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@interface ViewController ()
//活動指示器
@property (nonatomic, strong) UIActivityIndicatorView *activityIndicatorView;
@end

/**
 UIActivityIndicatorView Demo
 */
- (void) activityIndicatorDome{
    //類型三種Lager White、White、Gray
    self.activityIndicatorView = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
    //set location
    CGRect frame = self.activityIndicatorView.frame;
    frame.origin = CGPointMake(140, 100);
    self.activityIndicatorView.frame = frame;
    
    //Animating 當運行時控件處于活動狀態
    //Hides When Stopped 控件處于非活動狀態時隱藏
    self.activityIndicatorView.hidesWhenStopped = false;
    
    //add
    [self.view addSubview:self.activityIndicatorView];
    
    
    //定義一個控制按鈕
    UIButton *buttonUpload = [[UIButton alloc] initWithFrame:CGRectMake(130, 140, 120, 45)];
    buttonUpload.backgroundColor = [UIColor grayColor];
    buttonUpload.layer.cornerRadius = 10;
    [buttonUpload setTitle:@"Upload" forState:UIControlStateNormal];
    [buttonUpload addTarget:self action:@selector(startToMove:) forControlEvents:UIControlEventTouchUpInside];
    
    [self.view addSubview:buttonUpload];
    
}
- (void)startToMove:(id)sender{
    NSLog(@"%s", __func__);
    if ([self.activityIndicatorView isAnimating]) {
        [self.activityIndicatorView stopAnimating];
    }else{
        [self.activityIndicatorView startAnimating];
    }
}