Understanding of release "not available" in Xcode4.2

Automatic Reference Counting (ARC) is a compilation-level feature used to develop Cocoa programs for Automatic memory management. 1: In XCode 4.2, create a project using the template, which will use the "ARC feature" by default. 2: You can select

Introduction to visual controllers and views in CoCoa Programming

UITabBarController class The option card class allows you to move between multiple view controllers and customize this column at the bottom of the screen. Provide one-click access to different views, and provide the More button to the screen

Ios camera/album to get images, compress images, and upload server method summary

I have been developing an application on the iphone over the past few days. There are problems that require camera/album programming and Image Upload. Here I will summarize them. [Partial knowledge] Images on the iphone are usually stored in four

Comprehensive parsing of UITextField in iOS

// Initialize textfield and set the position and sizeUITextField * text = [[UITextField alloc] initWithFrame: CGRectMake (20, 20,130, 30)]; // set the border style. The border style text is displayed only when it is set. borderStyle = custom;

Ios graphics and plotting

1. ios provides two high-quality graphics rendering Methods: a. OpenGL ES for rendering B. Quartz, Core Animation, and UIKit for rendering 2. the OpenGL ES framework is mainly applicable to game or high frame rate application development. The C

Simple use of iphone Regular Expressions

After 4.0, the system has its own class (NSRegularExpression, NSRegularExpression) to use regular expressions. Previously, it was used to add a third-party class library RegexKitLite. Simple use of these two classes: NSString * str = @ "3sdfh * odsi

Custom CheckBox control developed for IOS

IOS does not have the system's CheckBox component, but it is often used in actual development. Therefore, a CheckBox control is specially written and the code is directly written. : The UICheckBoxButton. h file is as follows: # Import # Import

Prevent iphone from entering sleep background to play music

Step 1: find info. plist of the project in the resource folder and addArray of Required background modesAnd add an element below, whose value isApp plays audio Step 2: You need to import the corresponding framework and header files.# Import # Import

IOS memory optimization and debugging skills

Basic 1: image memory size Summary A: Images: Large Memory users, especially mobile game image resources. Computing the usage of image resources in memory has become a frequent task for developers of j2s games. CoCoMo explains how to calculate the

How to view PNG images optimized by iOS

For iOS apps, xcode optimizes PNG files so that image preview cannot be displayed. So how can we view these optimized files? The optimization is completed by the pngcrush tool. You can find it in xcode. Pngcrush supports command line options-revert-

Add a dynamic hide button to the iOS virtual keyboard

If you want to add a button on the keyboard, you can change the button Location Based on the keyboard height in real time. If you do not enter a button, you can click it to hide the keyboard. This method is embodied in many software applications,

Iphone image stretching Methods

After ios6, the image stretching method has been extended to three functions: 1. Methods provided by ios4: -(UIImage *) stretchableImageWithLeftCapWidth :( NSInteger) leftCapWidth topCapHeight :( NSInteger) topCapHeight This function is an instance

Ios code controls the shadow of controls

You only need to overwrite the corresponding space. I developed the UIButton control. . H file, as follows: # Import # Import @ Interface ShadowButton: UIButton { UIColor * shadowColor; } @ Property (nonatomic, strong) UIColor * shadowColor; @

IOS dynamically changes cell height

# Import "ViewController. h" @ Interface ViewController (){UITableView * _ table;NSMutableArray * _ dataList;UIView * footView;}@ End @ Implementation ViewController -(Void) viewDidLoad{[Super viewDidLoad];_ Table = [[UITableView alloc]

Basic memory management policy for iPhone Library

Basic memory management policy of the database Apple provides developers with a large number of libraries, including the following memory management policies. 1. If the object is created using the-initialization method, the object only adds 1 to

How to program multiple threads in iphone

  Multithreading is difficult in a variety of programming languages and is difficult to implement in many languages. Although objective-c originated from c, its multi-threaded programming is quite simple and comparable to java. This article briefly

Different presentation modes of Modal View Controller

ModalPresentationStyle: UIModalPresentationFullScreen: Full Screen mode, that is, the pop-up window occupies the entire screen, which is the same in portrait mode and landscape mode, UIModalPresentationFormSheet: the window is reduced so that it

Handling of iOS keyboard overwrite input boxes

On a multi-input interface, multiple UITextfield input boxes are displayed. In terms of scrolling, we will add them to the cell of UITableView one by one to form a data input interface that can slide up and down. However, the character input is

IOS Crash File Analysis Method

The location of symbolicatecrash in Xcode 4.3 is different from that in earlier versions. /Applications/Xcode. app/Contents/Developer/Platforms/iPhoneOS. platform/Developer/Library/PrivateFrameworks/DTDeviceKit.

Layout problems in IPad/IPhone Development

I initially learned how to develop IOS (IPad/IPhone). I spent a lot of time on the Interface layout in the past two days. There are two methods for IOS interface: 1. Create an Interface using Interface Builder and associate it with the

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