20

关于转换的一些我不明白的事情。我想放大说 UIView（主视图）的右上角。我使用CGAffineTransformScale并尝试过设置中心/锚点，CGAffineTransformMakeTranslation但无济于事。

我不知道如何正确设置翻译，以便放大这一点。

CGAffineTransform tr = CGAffineTransformScale(self.view.transform, 2, 2);

[UIView animateWithDuration:2.5 delay:0 options:0 animations:^{
            self.view.transform = tr;
            self.view.center = CGPointMake(480,0);

} completion:^(BOOL finished) {}];
4

2 回答 2

34

您正在将视图的中心设置为右上角。这意味着您正在放大中心左下方的某个位置。

试试这个

CGAffineTransform tr = CGAffineTransformScale(self.view.transform, 2, 2);
CGFloat h = self.view.frame.size.height;
[UIView animateWithDuration:2.5 delay:0 options:0 animations:^{
    self.view.transform = tr;
    self.view.center = CGPointMake(0,h);
} completion:^(BOOL finished) {}];

这会将放大视图的中心设置为左下角，有效地放大并固定右上角。

此代码没有硬编码高度，它更便于携带（对于 iPhone 5 的 iPad）。

您需要h在设置transform属性之前先保存，因为之后您不应该依赖frame.

编辑

要使其适用于任何规模s，请使用以下命令：

CGFloat s = 3;
CGAffineTransform tr = CGAffineTransformScale(self.view.transform, s, s);
CGFloat h = self.view.frame.size.height;
CGFloat w = self.view.frame.size.width;
[UIView animateWithDuration:2.5 delay:0 options:0 animations:^{
    self.view.transform = tr;
    self.view.center = CGPointMake(w-w*s/2,h*s/2);
} completion:^(BOOL finished) {}];

要使其适用于左下角，请使用以下命令：

CGFloat s = 3;
CGAffineTransform tr = CGAffineTransformScale(self.view.transform, s, s);
CGFloat h = self.view.frame.size.height;
CGFloat w = self.view.frame.size.width;
[UIView animateWithDuration:2.5 delay:0 options:0 animations:^{
    self.view.transform = tr;
    self.view.center = CGPointMake(w*s/2,h-h*s/2);
} completion:^(BOOL finished) {}];

要使其适用于右下角，请使用以下命令：

CGFloat s = 3;
CGAffineTransform tr = CGAffineTransformScale(self.view.transform, s, s);
CGFloat h = self.view.frame.size.height;
CGFloat w = self.view.frame.size.width;
[UIView animateWithDuration:2.5 delay:0 options:0 animations:^{
    self.view.transform = tr;
    self.view.center = CGPointMake(w-w*s/2,h-h*s/2);
} completion:^(BOOL finished) {}];

另请参阅：如何将 UIView 缩放（缩放）到给定的 CGPoint

于 2011-03-27T03:05:30.043 回答
3

如果有人仍然感兴趣，这里是 Swift 3.0 解决方案，我添加了正确淡出的可能性。

（我知道缺少两个枚举，但代码仍然可读，我想你会明白这个概念）

func animateZoom(direction: ZoomDirection, type: ZoomType, duration: Double = 0.3, scale: CGFloat = 1.4) {
    var cx, cy: CGFloat
    var tr: CGAffineTransform = CGAffineTransform.identity

    if (type == .IN) { tr = self.transform.scaledBy(x: scale, y: scale) }

    let h: CGFloat = self.frame.size.height;
    let w: CGFloat = self.frame.size.width;

    if (type == .IN) {
        switch direction {
        case .LEFT_DOWN:
            cx = w*scale/2
            cy = h-h*scale/2
            break
        case .LEFT_UP:
            cx = w*scale/2
            cy = h*scale/2
            break
        case .RIGHT_UP:
            cx = w-w*scale/2
            cy = h*scale/2
            break
        case .RIGHT_DOWN:
            cx = w-w*scale/2
            cy = h-h*scale/2
            break
        }
    } else {
        cx = w/scale/2
        cy = h/scale/2
    }

    UIView.animate(withDuration: duration, delay: 0, options: [.curveEaseInOut], animations: {
        self.transform = tr
        self.center = CGPoint(x: cx, y: cy)
    }, completion: { finish in })
}
于 2016-11-08T21:40:22.113 回答