0

我有一个全屏 UIScrollView 来显示我的图像,它使用来自苹果示例代码的 PhotoScroller.app 中的一些代码。我对带有旋转的滚动视图中的图像视图的边界和转换点有点困惑。任何帮助将不胜感激!

附言。有关更多详细代码,请在边界中心找到

NSLog 调用 willRotateToInterfaceOrientation:duration:

2012-05-12 11:35:45.666 imageScrollView frame X and Y are 0.000000 and 0.000000 
2012-05-12 11:35:45.672 imageScrollView frame Width and Height are 320.000000 and 480.000000 
2012-05-12 11:35:45.677 imageScrollView bounds origin X and Y are 0.000000 and 0.000000 
2012-05-12 11:35:45.682 imageScrollView bounds Width and Height are 320.000000 and 480.000000 
2012-05-12 11:35:45.686 imageView frame origin X and Y are 0.000005 and 0.374437
2012-05-12 11:35:45.689 imageView frame size Width and Height are 320.000000 and 479.251129
2012-05-12 11:35:45.693 imageView bounds origin X and Y are 0.000000 and 0.000000
2012-05-12 11:35:45.697 imageView bounds size Width and Height are 641.000000 and 959.999939
2012-05-12 11:35:45.701 boundsCenter X and Y are 160.000000 and 240.000000 
2012-05-12 11:35:45.705 convertPoint origin X and Y are 320.500000 and 479.999969

NSLog 调用 willAnimateRotationToInterfaceOrientation:duration:

2012-05-12 11:36:05.975 imageScrollView frame X and Y are 0.000000 and 0.000000 
2012-05-12 11:36:05.978 imageScrollView frame Width and Height are 480.000000 and 320.000000 
2012-05-12 11:36:05.983 imageScrollView bounds origin X and Y are 0.000000 and 0.000000 
2012-05-12 11:36:05.987 imageScrollView bounds Width and Height are 480.000000 and 320.000000 
2012-05-12 11:36:05.990 imageView frame origin X and Y are 80.000008 and 0.000017
//I am confused here. Why is the X is 80.000008, and Y is 0.000017, but not (80, -120)?
2012-05-12 11:36:05.994 imageView frame size Width and Height are 320.000000 and 479.251099
2012-05-12 11:36:06.002 imageView bounds origin X and Y are 0.000000 and 0.000000
2012-05-12 11:36:06.006 imageView bounds size Width and Height are 641.000000 and 959.999878
2012-05-12 11:36:06.009 boundsCenter X and Y are 240.000000 and 160.000000 
2012-05-12 11:36:06.014 convertPoint origin X and Y are 320.500000 and 320.499969

关于自动调整大小配置:

actionSheetCoverView.autoresizingMask = UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth;
imageScrollView.autoresizingMask = UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth;
imageView.autoresizingMask = UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleBottomMargin | UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleRightMargin;

旋转前的imageview帧原点(willRotateToInterfaceOrientation:duration中的NSLog)是(0, 0),旋转后(willAnimateRotationToInterfaceOrientation:duration:中的NSLog),我认为应该是(80,-120)。但它是 (80.000008, 0.000017);

4

2 回答 2

1

正如我所解释的,当你不说出你为什么感到困惑或你正在尝试做什么时,很难帮助你。

要获取 imageView 的实际中心,您可以使用以下命令:

imageView.center
于 2012-05-12T04:00:22.217 回答
1

frame属性始终返回基于UIView 的 、 和 属性的计算值 boundscentertransform

根据 Apple 的UIView 文档

如果该transform属性不是恒等变换,则该frame属性的值是未定义的,因此应该被忽略。

问题是您在frame旋转动画开始时读取属性,这意味着您的视图将具有非标识transform值,从而使它们的frame值毫无意义。

您可以根据其他问题的代码记录转换值:

NSLog(@"imageScrollView transform %@", NSStringFromCGAffineTransform(self.transform));

NSLog(@"imageView transform %@", NSStringFromCGAffineTransform(imageView.transform));

这将向您显示旋转时的变换属性。如果您不熟悉身份转换,它是[1, 0, 0, 1, 0, 0].

换句话说,frame属性给你意想不到的值的原因是你的视图已经transform应用了它,使frame属性变得毫无意义。

目前尚不清楚您实际上想要实现什么,但来自同一 Apple 文档的其他注释可能会有所帮助:

如果transform属性包含非恒等变换,则frame属性的值未定义且不应修改。在这种情况下,您可以使用该属性重新定位视图并使用该center属性调整大小bounds

于 2012-05-19T06:35:17.343 回答