旋转45°的UIView消失了吗？ [英] UIView rotated by 45° disappears?

问题描述

也许我没有得到。当我这样做时

maybe I don't get. When I do

self.tweetPeak.transform = CGAffineTransformMakeRotation(RADIANS(45));

其中RADIAN

#define RADIANS(degrees) ((degrees * M_PI) / 180.0)

在一个简单的UIView对象上，它将消失。

on a simple UIView Object it will disappear.

我想这只是为了看到它。我的印象是视图在20到45度之间变小。

I guess it's just to thin to see. My impression is that the view is getting smaller in a range between 20 to 45 degrees.

这是什么？我试图将视图设置为不透明。没有效果。

What is it? I tried to set the view opaque. No effect.

chris

推荐答案

你需要停止调整旋转后的帧，它会导致对变换矩阵的不期望的拉伸，我不确定正式的原因，但它与Apple使用他们自己的矩阵系统而不是传统的矩阵来表示2D / 3D平移/旋转/规模。前几天我遇到了同样的问题，为了修复它，而不是旋转那个视图，我只是把它变成了一个容器，里面有我希望旋转的实际视图，然后旋转它。

You need to stop adjusting the frame after the rotation, it causes undesired stretching to the transform matrix, I'm unsure to the formal reason why, but it has something to do with Apple using their own matrix system rather than traditional matrices to represent 2D/3D translations/rotations/scale. I was having the same problem the other day, to fix it, instead of rotating that view, I just made it a container with the actual view I wanted rotated inside, and rotated that.

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