UIView缩放动画

UIView *singleMapView = [[UIView alloc]initWithFrame:CGRectMake(10, 150, 300, 250)];
    singleMapView.backgroundColor = [UIColor blackColor];
    [self.view addSubview:singleMapView];
    
    singleMapView.transform = CGAffineTransformMakeScale(1, 1);
    
    [UIView animateWithDuration:3 animations:^{
        singleMapView.transform = CGAffineTransformMakeScale(1.2, 1.2);
    }completion:^(BOOL finish){
        [UIView animateWithDuration:3 animations:^{
            singleMapView.transform = CGAffineTransformMakeScale(1, 1);
        }];
    }];