Swift

For the daily repetition of the possible extraction of the implementation as far as possible, such as implementing the navigation bar to the rightAdd Uibarbuttonitem If you use thePrivate Func Setupnavigateionbar () {Let btn = UIButton

: Playground-noun:a place where people can playimport uikitvar str = "Hello, Playground"///Sumfunc sum (array:array& lt;int>), Int {if Array.count = = 0 {return 0; } var Arraym = array Let first = Arraym.removefirst () return first + sum

1. Jump Implementation Method let url = URL(string:uiapplicationopensettingsurlstring) if uiapplication. Shared. Canopenurl (url!) {uiapplication. shared. OpenURL (url!) }eg: let url = URL(string: "prefs:root=notifications_id") 2. Jump to

var bgimage = Uiimageview ()var Backbutton = UIButton ()var Titlelabel = UILabel ()Let Screen_h = UIScreen.main.bounds.heightLet Screen_w = UIScreen.main.bounds.widthOverride Init (Frame:cgrect) {Super.init (Frame:frame)Initui ()}Required init?

Swift is a new language for developing IOS MacOS WatchOS and TvOS apps. However, if you have a C or objective-c development experience, you will find that many of Swift's content is familiar to you.Swift contains all the underlying data types on C

Use let to declare constants, and use Var to declare variables.The compiler automatically infers the type without having to explicitly declare the type and assign the value at the same time as the declaration. If the initial value does not provide

1. Hiding the status barThis problem is based on UIApplication.shared.isStatusBarHidden = true; The call is actually invalid ...Now write down your code and use it to remember ...1. First you need to duplicate this property of a hidden and then call

1. Weak unowned difference: from the surface of the behavior unowned is more like OC unsafe_unretained , and weak is OC weak . In layman's terms, unowned even if the original referenced content has been freed, it will still maintain an "invalid"

Nsurlconnection, abandoned after ios9.0, use Urlsession class later, such asSpecific examples:Self.imageV.frame = CGRect (x: -Y: -, width:kscreenwidth- +, Height: $) Self.view.addSubview (Self.imagev)//loading pictures with urlsessionLet URL = URL

var numbers = [0,1,2,3,4,5];var vowels = ["A", "E", "I", "O", "U"];var Emptyarr = [Int] ();Number of array elementsPrint ("The length of the array is: \ (numbers.count), \ (Vowels.count), \ (Emptyarr.count)");Empty sentenceIf Numbers.isempty {Print (

The design of Swift from forced unpackingI wonder if you have noticed that in a objective-c and swift mixed App, Swift will automatically force the variable to be unpacked when a parameter in OC is transferred to Swift. For example, I define such a

The For loop creates a 4*4 view and then animates all the view of the opposite side, where the effect of the animation is set:1, rotate Animation forTileinchbackgrounds{//Digital Block size is now the 1/10 of the original size of the

Enumeration type judgment1. Setting up and using enumerationsEnum weacher{Case a case b case c}var D=weacher.bswitch d{case A:print ("a") Case B:print ("B")//b Default: Print ("nil")}2. Using tuplesEnum Weacher{case A (int,string) case B (int,string)

1. Create a collection (unordered and non-repeatable)(1) Create an empty collectionvar a=set ()//[](2) Create a collectionvar a:set=[1,2,3]//[2,3,1]2. Insert in the middle of the collectionvar A:set=[1,2,3]a.insert (4)//[2,4,3,1]3, set (remove)

There is no use in Swift #Warning to prompt for warnings, and you can TODO: FIXME: achieve similar results by adding warnings.Build Phases---> Run script---> Add a new Build phases---> New Run script phaseTAGS="TODO:|FIXME:"echo "searching ${SRCROOT}

This section will refer to other applications for functions in Swift, including the following:Default parameter values and variable parameter values, constant parameters, return function types, and function nesting:First, default parameter values

1.swift pay attention to the use of point syntax, beginning will be a bit unaccustomed. Some of the code used by OC is used to change.2. We use #pramgram Mark #warning之类的标记注释 in OC, which is not available in Swift, we want to change//mark:

In swift, lazy loading is called only once, and if the value is emptied or set to nil, the method in lazy loading is not recalled again when called again1. Basic Use Method // * * Lazy loading of Swift, only once var label:uilabel = UILabel ()2

1,///define the model properties, generally defined as optional, you can simplify the code, do not need to write the Init methodIf it is a basic data type, it cannot be set to optional, and you want to set the initial value var name:string?

viewcontroller.swift//learn5////Created by MYHASPL on 16/1/23.//Copyright (c) 2016 MYHASPL. All rights Reserved.//import Cocoaimport Foundationclass viewcontroller:nsviewcontroller {override func ViewDidLoad () {super.viewdidload ()//Do any