当混合中有新行字符时，UITextView firstRectForRange无法正常工作 [英] UITextView firstRectForRange not working when there's new line characters in the mix

问题描述

我正在使用此方法将NSRange转换为CGRect，因为它与UITextView相关：

I'm using this method for converting a NSRange to a CGRect as it relates to a UITextView:

- (CGRect)frameOfTextRange:(NSRange)range inTextView:(UITextView *)textView
{
    UITextPosition *beginning = textView.beginningOfDocument;
    UITextPosition *start = [textView positionFromPosition:beginning offset:range.location];
    UITextPosition *end = [textView positionFromPosition:beginning offset:range.location+range.length];
    UITextRange *textRange = [textView textRangeFromPosition:start toPosition:end];
    CGRect rect = [textView firstRectForRange:textRange];
    return rect;
}

这个问题的回答让有人问我同样的问题。上述方法适用于此：

This question's answer has someone asking the same question as me. The above method works great for this:

这是一个很棒的文本字段是的，它是findthistoken

this is a great text field yes it is findthistoken

这样不太好：

this is a great one
(new line)
(new line)
findthistoken

似乎简单地忽略了有2个新行字符的事实？ ：/

It seems to simply ignore the fact that there are 2 new lines characters? :/

如何使用新行字符？

推荐答案

您可以强制self.textView立即确保textView的布局

You can force self.textView to ensure the layout of textView immediately with

 [self.textView.layoutManager ensureLayoutForTextContainer:self.textView.textContainer];

在你的frameOfTextRange：call之前放置它会给你正确的矩形。

Placing that before your frameOfTextRange: call will gives you right rect.

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