Question

我需要显示一条警告，其中部分消息以斜体显示，另一部分正常，如下所示：

var title = "Title";
var body = "This part in Italic. This part normal.";
Application.Current.MainPage.DisplayAlert(title, body, "OK");

部分说：＆＃34;这部分用斜体字。＆＃34;斜体和正常文本中的另一个。

有可能吗？如果是，怎么样？

提前致谢！

Answer 1

我最终创建了一个像这样的原生警报控制器：

void PromptRichTextPopup(string title, string richMessage, string normalMessage, Action onOkCallback, Action onCancel = null) {
            var vc = UIKit.UIApplication.SharedApplication.KeyWindow.RootViewController;
            // take top presented view controller
            while (vc.PresentedViewController != null) {
                vc = vc.PresentedViewController;
            }

            var alertvc = UIAlertController.Create(title, string.Empty, UIAlertControllerStyle.Alert);
            var leftAligned = new NSMutableParagraphStyle();
            leftAligned.Alignment = UITextAlignment.Left;

            var colorTitle = new NSAttributedString(str: title, font: UIFont.BoldSystemFontOfSize(18), foregroundColor: Xamarin.Forms.Color.FromHex("#61acad").ToUIColor());

            alertvc.SetValueForKey(colorTitle, new NSString("attributedTitle"));

            var margin = 5f;
            var height = 30f;
            var width = 256f;

            var container = new UIView(new CGRect(margin, margin, width, height * 4));

            var message = new NSMutableAttributedString(str: richMessage, font: UIFont.ItalicSystemFontOfSize(14), foregroundColor: UIColor.Black);
            message.Append(new NSMutableAttributedString(str: " " + normalMessage, font: UIFont.SystemFontOfSize(14), foregroundColor: UIColor.Black));
            var lblText = new UILabel(new CGRect(0, -(height / 2), width, height * 2)) { AttributedText = message };
            lblText.LineBreakMode = UILineBreakMode.WordWrap;
            lblText.Lines = 0;
            container.AddSubview(lblText);

            var cancel = new UIButton(new CGRect(0, height, width / 2, height * 2));
            cancel.SetTitle("NO", UIControlState.Normal);
            cancel.AddTarget((sender, e) => alertvc.DismissViewController(true, null), UIControlEvent.TouchUpInside);
            cancel.SetTitleColor(UIColor.Blue, UIControlState.Normal);
            if (onCancel != null) {
                cancel.AddTarget((sender, e) => {
                    onCancel();
                },
                UIControlEvent.TouchUpInside);
            }
            container.AddSubview(cancel);

            var ok = new UIButton(new CGRect(width / 2, height, width / 2, height * 2));
            ok.SetTitle("YES", UIControlState.Normal);
            Action okAction = async () => {
                ok.Enabled = false;
                await uiHelper.RunBlocking(() => {
                    onOkCallback();
                });
                alertvc.DismissViewController(true, null);
            };
            ok.SetTitleColor(UIColor.Blue, UIControlState.Normal);
            container.AddSubview(ok);
            ok.AddTarget((sender, e) => {
                okAction();
            }, UIControlEvent.TouchUpInside);

            var controller = new UIViewController();
            controller.View.AddSubview(container);
            alertvc.SetValueForKey(controller, new NSString("contentViewController"));
            vc.PresentViewController(alertvc, true, null);
        }

Answer 2

您可以尝试使用自定义渲染器来实现（使用自定义视图和渲染器来处理弹出窗口）但boost/multiprecision/cpp_bin_float.hpp

警报传达与状态有关的重要信息您的应用或设备，并经常请求反馈。警报包括标题，可选消息，一个或多个按钮和可选项用于收集输入的文本字段。除了这些可配置元素，警报的视觉外观是静态的，不可能定制

it is not recommended by iOS可能对您有所帮助。

Xamarin.Forms - 具有Italic字体属性的DisplayAlert

2 个答案: