将UIImage或UIView旋转到特定角度，而不是角度 [英] Rotate a UIImage or UIView to a particular angle, NOT an amount of angle

问题描述

适用于iOS的Objective-C。

Objective-C for iOS.

如何将图像或视图旋转到特定角度。
我已经尝试过以下两种方法，但两者都旋转角度的AMOUNT，而不是角度。
基本上我想调用一个方法旋转到90'，然后再次调用180'，图像/视图完成180'，而不是两者都添加（270'）这是什么如果我使用以下任一方法，就会发生。

How do I rotate an image or view TO a particular angle. I have tried the two methods below, but both rotate the AMOUNT of angle, not TO the angle. Basically I would like to call a method to rotate to 90' and then say call again of 180', and the image/view to finish at 180', NOT an addition of them both (270') which is what happens if I use either of the methods below.

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

myImage.transform = CGAffineTransformMakeRotation(degreesToRadians(90));

myImage.transform = CGAffineTransformRotate(myImage.transform, degreesToRadians(90));

非常感谢！

推荐答案

重置

.transform = CGAffineTransformIdentity

在其他转换之前......

before the other transforms...

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