如何翻转NSView的坐标系? [英] How do you flip the coordinate system of an NSView?

问题描述

我在接口构建器中创建了一个NSScrollView，该NSScrollView具有可变数量的半唯一NSView，可以通过编程方式从中添加和删除它们.当我将subView添加到documentView时，它们出现在左下角而不是左上角.我看到您可以检查isFlipped布尔值来确定视图的坐标系是否被翻转，但是我找不到找到将其设置为翻转状态的方法.

I have created an NSScrollView in interface builder that has a variable number of semi-unique NSViews that can be programmatically added and removed from it. When I add subViews to the documentView, they appear in the lower-left hand corner instead of the upper-left hand corner. I see that you can check the isFlipped bool to figure out if the view's coordinate system is flipped, but I cannot find a way to set it as flipped.

有人知道我想念什么吗?

Anyone know what I'm missing?

推荐答案

在您的NSView子类中，覆盖isFlipped:

isFlipped

一个布尔值，指示视图是否使用翻转的坐标系.

isFlipped

A Boolean value indicating whether the view uses a flipped coordinate system.

var isFlipped: Bool { get }

讨论

此属性的默认值为false，这将导致坐标系不翻转.

Discussion

The default value of this property is false, which results in a non-flipped coordinate system.

[...]

如果您希望视图使用翻转的坐标系，请覆盖此属性并返回true.

If you want your view to use a flipped coordinate system, override this property and return true.

^{来源: isFlipped-NSView | Apple开发人员文档}

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