7

已解决(感谢 Regexident)

我有一个将 PDF 的文件路径传递给自定义-(id)initinit 方法的应用程序。它被添加到表中,当它被选中时,它为不存在的文件调用 else 语句:

- (void) gridView:(AQGridView *)gridView didSelectItemAtIndex:(NSUInteger)index {

NSLog (@"Selected theArgument=%d\n", index);

UIViewController *viewController = [[[UIViewController alloc]init]autorelease];
{
    //if file is built-in, read from the bundle
    if (index <= 3)
    {
        // first section is our build-in documents
        NSString *fileURLs = [_documentIconsURLs objectAtIndex:index];   
        NSLog(@"file url -%@", fileURLs);
        viewController = [[[xSheetMusicViewController alloc]initWithContentURL:fileURLs]autorelease];
    }
    //if file is external, read from URL
    else
    {
        // second section is the contents of the Documents folder
        NSString *fileURL = [_documentIconsURLs objectAtIndex:index];
        NSLog(@"file url -%@", fileURL);
        NSString *path;
        NSString *documentsDirectoryPath = [self applicationDocumentsDirectory];
        NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
        path = [[paths objectAtIndex:0] stringByAppendingPathComponent:fileURL];


        if ([[NSFileManager defaultManager] fileExistsAtPath:documentsDirectoryPath])
        {
            viewController = [[[xSheetMusicViewController alloc]initWithDocumentURL:fileURL]autorelease];
        }
        else
        {
            UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Failure!"                                                            message:@"The Selected File Does Not Exist"
                                                           delegate:nil
                                                  cancelButtonTitle:@"OK"
                                                  otherButtonTitles: nil];
            [alert show];
            [alert release];        
            return;
        }
    }
[self.navigationController setNavigationBarHidden:YES animated:NO]; 
[UIView beginAnimations:@"animation" context:nil];
[UIView setAnimationDuration:1];
[UIView setAnimationTransition:UIViewAnimationTransitionCurlDown forView:self.navigationController.view cache:YES]; 
[self.navigationController pushViewController:viewController animated:NO];
[UIView commitAnimations];  
    }
}

因此,每当我有一个名称中没有空格的文档时,它就会推送并初始化。但是当文件名中有空格时,它说它不存在。当我删除 if-else 方法时,它会初始化,但由于文件不存在而崩溃。我尝试将文件路径中的 %20 替换为常规空格,但该方法继续调用 else 部分。

那么,是文件路径不规范、不可读,还是我的else方法不对?

4

1 回答 1

16

由于您的路径似乎是一个百分比转义路径字符串,我会试试这个:

[fileURL stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding]

而且我会重命名fileURLfileURLString明确它是一个包含 URL 路径的 NSString,而不是实际的 NSURL(你的变量名会错误地暗示)。

但是我会检查填充的代码_documentIconsURLs,因为它可能是您问题的根源。

于 2011-11-12T20:37:02.857 回答