ios - 带有 NSAttributedString(s) 的简单 UIAlertView

Question

我正在寻找一种简单的方法来使用 NSAttributedString 和一个非常简单的消息框，类似于:

NSString *new_item = [NSString stringWithFormat:@"<span style=\"font-family: Helvetica Neue; font-size: 12.0\">%@</span>", @"MOTD HTML String downloaded from website"];
NSAttributedString * attrStr = [[NSAttributedString alloc] initWithData:[new_item dataUsingEncoding:NSUnicodeStringEncoding] options:@{ NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType } documentAttributes:nil error:nil];
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"MOTD"
                                                   message:attrStr
                                                  delegate:nil
                                         cancelButtonTitle:@"OK"
                                         otherButtonTitles:nil];
[alert show];

我上面的代码采用从服务器下载的 HTML 格式的字符串，确保文本大小适合屏幕，然后尝试将 NSAttributedString 发送到 UIAlertView。但是 UIAlertView 不喜欢这样。解决这个问题的最简单方法是什么？(非 HTML 格式的 MOTD 不是一个选项)

Answer 1

将您的属性字符串添加到标签并将其添加为 assessoryView 以提醒

UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"Test Attributed String" message:@"" delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:nil, nil];
UILabel *lbl = [[UILabel alloc]initWithFrame:CGRectMake(0, 0, 100, 100)];
NSMutableAttributedString *attributedStr = [[NSMutableAttributedString alloc]initWithString:@"Hello red"];
[attributedStr addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:NSMakeRange(0,5)];
lbl.attributedText = attributedStr;
lbl.textAlignment = NSTextAlignmentCenter;
[alert setValue:lbl forKey:@"accessoryView"];
[alert show];

现在 UIAlertView 被弃用了。您可以使用 UIAlertController。