IOS视图转换修改帧？ [英] IOS view transformation modifies frame?

问题描述

我有一个视图，我在drawRect中做一些特定的绘图。这些图纸是动态的，基于视图的宽度和高度。然后，包含它的视图对其应用旋转变换。然而，这种转换似乎调整了我的视图框架的值，这会影响我在drawRect中的绘图。

I have a view in which I am doing some specific drawings in drawRect. These drawings are dynamic and are based on the view's width and height. Then, the view which contains it applies a rotation transformation to it. However this transformation seems to adjust the values for my view's frame which impacts my drawing in drawRect.

NSLog（@之前：％f，％f，％f，％f，button.frame.origin.x，button.frame.origin.y， button.frame.size.width，button.frame.size.height）;

NSLog(@"before:%f,%f,%f,%f",button.frame.origin.x,button.frame.origin.y,button.frame.size.width,button.frame.size.height);

    CGAffineTransform currentTransform = button.transform;
    CGAffineTransform transformRotate = CGAffineTransformMakeRotation(degreesToRadians);
    button.transform = transformRotate;

    NSLog(@"after:%f,%f,%f,%f",button.frame.origin.x,button.frame.origin.y,button.frame.size.width,button.frame.size.height);

以下是输出：

之前：50.000000,100.000000,150.000000,50.000000
之后：65.849365,47.548096,118.301262,154.903809

before:50.000000,100.000000,150.000000,50.000000 after:65.849365,47.548096,118.301262,154.903809

这是正确的行为还是我错误地应用了转换？

Is this correct behaviour or am I applying the transformation incorrectly?

推荐答案

请参阅 UIView的框架属性;

框架

frame

框架矩形，用于描述
中视图的位置和大小它的superview的坐标系。

The frame rectangle, which describes the view’s location and size in its superview’s coordinate system.

@property(nonatomic) CGRect frame

警告

如果transform属性不是identity变换，则
的值未定义此属性d因此应该被忽略。

If the transform property is not the identity transform, the value of this property is undefined and therefore should be ignored.

---

尽管有这样的警告，事情仍按预期工作。一旦应用了变换（其他身份），帧通常会生成原始视图的投影矩形。
但是，如果您真的想要了解应用转换的框架并使用 CGRectApplyAffineTransform 正确获取它。

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