Loading images dynamically in async thread or image cache library like SDwebimage. Below code is what I tried and it doesn't repaint after image fetched from network.
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))
}
After image
of NSTextAttachment
was set, you need to force refreshing of textView
contents. For that you can use textView.layoutManager's
method invalidateDisplayCharacterRange
, where range
- is the range of your NSTextAttachement substring
您可以使用这个来显示带有属性字符串的远程图像: https : //github.com/namanhams/RemoteImageTextAttachment
@Raniys I am using
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];
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