IOS

In-depth understanding of iPhone screen dual-buffering technology (iphone development-basics) Author: Sun Dongfeng (source)   In the development of recent projects, I need to use the "dual-screen buffer" technology. "dual-screen buffer" is the most

1. If you want to process an image in a program (to obtain a part of an image), you can use the following code: UIImage * image = [UIImage imageNamed: filename]; CGImageRef imageRef = image. CGImage; CGRect rect = CGRectMake (origin. x, origin. y,

UIView * view = [[[[UIApplication sharedApplication] windows] objectAtIndex: 1] subviews] lastObject]; // obtain a subView of a window NSInteger index = 0; // used to name the saved pngFor (UIView * subView in [view subviews]) {// traverses the

    After Xcode4 is started, a welcome window is displayed. Click "Create a new Xcode project" to Create a project. You can also create a new project by using the menu or shortcut. Select a new project template Xcode4 provides several project

  Objective-C has three Dynamic Features   1. Dynamic type Dynamic typing-determining the class of an object at runtime The object type is determined during running.   2. dynamic binding Dynamic binding-determining the method to invoke at

To do well, you must first sharpen your tools. When developing iPhone applications, it is important to have a deep understanding of iPhone OS/SDK and Objective-C 2.0. IPhone OSThe iPhone OS consists of four main parts. The following is a simple list

  I wrote an article a few days ago: Get the current date and time and display it in LCD format. According to the practice of this article, the time is displayed horizontally, similar to the following:     What should I do if I want to display

  In iPhone development, we often need to perform animation switching between different pages, which looks better. There are three basic animations: 1. UIView UIView provides five official animation effects for you: UIViewAnimationTransitionNone

Andy-original breeze. For more information, see. Thank you. 1. UITableView Initialization   UITableView tableview = [[UITableView alloc] initWithFrame: CGRectMake (0, 0,320,420)]; [Tableview setDelegate: self]; [Tableview setDataSource: self]; [Self.

+ (UIImage *) getImage :( NSString *) videoURL{NSDictionary * opts = [NSDictionary dictionaryWithObject: [NSNumber numberWithBool: NO] forKey: AVURLAssetPreferPreciseDurationAndTimingKey]; NSURL * url = [[NSURL alloc] initFileURLWithPath: videoURL]

-(Void) viewDidLoad {[Super viewDidLoad];FlakeImage = [UIImage imageNamed: @ "flake.png"];[NSTimer scheduledTimerWithTimeInterval :( 0.05) target: self selector: @ selector (play) userInfo: nil repeats: YES];} -(BOOL)

Obtaining screen resolution is a very useful function. In some game-related development, drawing and screen resolution are inseparable. Obtaining the resolution of the current screen is essential.Two steps are allowed to obtain the screen resolution.

IOS provides support for previewing files using other apps. This is Document Interaction Controller. In addition, iOS supports file association, allowing other programs to call your app to open a file. In addition, starting from 4.2, Quick Look

1. Create a single view application iOS application project named CustomView. For example, we do not add any controls to customviewcontroller. xib:2. Create a CustomView. xib. The procedure is as follows:Drag a label and a button to the

The xml string is:   // Parse button event -(IBAction) btnXml { NSString * str = [uitextview1 text]; // Convert string to data NSData * xmlData = [str dataUsingEncoding: NSUTF8StringEncoding]; // NSXMLParser class is required for xml parsing.

Today we are mainly talking about the basis of C. This time we will mainly explain it in detail by code.First of all, the biggest headache is the difference between a = I ++ and a = ++ I. a = I ++ first assigns a value and then increases itself, a =

1. After synchronizing the application, find the log file you want to view. The log file corresponds to the mac location and xp \ vista location.2. I found that log files are not readable in hexadecimal notation. How can I convert them into what we

This document describes how to use the NSUserDefaults class to store and change application settings. We will create a Contact application to store user-specified images and Contact information. What is NSUserDefaults?The NSUserDefaults class is

In the project, I want the page Jump to have different animation effects. I am a person who likes to submit public code and write it as a Tool class. Of course, this will not happen. Well, check the Code:. H file:[Cpp]# Import # Import  @ Interface

What to do with custom View1. Initialization:-For the View created in the program, override initWithFrame initialization.-For views loaded in nib, override initWithCoder initialization.-After the nib file is loaded, you can use awakeFromNib to