一个很“傻”的面试题
2019-07-30 本文已影响0人
NextStepPeng
请写出，下面的打印是？
dispatch_async(dispatch_get_global_queue(0, 0), ^{
NSLog(@"1");
[self performSelector:@selector(pintLog) withObject:nil afterDelay:0];
//[self performSelectorOnMainThread:@selector(pintLog) withObject:nil waitUntilDone:false];//
// [self performSelectorInBackground:@selector(pintLog) withObject:nil];//
NSLog(@"3");
});
- (void)pintLog{
NSLog(@"2");
}
