objective-c - iOS 6 中的 self.view presentviewcontroller:UIImagePickerController 崩溃

Question

当我尝试从 xcode 4.5 调用相册时，应用程序崩溃。注意：我将应用程序方向设置为横向模式。

UIImagePickerController *picker=nil;
if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeSavedPhotosAlbum])
{
    picker = [[UIImagePickerController alloc] init];
    picker.delegate = self;
    picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;

    picker.allowsEditing = NO;
    picker.mediaTypes = [UIImagePickerController availableMediaTypesForSourceType:
            UIImagePickerControllerSourceTypeSavedPhotosAlbum];

}

if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone ) {
    [self presentViewController:picker animated:YES completion:nil];
}

Answer 1

您的逻辑中的一个错误是，如果isSourceTypeAvailable在 iPhone 上返回 NO，您将尝试提供一个nil.