限制UITextview的行数 [英] Limit the number of lines for UITextview

问题描述

我想知道如何限制用户在编辑UITextField时可以输入的LINES（而不是其他问题中的字符）。

I was wondering how to limit the amount of LINES (not characters as asked in other questions) a user can enter when editing a UITextField.

理想情况下，喜欢将输入限制为最大。 10行。

Ideally, I would like to limit the input to max. 10 lines.

我需要在哪里开始？我使用方法这样做吗？在

Where would I need to start? Do I do this with a method? In

 - (BOOL)textViewShouldBeginEditing:(UITextView *)aTextView

推荐答案

你有正确的想法，但是错误的方法。 textView：shouldChangeTextInRange：replacementText：在文本将要更改时调用;您可以使用其文本属性访问文本视图的当前内容，并且可以从传递的范围和替换文本构建新内容 [ textView.text stringByReplacingCharactersInRange：range withString：replacementText] 。然后，您可以计算行数，并返回YES以允许更改，否则NO拒绝它。

You have the right idea, but the wrong method. textView:shouldChangeTextInRange:replacementText: is called whenever the text is going to change; you can access the current content of the text view using its text property, and you can construct the new content from the passed range and replacement text with [textView.text stringByReplacingCharactersInRange:range withString:replacementText]. You can then count the number of lines and return YES to allow the change or NO to reject it.

这篇关于限制UITextview的行数的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！