针对UITableViewCell的NSTextAttachment加载映像异步

在异步线程或图像缓存库（如SDwebimage）中动态加载图像。下面的代码是我尝试过的，并且在从网络获取图像后不会重新绘制。针对UITableViewCell的NSTextAttachment加载映像异步

let mutableAttributedString = NSMutableAttributedString() 

    if let _img = newsItem.img { 
     var attachment = NSTextAttachment() 
     attachment.bounds = CGRectMake(4, 4, expectedWidth, expectedWidth * _img.ratio) 

     dispatch_async(dispatch_get_main_queue(), {() -> Void in 
      attachment.image = UIImage(data: NSData(contentsOfURL: NSURL(string: _img.src)!)!) 
     }) 

     mutableAttributedString.appendAttributedString(NSAttributedString(attachment: attachment)) 
    }

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2015-01-31 com.iavian

你，你知道如何解决它的范围是多少？我有同样的问题。 – HusseinB 2015-04-29 07:26:31

的NSTextAttachmentimage设置后，您需要强制的textView内容令人耳目一新。对于您可以使用textView.layoutManager's方法invalidateDisplayCharacterRange，其中range - 是您NSTextAttachement串

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2015-06-26 12:47:44 KaterinaPetrova

你有我的upvote。感谢您指点我正确的方向。 -setNeedsDisplay为我工作。仅供参考，我使用的是UILabel。 – 2016-07-05 07:55:55

@PrinceiPhone嗨，你可以在这里分享你的代码，我不是很清楚。 – Raniys 2016-10-26 01:27:19

@Raniys我发布了我的代码 – 2016-10-26 06:35:01

@Raniys我使用

NSTextAttachment *attachment = [[NSTextAttachment alloc] init]; 


       dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0ul); 


       dispatch_async(queue, ^{ 


        NSURL *url = [NSURL URLWithString:[[NSString stringWithFormat:@"%@%@", [ServerURL stringByReplacingOccurrencesOfString:@"/api" withString:@""], iconsArr[i][@"icon"]] stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]]; 


        SDWebImageManager *manager = [SDWebImageManager sharedManager]; 


        [manager downloadImageWithURL:url options:0 progress:NULL completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, BOOL finished, NSURL *imageURL) { 


         attachment.image = image; 


         [cell.descL setNeedsDisplay]; 
        }]; 
       }); 


       attachment.bounds = CGRectMake(0, -3, 12, 12); 


       NSAttributedString *attachmentString = [NSAttributedString attributedStringWithAttachment:attachment]; 


       NSMutableAttributedString *myString = [[NSMutableAttributedString alloc] initWithAttributedString:attachmentString]; 


       NSAttributedString *myText = [[NSMutableAttributedString alloc] initWithString:[NSString stringWithFormat:@" %@ \n", iconsArr[i][@"title"]]]; 


       [myString appendAttributedString:myText]; 


       [descStr appendAttributedString:myString];

来源

2016-10-26 06:32:19

非常感谢你，你是我的超级男人 – Raniys 2016-10-27 09:29:02

高兴地帮助:) – 2016-10-28 09:59:16

针对UITableViewCell的NSTextAttachment加载映像异步

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