xcode 如何旋转 UIImageView
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How to rotate a UIImageView
提问by Blane Townsend
I have a UIImageView that is an image of the star. The problem is I want the star to rotate when I move it. How can I rotate a UIImageView to make it look like it is spinning for 3 seconds. I want it to spin 720 degrees.
我有一个 UIImageView 是星星的图像。问题是我希望星星在移动时旋转。如何旋转 UIImageView 以使其看起来像是在旋转 3 秒。我想让它旋转 720 度。
回答by PengOne
For a very simple approach, you can use
对于一个非常简单的方法，您可以使用
imageView.transform = CGAffineTransformMakeRotation(radianRotation);
where radianRotationis a float, e.g. 4*pi for 720 degrees. You can play with basic animations and changing the rotation however you like.
哪里radianRotation是浮点数，例如 4*pi 表示 720 度。您可以玩基本的动画并根据需要更改旋转。
However, if you want a more sophisticated solution, then I highly recommend you look at the answers to this related post: how to rotate UIIMageVIew with fix point?
但是，如果您想要一个更复杂的解决方案，那么我强烈建议您查看此相关帖子的答案：如何使用固定点旋转 UIIMageVIew？
Also, see the myriad related posts linked on the right hand side of your screen. Many have all the code you need (barring going around in a circle twice).
此外，请参阅屏幕右侧链接的无数相关帖子。许多都有你需要的所有代码（除非绕圈子两次）。
回答by iWheelBuy
You can also use
你也可以使用
[imageView layer].transform = CATransform3DMakeRotation(variables);
回答by Juanma Reyes
For your commodity, additionally to PengOne's answer you can use M_PI, M_PI_2, M_PI_4 constants that are available in math.h.
对于您的商品，除了 PengOne 的回答之外，您还可以使用 math.h 中可用的 M_PI、M_PI_2、M_PI_4 常量。
