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我有一个应用程序,允许用户单击按钮将铃声保存到文档目录。我的 iPad 版本可以正常工作,但是,对 iPhone 使用相同的方法似乎不起作用。这是我用来保存的代码:

- (IBAction) saveFile:(id)sender {
    // Get the path to the Documents Directory
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];

    // Detect which button was double tapped and set up the file to save
    NSString *filePath;
    NSString *fileName;
    if (sender == downloadRingtone1){
            filePath = [[NSBundle mainBundle] pathForResource:@"RingtoneTest" ofType:@"m4r"];
            fileName = @"RingtoneTest.m4r";
    } else if (sender == downloadRingtone2){
            filePath = [[NSBundle mainBundle] pathForResource:@"RingtoneTest2" ofType:@"m4r"];
            fileName = @"RingtoneTest2.m4r";

    NSString *m4rPath = [documentsDirectory stringByAppendingPathComponent:fileName];
    NSFileManager *fileManager = [NSFileManager defaultManager];

    // Detect if the file already exists
    BOOL fileExists = [fileManager fileExistsAtPath:m4rPath];

    if (fileExists) {
            UIAlertView *alert = [[[UIAlertView alloc] initWithTitle:@"File Already Saved" message:@"The selected file already exists. Sync to iTunes to finish loading the file." delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil] autorelease];
            [alert show];
    } else {        
            // Save the file        
            [fileManager copyItemAtPath:filePath toPath:m4rPath error:nil];

            // Notify of the save
            UIAlertView *alert = [[[UIAlertView alloc] initWithTitle:@"File Saved" message:@"You must sync your device to iTunes to finish loading. For complete instructions, visit the \"Download Instructions\" page." delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil] autorelease];
            [alert show];
    }
}

我知道这是文件管理器的问题。正如所发布的,它总是像文件存在一样进入 if 语句(它不存在)。当我将 if 语句注释掉以强制它保存时,应用程序崩溃了。我究竟做错了什么?你和 iPhone 有什么不同吗?另外,我认为这不是问题,但我正在 iPod touch 上进行测试(它已更新到最新的 iOS 4.2.1。我无法使用 iPhone。任何帮助将不胜感激。

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1 回答 1

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上面的代码是正确的。如果有人遇到同样的问题,请确保将按钮连接到 Interface Builder 中的正确插座。

于 2011-01-11T19:12:07.390 回答