如何在 ios xamarin 的文本字段中禁用空格字符 [英] How to disable space character in a text field in ios xamarin

问题描述

我不想允许在显示名称字段中输入空格.

I don't want to allow to enter space in display name field.

例如，如果用户键入这样的名称名称"或名称"或名称"，则最终结果应该是名称"消除空格.

For example if the user types the name like this " Name" or " Name" or " Name ", the end result should be "Name" eliminating the spaces.

我尝试过这种方法，但修剪似乎不起作用.

I tried this approach but the trim doesn't seem to work.

NameText.EditingDidEnd += delegate {
            char[] arr = new char[] {' '};
            NameText.Text.TrimStart(arr);
            ScrollPageForKeyboard(false);
        };

推荐答案

我建议阻止用户实际输入空格，而不是在他们都准备好之后删除它.

I would suggest preventing the user from actually entering whitespace versus removing it after they all ready have.

添加一个 ShouldChangeCharacters 处理程序并检查它们是否在由 NSCharacterSet.WhitespaceAndNewlines

Add a ShouldChangeCharacters handler and check to see if they are entering any characters in the whitespace character set as defined by NSCharacterSet.WhitespaceAndNewlines

NameText.ShouldChangeCharacters += (UITextField textField, NSRange range, string replacementString) =>
{
    foreach (var aChar in replacementString)
    {
        if (NSCharacterSet.WhitespaceAndNewlines.Contains(aChar))
            return false;
    }
    return true;
};

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