我有一个应用程序将PDF的文件路径传递给自定义 – (id)init init方法.它被添加到表中,当它被选中时,它会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,每当我的文档中没有空格时,它就会推动并进入.但是当文件名中有空格时,它表示它不存在.当我删除if-else方法时,它会初始化,但崩溃因为文件不存在.我试图用常规空间替换文件路径,但该方法继续调用else部分.

那么,文件路径是不标准化和可读的,还是我的其他方法错了？