UINavigationItem titleView“如果设置了leftBarButtonItem则忽略"?

问题描述

UINavigationItem 的 titleView 属性文档 说:

The documentation for UINavigationItem's titleView property says:

如果 leftBarButtonItem 不为零，则忽略此属性."

"This property is ignored if leftBarButtonItem is not nil."

但是，我在测试中设置了 titleView 和 leftBarButtonItem 属性，它们看起来都很好.我已经在我的 Xcode 中的所有模拟器上进行了测试:4.3、5.0 和 5.1.有谁知道文档是错误的，还是在我无法测试的某些旧版本(例如 4.2、3.x)上正确?

However, I've set both the titleView and leftBarButtonItem properties in my testing and they both appear to show up fine. I've tested on all the simulators in my Xcode: 4.3, 5.0, and 5.1. Does anyone know if the documentation is just wrong, or is it correct on some older versions (e.g. 4.2, 3.x) that I haven't been able to test?

推荐答案

查看属性文档 leftBarButtonItems，上面写着:

Check the documentation for property leftBarButtonItems, it says:

如果没有足够的空间来显示数组中的所有项目，那些会重叠标题视图(如果存在)或按钮右侧的栏不显示.

If there is not enough room to display all of the items in the array, those that would overlap the title view (if present) or the buttons on the right side of the bar are not displayed.

所以，对于 titleView 的说法可能是不正确的.

So, what's said for titleView is probably incorrect.

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