iphone - 使用视频的 ImagePicker。奇怪的编译器错误

Question

我一直在努力让视频正常工作，但遇到了一个与编译器有关的奇怪问题。我的代码看起来像这样。

 UIImagePickerController * imagePicker = [[UIImagePickerController alloc] init];
    imagePicker.delegate = self;

    NSArray *sourceTypes = [UIImagePickerController availableMediaTypesForSourceType:imagePicker.sourceType];

    imagePicker.sourceType  = UIImagePickerControllerSourceTypeCamera;
    imagePicker.mediaTypes = [NSArray arrayWithObject:(NSString *)kUTTypeMovie];
    [self presentModalViewController:imagePicker animated:YES];
    [imagePicker release];

我得到的编译器错误是:

Undefined symbols: "_kUTTypeMovie", referenced from: _kUTTypeMovie$non_lazy_ptr in EditViewController.o (maybe you meant: _kUTTypeMovie$non_lazy_ptr) ld: symbol(s) not found collect2: ld returned 1 exit status

我已经为此工作了一段时间，但无法弄清楚我的问题出在哪里。我已经导入了核心服务，所以我可以访问 kUTTypeMovie。

Answer 1

您是否尝试调用 availableMediaTypesForSourceType: 来测试相机？

通过添加 MobileCoreServices 框架并相应地使用 #import 导入它来解决问题。