Swift 4

Picture size fit UIImage 1. Uiimageview by the picture shortest edge complete fills does not distort Bigimageview? Contentscalefactor =uiscreen.main.scale Bigimageview? Contentmode =uiviewcontentmode.scaleaspectfill Bigimageview? Autoresizingma

Swift String Common Method _swift Foundation

Refer to the Java String class for a summary of swift string usage. Basic article: 1, String length: 3 ways. let-str = "12345678" let len1 = strlen (str)//8 let len2 = Str.count //8 let len3 = (str as nsstring). Leng Th //8 2, string concatenatio

Swift 2

JSON primary parsing Known return data format var imagearr:nsmutablearray! var urlarr:nsmutablearray! { ' state ': true, ' body ': [ { ' cover ': '/images/push/201611/20161109093112_36.jpg ', ' ID ': 1,

Swift Syntax-Higher order function _swift Foundation

Higher-order function Map,flatmap,reduce,filter can simplify the amount of code, can be used. 1, the map function, is the set and the String class instance method, the function is the diachronic modification Item;map does not modify the instance val

Swift Grammar-where keyword detailed _swift basics

In swift syntax the WHERE keyword acts as a where in SQL, that is, additional conditional judgment. 1, in the collection traversal use where, if the condition is true, execute code block, false when not executing code block. Let array = [0, 1,

Swift 1

Cocoapods's use Podfile added: Platform:ios, ' 8.0 ' use_frameworks! Target "Longyantv" do Pod ' afnetworking ', ' ~> 3.1.0 ' end To create a bridging file using OC code 2. Click the project-->targets-->build settings to find Swift Compiler,

Swift-Usage of the Date selection control (Uidatepicker) basics

Pure code Creation Date Selection Control 1 2 3 4 5 6 7 8 9 (import  Uikit   CL-K-A-day) ass  Viewcontroller:  uiviewcontroller  {       override  func  Viewdidload () {   &nb

Swift-Add a picture watermark to a picture-base use

Use Sample 1 2 3 4 5 6 7 8 9 import  uikit   class  viewcontroller:  UIVIEWC ontroller  {       @IBOutlet   weak  var  imageview:  Uiimageview! & nbsp;    

Swift-Let the tab bar button uitabbaritem the picture centered (no text) _ Use

For the tab bar (Uitabbar), when the Tabbaritem does not need title as long as the image, the image below will occupy a space. We can set the offset by tabbaritem.imageinsets so that the image icon is centered. (Note: Top and bottom are set to the op

Swift-The use of the progress bar (Uiprogressview) _ Basic usage

1, create a progress bar 1 2 3 4 var progressview= uiprogressview (Progressviewstyle:uiprogressviewstyle. Default) progressview.center= self. View.center progressview.progress=0.5//Defaults progress 50% self. View.addsubview ( Progressview); 2, set t

Swift-use of segmented selection controls (Uisegmentedcontrol)-Basic usage

1, select the control's creation and listen for the control selection value 1 2 3 4 5 6 7 8 9 import  uikit   class  V Iewcontroller:  uiviewcontroller  {       override  func  viewdidload (

IOS Swift Project IM implementation, from long connection to data stream parsing socket

IOS Swift Project IM implementation, from long-connect to the underlying data analysis socket A: Project introduction: Last year began to take over a state-owned enterprise mobile project, the demand for the project is to achieve im Instant

[Swift Development] using a closed packet value (Typealias)

Tags: let float block oar tle style with Var nilUsing closures in swift to achieve the value of two interfacesFor example, there are Class A and Class B.Class B// declare closed packet typealias valueblock = (Float)---Var returnprice:valueblock? //

In Swift? And! The difference

Tags: the difference of div method option declares type to judge a forced operationOptional type (? ) with the Force parsing operator (!)? is a kind of judgment after unpacking the grammar sugar!  is a forced unpacking syntax sugar when

Use of "#" in Swift

Tags: round result amount NTB BER call function without font mount Configure external parameter names Add "#" to the parameter name of the function (or method) before it can have the same local parameter name and external parameter

Swift Custom view VFL setting constraint violation

Tags: ble display custom order Col Swift ack Delete interface1. Added a custom view,view on the TableView cell with rounded corners, gradients,The Modify button and delete button are displayed when the number is 0, and when the model copy is changed

Swift Learning 21:? And! Detailed

Tags: blog http color using IO strong for ARThe swift language uses VAR to define variables, but unlike other languages, Swift does not automatically assign initial values to variables.This means that the variable does not have a default value, so

Swift Learning-25--Protocol 02

Tags: your own implementation-based selection parameter type ASA example castAdding protocol consistency through extensionsEven if the source code cannot be modified, the extension can be used to follow the existing type and conform to the Protocol,

Swift Learning-03--Basic operator

Tags: expression method initialize first compound Var make up ternary operator noteOperators are special symbols or phrases that check, change, merge values,Swift supports most of the standard C-language operators and improves many features to

Learn Swift notes starting from 0 (i)

Tags: data structure way Tor cappuccino his rect ASE mic operationSwift is a new programming language for IOS and OS X apps, built on the best C and Objective-c languages, without the C language compatibility restrictions. Swift uses a secure

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