Swift

Using Swift to write an observer pattern, a collection of swift language classes, arrays, protocols, methods, strings, conditional control statements and some other syntax.A brief introduction to the observer pattern, in the observer pattern, would

Swift basic operatorlet a = 4 var b = ten b = a print(b) Let (x, y) = (1, 3) // now x = 1 y = 3 addition operations can also be used for stringslet dog:String = "Dogs" let cow:String = "Cows" let dogcow = dog + cow Print(dogcow)

There are two uses of range in Swift1. Convert the string to NSString to useHere is the conversion of Swift's character to NSString using let str:nsstring = text.string as NSString self.showmessage ("Tap:" +

Page 1 jumps to page 2, after page 2 Click button, the content of page 1 is changed. Actually using protocol (that is, interface in C #), convert page 1 viewcontroller to protocol incoming page 2 Viewcontroller, very similar to what we developed in

Before we dive into the initialization method, let's consider how the initialization in Swift is intended.is actually safe. In Objective-c, the Init method is very insecure: no one can guarantee that Init is called only once, and no one guarantees

Use of single cases in OC+ (instancetype) sharedmanager { staticID instance; Static dispatch_once_t Oncetoken; NSLog (@ "%ld", Oncetoken); Dispatch_once (&oncetoken, ^{ = [[Self alloc] init]; }); return instance;}Use of

Use of Didset In OC, we usually want to do some extra work after assigning a value to a variable. The most classic application is to customize the cell, through the model Setup method to complete the cell filling var length:int? { Didset {

: Playground-noun:a place where people can playimport uikit//fallthrough//Fallthrough will continue the next case//after the current case is executed if the next If a variable is declared in a case, you cannot use fallthroughvar coordinate = (1, 0

This article turns from CocoachinaThis article is translated by Cocoachina translator Leon (community ID) from KrakendevOriginal: The right-to-WRITE A SINGLETONPlease maintain the integrity of all content and links. In the previous post, we

Just started to learn these two symbols are not sure whether it is possible to replace each other with the confusion of today to do a good summaryIf you declare a variable as followsvar name:string? Only declares no initialization assignment stating

//Viewcontroller.swiftAnimationalert//Created by Su on 15/12/9.Copyright©2015 year Tian. All rights reserved.//Import UIKitClass Viewcontroller:uiviewcontroller {Override Func Viewdidload () {Super.viewdidload ()Grey Masking PlateLet Overlayview =

As a new language with hundreds of family, Swift has the innate ecological advantage of Apple, and its many outstanding open source projects on GitHub. Since the Swift language was released by Apple in June 2014, the author @swiftlanguage has been

As Apple's brand-new language, Swift has been in existence for more than a year now, but its development is not satisfactory today, but why?This is a mobile internet surging era, the application of millions of users abound, but most of the

//Collectionviewcontroller.swifttab//Created by Su on 15/12/8.Copyright©2015 year Tian. All rights reserved.//Import UIKitClass Collectionviewcontroller:uiviewcontroller, Uicollectionviewdelegate, Uicollectionviewdatasource {var

//the structure of CGRect, Cgpoint and Cgsize in 1.0 OC is as follows: structCGRect {Cgpoint origin; Cgsize size; }; structCgpoint {cgfloat x; CGFloat y; }; structcgsize {cgfloat width; CGFloat height; In

Protocol exampleprotocol{var simpledescription:string{get}Mutating func adjust ()}Class simpleclass:exampleprotocol{var simpledescription:string = "A very simple class"var anotherproperty:int = 69105Func Adjust () {Simpledescription + = "Now 100%

Property MonitorClass square{var width:double = 0 {willset{println ("willset--newvalue = \ (newvalue), CurrentValue = \ (width)")}didset{println ("didset--oldValue = \ (oldValue), CurrentValue = \ (width)")}}var girth:double {get{Return width *

A few days ago turned an introduction, and exclamation of the article, now I understand, record!The optional type variable in 1.swift indicates that the variable might have a value or be empty. You might think this is going to be done with just one

First, Swift defines two types of initializers for the class to ensure that all the stored properties in the class can get an initialization value. The two types of initializers are "specify initializers" (designated Initializer) and "convenience

//Lazy loading Tool bar PrivateLazy var Toolbar:uitoolbar =Uitoolbar ()//set the bottom bar Privatefunc Settoolbar () {//Adding child controlsView.addsubview (ToolBar)//Add constrainttoolbar.snp_makeconstraints {(make),