動畫增長/減小尺寸imageView iOS

Question

我正在嘗試使用CGAffineTransformMakeScale為自定義按鈕設置動畫，如下所示：

if (stateButton == 0) { //The button is gonna appear

    self.selected = YES;

    self.imageView.transform = CGAffineTransformMakeScale(0.01, 0.01);

    [UIView animateWithDuration:0.5 delay:0 options:UIViewAnimationOptionCurveEaseOut animations:^{
        // animate it to the identity transform (100% scale)
        self.imageView.transform = CGAffineTransformIdentity;
    } completion:nil];

}
else if (stateButton ==1) { //The button is gonna disappear


    self.imageView.transform = CGAffineTransformMakeScale(1, 1);

    [UIView animateWithDuration:0.5 delay:0 options:UIViewAnimationOptionCurveEaseOut animations:^{
        // decrease button
        self.imageView.transform = CGAffineTransformMakeScale(.01, .01);
    } completion:^(BOOL finished){

        self.selected = NO;
    }];
}   

按鈕完美地增長到原始尺寸，但是，我不知道原因，但是當我點擊按鈕減少它時，它從原始尺寸大於100％的尺寸減小到原始尺寸，而不是開始如我在代碼中所示，原始尺寸減小並達到0.01的標度。

請幫忙！！

Answer 1

您可以使用以下代碼為圖像視圖的增大和減小大小設置動畫

[UIView animateWithDuration:2.0 animations:^{
    self.imageView.transform = CGAffineTransformMakeScale(0.5, 0.5);
} 
completion:^(BOOL finished){
    [UIView animateWithDuration:2.0 animations:^{
        self.imageView.transform = CGAffineTransformMakeScale(1, 1);    
    }];
}];

這將使imageview最初尺寸減小，並且當動畫結束時，它將通過動畫恢復到其原始尺寸。

Answer 2

SWIFT 3版

UIView.animate(withDuration: 2.0, animations: {() -> Void in
    self.imageView?.transform = CGAffineTransform(scaleX: 0.5, y: 0.5)
}, completion: {(_ finished: Bool) -> Void in
    UIView.animate(withDuration: 2.0, animations: {() -> Void in
        self.imageView?.transform = CGAffineTransform(scaleX: 1, y: 1)
    })
})