【简单常用】转圈圈，

- (void)viewDidLoad

{

    [superviewDidLoad];

    

    

    _activityIndicator = [[UIActivityIndicatorViewalloc] initWithFrame:CGRectMake(0.0f,0.0f, 32.0f, 32.0f)];

    [_activityIndicatorsetCenter:self.view.center];

    [_activityIndicatorsetActivityIndicatorViewStyle:UIActivityIndicatorViewStyleGray];

    [self.viewaddSubview:_activityIndicator];

    

    

    UIButton*bt=[[UIButtonalloc]initWithFrame:CGRectMake(111,111, 111, 111)];

    bt.backgroundColor=[UIColorredColor];

    [bt addTarget:selfaction:@selector(zzz)forControlEvents:UIControlEventTouchUpInside];

    

    [self.viewaddSubview:bt];

    

    

    

}

-(void)zzz

{

    [_activityIndicatorstartAnimating];

}