Label后展示“全文”按钮-ios

借助YYText很好实现的

NSMutableAttributedString *yytext = [[NSMutableAttributedString alloc]initWithString:model.message];

    yytext.yy_font = 15;

    yytext.yy_lineSpacing=5;

    yytext.yy_color = [UIColor grayColor];

    _yylab.numberOfLines = 2;

    _yylab.attributedText = yytext;

    [_yylab.attributedText addSeeMoreButton:_yylab more:@"全文" moreColor:JHMaincolor before:@"..." tapAction:nil];

NSAttributedString的扩展 #import "NSAttributedString+utils.h"

- (NSAttributedString*)addSeeMoreButton:(YYLabel*)label  more:(NSString*)more moreColor:(UIColor*)morecolor before:(NSString*)before tapAction:(void(^)(UIView*containerView,NSAttributedString*text,NSRangerange,CGRectrect))tapAction{

    NSMutableAttributedString *text = [[NSMutableAttributedString alloc] initWithString:[NSString stringWithFormat:@"%@%@",before? before:@"",more ? more :@""]];

    if(tapAction) {

        YYTextHighlight *hi = [YYTextHighlight new];

        [hi setColor:self.yy_color?self.yy_color:label.textColor];

        hi.tapAction= tapAction;

        [text yy_setTextHighlight:hirange:[text.stringrangeOfString:more]];

    }

    [text yy_setColor: morecolor ? morecolor: [UIColorcolorWithRed:0.000green:0.449blue:1.000alpha:1.000]range:[text.stringrangeOfString:more]];

    text.yy_font =self.yy_font ? self.yy_font :label.font;

    YYLabel*seeMore = [[YYLabelalloc]init];

    seeMore.attributedText= text;

    [seeMoresizeToFit];

    NSAttributedString *truncationToken = [NSAttributedString yy_attachmentStringWithContent:seeMore contentMode:UIViewContentModeCenter attachmentSize:seeMore.frame.size alignToFont:text.yy_font alignment:YYTextVerticalAlignmentCenter];

    label.truncationToken= truncationToken;

    return truncationToken;

}

最终效果：

效果图