如何从UILabel的第n行获取文本？ [英] How to get text from nth line of UILabel?

问题描述

是否有一种简单的方法可以获取（或简单显示）UILabel中给定行的文本？

Is there an easy way to get (or simply display) the text from a given line in a UILabel?

我的UILabel正确地显示我的文字并将其展示得很漂亮但偶尔我需要能够显示某些行但显然我需要知道UILabel如何定位所有内容要做到这一点。

My UILabel is correctly displaying my text and laying it out beautifully but occasionally I need to be able to just show certain lines but obviously I need to know how UILabel has positioned everything to do this.

我知道这可以通过子字符串轻松完成，但我需要知道该行的起点和终点。

I know this could easily be done with a substring but I'd need to know the start and end point of the line.

或者我可以滚动UILabel，如果UILabel的帧有某种偏移并隐藏我不想看到的其他内容。

Alternatively I could scroll the UILabel if there was some kind of offset to the UILabel's frame and hide the rest of the content I didn't want to see.

我无法发现任何显示如何轻松完成此操作的内容。有人有什么好主意吗？

I've not been able to uncover anything that shows how this could be done easily. Anyone got any good ideas?

谢谢

iphaaw

推荐答案

我不认为有这样的本地方式（如takethenline方法）。

我可以找出一个棘手的解决方案，但我我不确定是最好的。

您可以将标签拆分成一个单词数组。

然后你可以循环数组并检查文本高度，直到这个单词像这样：

I don't think there's a native way for doing this (like a "takethenline" method).
I can figure out a tricky solution but I'm not sure is the best one.
You could split your label into an array of words.
Then you could loop the array and check the text height until that word like this:

NSString *texttocheck;
float old_height = 0;
int linenumber = 0; 

for (x=0; x<[wordarray lenght]; x++) {
    texttocheck = [NSString stringWithFormat:@"%@ %@", texttocheck, [wordarray objectAtIndex:x]];

    float height = [text sizeWithFont:textLabel.font
                    constrainedToSize:CGSizeMake(textLabel.bounds.size.width,99999) 
                        lineBreakMode:UILineBreakModeWordWrap].height;

    if (old_height < height) {
        linenumber++;
    }
}

如果高度发生变化，则表示之前有换行符这个词。

我现在无法检查语法是否写得正确，所以你必须自己检查一下。

If height changes, it means there's a line break before the word.
I can't check if the syntax is written correctly now, so you have to check it yourself.

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