字体属性设置示例：
if(color ==nil) {
color = [NSColor redColor];
}
NSFont *font = button.font;
NSMutableParagraphStyle *centredStyle = [[NSParagraphStyle defaultParagraphStyle] mutableCopy];
[centredStyle setAlignment:NSCenterTextAlignment];
NSDictionary * attrs = [NSDictionary dictionaryWithObjectsAndKeys:font,
NSFontAttributeName,
color,
NSForegroundColorAttributeName,
centredStyle,
NSParagraphStyleAttributeName,
nil];
NSAttributedString * attributedString = [[NSAttributedString alloc]initWithString:[button title] attributes:attrs];
[button setAttributedTitle:attributedString];
以下为参数的设定
// NSFontAttributeName 设置字体属性，默认值：字体：Helvetica(Neue) 字号：12
//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];
// NSForegroundColorAttributeNam 设置字体颜色，取值为 UIColor对象，默认值为黑色
//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颜色，取值为 UIColor对象，默认值为nil, 透明色
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 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
// 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
//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)
// 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];
// NSStrikethroughStyleAttributeName 设置删除线，取值为 NSNumber 对象（整数）
//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];
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
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
// 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];
// 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];
// 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];
// 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];
// 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];
// 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];
// 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：
//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];
// 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];
// 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];
// 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];
// NSWritingDirectionAttributeName 设置文字书写方向，从左向右书写或者从右向左书写
//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];
// 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
//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];
// NSLinkAttributeName 设置链接属性，点击后调用浏览器打开指定URL地址
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。
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; }
// 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;
// NSParagraphStyleAttributeName 设置文本段落排版格式，取值为 NSParagraphStyle 对象
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
enum {
NSTextAlignmentLeft = 0,
NSTextAlignmentCenter = 1,
NSTextAlignmentRight = 2,
NSTextAlignmentJustified = 3,
NSTextAlignmentNatural = 4,};
// firstLineHeadIndent 首行缩进，取值 float
// headIndent 缩进，取值 float
// tailIndent 尾部缩进，取值 float 注意距离是从行首算起
// lineHeightMultiple 可变行高,乘因数，取值 float // maximumLineHeight 最大行高，取值 float
行高倍数因子，大于1行高变小，小于1行高变小，实际上字体大小不会改变，改变的时行间距
// minimumLineHeight 最小行高，取值 float
// manimumLineHeight 最大行高，取值 float
最大行高，若其值小于默认行高，则行间距变小，若其值大于默认行高，则不会引起任何变化
最小行高，若其值大于默认行高，则行间距变大，若其值小于默认行高，则不会引起任何变化
// lineSpacing 行距，取值 float
行距，取值为 float，可正可负，正值增加行距，负值减小行距
// paragraphSpacing 段距，取值 float 负值无效，取0值
// paragraphSpacingBefore 段首空间，取值 float
//baseWritingDirection 句子方向，取值枚举常量 NSWritingDirection
enum {
NSWritingDirectionNatural = -1,
NSWritingDirectionLeftToRight = 0,
NSWritingDirectionRightToLeft = 1 };
// lineBreakMode 断行方式，取值枚举常量 NSLineBreakMode
enum {
NSLineBreakByWordWrapping = 0, //自动换行，单词切断
NSLineBreakByCharWrapping, //自动换行，字母切断
NSLineBreakByClipping, //非自动换行，不切断
NSLineBreakByTruncatingHead, //非自动换行，行首切断
NSLineBreakByTruncatingTail, //非自动换行，行尾切断
NSLineBreakByTruncatingMiddle //非自动换行，中间切断 };
// hyphenationFactor 连字符属性，取值 0 - 1
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