iphone - 滑动动画
我有一个 UIView，我想通过以下方式将其动画显示到屏幕上：
想象一下，您正在看一个桌面，并且有一个信封，在信封上方有一个盒子。该框几乎覆盖了整个信封，但您会看到一个没有被框覆盖的小信封边框。动画将是信封向下滑动，直到完全可见。
我可以简单地对此进行动画处理，但我必须在信封上有另一个带有框图像的视图，因此它将覆盖信封。我的想法是在没有此框视图的情况下进行此操作。如果我使用像 Photoshop 这样的应用程序来制作动画，我只需将遮罩（或蒙版）固定，并在我希望信封不可见的地方制作一个黑色矩形，即模拟它被盒子覆盖的情况。然后，如果我保持蒙版固定，我可以为图像设置动画，它会显示为来自框下方，但实际上它来自遮罩为黑色（图像不可见）的区域到伴侣是白色的（图像可见）。
在 iOS 上可以做到这一点吗？
我可以遮罩 UIImageView 或图层并为图层设置动画并保持其遮罩固定吗？
在此页面查看下滑效果 http://madrobby.github.com/scriptaculous/combination-effects-demo/
它会让你明白我的意思...
谢谢
I have a UIView that I would like to animate into the screen in the following way:
Imagine you are looking a table top and you have an envelop and over that envelop a box. The box covers almost all the envelop, but you see a small envelop border that is not covered by the box. The animation would be the envelop sliding down until it is fully visible.
I could simple animate this, but I would have to have another view with the box image, over the envelop, so it will cover the envelop. My idea is to make this without this box view. If I was using an application like Photoshop to animate this, I would simply make the matte (or mask) fixed and make a black rectangle where I want the envelop to be invisible, that is, to simulate as it was covered by the box. Then, if I keep the mask fixed, I can animate the image and it will appear as it is coming from below the box, but in fact it is coming from a region where the matte is black (image is invisible) to a region where the mate is white (image is visible).
Is it possible to do this on iOS?
Can I mask a UIImageView or layer and animate the layer keeping its mask fixed?
Check the slide down effect here in this page
http://madrobby.github.com/scriptaculous/combination-effects-demo/
It will give you and idea of what I mean...
thanks
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将“遮罩视图”的
clipsToBounds属性设置为YES。将“内容视图”作为子视图添加到“蒙版视图”中，并对“内容视图”的框架进行动画处理，使其滑入蒙版中。Set the
clipsToBounds-property of the 'mask view' toYES. Add your 'content view' as subview to the 'mask view' and animate the frame of the 'content view' so that it slides into the mask.