动画增大/减小大小图像查看 iOS

Question

我正在尝试使用CGAffineTransformMakeScale对自定义按钮进行动画处理，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;
    }];
}   

按钮完美地增长到原始大小，但是，我不知道原因，但是当我单击按钮减小它时，它从比原始大小大 100% 的大小减小到原始大小，而不是开始减小原始大小并实现我在代码中指示的 0.01 的比例。

请帮忙！！

Answer 1

您可以使用以下代码对图像视图的大小进行动画处理

[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);    
    }];
}];

这将使图像视图最初减小大小，当动画结束时，它将通过动画恢复到其原始大小。

Answer 2

SWIFT 3 版本

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)
    })
})