objective-c - 如何捕捉 NSWorkspaceDidPerformFileOperationNotification？

Question

我试图在文件操作执行后获得回调，但我无法捕获 NSWorkspaceDidPerformFileOperationNotification 发布。

[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(finderDidFileOperation:) name:NSWorkspaceDidPerformFileOperationNotification object:[NSWorkspace sharedWorkspace]];
[[NSWorkspace sharedWorkspace] performFileOperation:fileOp source:source destination:item.fullPath files:objects tag:&tag];

object:nil

也没有用

[[NSWorkspace sharedWorkspace] addObserver:self forKeyPath:NSWorkspaceDidPerformFileOperationNotification options:NSKeyValueObservingOptionNew context:nil];

也是。

我做错了什么？

Answer 1

我认为这里的关键是 NSWorkspace 将通知发布到它的通知中心，而不是全局默认通知中心。来自 the docs :

Before this method returns, it posts an NSWorkspaceDidPerformFileOperationNotification to the NSWorkspace object's notification center.

尝试向该通知中心注册通知，如下所示:

[[[NSWorkspace sharedWorkspace] notificationCenter] 
    addObserver:self 
    selector:@selector(finderDidFileOperation:) 
    name:NSWorkspaceDidPerformFileOperationNotification 
    object:[NSWorkspace sharedWorkspace]];