IOS 富文本 ,设置行间距、字间距,计算高度(转载组合而成)
一 计算高度 -(CGFloat)getSpaceLabelHeight:(NSString*)str withFont:(UIFont*)font withWidth:(CGFloat)width { NSMutableParagraphStyle *paraStyle = [[NSMutableParagraphStylealloc] init]; paraStyle.lineBr
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
_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),
NSFontAttributeName: [UIFont systemFontOfSize:30] };
_label01.attributedText = [[NSAttributedString alloc] initWithString: originStr attributes: attrDict1];
NSDictionary *attrDict2 = @{ NSObliquenessAttributeName: @(0),
NSFontAttributeName: [UIFont systemFontOfSize:30] };
_label02.attributedText = [[NSAttributedString alloc] initWithString: originStr attributes: attrDict2];
NSDictionary *attrDict3 = @{ NSObliquenessAttributeName: @(0.8),
NSFontAttributeName: [UIFont systemFontOfSize:30] };
_label03.attributedText = [[NSAttributedString alloc] initWithString: originStr attributes: attrDict3];
运行结果:

15. NSExpansionAttributeName
//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
NSDictionary *attrDict1 = @{ NSExpansionAttributeName: @(-1),
NSFontAttributeName: [UIFont systemFontOfSize:20] };
_label01.attributedText = [[NSAttributedString alloc] initWithString: originStr attributes: attrDict1];
NSDictionary *attrDict2 = @{ NSExpansionAttributeName: @(0),
NSFontAttributeName: [UIFont systemFontOfSize:20] };
_label02.attributedText = [[NSAttributedString alloc] initWithString: originStr attributes: attrDict2];
NSDictionary *attrDict3 = @{ NSExpansionAttributeName: @(0.6),
NSFontAttributeName: [UIFont systemFontOfSize:20] };
_label03.attributedText = [[NSAttributedString alloc] initWithString: originStr attributes: attrDict3];
运行结果:

16. NSWritingDirectionAttributeName
//NSWritingDirectionAttributeName 设置文字书写方向,取值为以下组合
//@[@(NSWritingDirectionLeftToRight | NSTextWritingDirectionEmbedding)]
//@[@(NSWritingDirectionLeftToRight | NSTextWritingDirectionOverride)]
//@[@(NSWritingDirectionRightToLeft | NSTextWritingDirectionEmbedding)]
//@[@(NSWritingDirectionRightToLeft | NSTextWritingDirectionOverride)]
NSDictionary *attrDict1 = @{ NSWritingDirectionAttributeName: @[@(NSWritingDirectionLeftToRight | NSTextWritingDirectionEmbedding)],
NSFontAttributeName: [UIFont systemFontOfSize:20] };
_label01.attributedText = [[NSAttributedString alloc] initWithString: originStr attributes: attrDict1];
NSDictionary *attrDict2 = @{ NSWritingDirectionAttributeName: @[@(NSWritingDirectionRightToLeft | NSTextWritingDirectionOverride)],
NSFontAttributeName: [UIFont systemFontOfSize:20] };
_label02.attributedText = [[NSAttributedString alloc] initWithString: originStr attributes: attrDict2];
NSDictionary *attrDict3 = @{ NSWritingDirectionAttributeName: @[@(NSWritingDirectionLeftToRight | NSTextWritingDirectionOverride)],
NSFontAttributeName: [UIFont systemFontOfSize:20] };
_label03.attributedText = [[NSAttributedString alloc] initWithString: originStr attributes: attrDict3];
运行结果:

17. NSVerticalGlyphFormAttributeName
//NSVerticalGlyphFormAttributeName 设置文字排版防线,取值为 NSNumber 对象(整数),0 表示横排文本,1 表示竖排文本。
// 在 iOS 中,总是使用横排文本,0 以外的值都未定义
NSDictionary *attrDict1 = @{ NSVerticalGlyphFormAttributeName: @(-10),
NSFontAttributeName: [UIFont systemFontOfSize:20] };
_label01.attributedText = [[NSAttributedString alloc] initWithString: originStr attributes: attrDict1];
NSDictionary *attrDict2 = @{ NSVerticalGlyphFormAttributeName: @(0),
NSFontAttributeName: [UIFont systemFontOfSize:20] };
_label02.attributedText = [[NSAttributedString alloc] initWithString: originStr attributes: attrDict2];
NSDictionary *attrDict3 = @{ NSVerticalGlyphFormAttributeName: @(10),
NSFontAttributeName: [UIFont systemFontOfSize:20] };
_label03.attributedText = [[NSAttributedString alloc] initWithString: originStr attributes: attrDict3];运行结果:

18. NSLinkAttributeName
链接属性点击将启动浏览器打开一个URL地址,中间用到一个代理函数,UILabel 和 UITextField 无法使用该属性,所以只能用UITextView来做示例。
//NSLinkAttributeName 设置链接属性,点击后调用浏览器打开指定URL地址
NSDictionary *attrDict1 = @{ NSLinkAttributeName: [NSURL URLWithString: @"http://www.baidu.com"],
NSFontAttributeName: [UIFont systemFontOfSize:20] };
_textview01.editable = NO; //必须禁止输入,否则点击将弹出输入键盘
_textview01.scrollEnabled = NO; //可选
_textview01.delegate = self; //必须设置,否则代理函数不会被回调
_textview01.attributedText = [[NSAttributedString alloc] initWithString: originStr attributes: attrDict1];
代理函数:
- (BOOL)textView:(UITextView *)textView shouldInteractWithURL:(NSURL *)URL inRange:(NSRange)characterRange{
NSLog(@"textView is clicked...");
return YES;
}
运行结果:

点击UITextView中得“Hello,中秋节!”,即可打开浏览器

19. NSAttachmentAttributeName
//NSAttachmentAttributeName 设置文本附件,取值为NSTextAttachment对象,常用于文字图片混排
NSTextAttachment *textAttachment01 = [[NSTextAttachment alloc] init];
textAttachment01.image = [UIImage imageNamed: @"10000.jpeg"]; //设置图片源
textAttachment01.bounds = CGRectMake(0, 0, 30, 30); //设置图片位置和大小
NSMutableAttributedString *attrStr01 = [[NSMutableAttributedString alloc] initWithString: originStr];
[attrStr01 addAttribute: NSFontAttributeName value: [UIFont systemFontOfSize: 25] range: NSMakeRange(0, originStr.length)];
NSAttributedString *attrStr11 = [NSAttributedString attributedStringWithAttachment: textAttachment01];
[attrStr01 insertAttributedString: attrStr11 atIndex: 2]; //NSTextAttachment占用一个字符长度,插入后原字符串长度增加1
_label01.attributedText = attrStr01;
NSTextAttachment *textAttachment02 = [[NSTextAttachment alloc] init];
textAttachment02.image = [UIImage imageNamed: @"10000.jpeg"]; //设置图片源
textAttachment02.bounds = CGRectMake(0, -10, 30, 40); //设置图片位置和大小
NSMutableAttributedString *attrStr02 = [[NSMutableAttributedString alloc] initWithString: originStr];
[attrStr02 addAttribute: NSFontAttributeName value: [UIFont systemFontOfSize: 25] range: NSMakeRange(0, originStr.length)];
NSAttributedString *attrStr12 = [NSAttributedString attributedStringWithAttachment: textAttachment02];
[attrStr02 insertAttributedString: attrStr12 atIndex: 6];
_label02.attributedText = attrStr02;
NSTextAttachment *textAttachment03 = [[NSTextAttachment alloc] init];
textAttachment03.image = [UIImage imageNamed: @"10000.jpeg"]; //设置图片源
textAttachment03.bounds = CGRectMake(0, -6, 50, 30); //设置图片位置和大小
NSMutableAttributedString *attrStr03 = [[NSMutableAttributedString alloc] initWithString: originStr];
[attrStr03 addAttribute: NSFontAttributeName value: [UIFont systemFontOfSize: 25] range: NSMakeRange(0, originStr.length)];
NSAttributedString *attrStr13 = [NSAttributedString attributedStringWithAttachment: textAttachment03];
[attrStr03 insertAttributedString: attrStr13 atIndex: 8];
_label03.attributedText = attrStr03;
运行结果:

20. NSParagraphStyleAttributeName
设置文本段落排版格式,取值为 NSParagraphStyle/NSMutableParagraphStyle 对象,可以设置如下属性:
// alignment 对齐方式,取值枚举常量 NSTextAlignment // firstLineHeadIndent 首行缩进,取值 float // headIndent 缩进,取值 float // tailIndent 尾部缩进,取值 float // ineHeightMultiple 可变行高,乘因数,取值 float // maximumLineHeight 最大行高,取值 float // minimumLineHeight 最小行高,取值 float // lineSpacing 行距,取值 float // paragraphSpacing 段距,取值 float // paragraphSpacingBefore 段首空间,取值 float // // baseWritingDirection 句子方向,取值枚举常量 NSWritingDirection // lineBreakMode 断行方式,取值枚举常量 NSLineBreakMode // hyphenationFactor 连字符属性,取值 0 - 1
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