Swift

Restricting access to code blocks, modules, and abstractions are accomplished through access control. Classes, structs, and enumerations can be accessed through the access control mechanism based on their own properties, methods, initialization

When you use TableView, the background color of the default selected cells is dimmed, as shown in the following figure: 1, using a custom background color You need to customize the background view when UITableViewCell is selected and set its

When the system is to display a view (UIView), it sends DrawRect (RECT:) messages to the view. So, if we need to draw on a view, we can implement it inside the DrawRect method. 1, filled rectangle with solid color The following

The difference between automatic recording and general recording is that you don't need to press the recording in the micro-letter and then let it go, but automatically judge the recording and the point of the stop based on the size of the voice,

　　Subscript scripts can be defined in the classes (class), struct (struct), enumeration (enumeration) targets, can be considered as access to the collection, list or sequence shortcuts, use subscript script index settings and get values, do not need

Boolean typeLogical, can only be true or false. expressed in bool.There are two Boolean constants: True and False.Mainly used in conditional judgment statements,If a non-Boolean value is used where the bool type is required, the type safety

Very simple with the private modifier, followed by the Limit keyword set:class Day{ privatevar0 func showRawValue(){ print("raw is \(rawValue)") } func forwardRawValue(){ 1 }}However, if the above class definition is in

Detailed Address: Http://www.code4app.com/forum.php?mod=viewthread&tid=9133#lastpostWhen I saw my code yesterday, I found my comment was too messy, and I couldn't see it clearly.Before using OC's time also used a simple comment, and then went to

starting with Xcode 8.0, all plugins are not working at this time! NSLog cannot output-this bug waits for the official version ...Xcode provides documentation comments shortcut key option + cmd +/But to upgrade the system to 10.11.5Swift:Color +

Use Map,Filter,Reduce to Array, dictionary, and other collection types in the Swift language (collection Type) may not be a habit for some people. For developers who have not been exposed to functional programming, the first reaction to processing

Error HandlingError handling is the process of responding to an error and returning from an error. Swift provides the first type of error support, including throwing, capturing, transmitting, and controlling recoverable errors at run time.Some

A destructor is called immediately before the instance memory of a class is freed. Use the DEINIT keyword to declare the destructor method, similar to the constructor method declared with Init. The destructor method is only applicable to class types.

Static methods are similar to static properties, anda static method , also known as a type method , is defined in Swift. Static methods are defined in the same way as static properties, where the keywords used by the enumeration and static methods

See if the following example code is used:  var studentlist:string[] = ["Zhang San", "John Doe", "Harry"] Studentlist[0] = "Zhuge Liang" var studentdictionary = [102: "Zhang San", 105: "John Doe", 109: "Harry"]

When using optional types and optional chains, the question mark (?) and exclamation point (!) are used more than once,but they have different meanings, let me explain in detail below.  1. Question mark (?) in the optional typeDeclares that this

original articles, welcome reprint. Reprint Please specify: Dongsheng's blog The app interacts with the user and relies on a variety of events. An event responder object is an object that can respond to an event and process it, and the responder

original articles, welcome reprint. Reprint Please specify: Dongsheng's blog used in the definition of a class Final keyword to declare classes, properties, methods, and subscripts. final declared classes cannot be inherited,andfinal declared

Assertion (assertions)Optionals allows us to detect whether a value exists. In some cases, if a value does not exist or does not provide a specific satisfying condition, the code should not continue to execute down.In these cases, you can use the

Original articles, welcome reprint. Reprint Please specify: Dongsheng's BlogThe Target and action (action) are medium event handling mechanisms for iOS and OS X app development.Questions raisedis a buttonlabelsample case design prototype that

1 //using if let to achieve the same effect as guard let, you will find that guard lowers a branch2 //You can use the If Var guard var to indicate that the defined variable can modify the value3 func test () {4Let name:string? = "zhang san"5 6