UIImagePickerController調用相冊/相機

- (IBAction)GetPhoto:(id)sender
{
    UIActionSheet *sheet;
    // 判斷是否支持相機
    if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera])
    {
        sheet = [[UIActionSheet alloc] initWithTitle:@"選擇" delegate:self cancelButtonTitle:nil destructiveButtonTitle:@"從相冊選擇" otherButtonTitles:@"拍照",@"取消", nil];
    }
    else
    {
        sheet = [[UIActionSheet alloc] initWithTitle:@"選擇" delegate:self cancelButtonTitle:nil destructiveButtonTitle:@"從相冊選擇" otherButtonTitles:@"取消", nil];
    }
    [sheet showInView:self.view];
    
}

// 添加圖片
#pragma mark -------UIActionSheetDelegate
-(void) actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex
{
    NSUInteger sourceType = 0;
    // 判斷是否支持相機
    if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera])
    {
        switch (buttonIndex)
        {
            case 0:
                // 從相冊中選取照片
                sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
                break;
            case 1:
                // 從攝像頭選取照片
                sourceType = UIImagePickerControllerSourceTypeCamera;
                break;
                
            case 2:
                // 取消
                return;
        }
    }
    else
    {
        // 顯示全部的照片
        sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;
    }
    
    // 跳轉到相機或相冊頁面
    UIImagePickerController *picker = [[UIImagePickerController alloc] init];
    picker.delegate = self;
    picker.sourceType = sourceType;
    // 設置爲YES，表示 容許用戶編輯圖片，不然，不容許用戶編輯
    picker.allowsEditing = NO;
    [self presentViewController:picker animated:YES completion:nil];
}

#pragma mark - UIImagePickerControllerDelegate
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    UIImage *image = [info objectForKey:UIImagePickerControllerOriginalImage];
    self.img.image = image;
    
    [picker dismissViewControllerAnimated:YES completion:nil];
}

// 用戶選擇取消
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker
{
    [picker dismissViewControllerAnimated:YES completion:^{}];
}