swift playground book tutorial

1 IntroductionApple has just released the Swift programming language early this morning, extracted from its published book, the Swift programming Language. We hope to help you with your IOSOSX development.Swift is a new programming language for iOS and OS X applications, based on C and objective-c, without some of the compatibility constraints of C.

Swift and objective-c A concise tutorial for mixingReprinted from: HTTPS://GITHUB.COM/LIFEDIM/SWIFTCASTS/TREE/MASTER/000_MIX_SWIFT_OBJCI think many iOS developers know Swift, the biggest problem in the mind is how to apply Swift to the original project. Below I will briefly describe the mix of these 2 languages, which

guarantees that the object is not freed in memory, when its reference count is 1. The ⑩ line Code REF2 = Ref1 is to assign a reference to the object to Ref2,ref2 and to establish a "strong reference" relationship with the object, when its reference count is 2. The first line of code REF3 = Ref1 is to assign a reference to an object to REF3,REF3 also to establish a "strong reference" relationship with the object, when its reference count is 3.The reference count of the employee object is then br

of the employee object is then broken by the REF1 = Nil statement in the code line, when it is referenced by 2. And so on, Ref2 = nil when its reference count is 1,REF3 = nil when its reference count is 0, when the reference count is 0, the employee object is freed.We can test to see the effect, if you set a breakpoint to step through debugging, you will find that the code runs out of line ⑨ after the console output:Employee Blake has been constructed successfully.The contents of the destructor

also to establish a "strong reference" relationship with the object, when its reference count is 3.The reference count of the employee object is then broken by the REF1 = Nil statement in the code line, when it is referenced by 2. And so on, Ref2 = nil when its reference count is 1,REF3 = nil when its reference count is 0, when the reference count is 0, the employee object is freed.We can test to see the effect, if you set a breakpoint to step through debugging, you will find that the code runs

IOS 9 App Development Essentials Tutorial next bookIntroduction: This tutorial is the first domestic iOS 9 development application tutorial. This tutorial is based on Xcode 7.0 and explains how to develop an app app for iOS 9 using the Swift 2.0 language.Learning advice: Thi

str1 = "Hello" var str2 = "World" var str = str1 + str2var str2 = "\ (str1) HWC and the \ (str2)"//hello HWC and the world6 uppercase and lowercase conversionsStr.uppercasestring//hello World str.lowercasestring//hello World7 prefix suffix equalsBool Hasprefix (prefix:string)Bool Hassuffix (suffix:string)var str = "Hello HWC" str.hasprefix ("Hello")//truestr.hassuffix ("123")//falsevar str1 = "Jack"if str = = str1{println ("Equal")}8 processing substringsvoid Insert (NEWELEMEMT:CHARACTER,ATIND

http://www.imooc.com/learn/127"Fun to Swift" Web tutorial notes, you have updated according to the syntax of 2.1.I.1. Learn and familiarize yourself with the features of swift language through playground.2. A tuple declaration can have a name for each meta, which can then be used. Accessvar t= (x:1, y:2, Z:"hi") // v

)))//llo wo 5 string concatenation Very simple answer, with a plus + or string interpolation var str1 = "hello" var str2 = "world" var str = str1 + str2 var str2 = "\(str1) hwc and the \(str2)" //hello hwc and the world 6 Case Conversion str.uppercaseString //HELLO WORLD str.lowercaseString //hello world 7 prefix suffix equals Bool Hasprefix (prefix:string) Bool Hassuffix (suffix:string) var str = "hello hwc" str.hasPrefix("hello") //true str.hasSuffix("123")