Swift

In previous small video recording articles, we used avassetexportsession to compress the merged video output into a final video file. High-quality compression (avassetexportpresethighestquality) was used at that time. Let exporter =

1, to get the first day of the current month, the last day date This month's start dateFunc startofcurrentmonth ()-> nsdate {Let date = NSDate ()Let calendar = Nscalendar.currentcalendar ()Let components = Calendar.components ([. Year,. Month],

GZIP is a very popular data compression format for use on the Internet, or a file format. Using GZIP to reduce storage space, and then transfer files over the network, you can reduce the transmission time.Large-flow Web sites often use the gzip

In order to save traffic, we need to package them into zip files for transmission, or unzip the downloaded zip package. This article describes how to use ziparchive for file compression, decompression operations. 1,ssziparchive Introduction

Sometimes we need to flip the picture (uiimage) vertically (upside down) or flip it horizontally (that is, mirroring). The following figure: There are usually two ways. Method One, changing the direction of the picture 1, the

The following describes how to use the Third-party library Rebekka for FTP client development, the implementation of the features include: FTP server connection, file list query, folder creation, upload files, download files. Description and

1,OPENCV Introduction OpenCV's full name is: Open Source Computer Vision Library. It is an open source Cross-platform Computer Vision Library, which realizes many common algorithms in image processing and computer vision. Its

Bilibili (b station), presumably everyone is not unfamiliar. The Ijkplayer framework is the B station provides an open source streaming media solution, integrates ffmpeg, and also supports hard decoding (requires iOS8 above version). Using the

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

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,

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 () {         super. Viewdidload ()                    //create date selector         

Use Sample 1 2 3 4 5 6 7 8 9 import  uikit   class  viewcontroller:  UIVIEWC ontroller  {       @IBOutlet   weak  var  imageview:  Uiimageview! & nbsp;          override  func  viewdidload () {          super. Viewdidload ()                          

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

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

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 () {         super. Viewdidload ()           

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

Using 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? // call this closure Self.returnprice?

Optional type (? ) with the Force parsing operator (!)? is a kind of judgment after unpacking the grammar sugar!  is a forced unpacking syntax sugar when you're not sure you have a value, you can use it. You can use it when you're sure you have a

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 name.Note: In the method, the second and subsequent parameters, the default is

Adding 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, and the extension may add attributes, methods, subscripts, and constructors