设置 UITextField 的光标位置 [英] Setting cursor position of UITextField

问题描述

我查看了单点触控示例并尝试了:

I´ve looked at the monotouch samples and tried:

var range = new NSRange(selectionStart, 1);
NumberTextField.SelectedTextRange = IndexedRange.GetRange(range);

但是这会在运行时导致这个异常:抛出Objective-C异常.名称:NSInvalidArgumentException 原因:-[iOS_IndexedRange asRange]:无法识别的选择器发送到实例 0x7d9bd690

But this causes this exception at runtime: Objective-C exception thrown. Name: NSInvalidArgumentException Reason: -[iOS_IndexedRange asRange]: unrecognized selector sent to instance 0x7d9bd690

我也看了很多 Objective-c 版本，但我不知道如何在单点触控上做它们.

I also looked at a lot of objective-c versions but i cant figure out how to do them on monotouch.

推荐答案

Ruben Macias 在 Xamarin 论坛上帮助了我.

Ruben Macias over at the Xamarin forums helped me.

entryField.BecomeFirstResponder();
var indexToSet = 3; //set cursor after the 3rd letter
var positionToSet = entryField.GetPosition(entryField.BeginningOfDocument, indexToSet);
entryField.SelectedTextRange = entryField.GetTextRange(positionToSet, positionToSet);

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