計算文字高度

• label

   //定義label
      self.titleLabel = [[UILabel alloc] init];
      NSMutableParagraphStyle *style = [[NSMutableParagraphStyle alloc] init];
          [style setLineSpacing:2];
          NSDictionary *dic = @{NSFontAttributeName:[UIFont fontWithName:@"PingFangSC-Light" size:14], NSParagraphStyleAttributeName:style};
          NSAttributedString *attributeStr = [[NSAttributedString alloc] initWithString:self.nameStr attributes:dic];
          self..titleLabel.attributedText = attributeStr;
          CGFloat height = [self getHeightLineWithString:self.nameStr withWidth:kScreenWidth - 30 withFont:[UIFont fontWithName:@"PingFangSC-Light" size:14]];
         self..titleLabel.frame =  CGRectMake(15, kNavgationHeight, kScreenWidth - 30, height);
   
  

• 根據字串計算label高度

  #pragma mark - 根據字串計算label高度
  - (CGFloat)getHeightLineWithString:(NSString *)string withWidth:(CGFloat)width withFont:(UIFont *)font {
  
        //1.1最大允許繪製的文字範圍
      CGSize size = CGSizeMake(width, 2000);
      //1.2配置計算時的行擷取方法,和contentLabel對應
      NSMutableParagraphStyle *style = [[NSMutableParagraphStyle alloc] init];
      [style setLineSpacing:2];
      //1.3配置計算時的字型的大小
      //1.4配置屬性字典
      NSDictionary *dic = @{NSFontAttributeName:font, NSParagraphStyleAttributeName:style};
      //2.計算
      //如果想保留多個列舉值,則列舉值中間加按位或|即可,並不是所有的列舉型別都可以按位或,只有列舉值的賦值中有左移運算子時才可以
      CGFloat height = [string boundingRectWithSize:size options:NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading attributes:dic context:nil].size.height;
      return height;
  }