設置動畫，旋轉

   CGRect frame = self.imageView.frame;

    // 創建臨時的圖片，保留原圖。一定要<span style="font-family: Menlo; font-size: 18px; color: rgb(187, 44, 162);">self</span><span style="font-family: Menlo; font-size: 18px;">.</span><span style="font-family: Menlo; font-size: 18px; color: rgb(79, 129, 135);">imageView</span><span style="font-family: Menlo; font-size: 18px;">.</span><span style="color: rgb(112, 61, 170); font-family: Menlo; font-size: 18px;">userInteractionEnabled</span><span style="font-family: Menlo; font-size: 18px;"> = </span><span style="font-family: Menlo; font-size: 18px; color: rgb(187, 44, 162);">YES</span><span style="font-family: Menlo; font-size: 18px;">;</span><div><span style="color: #000000">
</span></div>
    UIImageView* tempImageView = [[UIImageView alloc]initWithFrame:frame];
    tempImageView.image = [UIImage imageNamed:@"1.jpg"];
    [self.view addSubview:tempImageView];

    // 縮小
    CGAffineTransform transform = CGAffineTransformMakeScale(0.1, 0.1);

    // 順時針旋轉，這裏有位置變化，還沒有想到在這個過程中旋轉2周，現在是右轉約半周
    transform = CGAffineTransformRotate(transform, M_PI*1.99/2);

    // 設置目的地爲右下角
    CGPoint center = CGPointMake(self.view.bounds.size.width, self.view.bounds.size.height);
    [UIView animateWithDuration:2 delay:0 usingSpringWithDamping:1 initialSpringVelocity:3 options:0 animations:^{
        tempImageView.transform = transform;
        tempImageView.center = center;
    } completion:^(BOOL finished){
        [tempImageView removeFromSuperview];
    }];