IOS

Event loop, qt event Loop   So what is an event loop? A typical graphic application often takes a long time to wait for user operations. The program remains idle until the person controlling the running of the program makes a decision very slowly (

In iOS, UIKit -- UIButton sets the border, uikituibutton UIButton * testButton = [UIButton buttonWithType: UIButtonTypeSystem]; [TestButton setFrame: CGRectMake (self. view. frame. size. width/2, self. view. frame. size.

NSBundle understanding and mainBundle class method explanation, nsbundlemainbundle Similar NSString *file = [[NSBundle mainBundle] pathForResource:name ofType:nil]; This code generates the full file path. So what is it: first look at the NSBundle

UIImagePickerController, SandboxUIImagePickerController1. + (BOOL) isSourceTypeAvailable :( UIImagePickerControllerSourceType) sourceType; check whether the specified source is available on the device. // Check whether the photo source is

IOS development, the system comes with the acquisition of facial expressions // Convert the number to # define EMOJI_CODE_TO_SYMBOL (x) (0x808080F0 | (x & 0x3F000)> 4) | (x & 0xFC0) -(Void) viewDidLoad {[super viewDidLoad]; // call int sym = EMOJI_

IOS version PM2.5 air quality monitorPreface In view of the popularity of Chai Jing's "under the sky", more people may be concerned about environmental, air quality and other environmental factors. Refer to the acquisition of PM2.5 from a Swift

Three ways to set AutoLayout-NSLayoutConstraint code, nslayoutconstraint AutoLayout is a new layout technology introduced by Apple to replace autoresizing from IOS 6. There are three ways to set AutoLayout. Let me explain it one by one. Before

KVO for IOS SDK   Preface: KVC and KVO are tools that help us navigate the dynamic features of objective C. KVO is based on KVC, so if you are not familiar with KVC, you can refer to my blog. Here I will not repeat KVC. Content of this article KVO

@ Class: What does a class mean?     Objective-C introduces the keyword @ class to tell the compiler: "This is a class, so I only need to reference it through pointers ". In this way, the compiler will "Calm down": it does not need more

IOS certificate, description file, and AppID. Recently, I have thoroughly reviewed the certificate-related and related procedures in iOS development, which are summarized as follows.   Developer account: You can add multiple sub-developers to the

IOS -- Singleton design mode in Swift developmentRecently, I have developed a small application and encountered some common Singleton modes in Objective-c, but there are some differences in swift, I tried to find out that I couldn't play the cards

IOS review notes 15: NSObjectTo facilitate the description, paste the following code: @interface Student:NSObject-(void)go;-(void)showName:(NSString *)name;-(void)introduce:(NSString *)name :(NSString*)address;@endStudent* stu = [[Student alloc]init]

Source code of ParseChat chat room application project, parsechat chat room ParseChat is a completely native iPhone application used to create real-time, text-based Parse chat rooms. Function: supports real-time chat between multiple devices,

Use of AlertView + Block, alertviewblock AlertView is frequently used. It seems that it is not so ugly After flattening, but so far, the official website still uses Delegate to handle click events, which affects the readability of the program. If

ShareSDKForANE packaging notes, sharesdkforane Packaging Recently I made a ShareSDK IOS access (ANE). Now I think it's actually very simple. However, due to my infamiliarity with Xcode, ANE has been around for a long time, licking your face and

Some pitfalls of iOS horizontal and vertical screen switching (continuous update), ios Switching Recently, I was working on a video App and encountered a video rolling playback problem, followed by the problem of horizontal and vertical screens. I

(IOS development advanced) Dry Goods Summary   10.1.3 do not send messages to released objects Some readers want to test whether the retainCount of an object is changed to 0 when it is released. Their test code is as follows: (remember to set it to

Ios archive learning notes Archive refers to the process of saving one or more objects in a certain format for future restoration of these objects. Archiving using xml Attribute lists If you archive NSString, NSDictionary, NSArray, NSData, and

IOS version information includes 6, 6 plus Import # import /*** IPhone device number **/ + (NSString *) iPhoneVersion { NSString * iPhoneVersion = nil; Size_t size; Sysctlbyname (hw. machine, NULL, & size, NULL, 0 ); Char * machine = (char *)

[IOS multithreading & Network, ios MultithreadingA. Basic XML knowledge1. What is xml?Extensible Markup Language"Like JSON, it is also a common data format for interaction.It is also called XML Document)XML example 2. xml syntax a common XML