IOS

I. Differences between processes and threads Processes and threads are the basic units for running programs that the operating system understands. The system uses this basic unit to realize the system's concurrency for applications. The difference

I have done an app about gif before, and I have never had time to record it. Now I want to record the learning process. Creating a gif is based on ImageIO. framework. Therefore, you must add this library first.   Gif decomposed Image     -(Void)

1. Image View // Find the image UIImage * pImage = [UIImage imageNamed: @ "sea.png"]; // Create an ImageView Based on the Content Image Self. pImageView = [[UIImageView alloc] initWithImage: pImage]; // Place the ImageView to the parent View [Self.

When I write the following code in ARC mode, the compiler reports an error.Semantic Issue: Property's synthesized getter follows Cocoa naming convention for returning 'owned 'objects @ Interface ViewController: UIViewController { NSString *

Gesture refers to all events that occur when you touch the screen with one or more fingers until all your fingers exit the screen. The UIGestureRecognizer is an object that knows how to observe user-generated event streams and recognize when users

Header file // Provides some factory methods for UI controls to implement initialization of some general controls # import @ Interface UIView (uifacloud) // Label + (id) createLabel; + (id) createLabel :( CGRect) frame; // TextField + (id)

We append four buttons to the toolbar, and call the goBack method, goForward method, reload method, and stopLoading method in sequence ., Basically, we can implement simple browser functions. The most important thing is to use the knowledge point of

      AFHTTPClient * AFHTTPRequestOperation * NSOperationQueue *// Display the download progress bar @ property (weak, nonatomic) IBOutlet UIProgressView *-(NSURL * url = [NSURL URLWithString: _ httpClient = _ queue =}  　　　　 Mark

1. No navigation controller or UITabBarController is packaged 1. When the Controller's view is UIScrollView \ UITableView \ UICollectionView (when the controller is UITableViewController) -(Void) viewDidLoad { [Super viewDidLoad]; // # Ifdef _

IOS7 app is in full screen mode by default, so the previous program window will move to the status bar, so there will be a white edge at the bottom side The table cell is a white background by default. The transparency effect previously set by the

When declaring object type attributes, you can solve the memory issue in setter (the old value of release and the new value of retain) and release the last retain in dealloc. Attribute is the memory of the object. Default type. The setter

Apache + PHP + MySQLNote:Sudo indicates that the command is executed with the administrator privilege to protect the system files from being damaged. Using sudo requires a password.I. vi shortcut keys. vi has two statuses: View status and edit

1. Execute the main function2. Run the UIApplicationMain function.1> Create a UIApplication object (UIApplication is a symbol of the entire program)An application has only one application object, and each application has its own application object.2>

  1. CGRect frame 1> indicates the position and size of the control (with the upper left corner of the parent control as the coordinate origin (0, 0 )) 2> modify this property to adjust the widget's position and size.   2. CGPoint center 1>

 -Add the data in the form of variable = value to the URL pointed to by the action, and use "?" Connection, and the variables are connected with "&"-insecure, because the data is stored in the requested URL during transmission-the amount of data

In iOS development:• Time-consuming operations, such as downloading network images, videos, songs, books, and other resources • using multithreading for playing audio in games: • giving full play to the advantages of multi-core processors and

There are two main ways to control the atomicity of thread synchronization/security. 1: NSCondition object 2: NSLock object The two locks are used in the same way. While (TRUE) {[lock]; // [_ ticketCondition lock]; if (numberOfTickets> 0)

Add a search bar to the table view to search for data in the table view. To create and initialize a table view, you must follow the UITableViewDataSource protocol and set two arrays. One is to store the data of the objects to be searched in the

Groups and partitions the table view to facilitate information search. First, you must create a. plist file that contains all the information to facilitate data entry during table view loading. Use dictionary storage to obtain table View data in

The internal status of the object is captured and embodied in the memorandum mode. In other words, it can save your things. Later, this external State can be restored without violating encapsulation; that is, private data is private. How to add the