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iOS block

分类: IT文章 • 2022-04-12 10:29:25

定义：

returnType (^funcName)(paramType paraName) = ^(paramType paraName){};

作为方法参数时：

- (void)fun:( returnType (^funcName)(paramType paraName) ) blockName{}

typedef:

typedef returnType (^funcName)(paramType paraName);

防止block发生循环引用：

__weak __typeof(self) weakSelf = self;

AController *vc = [[AController alloc] initWithCallback:^{

[weakSelf.button setTitleColor:[UIColor greenColor] forState:UIControlStateNormal];

}];