NSString *text = @"守夜人誓言：「长夜将至，我从今开始守望，至死方休。我将不娶妻、不封地、不生子。我将不戴宝冠，不争荣宠。我将尽忠职守，生死於斯。我是黑暗中的利剑，长城上的守卫。我是抵御寒冷的烈焰，破晓时分的光线，唤醒眠者的号角，守护王国的坚盾。我将生命与荣耀献给守夜人，今夜如此，夜夜皆然。」";
//设置文本属性
NSMutableParagraphStyle *paraStyle = [[NSMutableParagraphStyle alloc]init];
//设置行间距
[paraStyle setLineSpacing:5];
[paraStyle setLineBreakMode:NSLineBreakByWordWrapping];
//字体大小
UIFont *textFont = [UIFont systemFontOfSize:15];
//字体颜色
UIColor *textColor = [UIColor lightGrayColor];
NSDictionary *textDic = @{NSFontAttributeName : textFont,NSForegroundColorAttributeName : textColor,NSParagraphStyleAttributeName : paraStyle};
//富文本
NSAttributedString *attrText = [[NSAttributedString alloc]initWithString:text attributes:textDic];
//计算文本的size
CGSize textSize = [text boundingRectWithSize:CGSizeMake([UIScreen mainScreen].bounds.size.width *0.5, MAXFLOAT) options:NSStringDrawingUsesLineFragmentOrigin attributes:textDic context:nil].size;
UILabel *textLabel = [[UILabel alloc]init];
textLabel.attributedText = attrText;
textLabel.numberOfLines = 0;
[self.view addSubview:textLabel];
//布局
[textLabel mas_makeConstraints:^(MASConstraintMaker *make) {
make.center.mas_equalTo(self.view);
make.width.mas_equalTo(ceil(textSize.width));//
make.height.mas_equalTo(ceil(textSize.height));
}];
//设置虚线边框
CAShapeLayer *borderLayer = [CAShapeLayer layer];
borderLayer.bounds = CGRectMake(0, 0, textSize.width + 10, textSize.height + 10);
//中心点位置
borderLayer.position = CGPointMake(textSize.width *0.5, textSize.height *0.5);
borderLayer.path = [UIBezierPath bezierPathWithRect:CGRectMake(0, 0, textSize.width + 10, textSize.height + 10)].CGPath;
//边框的宽度
borderLayer.lineWidth = 3;
//边框虚线线段的宽度
borderLayer.lineDashPattern = @[@5,@5];
borderLayer.fillColor = [UIColor clearColor].CGColor;
borderLayer.strokeColor = [UIColor purpleColor].CGColor;
[textLabel.layer addSublayer:borderLayer];
效果如下：
