Swift

It is called operator overloading to have an existing operator operate on a custom class and struct or redefine an operation rule for an existing operator.1, add the custom two coordinate structure body objects by overloading the plus operator:

problem: When you want to initialize the page, use the Self.presentviewcontroller method to pop up a warning box uialertcontroller. But after the line reported the following alarm, and the alarm box can not come out. 1 2015 -

In iOS development, if you create a custom component, you can usually implement it by inheriting UIView. The following is an example of a scoreboard component that demonstrates the creation and use of components, as well as learning about

Property observers, similar to triggers. A property value change that is used to monitor properties except for initialization, which can be responded to when the value of the property has changed. Has the following characteristics:1, not only can

Poke links to see the final version Original linkTomasz SzulcOriginal Date: 2015/08/06Translator: mmoaay; proofreading: numbbbbb; Final: Shanks The Swift 2 in Xcode 7 Beta 5 has another feature: When using a one-to-many

Original articles, welcome reprint. Reprint Please specify: Dongsheng's BlogWhen we learn languages, we learn the types of data in this language, what are the types of data in Swift? Integer, float, Boolean, character, string these types are certain,

Original articles, welcome reprint. Reprint Please specify: Dongsheng's Blog When we learn languages, we learn the types of data in this language, what are the types of data in Swift? Integer, float, Boolean, character, string these types are

Swift UIView comes with some simple animations.If this is not a complex requirement, consider using the method here.Let's try it a little bit.First create three views to set the three-in-one background color Let View1=uiview (Frame:cgrectmake

Today is mainly to share with you is the use of closure in Swift, I personally think the closure is a shorthand method of functions, if you are not very familiar with the function of the swift Introduction-function1: Function typefunction type var

Directly on the code, as follows:/**    *  get the width and height of a string** @param text:nsstring* @param font:uifont** @return CGRect*/ classfunc gettextrectsize (text:nsstring, font: Uifont , Size: cgsize ),cgrect { var attributes =

Variable declaration 1, normal variable Swift, like JavaScript, can infer the type intelligently, and he will infer the type of the variable based on the value of our variable. var age = 10Intvar name ="lily"//The compiler will

First create a new. h file in Xcode and copy the following code in myuilabel.h// //// Created by yexiaozi_007 on 3/4/13.// Copyright (c) yexiaozi_007. All rights reserved.//#import typedef enum{ verticalalignmenttop = 0,//default

viewcontroller.swift//uiwindowimport uikitimport foundationclass viewcontroller:uiviewcontroller {@IBOutl ET weak var usrnamelabel:uitextfield! @IBOutlet weak var passwdlabel:uitextfield! @IBAction func Btntouch

The use of properties in Swift is much richer than the use of properties in Objective-c. Let me introduce each of them.One, storage properties and deferred storage propertiesThe demo is as follows:Class Dog { var name = "Wang Choi" init () {

In swift, scan the QRCode code as follows, and then look at the API's comments as soon as you tap it.Import Uikitimport foundationimport Avfoundationclass Viewcontroller:uiviewcontroller, avcapturemetadataoutputobjectsdelegate,uialertviewdelegate

//Main.swift12-//Created by Wanghy on 15/8/9.//Copyright (c) years Wanghy. All rights reserved.//// has a string that counts the number of occurrences of each character// train of thought one: utilize two for Looping for nesting//var array = ["1","2

1, what is the closure of the packageClosures are simply anonymous functions, lambdas functions , and the written point is that closures are self-contained function code blocks that can be passed and used in code to capture and store references to

What is an optional type?First of all, there is a problem with a string type variable in Swift that has a method called ToInt that converts a string variable to an int type variable.var"5"var intValue = stringValue.toInt();println("intvalue =

DefinedA tuple is an object that contains a number of associated variables.Creation of tuplesvar newTuple = ("kt",20)//由于Swift的类型推导，newTuple被推导为（String,Int）类型的变量Tuple's UnbindOnce a few variables are joined together and a tuple is formed, they are

Recently began to learn swift, the process of learning and summarized into a series, easy to review the summary later.Basic syntax Base syntaxNo semicolon is required at the end of each line in Swift, and multiple statements need to be separated