Question

我已经在Android中完成此操作，但似乎找不到在iOS中执行此操作的任何信息。基本上：

Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
intent.setType("image/JPEG");
Intent i = Intent.createChooser(intent, "File");
startActivityForResult(i, CHOOSE_FILE_REQUESTCODE);

然后

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    // Check which request we're responding to
    if (requestCode == CHOOSE_FILE_REQUESTCODE) {
        // Make sure the request was successful
        if (resultCode == RESULT_OK) {
            // The user picked a contact.
            // The Intent's data Uri identifies which contact was selected.

            // Do something with the contact here (bigger example below)
        }
    }
}

相应的术语和示例代码在哪里/什么地方？

（赞赏有目的的C示例）

Answer 1

iOS中的UIImagePickerController视图控制器是允许用户从那里的媒体库中选择图片的标准方法。有关UIImagePickerController.的Apple文档，请访问Picking images with UIImagePickerController in Swift 5。还有一个很好的教程，展示了如何在Android record video into a circular buffer and storing it in RAM使用UIImagePickerController。

Answer 2

这应该正是您要查找的内容：https://stackoverflow.com/a/41717882/2968456

基本上，您需要使用Apple内置的UIImagePicker框架。

Answer 3

信用主要是供其他答案参考，但这是Objective-C示例代码：

UIImagePickerController *picker = [[UIImagePickerController alloc] init];
picker.delegate = self;
picker.allowsEditing = YES;
picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
presentViewController:picker animated:YES completion:nil];

带有图像数据的回调：

/*============================================================================*/

-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info

/*============================================================================*/
{
    [picker dismissViewControllerAnimated:YES completion:nil];
    [picker release];

    UIImage* image = [info objectForKey:UIImagePickerControllerEditedImage];
    if (!image)
        image = [info objectForKey:UIImagePickerControllerOriginalImage];

    NSData* imgData = UIImageJPEGRepresentation(image, 1.0);
    NSLog(@"Size of Image(bytes):%lu",(unsigned long)[imgData length]);
}

代理/ self必须为：

UIViewController <UINavigationControllerDelegate, UIImagePickerControllerDelegate>

提示iOS用户选择要由应用处理的JPEG

3 个答案: