如何在Facebook的“继续阅读”等文本末尾添加按钮？ [英] How to add button to the end of text like Facebook's "Continue reading"?

问题描述

当状态帖子太长时，Facebook应用程序会剪切文本并在最后添加继续阅读。它如何知道在哪里剪切文本并添加...继续阅读？

When a status post is too long, Facebook app cuts the text and adds "Continue Reading" at the end. How does it know where to cut the text and add "... Continue Reading"?

不只是向textView或label添加按钮，而是如何剪切字符串。
在下图中，例如，我将行数限制为7.我可以在textView或标签的右下角放置一个按钮，但它可能会重叠某些字符。

Not just adding a button to textView or label but how do I cut the string. In picture below, for example, I limited number of lines to 7. I could just place a button over lower right corner of the textView or label but it might be overlap some characters.

推荐答案

这应该可以帮助你：）

NSString *str=self.strQuestionTitle;

CGRect rect=CGRectMake(51, 16, 257, 0);

CGSize size=[str sizeWithFont:self.lblQuestion.font constrainedToSize:CGSizeMake(257, 3000) lineBreakMode:self.lblQuestion.lineBreakMode];
int lines=(size.height/self.lblQuestion.font.pointSize);
self.lblQuestion.numberOfLines=lines;
rect.size=size;
if(lines>2)
{
    if(lines==3 &&[str length]>66)
    {
        str=[str substringToIndex:66];
    str=[str stringByAppendingString:@"...Read More"];
    size=[str sizeWithFont:self.lblQuestion.font constrainedToSize:CGSizeMake(257, 67) lineBreakMode:self.lblQuestion.lineBreakMode];

    int lines=(size.height/self.lblQuestion.font.pointSize);
    self.lblQuestion.numberOfLines=lines;

    rect.size=CGSizeMake(257, 67);
    }
    else if(lines>3)
    {
        str=[str stringByAppendingString:@"...Read More"];
        size=[str sizeWithFont:self.lblQuestion.font constrainedToSize:CGSizeMake(257, 67) lineBreakMode:self.lblQuestion.lineBreakMode


              ];

        int lines=(size.height/self.lblQuestion.font.pointSize);
        self.lblQuestion.numberOfLines=lines;

        rect.size=CGSizeMake(257, 67);
    }

    //self.lblQuestion.lineBreakMode=NSLineBreakByTruncatingHead;
}

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