[英]`NSTreeController`'s `arrangedObjects` doesn't respond to `children`
In the NSTreeController
's arrangedObjects
doc it says: 在
NSTreeController
的arrangedObjects
DOC ,它说:
The value of this property represents a proxy root tree node containing the tree controller's sorted content objects.
此属性的值表示包含树控制器的已排序内容对象的代理根树节点。 The proxy object responds to children and descendant(at:) messages.
代理对象响应子代和后代(at :)消息。 This property is observable using key-value observing.
可使用键值观察来观察此属性。
But in the following code the if
never hits its body. 但是在下面的代码中,
if
永远不会触及它的主体。
#import "NSTreeController+RootNodes_m.h"
@implementation NSTreeController (RootNodes_m)
- (NSArray *) rootNodes {
NSObject * arranged = self.arrangedObjects;
if ([arranged respondsToSelector: @selector(children)]) {
return [arranged performSelector:@selector(children)];
}
return nil;
}
@end
I wrote this Obj-C category because in my Swift project I can't turn on "whole module optimization" when I archive the product for release when using a "hack" from this question . 我之所以写这个Obj-C类别,是因为在我的Swift项目中,当我使用此问题的“ hack”来归档要发布的产品时,无法打开“整个模块优化”。 So I tried adding this category, which got me even "worse" result.
因此,我尝试添加此类别,这使我什至“更糟”的结果。
When you're using Objective-C, you should look at the Objective-C version of the docs . 使用Objective-C时,应查看docs的Objective-C版本 。 The page you linked to has a Language selector toward the top-right.
链接到的页面的右上角有一个语言选择器。
In the Objective-C docs, you'll find that the proxy responds to -childNodes
, not -children
. 在Objective-C文档中,您会发现代理响应
-childNodes
而不是-children
。
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