html - iOS- 拉取 HTML id 以在 UIImageView 中显示图像

Question

我需要能够从我的网站中提取下面的 HTML 行，并在 Storyboard 中的 imageView 中显示图像。我已经有一些关于如何从同一网站提取文本的代码，我可以使用类似另一段代码的代码吗？当然，如果没有条纹部分，那只是得到纯文本。我只会加载图像的链接，但图像会根据播放的歌曲而变化。我想尝试避免只在 UIWebView 中显示图像，我更喜欢在 UIImageView 中显示它

HTML 代码:

<div id="album_cover"> 
<img height="160px" width="160px" id="imgcover" src="Link to image changed based on the song playing" alt="Loading..."></div>

objective-c 代码:

-(void)viewDidLoad {
    self.urlForLink = @"http://cloudrad.io/pointzeroradio/player";
    NSURL *myURL = [NSURL URLWithString: [self.urlForLink stringByAddingPercentEscapesUsingEncoding: NSUTF8StringEncoding]];
    NSURLRequest *request = [NSURLRequest requestWithURL:myURL];
    [webViewForRecents loadRequest:request];

    timer = [NSTimer scheduledTimerWithTimeInterval:0.01 target:self selector:@selector(recentTracksText) userInfo:nil repeats:YES];

}

-(void)recentTracksText {

NSString *textForBlog = [webViewForRecents stringByEvaluatingJavaScriptFromString:@"document.getElementById('current_song').textContent;"];

// Add this step for stripping the HTML from the text you received
self.strippedTextForBlog = [self stringByStrippingHTMLFromString:textForBlog];

continuousLabel.text = self.strippedTextForBlog;


}

基于 Elio.d 的回答。这对我来说非常有用，加载时间从 30 秒到 3 分钟不等。如果有人有一种可以快速加载的方法。

-(void)getImageCover {

    NSString * js      = @"document.getElementById('imgcover').src;";
    NSString * imgLink = [webViewForRecents stringByEvaluatingJavaScriptFromString:js];
    NSURL    * imgURL  = [NSURL URLWithString:imgLink];

    dispatch_queue_t exampleQueue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0);
    dispatch_async(exampleQueue, ^{

        NSData  * imgData = [NSData dataWithContentsOfURL:imgURL];
        UIImage * image   = [UIImage imageWithData:imgData];
        dispatch_queue_t queue = dispatch_get_main_queue();
        dispatch_async(queue, ^{

            [imageView setImage:image];

        });
    });
}

Answer 1

我想你的 div 只包含一个图像

如果是这样，这就是您可以实现的方式:

-(void)getImageCover {
   NSString * js      = @"document.getElementById("imgcover").src;"
   NSString * imgLink = [webViewForRecents stringByEvaluatingString:js];
   NSURL    * imgURL  = [NSURL urlWithString:imgLink];

   dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), ^{
     NSData  * imgData = [NSData dataWithContentsOfURL:imgURL];
     UIImage * image   = [UIImage imageWithData:imageData];
     dispatch_async(dispatch_get_main_queue(),{
       [imageView setImage:image];
     });
   });
}