IOS

The reference is automatically counted in the arc automatic reference counting memory management.Apple official documentation: uses the arc mechanism in oc to allow compilers to manage memory,In the next-generation apple llvm compiler, you do not

In map development applications, the use of geographical locations and MKMapView is inseparable. The following describes what you learned when using these two things. However, not all Apple devices support geographic locations. We should make a

For Xcode 5, click the Project Name> Build Settings> Search for ubuntures. The original value is Standard ubuntures (armv7, armv7s, arm64). Click this value, in the drop-down list box, select Standard ubuntures (armv7, armv7s), save the project, and

I encountered a problem during project development. I directly created a UIScrollerView ON THE UIViewController and added the UIScrollerView as a subview TO THE UIViewController, Another UISlider component is added to UIScrollerView. During the

Autorelase: You can assign an object to the automatic release pool. When the release pool is destroyed, perform a release operation on the object as follows: * Person = Note: when defining the method name, it starts with the class name, and the

Inter-Application Communication: 1. Learn about URL Schemes. URL Scheme is something like http: //, ftp: //. You can also customize URL Scheme for your own applications, other applications can access your application by using this identifier. If the

About NSURLSession upload and download After IOS7.0, Apple released a new NSURLSession to replace NSURLConnection. NSURLConnection is executed in the main thread by default. The NSURLSession is executed on other threads. This article mainly

    The memory of iOS devices is limited. If you use UITableView to display thousands of data records, If you need thousands of UITableViewCell objects, That will consume the memory of the iOS device. To solve this problem, you need to reuse the

    Number of columns-(NSInteger) pickerView :( UIPickerView *) pickerView numberOfRowsInComponent :( NSInteger) component {NSArray * array = _ foods [component]; return array. count;}-(NSString *) pickerView :( UIPickerView *) pickerView

. With the introduction of the following functions, you can easily shake the device when the tester encounters a BUG, and then automatically save it to the sandbox of the application. After saving it to the sandbox, you can customize a problem

The default Alignment Method created by UITextField through code is to align to the left and up, But we generally want to align vertically in the center. In UITextField, there is no attribute that can control alignment. It uses attributes inherited

1. Development Platform path: /Developer/Platforms There are generally three directories in this path: mac, simulator, and iphone. MacOSX.platform iPhoneSimulator.platformiPhoneOS.platform Each directory contains a/Developer/usr/bin directory,

This chapter first introduces UICollectionView and its common methods, and then combines an instance to learn how to use UICollectionView.   The UICollectionView and UICollectionViewController classes are newly introduced APIS of iOS6. They are used

1. desired effect: When you browse the article, when you slide down, the navigationBar and toolbar are hidden. When you reach the end, move up and the navigationBar and toolbar are displayed again. 2. Idea: first, webview is used to display the

      LineChartViewDemo. h   # Import @ Interface LineChartViewDemo: UIView // distance between the horizontal and vertical axes @ property (assign) NSInteger hInterval; @ property (assign) NSInteger vInterval; // display the label @ property (

This article is based on the most complete iOS DIY framework tutorial (I) in history. 1. Create a static library project: 2: Get your favorite name: 3. Delete the Target in the project generated by the Wizard: 3. Delete the project folder

Source: In batch production of analyst apps, the basic functions of this app are the same, but the application names, icons, and identities of different analysts are different (this unique identity is required to request data ). Solution: The

If you want to migrate your old iOS 6 app to iOS 7, you must pay attention to it. When your old app is running on iOS 7, all ViewController views are moved up as a whole, because iOS 7 sets the overall screen height (including the status bar and

Sometimes, if you want to run a piece of code after a certain period of time, you need to use delayed execution. There are several common methods: 1. The most direct method is performSelector: withObject: afterDelay: the disadvantage of this method:

N the apple sample code "SpeakHere" you can do some thing like this: AudioQueueNewInput ( & MRecordFormat, MyInputBufferHandler, This/* userData */, NULL/* run loop */, NULL/* run loop mode */, 0/* flags */, & mQueue) You can do some thing in