blocks|key|617237|text|您可能需要这样的自定义呈现器：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|617238|using+MonoTouch.UIKit;
using+Xamarin.Forms;
using+Xamarin.Forms.Platform.iOS;

[assembly:ExportRenderer(+typeof(NamespaceOfApp.MySearchBar),+typeof(NamespaceOfApp.iOS.SearchBarWithNoBarRenderer_iOS))]

namespace+NamespaceOfApp.iOS
{
++++public+class+SearchBarWithNoBarRenderer_iOS+:+SearchBarRenderer
++++{
++++++++protected+override+void+OnElementChanged(+ElementChangedEventArgs<SearchBar>+args+)
++++++++{
++++++++++++base.OnElementChanged(+args+);

++++++++++++UISearchBar+bar+=+(UISearchBar)this.Control;
++++++++++++//set+background+to+empty+image
++++++++++++bar.SetBackgroundImage+(new+UIImage+(),+UIBarPosition.TopAttached,+UIBarMetrics.Default);
++++++++}
++++}
}|code-block|syntax|javascript|617239|如果您需要帮助定制渲染器，请看这里|offset|length|617240|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.xamarin.com/guides/xamarin-forms/custom-renderer/introduction/^0|0|0|F|2|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@$I|V|J|W|1|X]]|A|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

Think you might need a custom renderer for this like so:

<pre><code>using MonoTouch.UIKit;
using Xamarin.Forms;
using Xamarin.Forms.Platform.iOS;

[assembly:ExportRenderer( typeof(NamespaceOfApp.MySearchBar), typeof(NamespaceOfApp.iOS.SearchBarWithNoBarRenderer_iOS))]

namespace NamespaceOfApp.iOS
{
 public class SearchBarWithNoBarRenderer_iOS : SearchBarRenderer
 {
 protected override void OnElementChanged( ElementChangedEventArgs&lt;SearchBar&gt; args )
 {
 base.OnElementChanged( args );

 UISearchBar bar = (UISearchBar)this.Control;
 //set background to empty image
 bar.SetBackgroundImage (new UIImage (), UIBarPosition.TopAttached, UIBarMetrics.Default);
 }
 }
}
</code></pre>

If you need a hand with custom renderers look <a href="https://developer.xamarin.com/guides/xamarin-forms/custom-renderer/introduction/" rel="nofollow">here</a>

blocks|key|713250|text|Forms+v2中引入了效果，作为扩展窗体基础控件的推荐方法。https://developer.xamarin.com/guides/xamarin-forms/effects/|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|713251|例如，这将是您的iOS效果代码..。|713252|using+Xamarin.Forms;
using+Xamarin.Forms.Platform.iOS;

[assembly:ResolutionGroupName+("MyCompany")]
[assembly:ExportEffect+(typeof(FocusEffect),+"FocusEffect")]
namespace+EffectsDemo.iOS
{
++++public+class+FocusEffect+:+PlatformEffect
++++{
++++++++protected+override+void+OnAttached+()
++++++++{
++++++++++++//+your+code+here++++++++
++++++++}

++++++++protected+override+void+OnDetached+()
++++++++{
++++++++++++//+your+code+here++++++++
++++++++}

++++++++protected+override+void+OnElementPropertyChanged+(PropertyChangedEventArgs+args)
++++++++{
++++++++++++base.OnElementPropertyChanged+(args);
++++++++++++//+your+code+here++++++++
++++++++}
++++}
}|code-block|syntax|javascript|713253|自定义呈现器是表单v1.x中的唯一选项。自定义渲染器很适合从头开始构建控件，但在扩展内置控件时却遇到了一些意外。|713254|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.xamarin.com/guides/xamarin-forms/effects/^0|V|1N|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@$A|V|B|W|1|X]]|C|$]]|$1|D|3|E|5|6|7|Y|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|Z|8|@]|9|@]|C|$I|J]]|$1|K|3|L|5|6|7|10|8|@]|9|@]|C|$]]|$1|M|3|-4|5|6|7|11|8|@]|9|@]|C|$]]]|N|$O|$5|P|Q|R|C|$S|T]]]]

Effects was introduced in Forms v2 as the recommended way to extending the Forms base controls. <a href="https://developer.xamarin.com/guides/xamarin-forms/effects/" rel="nofollow">https://developer.xamarin.com/guides/xamarin-forms/effects/</a>

For example; this would be your iOS Effect code...

<pre><code>using Xamarin.Forms;
using Xamarin.Forms.Platform.iOS;

[assembly:ResolutionGroupName ("MyCompany")]
[assembly:ExportEffect (typeof(FocusEffect), "FocusEffect")]
namespace EffectsDemo.iOS
{
 public class FocusEffect : PlatformEffect
 {
 protected override void OnAttached ()
 {
 // your code here 
 }

 protected override void OnDetached ()
 {
 // your code here 
 }

 protected override void OnElementPropertyChanged (PropertyChangedEventArgs args)
 {
 base.OnElementPropertyChanged (args);
 // your code here 
 }
 }
}
</code></pre>

Custom Renderers were the only option in Forms v1.x. Custom Renderers are great for building controls from scratch but it was a bit hit and miss when extending the built-in controls.

blocks|key|713273|text|使用StoryBoard：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|713274|​|713275|📷|atomic|offset|length|713276|713277|使用代码：|713278|public+override+void+ViewWillLayoutSubviews+()
++++++++{
++++++++++++base.ViewWillLayoutSubviews+();
++++++++++++sampleSearchBar.SearchBarStyle+=+UISearchBarStyle.Minimal;
++++++++++++sampleSearchBar.BarTintColor+=++UIColor.Clear;

++++++++}|code-block|syntax|javascript|713279|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://developer.qcloudimg.com/http-save/yehe-900000/841e3ed2d42f0c4032ef4c53e6c9e56b.png|imageAlt^0|0|0|0|1|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Z|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|10|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|11|8|@]|9|@$G|12|H|13|1|14]]|A|$]]|$1|I|3|C|5|6|7|15|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|16|8|@]|9|@]|A|$]]|$1|L|3|M|5|N|7|17|8|@]|9|@]|A|$O|P]]|$1|Q|3|-4|5|6|7|18|8|@]|9|@]|A|$]]]|R|$S|$5|T|U|V|A|$W|X|Y|-4]]]]

Using StoryBoard:

<a href="https://i.stack.imgur.com/06OkF.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/06OkF.png" alt="enter image description here"></a>

Using code:

<pre><code>public override void ViewWillLayoutSubviews ()
 {
 base.ViewWillLayoutSubviews ();
 sampleSearchBar.SearchBarStyle = UISearchBarStyle.Minimal;
 sampleSearchBar.BarTintColor = UIColor.Clear;

 }
</code></pre>

I am new to Xamarin.forms. I am using a SearchBar followed by a BoxView.

The problem that I am facing is removing the border line of the SearchBar. 

<a href="https://i.stack.imgur.com/A0G2B.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/A0G2B.png" alt="enter image description here"></a>

This border makes the UI appear as if there is a separator in between the SearchBar and the BoxView.

Any help in achieving this is much appreciated.

Thanks much :)

How to remove the border or border colour of the SearchBar?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我是Xamarin.forms的新手。我使用的是SearchBar，后面是BoxView。我面临的问题是移除SearchBar的边界线。​​这个边框使UI看起来好像在SearchBar和BoxView之间有一个分隔符。对实现这一点的任何帮助都是非常感谢的。非常感谢:)

问如何删除SearchBar的边框或边框颜色？
EN

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问如何删除SearchBar的边框或边框颜色？EN