打开相册另类写法

- (IBAction)actionPhoto:(id)sender
//-------------------------------------------------------------------------------------------------------------------------------------------------
{
PresentPhotoLibrary(self, YES);
}

#pragma mark - UIImagePickerControllerDelegate

//-------------------------------------------------------------------------------------------------------------------------------------------------
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
//-------------------------------------------------------------------------------------------------------------------------------------------------
{………………}

//-------------------------------------------------------------------------------------------------------------------------------------------------
BOOL PresentPhotoLibrary(id target, BOOL canEdit)
//-------------------------------------------------------------------------------------------------------------------------------------------------
{
if (([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary] == NO
&& [UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeSavedPhotosAlbum] == NO)) return NO;
//---------------------------------------------------------------------------------------------------------------------------------------------
NSString *type = (NSString *)kUTTypeImage;
UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];
//---------------------------------------------------------------------------------------------------------------------------------------------
if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary]
&& [[UIImagePickerController availableMediaTypesForSourceType:UIImagePickerControllerSourceTypePhotoLibrary] containsObject:type])
{
imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
imagePicker.mediaTypes = [NSArray arrayWithObject:type];
}
else if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeSavedPhotosAlbum]
&& [[UIImagePickerController availableMediaTypesForSourceType:UIImagePickerControllerSourceTypeSavedPhotosAlbum] containsObject:type])
{
imagePicker.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;
imagePicker.mediaTypes = [NSArray arrayWithObject:type];
}
else return NO;
//---------------------------------------------------------------------------------------------------------------------------------------------
imagePicker.allowsEditing = canEdit;
imagePicker.delegate = target;
[target presentViewController:imagePicker animated:YES completion:nil];
//---------------------------------------------------------------------------------------------------------------------------------------------
return YES;
}