NSString *text = @"守夜人誓言：「長夜將至，我從今開始守望，至死方休。我將不娶妻、不封地、不生子。我將不戴寶冠，不爭榮寵。我將盡忠職守，生死於斯。我是黑暗中的利劍，長城上的守衛。我是抵御寒冷的烈焰，破曉時分的光線，喚醒眠者的號角，守護王國的堅盾。我將生命與榮耀獻給守夜人，今夜如此，夜夜皆然。」";

//設置文本屬性

NSMutableParagraphStyle *paraStyle = [[NSMutableParagraphStyle alloc]init];

//設置行間距

[paraStyle setLineSpacing:5];

[paraStyle setLineBreakMode:NSLineBreakByWordWrapping];

//字體大小

UIFont *textFont = [UIFont systemFontOfSize:15];

//字體顏色

UIColor *textColor = [UIColor lightGrayColor];

NSDictionary *textDic = @{NSFontAttributeName : textFont,NSForegroundColorAttributeName : textColor,NSParagraphStyleAttributeName : paraStyle};

//富文本

NSAttributedString *attrText = [[NSAttributedString alloc]initWithString:text attributes:textDic];

//計算文本的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));

}];

//設置虛線邊框

CAShapeLayer *borderLayer = [CAShapeLayer layer];

borderLayer.bounds = CGRectMake(0, 0, textSize.width + 10, textSize.height + 10);

//中心點位置

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;

//邊框的寬度

borderLayer.lineWidth = 3;

//邊框虛線線段的寬度

borderLayer.lineDashPattern = @[@5,@5];

borderLayer.fillColor = [UIColor clearColor].CGColor;

borderLayer.strokeColor = [UIColor purpleColor].CGColor;

[textLabel.layer addSublayer:borderLayer];

效果如下：