记录有用的代码片段

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记录有用的代码片段

file2

it is a test file.

Block 使用方式

How Do I Declare A Block in Objective-C?

• As a local variable:

returnType (^blockName)(parameterTypes) = ^returnType(parameters) {...};

• As a property:

@property (nonatomic, copy) returnType (^blockName)(parameterTypes);

• As a method parameter:

- (void)someMethodThatTakesABlock:(returnType (^)(parameterTypes))blockName;

• As an argument to a method call:

[someObject someMethodThatTakesABlock:^returnType (parameters) {...}];

• As a typedef:

typedef returnType (^TypeName)(parameterTypes);
TypeName blockName = ^returnType(parameters) {...};

URL:
http://goshdarnblocksyntax.com/