转自：http://www.tuicool.com/articles/QZ3If2
//学习内容
/*
1.控件 UIView UILabel UITextField UITextView UIButton
2.字体、大小、单位、颜色
*/
UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(10, 30, 300, 260)];
label.text = @"Label Text Content, This is a text label things attribute";//默认为空
label.font = [UIFont systemFontOfSize:17];//默认使用系统的17
label.textColor = [UIColor orangeColor];//默认使用文本黑色
label.shadowColor = [UIColor lightGrayColor];//默认没有阴影
label.shadowOffset = CGSizeMake(1,0);//默认是一个向上的阴影(0,-1)
label.textAlignment = NSTextAlignmentCenter;//默认是左对齐
label.lineBreakMode = NSLineBreakByTruncatingTail;//段落样式，默认是最后截断尾巴，用...代替
//富文本的基本数据类型，属性字符串。以此为基础，如果这个设置了相应的属性，则会忽略上面设置的属性，默认为空
NSString *string = label.text;
const CGFloat fontSize = 16.0;
NSMutableAttributedString *attrString = [[NSMutableAttributedString alloc] initWithString:string];
NSUInteger length = [string length];
//设置字体
UIFont *baseFont = [UIFont systemFontOfSize:fontSize];
[attrString addAttribute:NSFontAttributeName value:baseFont range:NSMakeRange(0, length)];//设置所有的字体
UIFont *boldFont = [UIFont boldSystemFontOfSize:fontSize];
[attrString addAttribute:NSFontAttributeName value:boldFont range:[string rangeOfString:@"Text"]];//设置Text这四个字母的字体为粗体
//设置倾斜，需要导入coreText
UIFont *italicFont = GetVariationOfFontWithTrait(baseFont,
kCTFontTraitItalic);
[attrString addAttribute:NSFontAttributeName value:italicFont
range:[string rangeOfString:@"Label"]];
// 设置颜色
UIColor *color = [UIColor redColor];
[attrString addAttribute:NSForegroundColorAttributeName
value:color
range:[string rangeOfString:@"Content"]];
[attrString addAttribute:NSBackgroundColorAttributeName value:[UIColor blueColor] range:[string rangeOfString:@"ent"]];
//可以对这些属性设置值
//字体名称有以下：
// label.font = [UIFont fontWithName:@"Arial-BoldItalicMT" size:24];
[attrString addAttribute:NSFontAttributeName value:[UIFont fontWithName:@"Verdana-BoldItalic" size:18] range:[string rangeOfString:@"Label"]];
label.numberOfLines = 2;
NSMutableParagraphStyle *
style = [[NSParagraphStyle defaultParagraphStyle] mutableCopy];
style.lineSpacing = 10;//增加行高
style.headIndent = 10;//头部缩进，相当于左padding
style.tailIndent = -10;//相当于右padding
style.lineHeightMultiple = 1.5;//行间距是多少倍
style.alignment = NSTextAlignmentLeft;//对齐方式
style.firstLineHeadIndent = 20;//首行头缩进
style.paragraphSpacing = 10;//段落后面的间距
style.paragraphSpacingBefore = 20;//段落之前的间距
[attrString addAttribute:NSParagraphStyleAttributeName value:style range:NSMakeRange(0, length)];
[attrString addAttribute:NSKernAttributeName value:@2 range:NSMakeRange(0, length)];//字符间距 2pt
[attrString addAttribute:NSStrokeColorAttributeName value:[UIColor blueColor] range:[string rangeOfString:@"is"]];//设置文字描边颜色，需要和NSStrokeWidthAttributeName设置描边宽度，这样就能使文字空心
[attrString addAttribute:NSStrokeWidthAttributeName value:@2 range:[string rangeOfString:@"is"]];//空心字，文字边框描述
[attrString addAttribute:NSUnderlineStyleAttributeName value:@(NSUnderlineStyleSingle) range:[string rangeOfString:@"text"]];//下划线
[attrString addAttribute:NSUnderlineStyleAttributeName value:@(NSUnderlineStyleThick) range:[string rangeOfString:@"label"]];//厚的下划线
[attrString addAttribute:NSStrikethroughStyleAttributeName value:@(NSUnderlinePatternSolid | NSUnderlineStyleSingle) range:[string rangeOfString:@"things"]];//删除线
[attrString addAttribute:NSStrikethroughColorAttributeName value:[UIColor blueColor] range:[string rangeOfString:@"things"]];//删除线蓝色
label.attributedText = attrString;
label.highlightedTextColor = [UIColor redColor];//设置文本高亮显示颜色，与highlighted一起使用。
label.highlighted = NO; //高亮状态是否打开
label.enabled = YES;//设置文字内容是否可变
label.userInteractionEnabled = YES;//设置标签是否忽略或移除用户交互。默认为NO
label.baselineAdjustment = UIBaselineAdjustmentNone;//如果adjustsFontSizeToFitWidth属性设置为YES，这个属性就来控制文本基线的行为。
// UIBaselineAdjustmentAlignBaselines=0，默认，文本最上端与中线对齐。
// UIBaselineAdjustmentAlignCenters, 文本中线与label中线对齐。
// UIBaselineAdjustmentNone, 文本最低端与label中线对齐。;
[self.view addSubview:label];
/*
字体名如下：
Font Family: American Typewriter
Font: AmericanTypewriter
Font: AmericanTypewriter-Bold
Font Family: AppleGothic
Font: AppleGothic
Font Family: Arial
Font: ArialMT
Font: Arial-BoldMT
Font: Arial-BoldItalicMT
Font: Arial-ItalicMT
Font Family: Arial Rounded MT Bold
Font: ArialRoundedMTBold
Font Family: Arial Unicode MS
Font: ArialUnicodeMS
Font Family: Courier
Font: Courier
Font: Courier-BoldOblique
Font: Courier-Oblique
Font: Courier-Bold
Font Family: Courier New
Font: CourierNewPS-BoldMT
Font: CourierNewPS-ItalicMT
Font: CourierNewPS-BoldItalicMT
Font: CourierNewPSMT
Font Family: DB LCD Temp
Font: DBLCDTempBlack
Font Family: Georgia
Font: Georgia-Bold
Font: Georgia
Font: Georgia-BoldItalic
Font: Georgia-Italic
Font Family: Helvetica
Font: Helvetica-Oblique
Font: Helvetica-BoldOblique
Font: Helvetica
Font: Helvetica-Bold
Font Family: Helvetica Neue
Font: HelveticaNeue
Font: HelveticaNeue-Bold
Font Family: Hiragino Kaku Gothic **** W3
Font: HiraKakuProN-W3
Font Family: Hiragino Kaku Gothic **** W6
Font: HiraKakuProN-W6
Font Family: Marker Felt
Font: MarkerFelt-Thin
Font Family: STHeiti J
Font: STHeitiJ-Medium
Font: STHeitiJ-Light
Font Family: STHeiti K
Font: STHeitiK-Medium
Font: STHeitiK-Light
Font Family: STHeiti SC
Font: STHeitiSC-Medium
Font: STHeitiSC-Light
Font Family: STHeiti TC
Font: STHeitiTC-Light
Font: STHeitiTC-Medium
Font Family: Times New Roman
Font: TimesNewRomanPSMT
Font: TimesNewRomanPS-BoldMT
Font: TimesNewRomanPS-BoldItalicMT
Font: TimesNewRomanPS-ItalicMT
Font Family: Trebuchet MS
Font: TrebuchetMS-Italic
Font: TrebuchetMS
Font: Trebuchet-BoldItalic
Font: TrebuchetMS-Bold
Font Family: Verdana
Font: Verdana-Bold
Font: Verdana-BoldItalic
Font: Verdana
Font: Verdana-Italic
Font Family: Zapfino
Font: Zapfino
*/
//文本对齐方式
/* Values for NSTextAlignment */
/*
NSTextAlignmentLeft 左对齐
NSTextAlignmentCenter 剧中对齐
NSTextAlignmentRight 右对齐
NSTextAlignmentJustified 两端对齐
NSTextAlignmentNatural 根据显示的文字特性对齐
*/
//段落样式
/*
lineSpacing; 来增加行距
paragraphSpacing;
alignment; 对齐
firstLineHeadIndent; 段落开始的缩排像素
headIndent; 可调整全部文字的缩排距离，可当作左边 padding 使用
tailIndent; 可调整文字尾端的缩排距离。需要注意的是，这里指定的值可以当作文字显示的宽、而也可当作右边 padding 使用，依据输入的正负值而定：
lineBreakMode;
minimumLineHeight;
maximumLineHeight; 而针对不同的字型与字号，我们可以透过指定最大与最小行距（maximumLineHeight 与 minimumLineHeight）来避免过高或过窄的状况发生。
baseWritingDirection;
lineHeightMultiple; 想要调整行距，可以透过搭配使用 lineHeightMultiple 更改行距倍数
paragraphSpacingBefore; 而若是文章内容有分段落的话，也可以透过指定段落结尾距离（paragraphSpacing）以及段落开头距离（paragraphSpacingBefore）:
hyphenationFactor;
@property(readwrite,copy,NS_NONATOMIC_IOSONLY) NSArray *tabStops NS_AVAILABLE_IOS(7_0);
@property(readwrite,NS_NONATOMIC_IOSONLY) CGFloat defaultTabInterval NS_AVAILABLE_IOS(7_0);
*/
/* Predefined character attributes for text. If the key is not in the dictionary, then use the default values as described below. //预定义的文本属性值，如果键不是一个字典，那么使用默认的值作为以下描述
NSFontAttributeName 字体 默认是Helvetica 12号
NSParagraphStyleAttributeName 段落样式
*/