如何检测iCloud中文件的更改时间？ [英] How do you detect when a file is changed in iCloud?

问题描述

在iCloud中更改文件时（无论是添加，删除还是更改了内容），我想调用我创建的方法（ [self methodName] ）这样我就可以用新文件的名称更新我的表视图。如何通知文件更改？我是否需要收听NSNotification（如果是，它是什么？）或者我是否必须手动检查？谢谢。

When a file is changed in iCloud (whether added, deleted, or the content changed), I would like to call a method I created ([self methodName]) so that I can update my table view with the names of the new files. How am I notified of the file change? Do I need to listen for a NSNotification (if so, what is it?) or do I have to check manually? Thanks.

推荐答案

我要监听的NSNotification的名称是 NSMetadataQueryDidUpdateNotification 。我就这样做了：

The name of the NSNotification I have to listen for is NSMetadataQueryDidUpdateNotification. This is how I did it:

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(queryDidUpdate:) name:NSMetadataQueryDidUpdateNotification object:query];

...

-(void)queryDidUpdate:(NSNotification *)notification {

    //something changed, reload (NSMetadataQuery, create NSPredicate, rerun the query, etc.)

}

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