Swift

1You can get through for-.in loops to iterate over the value of the entire array. 2 forIteminchShoppinglist {3 println (item)4 }5 //Six Eggs6 //Milk7 //Flour8 //Baking Powder9 //BananasTen If you want to get the index of each element and its

Variables and constants　　Swift declares a variable with Var and let declares a constant.Myconstant cannotbe modified Type deductionSwift supports type inference, so the above code does not need to specify the type if you need to specify the type:"

We generally use the following dispatch method:Explanation: The first sentence is asynchronous execution, the second sentence is deferred asynchronous execution, the third sentence is to run the background, and then update the UIThe

In Playgroundm, type the following code to find the maximum score and the minimum score in a score arrayFunc Maxminscore (scores:array)-(maxscore:int,minscore:int)? {//A tuple that can be emptyIf scores.isempty{return nil//To determine if there is a

Swift is the same as the OC Lazy loading mechanism, but this aspect of the domestic data is relatively small, today, the search engine for Bing after the discovery of Bing to find English \ The latest information is stronger than Baidu. We typically

Class Tabbarviewcontroller:uitabbarcontroller{var tabbarbgimg:uiimageview?var tabbarbgimgselected:uiimageview?var Selectedbutton:uibutton? Mark the selected buttonOverride Func Viewdidload (){Super.viewdidload ()Self.view.backgroundColor =

Swift has an underlying boolean type called BOOL. Boolean values are also known as logical values, because their values are only ture or false. Swift provides two Boolean constants, True and false:Let Orangesareorang = TrueLet turnipsaredelicious =

Function: A block of code that completes a specific task, by name, to indicate what the function doesFunc function name (formal parameter: parameter type)--return typeCommand +option+0 hide the box to the rightDefining functionsfunc SayHello

WebView control is to do the Web application development of the most used control, directly within the WebView to specify a page address to access the Web page, but also to implement the Uiwebviewdelegate protocol to implement the corresponding

4. Constants and variable declarationsThe variable declaration of OC uses the way the type variable name = variable value, where the type is a system built-in data type or a custom type, the variable name must start with the English letter and

Having previously talked about capturing the value of a control by storyboard, let's try to implement the same functionality in a pure code way. First define a stepper and a label, and use the label to display the current value of the

A class is made up of properties and methods, which are generally accessed by data members, and in Object-c, properties are designed to access the encapsulated data members, the properties themselves do not store data, the data is stored by data

Reprint please declare source: http://blog.csdn.net/jinnchang/article/details/444035371. UIButton OverviewInheritance: UIButton, Uicontrol, UIViewControl style:2. Initialization of UIButton(1) using the Buttonwithtype Build button, there are six

reprint Please declare source: http://blog.csdn.net/jinnchang/article/details/444071931. UIButton Overviewinheritance: Uiswitch, Uicontrol, UIView2. Control style3. Examples of Usevar Mybutton:uibutton?var myswitch:uiswitch?override func viewdidload

Today I have a problem with an array of integers, such as:var numbers = [3, 7, 12, 9, 200]It is now necessary to perform a series of identical subtraction operations on each of these numbers, such as adding 5 times 8 to each number minus 1, but such

First, closure of the conceptThere are 2 prerequisites for a computer language to support closures:1, Support function type, can pass function as parameter or return value;2. Support function nestingExample:Func caculate (opr:string)-(int,int)->int {

Functions can be defined in other functions as nested functionsFunc caculate (opr:string)-(int,int)->int {Func Add (A:int, b:int), Int {Return a + b}Func Sub (a:int,b:int), Int {Return A-B}var result: (int,int)-IntSwitch opr{Case "+":result =

The so-called construction process refers to a series of preparatory processes that are performed in creating an instance. For example, set an initial value for an attribute in an instance and perform other initialization work.The construction

1. Basic operatorsUnary operators:--, ++.-Arithmetic operator two-tuple operator: subtractionArithmetic assignment operator: a+=b,a-=bRelational operators: ==,!=,>,=,Logical operator:!,&,&& (short-circuit and, increase speed of operation), |,| |

There are several points to note when Swift implements object archiving To inherit nscoding, implement two methods Extension is a classification, the classification does not allow storage capacity, so the protocol method can not be