将CGPoint从CGRect转换为其他CGRect [英] Convert CGPoint from CGRect to other CGRect

问题描述

我在视图上放置了一个标签，视图的框架为 CGRectMake(0,0,270,203).现在，我必须使用 CGRectMake(0,0,800,600)来拍摄屏幕快照.因此，我必须将标签从旧矩形转换为新矩形.

I have placed one label on view and view's frame is CGRectMake(0,0,270,203). Now I have to take screen shot of view with CGRectMake(0,0,800,600). So I have to convert label from old rect to new rect.

这是我用来拍摄屏幕截图的代码:

here is code which I used to take screen shot:

CGRect rect = [view bounds];
UIGraphicsBeginImageContextWithOptions(rect.size,YES,0.0f);
CGContextRef context = UIGraphicsGetCurrentContext();
[view.layer renderInContext:context];
UIImage *capturedImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

这是我用来转换点的代码:

Here is the code which I used to convert point:

CGRect f = [view convertRect:lblMessage.frame fromView:viewMessage];

但是我无法从新图像的标签中获取实际位置.谁能帮助我哪里做错了.

But I am not able to get actual position from label in new image. Can anyone help where I am wrong.

在这里，我附上了图片，以供进一步说明. 在小视图中，我添加了一个标签，并且必须按照大图像视图转换标签的框架.

Here I have attached image for more clarification. In small view, I have add one label and I have to convert label's frame as per big image view.

谢谢

推荐答案

您可以执行以下操作:

-(CGPoint) convertPoint: (CGPoint) point fromRect: (CGRect) fromRect toRect: (CGRect) toRect {
    return (CGPoint){
        (toRect.size.width/fromRect.size.width) * point.x,
        (toRect.size.height/fromRect.size.height) * point.y
    };
}

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