Cocoa UI 元素未更新
我有一些 Cocoa UI 元素，它们与 NSView 对象中实例化的对象有出口连接，而该对象又由 NSViewController 放置在那里。这些元素（明确的进度条和文本标签）不会更新：尽管其值不断变化，但进度条是死的和空的，文本标签不会通过 [textLabel setHidden:NO] 取消隐藏，文本标签不会更改它的字符串。
我所知道的是：
- 绑定值和在代码中设置它们之间没有区别。无论哪种方式都没有改变。
- 我检查过插座连接。他们都在那里。
- 我尝试过 [X displayIfNeeded]，其中 X 是 UI 对象本身、包含的 NSView 和主窗口。没有区别。
- [progressBar setUsesThreadedAnimation:YES] 没有区别。有趣的是，如果我在程序中查看进度条，_threadedAnimation 仍然是“否”。
- 保存所有这些出口并执行导入操作的对象位于 NSViewController 对象拥有的 NSOperationQueue 中。
谢谢！
编辑：按照建议，我调用了 [self PerformSelectorOnMainThread:@selector(updateProgress:) withObject:[NSNumber numberWithInt:myObject] waitUntilDone:NO]。 （我也尝试过 waitUntilDone:YES。）它仍然没有更新。调试器清楚地显示 updateProgress: 发生在主线程中，所以我不知道缺少什么。
I have a few Cocoa UI elements with outlet connexions to an object instantiated within an NSView object, which is in turn put there by an NSViewController. These elements, a definite progress bar and a text label, are not updating: the progress bar is dead and empty despite having its value change constantly, the text label does not unhide through [textLabel setHidden:NO], the text label does not change its string.
What I know:
- There's no difference between binding values and setting them in code. Nothing changes either way.
- I've checked outlet connections. They're all there.
- I've tried [X displayIfNeeded], where X has been the UI objects themselves, the containing NSView, and the main window. No difference.
- [progressBar setUsesThreadedAnimation:YES] makes no difference. Interestingly, if I look at progressBar mid-program, _threadedAnimation is still NO.
- The object holding all these outlets and performing an import operation is in an NSOperationQueue owned by the NSViewController object.
Thanks!
EDIT: As suggested, I called [self performSelectorOnMainThread:@selector(updateProgress:) withObject:[NSNumber numberWithInt:myObject] waitUntilDone:NO]. (I've also tried waitUntilDone:YES.) It's still not updating. The debugger clearly shows updateProgress: taking place in the main thread, so I don't know what's missing.
如果你对这篇内容有疑问，欢迎到本站社区发帖提问 参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。
绑定邮箱获取回复消息
由于您还没有绑定你的真实邮箱，如果其他用户或者作者回复了您的评论，将不能在第一时间通知您！
发布评论
评论（1）
所有 NSOperation 任务都在单独的线程中执行。不允许您从单独的线程修改 UI，因为 AppKit 不是线程安全的。您将需要重构代码，以便使用以下方法在主线程上执行任何修改用户界面的调用：
All
NSOperationtasks are performed in separate threads. You are not allowed to modify the UI from a separate thread as AppKit is not thread-safe. You will need to refactor your code so that any calls that modify the user interface are performed on the main thread using the method: