objective-c block

Posted 2020-10-04 阮減显

void foo(int (^blkParam)()){
    NSLog(@"foo param %d",blkParam());
}

void run()
{
    //定义 返回值类型 (^block的名称)(参数类型) = ^返回值类型(参数) {...};
    void (^blk)(void) = ^{
        NSLog(@"aaaaa");
    };
    //调用
    blk();
    
    //定义和调用一起
    int aa = ^(NSString *var){
        NSLog(@"sssss %@",var);
        return 88;
    }(@"trrrr");
    
    NSLog(@"aaa = %d",aa);
    
    
    int (^blk1)(void) = ^{
        NSLog(@"bbbbb");
        return 88888;
    };
    //作为参数,先定义
    foo(blk1);
    //作为参数,不先定义，直接写
    foo(^{NSLog(@"ddddd");return 9999;});
    
    
}



int main(int argc, const char * argv[]) {
    @autoreleasepool {
        // insert code here...
        NSLog(@"Hello, World!");
        //function_1(29,22.3);
        run();
    }
    return 0;
}