ("A1")
}
func A(){// this is not a contructor. work as normal function
print ("A2")
}
}
var x = A()
x.A()
Inheritance
same as in java
class A{
var x :Int = 10
}
class B : A{. // inherit class A (use : )
func printXInB(){
print(x)
}
}
var x = B()
x.printXInB()
override
only functions can override, not varibles. sholud use override keyword
class A{
var x :Int = 10
func printX(){
print(x)
}
}
class B : A{
override var x : Int = 90. // this is not allowed
var x : Int = 90 // this is not allowed
override func printX(){ // functions can override using override keyword
var x : Int = 90. // this is ok. initialization inside function
x = 80. // this change function variable
print(x)
}
}
super
use super keyword to override super class variables
class A{
var x : Int = 10
init(x : Int) {
self.x = x
print(x)
}
}
class B :A{
init() {
super.init(x: 20)
}
}
var b = B()
reference
in structer we discuss this in copy section. but in class when we instance a class it store in memory. when we copy the referenct to another variable it also refer same memory location. but in structer when copy instance it create another memory location. so in classes newly refence var update class var or constant it will change both reference var values
class A{
var x : Int = 10
}
var a = A()
var a2 = a
a2.x = 20
print(a.x). // output as 20
class ot structure
Because classes and structures are so similar, it can be hard to know when to use classes and when to use structures for the building blocks of your program.
As a basic rule, you should start new types as structures until you need one of the features that classes provide.
Start with a class when you're working with a framework that uses classes or when you want to refer to the same instance of a type in multiple places.
when you need to maintain stable identity (want to get updated value rather than copied) use classes
protocol. - seems like interfaces in java
A protocol defines a blueprint of methods, properties, and other requirements that suit a particular task or piece of functionality.
creating variable
var varname : String {
get
}
every variable sholud mark inside curly bracket with get or set (get means readonly var and set means write. get set means read and write)
protocol testp{
var x : Int {
get set. // var as getter and setter. cannot only setter. but can only getter
}
func printx() // need to overrite in inherited classes or structs
}
class A : testp{
func printx() {
print("dd")
}
var x : Int {
get{
return 10
}
set (newVal){
print(newVal) // setter happen here. enter anythig when set value. but cannot assign like this x = newVal
}
}
}
let a1 : A = A()
print(a1.x) // print 10
a1.printx() // print dd
a1.x = 98 // print 98
extension
extensions is add new functionality to anything
extension String {
func sayHello(){
print("hello")
}
}
var str = "hi"
str.sayHello()
///////////////////////
extension Int{
func square() -> Int {
return (self * self)
}
}
var x = 8
print(x.square())
//////////////////////
class User {
var firstname = "hello"
var lastname = "swift"
}
extension User{
// var fullname : String = firstname + " " + lastname // cannot use variables in extensions
func getFullname() -> String {
return firstname + " " + lastname
}
}
var bob = User()
print (bob.getFullname())
closure
this is work same as functions but these has noname and no func keyword, and also very short
func adding (x : Int, y :Int) -> Int{
return x + y
}
print(adding(x: 5, y: 6))
var addClosure : (Int, Int) -> (Int) = { x, y in
return x + y
}
//shortestway
var addClosure2 : (Int, Int) -> (Int) = {
return $0 + $1 // can use param order with $ sign
}
print(addClosure(5,6))
print(addClosure2(5,6))
//var addClosure : (firstParamType, SecondParamTyoe) -> (ReturnType) = { FirstParamRefereName, secondParamRefereName in
// return x + y // operation
//}
// without parameters
// normal way
func printHello () -> String{
return "hello"
}
// with closure
var helloClosure : () -> (String) = {
return "hello"
}
print(printHello())
print(helloClosure())
collections
Arrays
var x : [Int] = [2] // declare array
x [0] = 12
var y : Array<Int> = [2] // declare array
y[0] = 23
var z = [Int] () // declare array
z = [2]
z[0] = 8
var a1 = [Int] (repeating : 0 , count : 100) // declare array with 100 zeros
print(a1[20])
var x1 = ["abc", "cde", "dfds"] // can contains only single type
var x2 : [Any] = ["abc", "cde", "dfds",10] // can caontaint any type
var x3 : [String] = ["abc", "cde", "dfds"] // can contain only String type
print(x[0])
//print(y[0])
print(x1[0])
x1.insert("bbb", at : 0) // insert item dynamically. here at value sholud inside array length.
print(x1[0])
Dictionary
dictionary is a associated key with a value. key is unique. dictionay arrange as alphabatically order to search easy
var ff = ["a" : 100, "b" : 45]
//var ff = ["a" : "ttt", "b":45] // this is compile error, cannot contain different types
print(ff["a"])
var x1 = Dictionary<String,Int>()
x1.updateValue(120, forKey: "xx")
print(x1["xx"])
var a1 : [String : Int] = [:] // initialize empty dictionary
a1.updateValue( 134, forKey: "aa") // key and value
print(a1["aa"])
Loops
for loop
for i in 1...5 { // included 5 also here
print("xx \(i)")
}
var x1 = ["a","b","c"]
for c in x1 {
print(c)
}
for letter in "abcd".characters{
print(letter)
}
// index with value
for (index,letter) in "abcd".characters.enumerated(){
print("\(index) \(letter)")
}
// output
//0 a
//1 b
while loop
var x = 0
while x < 3
{
print(x)
x = x+1
}
My Git experience
need homebrew
https://brew.sh
/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
install gitflow
https://github.com/nvie/gitflow/wiki/Mac-OS-X
$ brew install git-flow
initialize gitflow
git flow init
this will ask to provide release and development branches. this means you need to maintain two different main branches to development and release. If you already created branches in origin, bring them in to local by
git checkout origin/branchname
this will automatically switch you to that branch.
then do required things once tyoe git flow init.
init Initialize a new git repo with support for the branching model.
feature Manage your feature branches.
release Manage your release branches.
hotfix Manage your hotfix branches.
support Manage your support branches.
version Shows version information.
git flow cheat sheet
https://danielkummer.github.io/git-flow-cheatsheet/
start new feature
git flow feature start feature_name
commit changes to feature branch
add files
git add .
commit
git commit -m "message"
finish feature
git flow feature finish feature_name
this will
Merges MYFEATURE into 'develop'
Removes the feature branch
Switches back to 'develop' branch
push local developemnt to origin
you should be in local development branch
git push
cannot use branch name as release due to create releases
git flow release start
these branches create under release . so no more release branches there
/////////////////
delete branch
git branch -d branch_name
delete remote branch
*** in Origin there is a master branch, which means this branch is the main branch. other all branches merege with this. you cannot delete this master branch.
$ git push -d origin <branch_name>
deleted orign branch sync with local
git fetch -p origin
*** in Origin there is a master branch, which means this branch is the main branch. other all branches merege with this. you cannot delete this master branch.
Tagging
add tag
git tag tagname
push tag to origin
git push origin tag_name
or
git push --tags
merge conflicts
git mergetool
this will ask switch merge tool to open.
press enter and merge conficts and commit and push if works fine
merge branches
merge dev changes to master
in master
git merge develop
see previous commit changes
git show
see changes before commit
git diff
changes of a file
git diff filename.extension
difference between two branches
git diff branch_1..branch_2
use two dots between two branch names
reset
Reverting The Working Copy to an Older Commit
git reset commit_id (56e05fced )
git reset commit_id f9be0cde2e091368b8e3241a0e8d0a55bd6fa7a3
Reverting Working Copy to Most Recent Commit
git reset --hard HEAD
remove untracked files
git clean -f -d
view history
git log
discard changes
git stash
rename remote branch
$ git branch new-branch-name origin/old-branch-name
$ git push origin --set-upstream new-branch-name (remember to change main branch in remote before this command)
$ git push origin :old-branch-name
remote deleted branch show in local. to delete it from local use
git remote prune origin
create gitignore file in mac
opent terminal
touch .gitignore
see ignore files
git status --ignored
To stop tracking a file that is currently tracked, use git rm --cached. (these filese should mention in .gitignore file)
git rm --cached iPay.xcodeproj/project.xcworkspace/xcuserdata/Thushara.xcuserdatad/UserInterfaceState.xcuserstate
git rm --cached .DS_Store
stuck in merge conflicts when feature finish
best thing is to forcely checkout to other branch without commit existing merge.0712773696
git checkout -f feature/ft
////////////////////
git maintain in submodule
https://blog.shopsys.com/how-to-maintain-multiple-git-repositories-with-ease-61a5e17152e0
https://git-scm.com/book/en/v2/Git-Tools-Submodules
///////////////
teams with plan
--------------
with the free plan one team can handle only with 5 users.
https://confluence.atlassian.com/bitbucket/plans-and-billing-224395568.html
structure is
team
project
repository
team has members
reposiroty has owner (it can be a team or individual, for free plan 1 repository can use only 5 members (sum of team members and individuals))
project has repositories
at any time repo can transger to any project. many teams can access one repository.
/////////////////
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