IOS

I. Thread creation:Operation objectis may create threads faster. For details, refer to: iOS core system programming best practices: concurrency.1. Thread creation requires a large amount of memory and time consumption. Therefore, we recommend that

The CategoryCategory mode is used to add methods to existing classes to expand existing classes. In many cases, Category is a better choice than creating a subclass. The newly added method will also be automatically inherited by all subclasses of

Use UILabel to display static text to show users static text and control the font and color of text. @ Property (nonatomic, strong) UILabel * myLabel; @ synthesize myLabel;-(void) viewDidLoad {[super viewDidLoad]; self. view. backgroundColor =

In the process of image processing, we often encounter image scaling requirements. In the past, we used a pinch gesture to scale the Image view, below is a brief introduction to the image scaling function provided by scrollView: first, implement the

1. determine whether an element BOOLisValue = [keyArray containsObject: Q "aaa"] exists in the array. 2. Separate the strings by commas and save them to the array: NSArray * keyArray = [[NSArray alloc] init]; keyArray = [@ "winter melon, watermelon,

3. MapView-click the city button. A list of available cities is displayed, but it is not reflected when you click the city button. There are no warnings or errors in the program. How can I find this problem? The best way is to use the logic

Problem description: Save the json parsing result in nsdictionary:   [Plain]{"StatusCode": "200 ","Body ":[{"Status": "success ","Remarks": null}], "Data ":["Abcd ":[{"Category": "","Title": "B ","Id": "24"},{"Category": "c ","Title": "crd ","Id": "6

1 PrefaceUIDatePicker is a class that is very similar to UIPickerView and is very common. Let's take a look at it today. 2 UIDatePicker IntroductionCode onDate selection:. H file:[Plain]@ Property (nonatomic, strong) UIDatePicker * myDatePicker; @

1 PrefaceToday, we will learn how to create a rotating affine transform and use the UIView animation method to perform the rotating action. 2. code exampleZYViewController. m   [Plain]-(Void) viewDidLoad{[Super viewDidLoad];UIImage * xcodeImage =

I. Thread Synchronization The thread synchronization method is similar to that in other systems. We can use atomic operations, mutex, lock, and so on. IOS atomic operation functions start with OSAtomic, such as OSAtomicAdd32 and OSAtomicOr32. These

Recently, I made a function for IOS program. If the image is displayed locally, I downloaded it online and stored it. After finding the information on the Internet, I realized the function based on my own understanding. The following describes the

AirPlay is not a new thing. It exists in the iOS 4.3 SDK. However, new things are constantly added to the AirPlay API. An interesting new feature is that the iPad program can play content from iOS devices or mirror the Screen Content on iPad 2

1. Implement the UItextFieldDelegate protocol in the Declaration File 2. Remove the keyboard in the UItextFieldDelegate protocol in the implementation file: -(BOOL) textFieldShouldReturn :( UITextField *) textField { [TextField

If you want to call a method of a class, you can write this method from the NSObject class.   C code example mselector:PerformSelector: withObject:PerformSelector: withObject: Actual call   C code [self defined mselector: @ selector (displayViews)

Target IOS development framework Common IOS design modes IOS Program Status IOS app lifecycle-UIApplication IBOutlet IBAction in IOS development Use of the IOS text box and its proxy class   1. IOS development framework What is a development

Description: ASIHttpRequest is a method used to apply a third-party library. It uses code quickly to reduce the amount of code and improve efficiency. preparation: I. Import a third-party library ASIHttpRequest 2. Many errors will be reported for

Basic Principles of Memory ManagementThe basic principles of memory management are as follows: The self-generated object is the ownerAn object generated by yourself can also be its owner (an object can be held by multiple people)If you do not want

This event is triggered when you click the background, jump to the interface, or generate other responses. -(Void) viewDidLoad { UIImageView * imageView = [UIImageView alloc] initWithFrame: CGRectmake (200,100,)]; ImageView. image = [UIImage

  Anyone who has worked on mobile development knows that list controls are one of the most commonly used controls. The list control in iOS is UITableView. In fact, Apple developers are well-designed for UITableView (easy to use and highly scalable ).

  To save traffic and improve user experience, many applications currently use the local cache mechanism. Among them, Netease news provides the best caching function. My own applications also want to add the local cache function, so I checked the