NSSavePanel:压缩“确认替换?"按钮.对话 [英] NSSavePanel: Squelching the "confirm replace?" dialog

问题描述

在Nav Services的世界中，可以指定kNavDontConfirmReplacement作为创建NavDialogRef的选项，当使用已存在的文件名进行保存时，它不会要求用户确认文件的替换.如何指定可可NSSavePanel的等效行为?

In the Nav Services world one could specify kNavDontConfirmReplacement as an option to create a NavDialogRef that would not ask the user to confirm the replacement of a file when saving with a file name that already exists. How do I specify an equivalent behavior with the Cocoa NSSavePanel?

推荐答案

以下是操作方法:

1. 添加委托以处理NSSavePanel回调
2. 在您的代表中覆盖- (NSString*)panel:(id)sender userEnteredFilename:(NSString*)filename confirmed:(BOOL)okFlag
3. 在代表中:

1. Add a delegate to handle NSSavePanel callbacks
2. Override - (NSString*)panel:(id)sender userEnteredFilename:(NSString*)filename confirmed:(BOOL)okFlag in your delegate
3. In the delegate:

1. 如果okFlag是false，则返回filename
2. 否则，请在您的代表中将filename保留为NSString*
3. 返回一些不太可能是实际文件名的唯一字符串

1. If okFlag is false, return filename
2. Otherwise, retain filename as an NSString* in your delegate
3. Return some unique string that is highly unlikely to be the name of an actual file

NSSavePanel返回代码时，请从委托方法中提取filename的值，并丢弃NSSavePanel告诉您的任何文件名(应为唯一字符串).

When NSSavePanel returns to your code, pull the value of filename from your delegate method, and discard whatever filename NSSavePanel told you (which should be your unique string).

由于操作系统在进行确认替换检查之前已调用userEnteredFilename:，因此您有机会获得用户指定的内容，而无需让操作系统进入机密状态.唯一的字符串将确保不会意外弹出确认替换对话框.

Since userEnteredFilename: is called by the OS before the confirm-replace check is made it gives you a chance to get what the user specified without letting the OS in on the secret. The unique string will assure that the confirm-replace dialog is not popped accidentally.

但有效.

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