macos – 为什么我在NSView中使用大多数contentGravity常量时会看到崩溃？

概述我有一个NSView子类,并在initWithFrame方法中设置以下内容： self.wantsLayer = YES;self.layer.contents = [NSImage imageNamed:@"sprite-sheet"];self.layer.contentsGravity = kCAGravityLeft; 当我运行它时,我得到了预期的视觉结果……以及以下日志崩溃： ** 我有一个NSVIEw子类,并在initWithFrame方法中设置以下内容：

self.wantsLayer = YES;self.layer.contents = [NSImage imagenamed:@"sprite-sheet"];self.layer.contentsGravity = kCAGravityleft;

当我运行它时,我得到了预期的视觉结果……以及以下日志崩溃：

** Misuse of NSImage and CALayer. contentsGravity is left. It should be one of resize,resizeAspect,or resizeAspectFill.

为什么？文档中没有迹象表明不应使用其他值.

解决方法 实际上,您看到的行为是在文档中.它只是在NSImage文档中,而不是CALayer文档(由我强调)：

Using Images with CALayer Objects

Although you can assign an NSImage object directly to the contents property of a CALayer object,doing so may not always yIEld the best results. Instead of using your image object,you can use the layerContentsForContentsScale: method to obtain an object that you can use for your layer’s contents. That method creates an image that is suited for use as the contents of a layer and that is supports all of the layer’s gravity modes. By contrast,the NSImage class supports only the kCAGravityResize,kCAGravityResizeAspect,and kCAGravityResizeAspectFill modes.

总结

以上是内存溢出为你收集整理的macos – 为什么我在NSView中使用大多数contentGravity常量时会看到崩溃？全部内容，希望文章能够帮你解决macos – 为什么我在NSView中使用大多数contentGravity常量时会看到崩溃？所遇到的程序开发问题。

如果觉得内存溢出网站内容还不错，欢迎将内存溢出网站推荐给程序员好友。