IOS控件学习：UILabel常用属性与用法（转）

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iOS
原文链接：http://duchengjiu.iteye.com/blog/2041391

保存下来随时查看，感谢分享。

参考网站：
http://shijue.me/show_text/521c396a8ddf876566000007
http://www.tuicool.com/articles/zquENb
http://blog.csdn.net/a451493485/article/details/9454695
http://wiki.eoe.cn/page/iOS_pptl_artile_28190.html
http://www.xue5.com/Mobile/iOS/673562.html
#import "ViewController.h"  
#import <CoreText/CoreText.h>  
  
@interface ViewController ()  
  
@end  
  
@implementation ViewController  
  
- (void)viewDidLoad  
{  
    [super viewDidLoad];  
    //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 
     */  
    /* 
    UIKIT_EXTERN NSString *const  NS_AVAILABLE_IOS(6_0);      // NSParagraphStyle, default defaultParagraphStyle 
    UIKIT_EXTERN NSString *const NSForegroundColorAttributeName NS_AVAILABLE_IOS(6_0);     // UIColor, default blackColor 
    UIKIT_EXTERN NSString *const NSBackgroundColorAttributeName NS_AVAILABLE_IOS(6_0);     // UIColor, default nil: no background 
    UIKIT_EXTERN NSString *const NSLigatureAttributeName NS_AVAILABLE_IOS(6_0);            // NSNumber containing integer, default 1: default ligatures, 0: no ligatures 
    UIKIT_EXTERN NSString *const NSKernAttributeName NS_AVAILABLE_IOS(6_0);                // NSNumber containing floating point value, in points; amount to modify default kerning. 0 means kerning is disabled. (note: values other than nil and 0 are unsupported on iOS) 
    UIKIT_EXTERN NSString *const NSStrikethroughStyleAttributeName NS_AVAILABLE_IOS(6_0);  // NSNumber containing integer, default 0: no strikethrough 
    UIKIT_EXTERN NSString *const NSUnderlineStyleAttributeName NS_AVAILABLE_IOS(6_0);      // NSNumber containing integer, default 0: no underline 
    UIKIT_EXTERN NSString *const NSStrokeColorAttributeName NS_AVAILABLE_IOS(6_0);         // UIColor, default nil: same as foreground color 
    UIKIT_EXTERN NSString *const NSStrokeWidthAttributeName NS_AVAILABLE_IOS(6_0);         // NSNumber containing floating point value, in percent of font point size, default 0: no stroke; positive for stroke alone, negative for stroke and fill (a typical value for outlined text would be 3.0) 
    UIKIT_EXTERN NSString *const NSShadowAttributeName NS_AVAILABLE_IOS(6_0);              // NSShadow, default nil: no shadow 
    UIKIT_EXTERN NSString *const NSTextEffectAttributeName NS_AVAILABLE_IOS(7_0);          // NSString, default nil: no text effect 
 
    UIKIT_EXTERN NSString *const NSAttachmentAttributeName NS_AVAILABLE_IOS(7_0);          // NSTextAttachment, default nil 
    UIKIT_EXTERN NSString *const NSLinkAttributeName NS_AVAILABLE_IOS(7_0);                // NSURL (preferred) or NSString 
    UIKIT_EXTERN NSString *const NSBaselineOffsetAttributeName NS_AVAILABLE_IOS(7_0);      // NSNumber containing floating point value, in points; offset from baseline, default 0 
    UIKIT_EXTERN NSString *const NSUnderlineColorAttributeName NS_AVAILABLE_IOS(7_0);      // UIColor, default nil: same as foreground color 
    UIKIT_EXTERN NSString *const NSStrikethroughColorAttributeName NS_AVAILABLE_IOS(7_0);  // UIColor, default nil: same as foreground color 
    UIKIT_EXTERN NSString *const NSObliquenessAttributeName NS_AVAILABLE_IOS(7_0);         // NSNumber containing floating point value; skew to be applied to glyphs, default 0: no skew 
    UIKIT_EXTERN NSString *const NSExpansionAttributeName NS_AVAILABLE_IOS(7_0);           // NSNumber containing floating point value; log of expansion factor to be applied to glyphs, default 0: no expansion 
 
    UIKIT_EXTERN NSString *const NSWritingDirectionAttributeName NS_AVAILABLE_IOS(7_0);    // NSArray of NSNumbers representing the nested levels of writing direction overrides as defined by Unicode LRE, RLE, LRO, and RLO characters.  The control characters can be obtained by masking NSWritingDirection and NSTextWritingDirection values.  LRE: NSWritingDirectionLeftToRight|NSTextWritingDirectionEmbedding, RLE: NSWritingDirectionRightToLeft|NSTextWritingDirectionEmbedding, LRO: NSWritingDirectionLeftToRight|NSTextWritingDirectionOverride, RLO: NSWritingDirectionRightToLeft|NSTextWritingDirectionOverride, 
 
    UIKIT_EXTERN NSString *const NSVerticalGlyphFormAttributeName NS_AVAILABLE_IOS(6_0);   // An NSNumber containing an integer value.  0 means horizontal text.  1 indicates vertical text.  If not specified, it could follow higher-level vertical orientation settings.  Currently on iOS, it's always horizontal.  The behavior for any other value is undefined. 
     */  
      
    // NSParagraphStyle  段落样式  
//    typedef NS_ENUM(NSInteger, NSLineBreakMode) {     /* What to do with long lines */ //对于长内容或多行内容的处理方式  
//        NSLineBreakByWordWrapping = 0,        /* Wrap at word boundaries, default */   //按包含单词为界限截断  
//        NSLineBreakByCharWrapping,        /* Wrap at character boundaries */           //按字符为界限截断  
//        NSLineBreakByClipping,        /* Simply clip */                                //简单的修剪  
//        NSLineBreakByTruncatingHead,  /* Truncate at head of line: "...wxyz" */        //截断头部  
//        NSLineBreakByTruncatingTail,  /* Truncate at tail of line: "abcd..." */        //截断尾巴  
//        NSLineBreakByTruncatingMiddle /* Truncate middle of line:  "ab...yz" */        //截断中间  
//    } NS_ENUM_AVAILABLE_IOS(6_0);  
}  
//获取斜体  
UIFont * GetVariationOfFontWithTrait(UIFont *baseFont,  
                                     CTFontSymbolicTraits trait) {  
    CGFloat fontSize = [baseFont pointSize];  
    CFStringRef  
    baseFontName = (__bridge CFStringRef)[baseFont fontName];  
    CTFontRef baseCTFont = CTFontCreateWithName(baseFontName,  
                                                fontSize, NULL);  
    CTFontRef ctFont =  
    CTFontCreateCopyWithSymbolicTraits(baseCTFont, 0, NULL,  
                                       trait, trait);  
    NSString *variantFontName =  
    CFBridgingRelease(CTFontCopyName(ctFont,  
                                     kCTFontPostScriptNameKey));  
  
    UIFont *variantFont = [UIFont fontWithName:variantFontName  
                                          size:fontSize];  
    CFRelease(ctFont);  
    CFRelease(baseCTFont);  
    return variantFont;  
};  
  
  
- (void)didReceiveMemoryWarning  
{  
    [super didReceiveMemoryWarning];  
    // Dispose of any resources that can be recreated.  
}  
  
@end
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