自我崩溃.view presentview：iOS 6中的UIImagePickerController

Question

当我尝试从xcode 4.5调用相册时，应用程序崩溃了。 注意：我将应用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，您将尝试呈现nil的控制器。