- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { NSLog(@"----touchesBegan"); static dispatch_once_t onceToken; dispatch_once(&onceToken, ^{ // NSLog(@"----once"); 只会打印一次 NSLog(@"----once"); }); }
时间: 2024-08-10 23:33:23
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { NSLog(@"----touchesBegan"); static dispatch_once_t onceToken; dispatch_once(&onceToken, ^{ // NSLog(@"----once"); 只会打印一次 NSLog(@"----once"); }); }