Ios basics-XCode tips

(1) pragma mark

1. Definition

# The code starting with pragma is a compiler instruction, which is a program or compiler-specific instruction. Not necessarily applicable to other compilers or other environments. If the compiler cannot recognize this instruction, it will ignore it.

2. Role
At the top of the editor pane, separate the code from the function pop-up menu to standardize the code for easy reading and searching.

3. Use

Add # pragma mark-

# Pragma mark-when the view is to be displayed-(void) viewWillAppear :( BOOL) animated {// initializes the array of the selected number/* clears the selected betting ball group each time it is switched to rootview */DataModel * datamodel = [DataModel 1_datasource]; datamodel. bils = [[NSMutableArray alloc] init];}

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Successfully created. Drag the code snippet library to the bottom, modify the name, and add a shortcut key.

At this point, the creation is successful. If you enter pm in the class, a prompt is displayed.

Press enter to automatically complete

In addition, I have created three more quick operations.

Title: NSLog Completion Shortcut: log Completion Scopes: Function or Method   NSLog(@"<#Log#>");

Title: Property Strong Completion Shortcut: ps Completion Scopes: All   @property (strong, nonatomic) 

Title: Property Assign Completion Shortcut: pa Completion Scopes: All   @property (assign, nonatomic) 

Check the code snippet library, and there are also many frequently used quick operations, such as if, ifelse, dowhile, etc.