iOS開發小技巧--相機相冊的正確打開方式

iOS相機相冊的正確打開方式- UIImagePickerController

• 通過指定sourceType來實現打開相冊還是相機

UIImagePickerControllerSourceTypePhotoLibrary, // 相冊庫,范圍比PhotosAlbum要大
UIImagePickerControllerSourceTypeCamera, // 相機
UIImagePickerControllerSourceTypeSavedPhotosAlbum // 相冊

• 打開之前一定判斷設備是否可用[UIImagePickerController isSourceTypeAvailable:type]

/// 打開相機
- (void)openCamera
{
    [self openImagePickerControllerWithType:UIImagePickerControllerSourceTypeCamera];
}
/// 打開相冊
- (void)openAlbum
{
    [self openImagePickerControllerWithType:UIImagePickerControllerSourceTypePhotoLibrary];
}
/// 打開ImagePickerController的方法
- (void)openImagePickerControllerWithType:(UIImagePickerControllerSourceType)type
{
    // 設備不可用  直接返回
    if (![UIImagePickerController isSourceTypeAvailable:type]) return;

    UIImagePickerController *imgPicker = [[UIImagePickerController alloc] init];
    imgPicker.sourceType = type;
    imgPicker.delegate = self;
    [self presentViewController:imgPicker animated:YES completion:nil];
}

• 代理方法中,獲取選中圖片注意:一定記得dismiss

#pragma mark - UINavigationControllerDelegate, UIImagePickerControllerDelegate
// 選擇照片之后
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info
{
//    ChaosLog(@"%@",info);
    // 獲取用戶選擇的圖片
    UIImage *image = info[UIImagePickerControllerOriginalImage];

    [self.photosView addPhoto:image];

    // 退出imagePickerController
    [self dismissViewControllerAnimated:YES completion:nil];
    [self.textView becomeFirstResponder];
}

• 系統自帶的只能單選,實現多選要用大如圖的庫