在iPad中启用相机限制会在打开相机时抛出NSException

Question

我已经启用了限制，并且在iPad的设置中禁用了相机和FaceTime，在隐私标签中，我禁用了对我的应用程序的照片访问权限。

我正在使用以下代码打开相机和照片库，

//For camera
UIImagePickerController *picker = [[UIImagePickerController alloc] init];
picker.sourceType = UIImagePickerControllerSourceTypeCamera;
picker.delegate = self;
picker.allowsEditing = NO;
[self.view.window.rootViewController presentViewController:picker animated:YES completion:nil];

//For Photo library
UIImagePickerController *picker = [[UIImagePickerController alloc] init];
picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
picker.delegate = self;
picker.allowsEditing = NO;
[self.view.window.rootViewController presentViewController:picker animated:YES completion:nil];

打开照片库时，它会清楚地显示一条消息，表明访问被拒绝，可以在设置应用中更改。但是在打开相机时，应用程序崩溃抛出错误，

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Source type 1 not available' *** First throw call stack: (0x30584f4b 0x3ac566af 0x32f56d69 0x1141d9 0x32ee4d03 0x32d2c713 0x32d2c6b3 0x32d2c691 0x32d1811f 0x32d2c107 0x32d2bdd9 0x32d26e65 0x32cfc79d 0x32cfafa3 0x30550183 0x3054f653 0x3054de47 0x304b8c27 0x304b8a0b 0x3518c283 0x32d5c049 0xeff7d 0x3b15eab7) libc++abi.dylib: terminating with uncaught exception of type NSException

如何解决这个问题？

Answer 1

您应该始终检查源类型是否可用：

来自Apple UIImagePickerController doucmentatiom

  

验证设备是否能够从所需内容中挑选内容   资源。这样做是调用isSourceTypeAvailable:类方法，   提供UIImagePickerControllerSourceType的常量   枚举。

检查源是否可用，如：

if ([UIImagePickerController isSourceTypeAvailable: UIImagePickerControllerSourceTypePhotoLibrary]) {
 // UIImagePickerControllerSourceTypePhotoLibrary is available.
}