Swift

Like a if statement, guard execution depends on the Boolean value of an expression. We can use guard statements to require that the condition must be true when the guard code is executed after the statement. Unlike if statements, a guard statement

original articles, welcome reprint. Reprint Please specify: Dongsheng's blogA closure expression can be passed as a function parameter, and if the closure expression is long, it affects the readability of the program. A trailing closure is a closure

classEbtappdelegate:uiresponder, uiapplicationdelegate {var window:uiwindow?func Application (application:uiapplication, didfinishlaunchingwithoptions launchoptions: [nsobject:anyobject]?) -Bool {Self.window=UIWindow (Frame:UIScreen.mainScreen ().

constants: constants cannot be assigned in scope and will not change, read-only, and each constant must have a unique name and memory space; Keyword: letvariable: the variable can be changed in the scope of the action, its value can be altered,

Creation of UIButton:(1) using Ctrl+drag drag-and-drop method in Stroyboard to create(2) Code creation: Uisegsmentedcontrol "Swift Code"     override func viewdidload ()  {         super.viewdidload ()         // Do any 

(1) Subtraction(2) Three mesh operation, remember that the following space if the error will not be added. It is estimated that it is an apple bug.(3) Aggregation operator, save a judgment, very humane(4) Interval operator Subtraction, wait.

The swift version of the enumeration variableSwift's enumeration type is very similar to the normal class, when used, do not think he is a constant, the following is the test with the source code////Viewcontroller.swift//Swiftenum////Created by

Alias alias Swift uses the Typealias keyword to define the type alias, which changes the name of the existing type.An array of collection types that are used to store values of the same type in an orderly manner.Assertion asserts that Swift uses

Abstract: Since the release of Swift, which has the innate ecological advantage of Apple, a variety of outstanding open source projects have emerged. The author of this paper, from a personal point of view, has made a screening and screening of the

Apple just released the swift programming language early this morning, and Swift is the new programming language for iOS and OS X applications. I believe many developers are learning the new language.No more nonsense, I'm going to learn to use Swift

Swift version of CircleviewSource////Circleview.swift//Circleview////Created by youxianming on 15/10/7.//copyright©2015 year youxianming. All rights reserved.//Import UIKitclassCircleview:uiview {//MARK:-Variablevar linewidth:cgfloat=1var

Typically filters an array, usually creating a function elsewhere in the code, and then invoking it for each element of the group. But doing so makes the code scattered in many places and is not easy to read. With closures, you can put related code

The problem of assigning a variable value1) constant let (it can be declared without assigning a value, but only once), variable var.2) When the declaration is assigned, the compiler automatically calculates the type.3) The display defines the

You can use the Messageui.framework framework to implement the SMS sending function, as follows:(1) First to determine whether the device has the ability to send SMS (2) If the device allows text messages to be sent, create a

In the past, Swift was trying to implement a singleton, which was nothing more than three ways: global variables, internal variables, and Dispatch_once methods. But it's a little cumbersome.Later, from version 1.2, Swift has addedThe support of

Swift about UIView Setting the frame value extensionUseDescription1. Use such as, very simple, no longer repeat2. Provide the Getter,setter method for the added calculation attribute in extensionSource////Uiview+setrect.swift//youxianming////Created

By using the list of static cells, we can easily make the page layout. The following is a demonstration using a "Add Task page".as follows:implementation steps:1, drag a tableviewcontroller into the storyboard and create a corresponding class

1, the picture left center right three-grid scale form//about 14 pixels not deformed, intermediate zoom let Imgtrackright = UIImage (named: "Slider_max") let Imgright = imgtrackright!. Stretchableimagewithleftcapwidth (topcapheight:0)

The following is a summary of the properties and methods commonly used in string1, determine whether it is empty: IsEmpty 123 varstr:Stringifstr.isEmpty{} 2, get the number of characters: countelements

1, when the picture size exceeds the screen, using Uiscrollview can implement the scroll bar view, that is, the finger touch scrolling screen to easily browse the entire page. 123456