问题描述
编写Cocoa应用程序时，我以编程方式完成大部分用户界面布局。例如：
When writing Cocoa apps, I do the majority of the user interface layout programmatically. For example:
NSRect popUpFrame = NSMakeRect(10, 10, 100, kDefaultPopUpButtonHeight);
NSPopUpButton * popUp = [[NSPopUpButton alloc] initWithFrame:popUpFrame];
//...
我的问题是关于 kDefaultPopUpButtonHeight 常数。我目前维护一个充满这样的常量的源文件，我手动填充适当的大小。我可以通过在Interface Builder中的一个空白视图中放置一个新控件，然后检查其属性来确定IB的大小来确定正确的大小。
My question is about that kDefaultPopUpButtonHeight constant. I currently maintain a source file full of such constants, and I fill in the proper sizes manually. I am able to determine the correct sizes by dropping a new control into a blank view in Interface Builder and then checking its properties to see what size IB gives it.
是一个更好的方式。是否可以在运行时访问这些值？理想情况下，我希望每个 NSControl 有一个类方法： +（NSSize）defaultSize 控件类似于 NSButton ，它们具有不同的默认大小，具体取决于所使用的特定按钮样式，例如 +（NSSize）defaultSizeForButtonStyle：（NSButtonStyle）buttonStyle 。
There must be a better way. Is it possible to access these values at runtime? Ideally, I would expect every NSControl to have a class method something like: +(NSSize)defaultSize, or, for controls like NSButton that have different default sizes depending on the particular button style used, something like +(NSSize)defaultSizeForButtonStyle:(NSButtonStyle)buttonStyle.
包含有关控件布局和控件之间的间距的信息，但它并未说明有关各个控件的正确大小的信息。
Apple's Human Interface Guidelines has information about control layout and the spacing between controls, but it doesn't say anything about the proper sizes for individual controls.
推荐答案
我同意Peter，并建议您使用Interface Builder。但是如果这在你的情况下是不合适的，这里有一种方法来找到大多数控件的最佳尺寸：
I agree with Peter, and would recomend that you use Interface Builder. But if that isn't appropriate in your situation, here's one way to find the best size for most controls:
NSSize idealSize = [[control cell] cellSize];
如果您需要更多地控制大小，可以使用 - [NSCell cellSizeForBounds：]方法。
If you need more control over the sizing, you can use the -[NSCell cellSizeForBounds:] method.
此外，cellSize真的给你一个控件的最小尺寸，不一定是最好的尺寸。例如，对于带有文本OK的Cocoa aqua样式按钮，它将返回比HIG将推荐的宽度更窄的宽度。为了你的目的，它听起来像你只对固定高度部分的大小感兴趣。 - [NSCell cellSize]应该工作很好。
Also, cellSize really gives you the minimum size for a control, not necessarily the best size. For example, for a Cocoa aqua style push button with the text "OK", it would return a width that more narrow than the HIG would recommend. For your purposes, it sounds like you're only interested in the fixed hight portion of the size. -[NSCell cellSize] should work great.
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