shiios的博客

typedef void(^GHBlock)(void); 底层源码 typedef void(*GHBlock)(void); struct __main_block_impl_0 { struct __block_impl impl; struct __main_block_desc_0* Desc; GHPerson *person; __main_block_impl_0(void *fp, struct __main_block_desc_0 *desc, GHPerso

MRC环境下： 使用__block会使得底层将变量或者下面的person对象先包装成一个对象。 源码 typedef void(^GHBlock)(void); __block GHPerson *person = [[GHPerson alloc]init]; GHBlock block = ^{ NSLog(@"%p",person); };

int age = 10; int main(int argc, const char * argv[]) { @autoreleasepool { // insert code here... int a = 100; NSLog(@"数据段：age %p",&age); //数据段：age 0x100008208 NSLog(@"栈：a %p",&a); //栈：a 0x7ffeefbff41c

void(^block)(void) = ^{ NSLog(@"Hello"); }; NSLog(@"%@",[block class]); //__NSGlobalBlock__ NSLog(@"%@",[[block class] superclass]); //NSBlock NSLog(@"%@",[[[block class] superclass] superclass]);//NSObject