Swift

Typealiastypealias is used to redefine the name of a type that already exists, and by naming it, you can make the code clearer. The syntax used is also simple, as with the Typealias keyword, you can assign a new name to a type that already exists,

swift4.xController comes with xib load in iOS8 system crashes// MARK:-resolves a problem with the controller's own xib loading in the iOS8 system crash. ios8.x, need to give the controller Xib rewrite init method override init (nibname

The Swift struct is a common and flexible construct for building code.We can extend the functionality of a struct by defining attributes (constants, variables) and adding methods for the struct body.Unlike C and Objective C: Structs do not

Swift has been introduced for a long time, and some time ago suddenly wanted to try some simple classes with swift writing and then began a mixed journey.1. Refer to the Swift class in the OC code: Find a lot of information need to add a header file

1.UIWindow Properties:1>,-(void) Becomekeywindow; Override point for subclass. Don't call directly invoke window to make it a key window2>,-(void) Resignkeywindow; Override point for subclass. Do not call directly calls the window to cancel the key

After upgrading swift3, the data type of the Devicetoken returned when using the Didregisterforremotenotificationswithdevicetoken method, The printed Devicetoken value is "32byte".Here are two ways to go to print DevicetokenLet device = NSData (Data:

Objective A struct is a value type and is assigned only if it is given a variable or constant, or is called by a function. 1, the creation of the structure body Structure BASIC structurestruct 结构体名 { var 或 let 字段名 = 初始化值

One, the conceptDecorator Mode (Decorator): Dynamically adds some additional responsibilities to an object, and to extend the functionality of an object, adorners provide a more resilient alternative than inheritance.Multiple combinations, less

1, Defer In some languages, there are try/finally such control statements, such as Java. This kind of statement allows us to finally execute the code in the code block, regardless of the previous waves. In Swift 2.0, Apple provides defer

1. Type nesting Swift supports type nesting, which writes the definition of a type that needs to be nested in a nested type {} . The enumeration types in Swift can assist in implementing the functionality of a particular class or struct.

1. Type conversion 1.1 implicit type conversion Type conversions such as the C language 1.2 Explicit type conversions Swift language is a strongly typed language, and its integral type cast is to invoke the shaping extension construction

1,init (): Initialization method of a class (construction method)Class Student:nsobject { //classes attribute var name:string = "" var age:int = 0 //class constructor init (newname:string, Newage:int) { self.name = newName

1. Create a new Swift project first2. Creating a new OC class in Swift, such as a new Request class, is automatically generated. Xxxx-bridging-header class;3. Let the imported third-party header file into the import. For example: #import

One, the declaration of the string // declares an empty string "" // defines a variable type of string " Hello word! " // variable type not defined, the type of the variable is inferred from the value in Swift as

While Swift can be a purely code-based interface, it is sometimes a little inefficient to not take advantage of the first-use visualizer. Here's how to use the Xib design method, part of the code from the Web.(1) New view2. New View class3, in

Create UiactionsheetBe sure to indicate the type. Do not compile does not passFunc Actionsheet (Sender:uitapgesturerecognizer)??? {??????? Let Actionsheet:uiactionsheet = Uiactionsheet (title: "Is you sure?", Delegate:self, Cancelbuttontitle:

Enumerations are often used to implement certain functions for a particular class or struct. Similarly, enumerations can easily define a toolbar or struct to be used for a complex type. To implement this functionality, Swift allows you to define

A construction process is a preparation process that precedes an instance of a class, struct, or enumeration type. You must perform this procedure before a new instance is available, including setting the initial value of each stored-type property

Class func Ispassword (pasword: String), Bool { let pwd = "^ (?! [0-9]+$) (?! [a-za-z]+$] [0-9a-za-z]{6,16}$ ]Let regextestpwd = nspredicate (format: "Self MATCHES%@", pwd) if (regextestpwd. Evaluate (With:pasword) = = true) { return true

PrincipleWe know that using the Breadth-first search algorithm can find the shortest path to a target, but this algorithm is not considered weight , so after we have added weights for each edge, we need to use the Dijkstra algorithm to find the