如何在 iOS cordova 项目中将资产 url 从目标 C 返回到 javascript？答案

【问题标题】：How to return an asset url from objective C to javascript in iOS cordova project?如何在 iOS cordova 项目中将资产 url 从目标 C 返回到 javascript？
【发布时间】：2014-07-21 07:03:07
【问题描述】：

我正在为 ios 尝试一个 cordova 项目。我的日志中有一个资产 url，我尝试在我的代码中使用该 url，它工作正常。但是，我需要该资产 URL 作为从目标 C 到 javascript 的返回值。

- (void)saveImageDataToLibrary:(CDVInvokedUrlCommand*)command{
    self.callbackId = command.callbackId;
    NSData* imageData = [NSData dataFromBase64String:[command.arguments objectAtIndex:0]];

    UIImage* image = [[[UIImage alloc] initWithData:imageData] autorelease];

    UIImageWriteToSavedPhotosAlbum(image, self, @selector(image:didFinishSavingWithError:contextInfo:), nil);

    UIImage *viewImage = image;  // --- mine was made from drawing context
    ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];
    // Request to save the image to camera roll
    [library writeImageToSavedPhotosAlbum:[viewImage CGImage] orientation:(ALAssetOrientation)[viewImage imageOrientation] completionBlock:^(NSURL *assetURL, NSError *error){
        if (error) {
            NSLog(@"error");
        } else {
        NSLog(@"url %@", assetURL);
        }
    }];
    [library release];
}

- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo{
    // Was there an error?
    if (error != NULL)
    {
        // Show error message...
        NSLog(@"ERROR: %@",error);
        CDVPluginResult* result = [CDVPluginResult resultWithStatus: CDVCommandStatus_ERROR messageAsString:error.description];
        [self.webView stringByEvaluatingJavaScriptFromString:[result toErrorCallbackString: self.callbackId]];
    }
    else  // No errors
    {
        // Show message image successfully saved
        NSLog(@"IMAGE SAVED!");
        CDVPluginResult* result = [CDVPluginResult resultWithStatus: CDVCommandStatus_OK messageAsString:@"Image saved"];
    [self.webView stringByEvaluatingJavaScriptFromString:[result toSuccessCallbackString: self.callbackId]];
    }
}

这里.... 这段代码给了我日志....

NSLog(@"url %@", assetURL);

我想将此 assetURL 作为我的 javascript 的返回值，在哪里调用此函数...

我在这里呆了一个星期......

帮我解脱...

提前谢谢.....

【问题讨论】：

标签： javascript ios objective-c cordova alassetslibrary

【解决方案1】：

谢谢所有尝试过这个的人......经过一些搜索后我得到了...... 我已经在上面显示的代码中的那个NSLog行之后添加了代码......如下......

NSLog(@"url %@", assetURL);
        CDVPluginResult* result = [CDVPluginResult resultWithStatus: CDVCommandStatus_OK messageAsString:[assetURL absoluteString]];
        [self.webView stringByEvaluatingJavaScriptFromString:[result toSuccessCallbackString: self.callbackId]];

【讨论】：