Question

我想在UIAlertView消息中突出显示一些字词，或者通过粗体显示，或者通过下划线。

let message = "This is normal text.\nBold Title:\n This is normal text"

let alert = UIAlertView(title: "Title", message: message, delegate: self, cancelButtonTitle: "Cancel", otherButtonTitles: "OK")

alert.show()

我怎样才能制作＆＃34; Bold Title＆＃34;消息中加粗（或下划线）？

Answer 1

这就是我使用UILabel的accessoryView并在Alert中添加它所做的事情。在这句话中，单词YES将以粗体显示。

UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"Title for your alert" message:@"" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
            UILabel *lbl = [[UILabel alloc]initWithFrame:CGRectMake(0,0, 900, 900)];
            lbl.numberOfLines=1;
            lbl.adjustsFontSizeToFitWidth = YES;
            NSMutableAttributedString *attributedStr = [[NSMutableAttributedString alloc]initWithString:@"Please press Yes"];
            [attributedStr addAttribute:NSFontAttributeName value:[UIFont fontWithName:@"Helvetica-Bold" size:20.0] range:NSMakeRange(13,3)];
            lbl.attributedText = attributedStr;
            lbl.textAlignment = NSTextAlignmentCenter;
            [alert setValue:lbl forKey:@"accessoryView"];
            [alert show];

Answer 2

目前这是不可能的，因为UIAlertView API不支持属性字符串，这将是您完成此类事情的正常方式。

Answer 3

UIAlertView无法更改。如果您想修改它，您需要从头开始创建自己的。

请阅读： UIAlertView Class Reference

The UIAlertView class is intended to be used as-is and does not support subclassing. The view hierarchy for this class is private and must not be modified.

也许你应该去UIAlertController，支持编辑。

Answer 4

Onur Keskin问道，Xamarin的代码正在做OP所要求的。基本上Subin的答案被转换了：

var message = "This is normal text.\n<b>Bold Title:</b>\n This is normal text\n<b>Bold 1:</b> bold 1 text\n";

var b_open = "<b>";
var b_close = "</b>";
var boldSpots = new List<NSRange>();
var boldCount = (message.Length - message.Replace(b_open, "").Length) / b_open.Length;
for (int i = 0; i < boldCount; i++)
{
    var startBold = message.IndexOf(b_open);
    var endBold = message.IndexOf(b_close);
    message = message.Remove(startBold, b_open.Length).Remove(endBold - b_close.Length + 1, b_close.Length);
    boldSpots.Add(new NSRange(startBold, endBold - startBold - b_close.Length + 1));
}
var attrString = new NSMutableAttributedString(message);
boldSpots.ForEach(nsRange => attrString.AddAttribute(UIStringAttributeKey.Font, UIFont.FromName(ConfigurationProvider.FocoBold, 16), nsRange));

var lines = message.Length - message.Replace(@"\n", "").Length;

UILabel lbl = new UILabel(new CGRect(0, 0, 1, 1))
{
    Lines = lines,
    AdjustsFontSizeToFitWidth = true,
    AttributedText = attrString,
    TextAlignment = UITextAlignment.Center
};

var alert = new UIAlertView
{
    Title = "My Title"
};

alert.SetValueForKey(lbl, new NSString("accessoryView"));

alert.AddButton("OK");
alert.Clicked += (s, e) => {
    //OK Clicked
};
alert.Show();

Answer 5

它不是与alertView一起使用，而是与AlertViewController一起使用，这是显示粗体文本的方式

let alertController = UIAlertController(title: "", message: "", preferredStyle: .alert)

let attributedText = NSMutableAttributedString(string: "Bold text", attributes: [NSAttributedString.Key.font: UIFont.systemFont(ofSize: 14, weight: .semibold)])
alertController.setValue(message, forKey: "attributedMessage")

controller.present(alertController, animated: true, completion: nil)

在UIAlertView中突出显示单词？（粗体文字）

5 个答案:

在UIAlertView中突出显示单词？ （粗体文字）

5 个答案:

在UIAlertView中突出显示单词？（粗体文字）