Ii. Common Singleton (continuous update) in iOS development and ios development

Ii. Common Singleton (continuous update) in iOS development and ios development

1. UIApplication (application instance)

Obtaining method: [UIApplication sharedApplication]

Detailed: http://www.cnblogs.com/hissia/p/5678518.html

 

2. nsicationicationcenter (message center)

Obtaining method: [nsicationicationcenter defacenter center]

Common notification Modes

 

3. NSFileManager (File Management)

Obtaining method: [NSFileManager defamanager manager]

 

4. NSUserDefaults (preference settings)

Obtaining method: [NSUserDefaults standardUserDefaults]

Detailed: http://www.cnblogs.com/hissia/p/5642405.html

 

5. NSURLCache (request cache)

Obtaining method: [NSURLCache sharedURLCache]

 

6. NSHTTPCookieStorage (Application cookie pool)

Obtaining method: [NSHTTPCookieStorage sharedHTTPCookieStorage]

 

7. NSURLSession (used when sending a request)

Obtaining method: [NSURLSession sharedSession]

 

8. UIMenuController (you can select, copy, cut, and paste the pop-up menu)

Obtaining method: [UIMenuController sharedMenuController]

Detailed: http://www.cnblogs.com/hissia/p/5668513.html