iOS实现代码只执行一次

ios实现代码只让执行一次

- (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;
//只执行一次
  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];
}