Multi-Threading implementation in iOS _04_block

Block 1, block definition

is to prepare a snippet of code to execute when needed

Note:block is the C language format

2. Block format

Format: return type (^blockname) (parameter type) = ^ (formal parameter list) {code implementation};

Tip: If there are no parameters, the format can be simplified

Format: return type (^blockname) () = ^ {Code implementation};

Enter Inlineblockin Xcode, prompt, this is the block format shortcut

3. Sample Code

(1) First look at how block is used

    void (^myblock) () = ^ {        NSLog (@ "Hello block");    };         // Call Block    Myblock ();

The output is: Hello block

(2) with parameters

    void (^sumblock) (intint) = ^ (intint  y) {        NSLog (@ "%d" ) , x + y);    };        Sumblock (ten);

Output is: 30

Multi-Threading implementation in iOS _04_block