Question

我的视图控制器上有3个图像视图。我有一个选择，如选择画廊或拍照。现在，我想要的是相机。我想默认选择图像，我们可以选择一个，但我想要三个我们如何实现它。

Answer 1

使用Tag概念

<强>步骤1

最初将每个imageView的标记指定为1,2,3，然后创建一个打开UIImagePickerController的常用方法

<强>步骤-2

为每张图片创建手势

    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleImageTap:)];
tap.cancelsTouchesInView = YES;
tap.numberOfTapsRequired = 1;
tap.delegate = self;
 imageView.userInteractionEnabled = YES;
[imageView addGestureRecognizer:tap];

调用方法如

- (IBAction)handleImageTap:(UIGestureRecognizer*)sender

{

UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"Attach image" message:@"" preferredStyle:UIAlertControllerStyleActionSheet];
UIAlertAction* pickFromGallery = [UIAlertAction actionWithTitle:@"Take a photo"
                                                          style:UIAlertActionStyleDefault
                                                        handler:^(UIAlertAction * action) {
                                                            if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera])
                                                            {
                                                                UIImagePickerController* picker = [[UIImagePickerController alloc] init];
                                                                picker.view.tag = sender.view.tag;
                                                                picker.sourceType = UIImagePickerControllerSourceTypeCamera;
                                                                picker.delegate = self;
                                                                picker.allowsEditing = YES;
                                                                [self presentViewController:picker animated:YES completion:NULL];
                                                            }

                                                        }];
UIAlertAction* takeAPicture = [UIAlertAction actionWithTitle:@"Choose from gallery"
                                                       style:UIAlertActionStyleDefault
                                                     handler:^(UIAlertAction * action) {
                                                         UIImagePickerController* picker = [[UIImagePickerController alloc] init];
                                                         picker.view.tag = sender.view.tag;
                                                         picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
                                                         picker.delegate = self;
                                                         picker.allowsEditing = YES;
                                                         [self  presentViewController:picker animated:YES completion:NULL];
                                                     }];
UIAlertAction* cancel = [UIAlertAction actionWithTitle:@"Cancel"
                                                 style:UIAlertActionStyleCancel
                                               handler:^(UIAlertAction * action) {
                                               }];

[alertController addAction:pickFromGallery];
[alertController addAction:takeAPicture];
[alertController addAction:cancel];
[self presentViewController:alertController animated:YES completion:NULL];

}

<强>步骤-3

关于该委托方法的

-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info
{
if(picker.view.tag == 1)
{
 // assign the image to first
}
else if(picker.view.tag == 2)
{
 // assign the image to second
}
else
{

// assign the image to third
}

}

Answer 2

您可以编写自己的逻辑，例如

在didFinishPickingImage递增一个计数器，并且在计数器达到3之前不要忽略image picker控制，并且每次在文档目录或临时目录中存储本地存储时都存储图像。

请参阅this so post的已接受答案，以证明我所解释的内容。

如果您想使用第三方库，则ELCImagePickerController 是更好的解决方案。

Answer 3

我建议您使用两个第三方选择多张图片并尽可能处理： -

1-ELCImagePickerController

2-CTAssetsPickerController

来自相机的多个imagePicker

3 个答案: