I have a simple UIImageView in my view, but I can't seem to find any feature in Apple's documentation to change the UV Coordinates of this UIImageView, to convey my idea to you, this GIF file should preview how changing 4 vertices coordinates can change how the image gets viewed on the final UIImageView.
我在视图中有一个简单的UIImageView，但我似乎无法在Apple的文档中找到任何更改此UIImageView的UV坐标的功能，以便向我传达我的想法，此GIF文件应预览更改4个顶点坐标的更改方式如何在最终的UIImageView上查看图像。
I tried to find a solution online too (other than documentation) and found none.
我试图在网上找到一个解决方案（除了文档），但没有找到。
I use Swift.
我用Swift。
1 个解决方案
#1
7
You can achieve that very animation using UIView.transform or CALayer.transform. You'll need basic geometry to convert UV coordinates to a CGAffineTransform or CATransform3D.
您可以使用UIView.transform或CALayer.transform实现该动画。您需要基本几何体将UV坐标转换为CGAffineTransform或CATransform3D。
I made an assumption that affine transform would suffice because in your animation the transform is affine (parallel lines stay parallel). In that case, 3 vertices are free -- the 4th one is constrained by the other 3.
我假设仿射变换就足够了，因为在动画中变换是仿射的（平行线保持平行）。在这种情况下，3个顶点是*的 - 第4个顶点受到其他3个顶点的约束。
If you have 3 vertices, you can compute the affine transform matrix using: Affine transformation algorithm
如果您有3个顶点，则可以使用：仿射变换算法计算仿射变换矩阵
To achieve the infinite repeat, use UIImageResizingMode.Tile.
要实现无限重复，请使用UIImageResizingMode.Tile。
#1
7
You can achieve that very animation using UIView.transform or CALayer.transform. You'll need basic geometry to convert UV coordinates to a CGAffineTransform or CATransform3D.
您可以使用UIView.transform或CALayer.transform实现该动画。您需要基本几何体将UV坐标转换为CGAffineTransform或CATransform3D。
I made an assumption that affine transform would suffice because in your animation the transform is affine (parallel lines stay parallel). In that case, 3 vertices are free -- the 4th one is constrained by the other 3.
我假设仿射变换就足够了，因为在动画中变换是仿射的（平行线保持平行）。在这种情况下，3个顶点是*的 - 第4个顶点受到其他3个顶点的约束。
If you have 3 vertices, you can compute the affine transform matrix using: Affine transformation algorithm
如果您有3个顶点，则可以使用：仿射变换算法计算仿射变换矩阵
To achieve the infinite repeat, use UIImageResizingMode.Tile.
要实现无限重复，请使用UIImageResizingMode.Tile。