这可能会很麻烦,所以我会使用 typedef,它可能看起来像这样
typedef void (^basicBlock)(void);
typedef void (^blockAcceptingBlock)(basicBlock);
然后
basicBlock block = ^ {
NSLog(@"Called from block passed as param");
};
blockAcceptingBlock parentBlock = ^(basicBlock childBlock) {
childBlock();
};
parentBlock(block);
如果没有 typedef,它在所有圆括号的定义中会有点嘈杂(请记住,这些是简单的块,因此显示的 defs 仍然相当可读)
void (^block)(void) = ^ {
NSLog(@"Called from block passed as param");
};
void (^parentBlock)(void (^childBlock)(void)) = ^(void (^childBlock)(void)) {
childBlock();
};
parentBlock(block);
两个输出
#=> 2012-04-27 11:39:12.798 Untitled[19725:707] Called from block passed as param