Objective-C Block 语法

Xcode

Objective-C

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

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

作为方法参数:- (void)someMethodThatTakesABlock:(returnType (^)(parameterTypes))blockName;

作为方法调用的参数：[someObject someMethodThatTakesABlock:^returnType (parameters) {...}];

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