iOS学习-给文字设置下划线

给字符串"目标就寝时间设置"添加下划线效果

NSMutableAttributedString *attrStr = [[NSMutableAttributedString alloc] initWithString:@"123456" attributes:@{NSUnderlineStyleAttributeName : @(NSUnderlineStyleSingle)}];
titleLabel.attributedText = attrStr;

只给字符串某一部分添加下划线效果

如：字符串"123456"，只给“456”添加下划线

NSMutableAttributedString *attrStr = [[NSMutableAttributedString alloc] initWithString:@"123456"];
[attrStr setAttributes:@{NSUnderlineStyleAttributeName : @(NSUnderlineStyleSingle)} range:NSMakeRange(3, 3)];
label.attributedText = attrStr;