How Do I Declare A Block in Objective-C?
As a local variable:
1.
returnType (^blockName)(parameterTypes) = ^returnType(parameters) {...};
2.
@property (nonatomic, copy) returnType (^blockName)(parameterTypes);
3.
- (void)someMethodThatTakesABlock:(returnType (^)(parameterTypes))blockName;
4.
[someObject someMethodThatTakesABlock:^returnType (parameters) {...}];
5.
typedef returnType (^TypeName)(parameterTypes);
TypeName blockName = ^returnType(parameters) {...};
block语法
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转载自wfkbyni.iteye.com/blog/2263342
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