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How Do I Declare A Block in Obje

How Do I Declare A Block in Obje

作者: Mr_Baymax | 来源:发表于2016-11-23 19:31 被阅读17次

    As a local variable:

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

    As a property:

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

    As a method parameter:

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

    As an argument to a method call:

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

    As a typedef:

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

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