UILabel关键字标红和改变字体效果

• 效果如下图：

  
  
  

  1.png

• 代码如下
  UILabel *label = @"86易清洁/";
  NSMutableAttributedString *noteStr = [[NSMutableAttributedString alloc] initWithString: label.text];
  //设置平均分的字号
  NSRange purpleRange = NSMakeRange(0, [[noteStr string] rangeOfString:@"\n"].location);
  [noteStr addAttribute:NSFontAttributeName value:[UIFont fontWithName:@"Nexa Light" size:22] range:purpleRange];
  //设置\n后面label的颜色为灰色
  NSRange grayRange = NSMakeRange([[noteStr string] rangeOfString:@"\n"].location,[noteStr string].length-purpleRange.length);
  [noteStr addAttribute:NSForegroundColorAttributeName value:[UIColor grayColor] range:grayRange];
  [label setAttributedText:noteStr];

• 文字剪裁方式

NSLineBreakByWordWrapping = 0,//以空格为边界，保留单词
NSLineBreakByCharWrapping, //保留整个字符NSLineBreakByClipping, //简单剪裁，到边
界为止
NSLineBreakByTruncatingHead, //按照"……文字"显示
NSLineBreakByTruncatingTail, //按照"文字……文字"显示
NSLineBreakByTruncatingMiddle //按照"文字……"显示

• 设置对齐基线

UIBaselineAdjustmentAlignBaselines //文本最上端与Label中线对齐，默认值
UIBaselineAdjustmentAlignCenters //文本中线与Label中线对齐
UIBaselineAdjustmentNone //文本最下端与Label中线对齐

• 阴影

myLabel.shadowColor = [UIColor grayColor];//阴影颜色，默认为
nilmyLabel.shadowOffset = CGSizeMake(1, 1);//阴影的偏移点

• 计算UIlabel 随字体多行后的高度

CGRect result,bounds;bounds = CGRectMake(0, 0,200, 300);
heightLabel = [myLabel textRectForBounds:bounds limitedToNumberOfLines:20];//计算20行后的Label的Frame
NSLog(@"%f",heightLabel.size.height);