iOS實(shí)現(xiàn)代碼只讓執(zhí)行一次
- (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view, typically from a nib. [self performSelector:@selector(wangmumu:) withObject:@"100" afterDelay:1];} - (void) wangmumu:(NSString *)han{ static dispatch_once_t hanwanjie;//只執(zhí)行一次 dispatch_once(&hanwanjie, ^{ NSLog(@"12345678910"); }); int niha = [han intValue] - 1; if (niha == 10) { return; } [self performSelector:@selector(hanwanjie:) withObject:[NSString stringWithFormat:@"%d",niha] afterDelay:1];} 
