xcode 获取Objective C IPad App中任何控件的绝对位置
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Get Absolute location of Any Control in Objective C IPad App
提问by HackAndSlasher
Im wondering if there is anyway that you can get the absolute location of a control in a ipad/iphone application. e.g. I have a TextField which is within a child of a child of a view. I want to know the X and Y values in relation to the top Parent View (e.g. currently the x and Y of the textfield return 10 and 10 because that is it's frame location within its own view, but I want to know this in relation to its parent which should be something like X = 10 and Y = 220). I need to make a generic method for this somehow. Hope this make sense.
我想知道是否有任何方法可以获得 ipad/iphone 应用程序中控件的绝对位置。例如，我有一个位于视图子项的子项内的 TextField。我想知道与顶部父视图相关的 X 和 Y 值（例如，当前文本字段的 x 和 Y 返回 10 和 10，因为这是它自己视图中的框架位置，但我想知道这一点与它的父级应该类似于 X = 10 和 Y = 220）。我需要以某种方式为此制定一个通用方法。希望这是有道理的。
Any ideas?
有任何想法吗？
回答by Jeremy W. Sherman
You are looking for -[UIView convertPoint:toView:].
您正在寻找-[UIView convertPoint:toView:].
For example, to get the origin of a view viewin terms of its window's base coordinates, you would write:
例如，要view根据窗口的基坐标获取视图的原点，您可以编写：
CGPoint localPoint = [view bounds].origin;
CGPoint basePoint = [view convertPoint:localPoint toView:nil];
If you instead want to convert the point into the coordinate system of some other view within the same window, you can use that view as the toView:argument instead of nil:
如果您想将点转换为同一窗口内其他视图的坐标系，您可以使用该视图作为toView:参数而不是nil：
NSAssert([view window] == [otherView window],
@"%s: Views must be part of the same window.", __func__);
CGPoint otherPoint = [view convertPoint:localPoint toView:otherView];
Because different coordinate systems can have different scales, you might find -convertRect:toView:to be more useful, depending on what you're planning to do with the coordinates. There are also analogous -fromView:versions of both the point and rect conversion methods.
因为不同的坐标系可以有不同的比例，您可能会发现-convertRect:toView:更有用，这取决于您打算对坐标做什么。-fromView:点和矩形转换方法也有类似的版本。
