IOS 富文本 ,设置行间距字间距,计算高度(转载组合而成)

Posted z977690557

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一 计算高度 

-(CGFloat)getSpaceLabelHeight:(NSString*)str withFont:(UIFont*)font withWidth:(CGFloat)width

    NSMutableParagraphStyle *paraStyle = [[NSMutableParagraphStylealloc] init];

    paraStyle.lineBreakMode =NSLineBreakByCharWrapping;

    paraStyle.alignment =NSTextAlignmentLeft;

    /**行高 */

    paraStyle.lineSpacing =15;

    paraStyle.hyphenationFactor =1.0;

    paraStyle.firstLineHeadIndent =0.0;

    paraStyle.paragraphSpacingBefore =0.0;

    paraStyle.headIndent =0;

    paraStyle.tailIndent =0;

   NSDictionary *dic = @NSFontAttributeName:font,NSParagraphStyleAttributeName:paraStyle,NSKernAttributeName:@1.5f;

    CGSize size = [strboundingRectWithSize:CGSizeMake(width,height)options:NSStringDrawingUsesLineFragmentOriginattributes:diccontext:nil].size;

   return size.height;

二 label富文本 

与NSString类似,在ios中AttributedString也分为NSAttributedString和NSMutableAttributedString,不同的是,AttributedString对象多了一个Attribute的概念,一个AttributedString的对象包含很多的属性,每一个属性都有其对应的字符区域,在这里是使用NSRange来进行描述的。

    使用AttributedString的方式通常有两种:

方式一:

    首先初始化一个NSMutableAttributedString,然后向里面添加文字样式,最后将它赋给控件的AttributedText,该方法适合于文本较少而又需要分段精细控制的情况。

    NSString *originStr = @"Hello,中秋节!";
    
    //方式一
    
    //创建 NSMutableAttributedString
    NSMutableAttributedString *attributedStr01 = [[NSMutableAttributedString alloc] initWithString: originStr];
    
    //添加属性
    
    //给所有字符设置字体为Zapfino,字体高度为15像素
    [attributedStr01 addAttribute: NSFontAttributeName value: [UIFont fontWithName: @"Zapfino" size: 15]
                                                       range: NSMakeRange(0, originStr.length)];
    //分段控制,最开始4个字符颜色设置成蓝色
    [attributedStr01 addAttribute: NSForegroundColorAttributeName value: [UIColor blueColor] range: NSMakeRange(0, 4)];
    //分段控制,第5个字符开始的3个字符,即第5、6、7字符设置为红色
    [attributedStr01 addAttribute: NSForegroundColorAttributeName value: [UIColor redColor] range: NSMakeRange(4, 3)];
    
    //赋值给显示控件label01的 attributedText
    _label01.attributedText = attributedStr01;
运行结果:


方式二:

   首先创建属性字典,初始化各种属性,然后和需要控制的文本一起创建并赋值给控件的AttributedText,该方法适合于需要控制的文本较多整体控制的情况,通常是从文件中读取的大段文本控制。

    //方式二
    
    //创建属性字典
    NSDictionary *attrDict = @ NSFontAttributeName: [UIFont fontWithName: @"Zapfino" size: 15],
                                NSForegroundColorAttributeName: [UIColor blueColor] ;

    //创建 NSAttributedString 并赋值
    _label02.attributedText = [[NSAttributedString alloc] initWithString: originStr attributes: attrDict];

运行结果:

   

    通过对比两个例子可以看出,方式一比较容易处理复杂的格式,但是属性设置比较繁多复杂,而方式二的属性设置比较简单明了,却不善于处理复杂多样的格式控制,但是不善于并不等于不能,可以通过属性字符串分段的方式来达到方式一的效果,如下:

    //方式二的分段处理
    //第一段
    NSDictionary *attrDict1 = @ NSFontAttributeName: [UIFont fontWithName: @"Zapfino" size: 15],
                                 NSForegroundColorAttributeName: [UIColor blueColor] ;
    NSAttributedString *attrStr1 = [[NSAttributedString alloc] initWithString: [originStr substringWithRange: NSMakeRange(0, 4)] attributes: attrDict1];
    
    //第二段
    NSDictionary *attrDict2 = @ NSFontAttributeName: [UIFont fontWithName: @"Zapfino" size: 15],
                                 NSForegroundColorAttributeName: [UIColor redColor] ;
    NSAttributedString *attrStr2 = [[NSAttributedString alloc] initWithString: [originStr substringWithRange: NSMakeRange(4, 3)] attributes: attrDict2];
    
    //第三段
    NSDictionary *attrDict3 = @ NSFontAttributeName: [UIFont fontWithName: @"Zapfino" size: 15],
                                 NSForegroundColorAttributeName: [UIColor blackColor] ;
    NSAttributedString *attrStr3 = [[NSAttributedString alloc] initWithString: [originStr substringWithRange:
                                                                                NSMakeRange(7, originStr.length - 4 - 3)] attributes: attrDict3];
    //合并
    NSMutableAttributedString *attributedStr03 = [[NSMutableAttributedString alloc] initWithAttributedString: attrStr1];
    [attributedStr03 appendAttributedString: attrStr2];
    [attributedStr03 appendAttributedString: attrStr3];
    
    _label03.attributedText = attributedStr03;

运行结果:


    好了,讲完AttributedString的创建方式,下面研究下AttributedString究竟可以设置哪些属性,具体来说,有以下21个:

// NSFontAttributeName                设置字体属性,默认值:字体:Helvetica(Neue) 字号:12
// NSForegroundColorAttributeNam      设置字体颜色,取值为 UIColor对象,默认值为黑色
// NSBackgroundColorAttributeName     设置字体所在区域背景颜色,取值为 UIColor对象,默认值为nil, 透明色
// NSLigatureAttributeName            设置连体属性,取值为NSNumber 对象(整数),0 表示没有连体字符,1 表示使用默认的连体字符
// NSKernAttributeName                设定字符间距,取值为 NSNumber 对象(整数),正值间距加宽,负值间距变窄
// NSStrikethroughStyleAttributeName  设置删除线,取值为 NSNumber 对象(整数)
// NSStrikethroughColorAttributeName  设置删除线颜色,取值为 UIColor 对象,默认值为黑色
// NSUnderlineStyleAttributeName      设置下划线,取值为 NSNumber 对象(整数),枚举常量 NSUnderlineStyle中的值,与删除线类似
// NSUnderlineColorAttributeName      设置下划线颜色,取值为 UIColor 对象,默认值为黑色
// NSStrokeWidthAttributeName         设置笔画宽度,取值为 NSNumber 对象(整数),负值填充效果,正值中空效果
// NSStrokeColorAttributeName         填充部分颜色,不是字体颜色,取值为 UIColor 对象
// NSShadowAttributeName              设置阴影属性,取值为 NSShadow 对象
// NSTextEffectAttributeName          设置文本特殊效果,取值为 NSString 对象,目前只有图版印刷效果可用:
// NSBaselineOffsetAttributeName      设置基线偏移值,取值为 NSNumber (float),正值上偏,负值下偏
// NSObliquenessAttributeName         设置字形倾斜度,取值为 NSNumber (float),正值右倾,负值左倾
// NSExpansionAttributeName           设置文本横向拉伸属性,取值为 NSNumber (float),正值横向拉伸文本,负值横向压缩文本
// NSWritingDirectionAttributeName    设置文字书写方向,从左向右书写或者从右向左书写
// NSVerticalGlyphFormAttributeName   设置文字排版方向,取值为 NSNumber 对象(整数),0 表示横排文本,1 表示竖排文本
// NSLinkAttributeName                设置链接属性,点击后调用浏览器打开指定URL地址
// NSAttachmentAttributeName          设置文本附件,取值为NSTextAttachment对象,常用于文字图片混排
// NSParagraphStyleAttributeName      设置文本段落排版格式,取值为 NSParagraphStyle 对象
下面就一一举例说明:

1. NSFontAttributeName

    //NSForegroundColorAttributeName 设置字体颜色,取值为 UIColor,默认为黑色
    
    NSDictionary *attrDict1 = @ NSForegroundColorAttributeName: [UIColor redColor] ;
    NSDictionary *attrDict2 = @ NSForegroundColorAttributeName: [UIColor blueColor] ;
    NSDictionary *attrDict3 = @ NSForegroundColorAttributeName: [UIColor orangeColor] ;
    
    _label01.attributedText = [[NSAttributedString alloc] initWithString: originStr attributes: attrDict1];
    _label02.attributedText = [[NSAttributedString alloc] initWithString: originStr attributes: attrDict2];
    _label03.attributedText = [[NSAttributedString alloc] initWithString: originStr attributes: attrDict3];

运行结果:


注意:

    NSForegroundColorAttributeName设置的颜色与UILabel的textColor属性设置的颜色在地位上是相等的,谁最后赋值,最终显示的就是谁的颜色。

2. NSBackgroundColorAttributeName

    //NSForegroundColorAttributeName 设置字体颜色,取值为 UIColor,默认为黑色
    
    NSDictionary *attrDict1 = @ NSForegroundColorAttributeName: [UIColor redColor] ;
    NSDictionary *attrDict2 = @ NSForegroundColorAttributeName: [UIColor blueColor] ;
    NSDictionary *attrDict3 = @ NSForegroundColorAttributeName: [UIColor orangeColor] ;
    
    _label01.attributedText = [[NSAttributedString alloc] initWithString: originStr attributes: attrDict1];
    _label02.attributedText = [[NSAttributedString alloc] initWithString: originStr attributes: attrDict2];
    _label03.attributedText = [[NSAttributedString alloc] initWithString: originStr attributes: attrDict3];
     
    //NSBackgroundColorAttributeName 设置字体所在区域背景的颜色,取值为UIColor,默认值为nil
    
    NSDictionary *attrDict4 = @ NSBackgroundColorAttributeName: [UIColor orangeColor] ;
    NSDictionary *attrDict5 = @ NSBackgroundColorAttributeName: [UIColor redColor] ;
    NSDictionary *attrDict6 = @ NSBackgroundColorAttributeName: [UIColor cyanColor] ;
    
    _label01.attributedText = [[NSAttributedString alloc] initWithString: originStr attributes: attrDict4];
    _label02.attributedText = [[NSAttributedString alloc] initWithString: originStr attributes: attrDict5];
    _label03.attributedText = [[NSAttributedString alloc] initWithString: originStr attributes: attrDict6];

运行结果:


    仔细观察会发现个问题,我并没有关闭 NSForegroundColorAttributeName 属性,但是在运行结果中,所有字体的颜色都变成了默认色??黑色,这说明 NSForegroundColorAttributeName 和 NSBackgroundColorAttributeName 的低位是相等的,跟前面介绍的 textColor 一样,哪个属性最后一次赋值,就会冲掉前面的效果,若是我们把属性代码顺序交换以下

    //NSBackgroundColorAttributeName 设置字体所在区域背景的颜色,取值为UIColor,默认值为nil
    
    NSDictionary *attrDict4 = @ NSBackgroundColorAttributeName: [UIColor orangeColor] ;
    NSDictionary *attrDict5 = @ NSBackgroundColorAttributeName: [UIColor redColor] ;
    NSDictionary *attrDict6 = @ NSBackgroundColorAttributeName: [UIColor cyanColor] ;
    
    _label01.attributedText = [[NSAttributedString alloc] initWithString: originStr attributes: attrDict4];
    _label02.attributedText = [[NSAttributedString alloc] initWithString: originStr attributes: attrDict5];
    _label03.attributedText = [[NSAttributedString alloc] initWithString: originStr attributes: attrDict6];
    
    //NSForegroundColorAttributeName 设置字体颜色,取值为 UIColor,默认为黑色
    
    NSDictionary *attrDict1 = @ NSForegroundColorAttributeName: [UIColor redColor] ;
    NSDictionary *attrDict2 = @ NSForegroundColorAttributeName: [UIColor blueColor] ;
    NSDictionary *attrDict3 = @ NSForegroundColorAttributeName: [UIColor orangeColor] ;
    
    _label01.attributedText = [[NSAttributedString alloc] initWithString: originStr attributes: attrDict1];
    _label02.attributedText = [[NSAttributedString alloc] initWithString: originStr attributes: attrDict2];
    _label03.attributedText = [[NSAttributedString alloc] initWithString: originStr attributes: attrDict3];

运行结果:


但是textColor属性可以与 NSBackgroundColorAttributeName 属性叠加

[objc] view plain copy print ?
    _label01.textColor = [UIColor greenColor];
    _label02.textColor = [UIColor yellowColor];
    _label03.textColor = [UIColor blueColor];
    
    //NSForegroundColorAttributeName 设置字体颜色,取值为 UIColor,默认为黑色
    
    NSDictionary *attrDict1 = @ NSForegroundColorAttributeName: [UIColor redColor] ;
    NSDictionary *attrDict2 = @ NSForegroundColorAttributeName: [UIColor blueColor] ;
    NSDictionary *attrDict3 = @ NSForegroundColorAttributeName: [UIColor orangeColor] ;
    
    _label01.attributedText = [[NSAttributedString alloc] initWithString: originStr attributes: attrDict1];
    _label02.attributedText = [[NSAttributedString alloc] initWithString: originStr attributes: attrDict2];
    _label03.attributedText = [[NSAttributedString alloc] initWithString: originStr attributes: attrDict3];
  
    //NSBackgroundColorAttributeName 设置字体所在区域背景的颜色,取值为UIColor,默认值为nil
    
    NSDictionary *attrDict4 = @ NSBackgroundColorAttributeName: [UIColor orangeColor] ;
    NSDictionary *attrDict5 = @ NSBackgroundColorAttributeName: [UIColor redColor] ;
    NSDictionary *attrDict6 = @ NSBackgroundColorAttributeName: [UIColor cyanColor] ;
    
    _label01.attributedText = [[NSAttributedString alloc] initWithString: originStr attributes: attrDict4];
    _label02.attributedText = [[NSAttributedString alloc] initWithString: originStr attributes: attrDict5];
    _label03.attributedText = [[NSAttributedString alloc] initWithString: originStr attributes: attrDict6];

运行结果:


    虽然 textColor 在 NSFontAttributeName 之前赋值,但是由于 NSFontAttributeName 的属性效果被NSBackgroundColorAttributeName 属性冲掉了,所以最终显示了 textColor 的颜色。

3. NSLigatureAttributeName

    //NSLigatureAttributeName 设置连体属性,取值为NSNumber 对象(整数),0 表示没有连体字符,1 表示使用默认的连体字符,
    //                        2 表示使用所有连体符号,默认值为 1(iOS 不支持 2)
    
    NSString *ligatureStr = @"flush";
    
    NSDictionary *attrDict1 = @ NSLigatureAttributeName: [NSNumber numberWithInt: 0],
                                 NSFontAttributeName: [UIFont fontWithName: @"futura" size: 30] ;
    _label01.attributedText = [[NSAttributedString alloc] initWithString: ligatureStr attributes: attrDict1];
    
    NSDictionary *attrDict2 = @ NSLigatureAttributeName: @(1),
                                 NSFontAttributeName: [UIFont fontWithName: @"futura" size: 30] 
                                 ;
    _label02.attributedText = [[NSAttributedString alloc] initWithString: ligatureStr attributes: attrDict2];

    由于要展示连体字符,所以将前面使用的带有中文的字符串换成 flush

    NSLigatureAttributeName的取值为NSNumber对象,所以不能直接将一个整数值赋给它,创建 NSNumber 对象的方法有很多,或者可以简写成 @(int)

运行结果:


    注意观察字母f和l之间的变化。

    感觉连写就是一个艺术字功能,当字符f和l组合使用组合符号(所谓的字形(glyph))绘制时,看起来确实更加美观。但是并非所有的字符之间都有组合符号,事实上,只有某些字体中得某些字符的组合(如字符f和l,字符f和i等)才具有美观的组合符号。

4. NSKernAttributeName

    //NSKernAttributeName 设定字符间距,取值为 NSNumber 对象(整数),正值间距加宽,负值间距变窄
    NSDictionary *attrDict1 = @ NSKernAttributeName: @(-3),
                                 NSFontAttributeName: [UIFont systemFontOfSize: 20]
                                 ;
    _label01.attributedText = [[NSAttributedString alloc] initWithString: originStr attributes: attrDict1];  
    NSDictionary *attrDict2 = @ NSKernAttributeName: @(0),
                                 NSFontAttributeName: [UIFont systemFontOfSize: 20]
                                 ;
    _label02.attributedText = [[NSAttributedString alloc] initWithString: originStr attributes: attrDict2];
    NSDictionary *attrDict3 = @ NSKernAttributeName: @(10),
                                 NSFontAttributeName: [UIFont systemFontOfSize: 20]
                                 ;
    _label03.attributedText = [[NSAttributedString alloc] initWithString: originStr attributes: attrDict3];

运行结果:


5. NSStrikethroughStyleAttributeName

    //NSStrikethroughStyleAttributeName 设置删除线,取值为 NSNumber 对象(整数),枚举常量 NSUnderlineStyle中的值
    // NSUnderlineStyleNone   不设置删除线
    // NSUnderlineStyleSingle 设置删除线为细单实线
    // NSUnderlineStyleThick  设置删除线为粗单实线
    // NSUnderlineStyleDouble 设置删除线为细双实线   
    NSDictionary *attrDict1 = @ NSStrikethroughStyleAttributeName: @(NSUnderlineStyleSingle),
                                NSFontAttributeName: [UIFont systemFontOfSize:20] ;
    _label01.attributedText = [[NSAttributedString alloc] initWithString: originStr attributes: attrDict1];  
    NSDictionary *attrDict2 = @ NSStrikethroughStyleAttributeName: @(NSUnderlineStyleThick),
                                 NSFontAttributeName: [UIFont systemFontOfSize:20] ;
    _label02.attributedText = [[NSAttributedString alloc] initWithString: originStr attributes: attrDict2];
       
    NSDictionary *attrDict3 = @ NSStrikethroughStyleAttributeName: @(NSUnderlineStyleDouble),
                                 NSFontAttributeName: [UIFont systemFontOfSize:20] ;
    _label03.attributedText = [[NSAttributedString alloc] initWithString: originStr attributes: attrDict3];

注意:

    虽然使用了枚举常量,但是枚举常量的本质仍为整数,所以同样必须先转化为 NSNumber 才能使用

    删除线和下划线使用相同的枚举常量作为其属性值

    目前iOS中只有上面列出的4中效果,虽然我们能够在头文件中发现其他更多的取值,但是使用后没有任何效果

运行结果:


可以看出,中文和英文删除线的位置有所不同

    另外,删除线属性取值除了上面的4种外,其实还可以取其他整数值,有兴趣的可以自行试验,取值为 0 - 7时,效果为单实线,随着值得增加,单实线逐渐变粗,取值为 9 - 15时,效果为双实线,取值越大,双实线越粗。

    NSDictionary *attrDict1 = @ NSStrikethroughStyleAttributeName: @(1),
                                 NSFontAttributeName: [UIFont systemFontOfSize:20] ;
    _label01.attributedText = [[NSAttributedString alloc] initWithString: originStr attributes: attrDict1];
    
    
    NSDictionary *attrDict2 = @ NSStrikethroughStyleAttributeName: @(3),
                                 NSFontAttributeName: [UIFont systemFontOfSize:20] ;
    _label02.attributedText = [[NSAttributedString alloc] initWithString: originStr attributes: attrDict2];
    
    
    NSDictionary *attrDict3 = @ NSStrikethroughStyleAttributeName: @(7),
                                 NSFontAttributeName: [UIFont systemFontOfSize:20] ;
    _label03.attributedText = [[NSAttributedString alloc] initWithString: originStr attributes: attrDict3];

运行结果:


6. NSStrikethroughColorAttributeName                  

    //NSStrikethroughColorAttributeName 设置删除线颜色,取值为 UIColor 对象,默认值为黑色   
    NSDictionary *attrDict1 = @ NSStrikethroughColorAttributeName: [UIColor blueColor],
                                 NSStrikethroughStyleAttributeName: @(1),
                                 NSFontAttributeName: [UIFont systemFontOfSize:20] ;
    _label01.attributedText = [[NSAttributedString alloc] initWithString: originStr attributes: attrDict1];      
    NSDictionary *attrDict2 = @ NSStrikethroughColorAttributeName: [UIColor orangeColor],
                                 NSStrikethroughStyleAttributeName: @(3),
                                 NSFontAttributeName: [UIFont systemFontOfSize:20] ;
    _label02.attributedText = [[NSAttributedString alloc] initWithString: originStr attributes: attrDict2];
    
    NSDictionary *attrDict3 = @ NSStrikethroughColorAttributeName: [UIColor greenColor],
                                 NSStrikethroughStyleAttributeName: @(7),
                                 NSFontAttributeName: [UIFont systemFontOfSize:20] ;
    _label03.attributedText = [[NSAttributedString alloc] initWithString: originStr attributes: attrDict3];

运行结果:


7. NSUnderlineStyleAttributeName  

下划线除了线条位置和删除线不同外,其他的都可以完全参照删除线设置。

    //NSUnderlineStyleAttributeName 设置下划线,取值为 NSNumber 对象(整数),枚举常量 NSUnderlineStyle中的值,与删除线类似  
    NSDictionary *attrDict1 = @ NSUnderlineStyleAttributeName: @(NSUnderlineStyleSingle),
                                 NSFontAttributeName: [UIFont systemFontOfSize:20] ;
    _label01.attributedText = [[NSAttributedString alloc] initWithString: originStr attributes: attrDict1];
       
    NSDictionary *attrDict2 = @ NSUnderlineStyleAttributeName: @(NSUnderlineStyleThick),
                                 NSFontAttributeName: [UIFont systemFontOfSize:20] ;
    _label02.attributedText = [[NSAttributedString alloc] initWithString: originStr attributes: attrDict2];
        
    NSDictionary *attrDict3 = @ NSUnderlineStyleAttributeName: @(NSUnderlineStyleDouble),
                                 NSFontAttributeName: [UIFont systemFontOfSize:20] ;
    _label03.attributedText = [[NSAttributedString alloc] initWithString: originStr attributes: attrDict3];

运行结果:


8. NSUnderlineColorAttributeName

可以完全参照下划线颜色设置

    //NSUnderlineColorAttributeName 设置下划线颜色,取值为 UIColor 对象,默认值为黑色
    
    NSDictionary *attrDict1 = @ NSUnderlineColorAttributeName: [UIColor blueColor],
                                 NSUnderlineStyleAttributeName: @(NSUnderlineStyleSingle),
                                 NSFontAttributeName: [UIFont systemFontOfSize:20] ;
    _label01.attributedText = [[NSAttributedString alloc] initWithString: originStr attributes: attrDict1];
    
    
    NSDictionary *attrDict2 = @ NSUnderlineColorAttributeName: [UIColor orangeColor],
                                 NSUnderlineStyleAttributeName: @(NSUnderlineStyleThick),
                                 NSFontAttributeName: [UIFont systemFontOfSize:20] ;
    _label02.attributedText = [[NSAttributedString alloc] initWithString: originStr attributes: attrDict2];
    
    
    NSDictionary *attrDict3 = @ NSUnderlineColorAttributeName: [UIColor greenColor],
                                 NSUnderlineStyleAttributeName: @(NSUnderlineStyleDouble),
                                 NSFontAttributeName: [UIFont systemFontOfSize:20] ;
    _label03.attributedText = [[NSAttributedString alloc] initWithString: originStr attributes: attrDict3];

运行结果:


9. NSStrokeWidthAttributeName

    //NSStrokeWidthAttributeName 设置笔画宽度,取值为 NSNumber 对象(整数),负值填充效果,正值中空效果
    
    NSDictionary *attrDict1 = @ NSStrokeWidthAttributeName: @(-3),
                                 NSFontAttributeName: [UIFont systemFontOfSize:30] ;
    _label01.attributedText = [[NSAttributedString alloc] initWithString: originStr attributes: attrDict1];
       
    NSDictionary *attrDict2 = @ NSStrokeWidthAttributeName: @(0),
                                 NSFontAttributeName: [UIFont systemFontOfSize:30] ;
    _label02.attributedText = [[NSAttributedString alloc] initWithString: originStr attributes: attrDict2];    
    
    NSDictionary *attrDict3 = @ NSStrokeWidthAttributeName: @(3),
                                 NSFontAttributeName: [UIFont systemFontOfSize:30] ;
    _label03.attributedText = [[NSAttributedString alloc] initWithString: originStr attributes: attrDict3];

运行结果:


10. NSStrokeColorAttributeName

    //NSStrokeColorAttributeName 填充部分颜色,不是字体颜色,取值为 UIColor 对象
    
    NSDictionary *attrDict1 = @ NSStrokeWidthAttributeName: @(-3),
                                 NSStrokeColorAttributeName: [UIColor orangeColor],
                                 NSFontAttributeName: [UIFont systemFontOfSize:30] ;
    _label01.attributedText = [[NSAttributedString alloc] initWithString: originStr attributes: attrDict1];
        
    NSDictionary *attrDict2 = @ NSStrokeWidthAttributeName: @(0),
                                 NSStrokeColorAttributeName: [UIColor blueColor],
                                 NSFontAttributeName: [UIFont systemFontOfSize:30] ;
    _label02.attributedText = [[NSAttributedString alloc] initWithString: originStr attributes: attrDict2];
        
    NSDictionary *attrDict3 = @ NSStrokeWidthAttributeName: @(3),
                                 NSStrokeColorAttributeName: [UIColor greenColor],
                                 NSFontAttributeName: [UIFont systemFontOfSize:30] ;
    _label03.attributedText = [[NSAttributedString alloc] initWithString: originStr attributes: attrDict3];
运行结果:


我们并没有设置字体的颜色,所以所有字体颜色应该是黑色,上图清晰的表明了 StrokeColor 的作用范围。
11. NSShadowAttributeName

    //NSShadowAttributeName 设置阴影属性,取值为 NSShadow 对象
    
    NSShadow *shadow1 = [[NSShadow alloc] init];  //NSShadow 对象比较简单,只有3个属性:阴影颜色,模糊半径和偏移
    shadow1.shadowOffset = CGSizeMake(3, 3);      //阴影偏移(X方向偏移和Y方向偏移)
    shadow1.shadowBlurRadius = 0.5;               //模糊半径
    shadow1.shadowColor = [UIColor orangeColor];  //阴影颜色
    
    NSShadow *shadow2 = [[NSShadow alloc] init];
    shadow2.shadowOffset = CGSizeMake(3, 16);
    shadow2.shadowBlurRadius = 2.5;
    shadow2.shadowColor = [UIColor purpleColor];
    
    NSShadow *shadow3 = [[NSShadow alloc] init];
    shadow3.shadowOffset = CGSizeMake(16, 3);
    shadow3.shadowBlurRadius = 4.0;
    shadow3.shadowColor = [UIColor blueColor];
    
    NSDictionary *attrDict1 = @ NSShadowAttributeName: shadow1,
                                 NSFontAttributeName: [UIFont systemFontOfSize:20] ;
    _label01.attributedText = [[NSAttributedString alloc] initWithString: originStr attributes: attrDict1];
    

    NSDictionary *attrDict2 = @ NSShadowAttributeName: shadow2,
                                 NSFontAttributeName: [UIFont systemFontOfSize:20] ;
    _label02.attributedText = [[NSAttributedString alloc] initWithString: originStr attributes: attrDict2];
    
    NSDictionary *attrDict3 = @ NSShadowAttributeName: shadow3,
                                 NSFontAttributeName: [UIFont systemFontOfSize:20] ;
    _label03.attributedText = [[NSAttributedString alloc] initWithString: originStr attributes: attrDict3];

运行结果:


12. NSTextEffectAttributeName

    //NSTextEffectAttributeName 设置文本特殊效果,取值为 NSString 对象,目前只有一个可用的特效:
    //                          NSTextEffectLetterpressStyle(凸版印刷效果),适用于iOS 7.0及以上
   
    NSDictionary *attrDict1 = @ NSTextEffectAttributeName: NSTextEffectLetterpressStyle,
                                 NSForegroundColorAttributeName: [UIColor grayColor],
                                 NSFontAttributeName: [UIFont systemFontOfSize:30] ;
    _label01.attributedText = [[NSAttributedString alloc] initWithString: originStr attributes: attrDict1];
    
    
    NSDictionary *attrDict2 = @ //NSTextEffectAttributeName: NSTextEffectLetterpressStyle,
                                 NSForegroundColorAttributeName: [UIColor grayColor],
                                 NSFontAttributeName: [UIFont systemFontOfSize:30] ;
    _label02.attributedText = [[NSAttributedString alloc] initWithString: originStr attributes: attrDict2];
    
    NSDictionary *attrDict3 = @ NSTextEffectAttributeName: NSTextEffectLetterpressStyle,
                                 NSForegroundColorAttributeName: [UIColor blueColor],
                                 NSFontAttributeName: [UIFont systemFontOfSize:30] ;
    _label03.attributedText = [[NSAttributedString alloc] initWithString: originStr attributes: attrDict3];
运行结果:


仔细对比label01和label02的文字显示效果

13. NSBaselineOffsetAttributeName

    //NSBaselineOffsetAttributeName 设置基线偏移值,取值为 NSNumber (float),正值上偏,负值下偏
    
    NSDictionary *attrDict1 = @ NSBaselineOffsetAttributeName: @(-10),
                                 NSFontAttributeName: [UIFont systemFontOfSize:20] ;
    _label01.attributedText = [[NSAttributedString alloc] initWithString: originStr attributes: attrDict1];
    
    
    NSDictionary *attrDict2 = @ NSBaselineOffsetAttributeName: @(0),
                                NSFontAttributeName: [UIFont systemFontOfSize:20] ;
    _label02.attributedText = [[NSAttributedString alloc] initWithString: originStr attributes: attrDict2];
    
    NSDictionary *attrDict3 = @ NSBaselineOffsetAttributeName: @(10),
                                 NSFontAttributeName: [UIFont systemFontOfSize:20] ;
    _label03.attributedText = [[NSAttributedString alloc] initWithString: originStr attributes: attrDict3];

运行结果:

14. NSObliquenessAttributeName

    //NSObliquenessAttributeName 设置字形倾斜度,取值为 NSNumber (float),正值右倾,负值左倾
    
    NSDictionary *attrDict1 = @ NSObliquenessAttributeName: @(-0.5),
                   

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