将UIDocument移动到文件系统上的新位置的正确方法是什么？ [英] What is the proper way to move a UIDocument to a new location on the file-system

问题描述

我有一个基于文档的iOS应用程序，它包含一个 UIDocument 子类。我需要能够移动它在文件系统上表示的文件。我曾考虑将它移动到 NSFileManager ，但是这会弄乱 UIDocument 的 fileURL 属性。关于如何解决这个小难题的任何想法？解决方案

处理程序，使用NSFileManager移动文件。一旦文件被成功移动，使用新的文件URL初始化你的UIDocument子类的一个新实例：

  NSURL * directoryURL = [_document.fileURL URLByDeletingLastPathComponent]; 
 NSFileManager * fileManager = [[NSFileManager alloc] init]; 
 NSString * filePath = [directoryURL.path stringByAppendingPathComponent：@NewFileName]; 
 
 [_document closeWithCompletionHandler：^（BOOL success）{
 NSError * error; 
 
 if（success）
 success = [fileManager moveItemAtPath：_document.fileURL.path toPath：filePath error：& error]; 
 
 if（success）{
 NSURL * url = [NSURL fileURLWithPath：filePath]; 
 
 //我打开文档并更新setDocument中的UI：
 self.document = [[MyDocumentSubclass alloc] initWithFileName：[url lastPathComponent] dateModified：[NSDate date] andURL：url ]。 
} else {
 UIAlertView * alert = [[UIAlertView alloc] initWithTitle：nil message：@无法重命名文档委托：无cancelButtonTitle：@DismissotherButtonTitles：nil]; 
 [alert show]; 
 NSLog（@无法移动文档：％@，错误）; 
} 
}]; 
  

I have a document-based iOS application with a UIDocument subclass. I need to be able to move the file it represents on the file-system. I have considered moving it with an NSFileManager, but this would mess up the UIDocument's fileURL property. Any ideas on how to solve this little conundrum?

解决方案

You can rename a UIDocument by first closing it, and then in the completion handler, moving the file using NSFileManager. Once the file has been successfully moved, initialize a new instance of your UIDocument subclass using the new file URL:

NSURL *directoryURL = [_document.fileURL URLByDeletingLastPathComponent];    
NSFileManager *fileManager = [[NSFileManager alloc] init];    
NSString *filePath = [directoryURL.path stringByAppendingPathComponent:@"NewFileName"];

[_document closeWithCompletionHandler:^(BOOL success) {
    NSError *error;

    if (success)
        success = [fileManager moveItemAtPath:_document.fileURL.path toPath:filePath error:&error];

    if (success) {
        NSURL *url = [NSURL fileURLWithPath:filePath];

        // I handle opening the document and updating the UI in setDocument:
        self.document = [[MyDocumentSubclass alloc] initWithFileName:[url lastPathComponent] dateModified:[NSDate date] andURL:url];
    } else {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:nil message:@"Unable to rename document" delegate:nil cancelButtonTitle:@"Dismiss" otherButtonTitles:nil];
        [alert show];
        NSLog(@"Unable to move document: %@", error);
    }
}];

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