Xamarin形式:标签文本中的字母间距 [英] Xamarin Forms: Letter spacing in Label Text
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问题描述
我正在使用Xamarin表单PCL构建跨平台应用程序.在该应用中,我需要为标签文本添加字母间距. 标签文本字符之间需要空格.有没有办法为所有平台实现这一目标. Letterspacing属性在ANDROID中可用,但我需要适用于ios,uwp,win8/8.1等所有平台的解决方案.
Hi I am building an cross platform app using Xamarin forms PCL. In that app I need to add letter spacing to label text. I need space between label text characters. Is there any way to achieve this for all platforms. Letterspacing property is available in ANDROID but I need solution for all the platforms like ios, uwp, win8/8.1.
推荐答案
表单控件
public class LetterSpacingLabel : Label
{
public float LetterSpacing { get; set; }
}
Android渲染器代码如下:
public class LetterSpacingLabelRenderer : LabelRenderer
{
protected LetterSpacingLabel LetterSpacingLabel { get; private set; }
protected override void OnElementChanged(ElementChangedEventArgs<Label> e)
{
base.OnElementChanged(e);
if (e.OldElement == null)
{
this.LetterSpacingLabel = (LetterSpacingLabel)this.Element;
}
var letterSpacing = this.LetterSpacingLabel.LetterSpacing;
this.Control.LetterSpacing = letterSpacing;
this.UpdateLayout();
}
}
iOS渲染器
protected override void OnElementChanged(ElementChangedEventArgs<Label> e)
{
base.OnElementChanged(e);
var data = Element as LetterSpacingLabel;
if (data == null || Control == null)
{
return;
}
var text = Control.Text;
var attributedString = new NSMutableAttributedString(text);
var nsKern = new NSString("NSKern");
var spacing = NSObject.FromObject(data.LetterSpacing * 10);
var range = new NSRange(0, text.Length);
attributedString.AddAttribute(nsKern, spacing, range);
Control.AttributedText = attributedString;
}
下面的代码示例演示如何使用 LetterSpacingLabel 控件:
The following code example demonstrates using the LetterSpacingLabel control:
< LetterSpacingLabel LetterSpacing="0.5" Text="Lorem ipsum dolor sit amet" />
以下屏幕截图显示了 iOS
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