cordova 不允许加载本地资源：file:///var/mobile/Containers/Data/Application/03F63826-7849-47C3-A6DF-E1EB1113FF0A/Documents/xxx.png

mmvthczy 于 2022-11-15 发布在其他

关注(0)|答案(1)|浏览(5146)

X代码10.1
第12.0.1版
我使用wkwebview的函数“evaluateJavaScript”来回调图像url，并让wkwebview可以显示该图像。
在模拟器上成功运行。
但它的设备出现故障。
这有什么不对？
模拟器url是不错的工作：
file:///Users/xxxxxx/Library/Developer/CoreSimulator/Devices/8FB6E110-F30F-425D-9011-A196E78BE7CB/data/Containers/Data/Application/E122A32D-7E21-4EBA-A9E7-BC15E8468A11/Documents/20190409150915.png
设备URL失败：
不允许加载本地资源：file:///var/mobile/Containers/Data/Application/03F63826-7849-47C3-A6DF-E1EB1113FF0A/Documents/20190408203417.png

NSArray *imagesArray = [[NSArray alloc] initWithArray:[[NSUserDefaults standardUserDefaults] objectForKey:@"pickerImages"]];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];    
NSString *filePath = [NSString stringWithFormat:@"file://%@/",documentsDirectory];
NSString *imagesString = pickerImagesArray.firstObject;
NSString *jscript = @"";

if ([imagesString isEqualToString:@""])
    {
        jscript = [NSString stringWithFormat:@"getimage_cb('%@')" ,  @""];
    } else {
        NSString  *output = [NSString stringWithFormat:@"%@%@",filePath,imagesString];
        jscript = [NSString stringWithFormat:@"%@", [NSString stringWithFormat:@"getimage_cb('%@')" ,  output]];
    }

    [self.myWkwebView evaluateJavaScript:jscript completionHandler:^(id object, NSError * _Nullable error) {
    }];

cordova

来源：https://stackoverflow.com/questions/55587622/not-allowed-to-load-local-resource-file-var-mobile-containers-data-applicati

1条答案

按热度按时间

qyswt5oh1#

关于这一特定主题，在SO上有相互矛盾的答案。
我所了解到的是，您可以直接从应用程序包中加载图像，但不能从其文档目录中加载。
一种可能的解决方法是将图像加载到UIImage示例中，将其转换为base64并将其传递给evaluateJavascript方法：

NSArray *imagesArray = [[NSArray alloc] initWithArray:[[NSUserDefaults standardUserDefaults] objectForKey:@"pickerImages"]];
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];    
    NSString *imagesString = [pickerImagesArray firstObject];
    NSString *filePath = [NSString stringWithFormat:@"%@/%@", documentsDirectory, imagesString];

    //Init UIImage Instance
    UIImage *uiImageInstance = [[UIImage alloc] initWithContentsOfFile:filePath];

    //Get PNG Representation as NSData
    NSData *data = UIImagePNGRepresentation(uiImageInstance);

    //Convert to Base64
    NSString *base64Str = [data base64EncodedStringWithOptions:NSDataBase64Encoding64CharacterLineLength];

    //Construct the attribute value we'll pass in the javascript
    NSString *attribute = [NSString stringWithFormat: @"data:image/png;base64,%@", base64Str];

    //Set the image within the webview
    [self.myWkwebView evaluateJavascript: [NSString stringWithFormat: @"document.getElementById('img').setAttribute( 'src', %@);", attribute] completionHandler:^(id object, NSError * _Nullable error) {}];

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cordova 不允许加载本地资源：file:///var/mobile/Containers/Data/Application/03F63826-7849-47C3-A6DF-E1EB1113FF0A/Documents/xxx.png

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