如何从 iOS 照片库中获取图像并在 UIWebView 中显示

How do I get an image from the iOS photo library and display it in UIWebView(如何从 iOS 照片库中获取图像并在 UIWebView 中显示)

问题描述

我见过很多使用 UIImage 输出图像的示例.我希望将输出设置为 UIWebView 因为我想在图像周围添加一些额外的 HTML 格式.

我想让照片库返回存储在 iOS 设备上的图像的相对路径，以便我可以将它放在img"HTML 标记的src"属性中.

这可能吗?

编辑 1

我不得不根据我的需要修改我的代码，但这似乎不起作用.

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{//从库中获取图片地址NSURL *urlPath = [信息 valueForKey:UIImagePickerControllerReferenceURL];NSString *urlString = [urlPath absoluteString];NSLog(urlString);NSURL *root = [[NSBundle mainBundle] bundleURL];NSString *html;html = @"<img src='";html = [html stringByAppendingString:urlString];html = [html stringByAppendingString:@"'/>"];[MemeCanvas loadHTMLString:html baseURL:root];[pickerdismissViewControllerAnimated:YES 完成:^{}];}

我能够记录资产库 URL，但它似乎没有在 UIWebView 上显示图像.我不知道我需要将 baseURL 更改为什么.

任何帮助表示赞赏.

编辑 2

我将 UIImagePickerControllerReferenceURL 更改为 UIImagePickerControllerMediaURL，现在它崩溃了，因为当我使用 stringByAppendingString:urlString<将它附加到字符串时它不喜欢它/p>

它给了我错误:

由于未捕获的异常而终止应用程序'NSInvalidArgumentException'，原因:'*** -[__NSCFConstantStringstringByAppendingString:]: 无参数'

你知道是什么原因造成的吗?

[更新到 swift 4]您可以使用 UIImagePickerController 委托来选择要编辑的图像(或 url).

你可以这样做:

让pickerController = UIImagePickerController()pickerController.sourceType = .photoLibrarypickerController.delegate = selfself.navigationController?.present(pickerController，动画:真，完成:{})

在委托实现中，您可以使用图像的路径或图像本身:

//当从库中选择图像或从相机拍摄图像时调用此方法.func imagePickerController(_picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String: Any]) {//你可以检索实际的UIImage让 image = info[UIImagePickerControllerOriginalImage] 作为?UIImage//或者你可以从AssetsLibrary中获取图片的url让 path = info[UIImagePickerControllerReferenceURL] 作为?网址picker.dismiss(动画:真，完成:无)}

I've seen a lot of examples where you use the UIImage for outputting an image. I would like the output to be set to a UIWebView because I want to put some additional HTML formatting around the image.

I want to get the photo library to return the relative path of an image stored on the iOS device, so that the I can put that in the 'src' attribute of the 'img' HTML tag.

Is this possible?

Edit 1

I had to modify my code for what I wanted but this doesn't seem to work.

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    //Get Image URL from Library
    NSURL *urlPath = [info valueForKey:UIImagePickerControllerReferenceURL];
    NSString *urlString = [urlPath absoluteString];
    NSLog(urlString);

    NSURL *root = [[NSBundle mainBundle] bundleURL];
    NSString *html;
    html = @"<img src='";
    html = [html stringByAppendingString:urlString];
    html = [html stringByAppendingString:@"' />"];
    [MemeCanvas loadHTMLString:html baseURL:root];

    [picker dismissViewControllerAnimated:YES completion:^{}];
}

I am able to log the asset-library URL but it doesn't seem to be displayed the image on the UIWebView. I don't know what I need to change the baseURL to.

Any help appreciated.

Edit 2

I changed UIImagePickerControllerReferenceURL to UIImagePickerControllerMediaURL and now it crashes because it doesnt like it when i append it to a string with stringByAppendingString:urlString

It gives me the error:

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[__NSCFConstantString stringByAppendingString:]: nil argument'

Do you know what could be causing this?

[Updated to swift 4] You can use UIImagePickerController delegate to select the image (or url) you want to edit.

you can do this like this:

let pickerController = UIImagePickerController()
pickerController.sourceType = .photoLibrary
pickerController.delegate = self
self.navigationController?.present(pickerController, animated: true, completion: {
})

in the delegate implementation you can use the path of the image or the image itself:

// This method is called when an image has been chosen from the library or taken from the camera.

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {    
   //You can retrieve the actual UIImage
   let image = info[UIImagePickerControllerOriginalImage] as? UIImage
   //Or you can get the image url from AssetsLibrary
   let path = info[UIImagePickerControllerReferenceURL] as? URL
   picker.dismiss(animated: true, completion: nil)
}

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