4.1 NSAttributedString - 斯坦福 iOS

NSAttributedString/NSMutableAttributedString

• 返回给定索引处字符的属性

    //range:返回有多少个连续的字符有相同的属性,不需要的话填写 null
    - (NSDictionary *)attributesAtIndex:(NSUInteger)index effectiveRange:(NSRangePointer)range;
  

• 把NSAttributedString(属性字符串)转换为 NSString
  - (NSString *)string

• 在指定范围内添加属性
  - (void)addAttribute:(NSString *)name value:(id)value range:(NSRange)aRange

• 在指定范围内设置属性
  - (void)setAttributes:(NSDictionary<NSString *,id> *)attributes range:(NSRange)aRange

• 在指定范围内删除属性
  - (void)removeAttribute:(NSString *)name range:(NSRange)aRange

• 属性字典

    NSFontAttributeName: - 字体(UIFont *)
    NSParagraphStyleAttributeName: - 段落(NSParagraphStyle * / NSMutableParagraphStyle *)
    NSForegroundColorAttributeName - 前景颜色(UIColor *)
    NSBackgroundColorAttributeName:- 背景颜色(UIColor *)
    NSLigatureAttributeName;
    NSKernAttributeName;
    NSStrikethroughStyleAttributeName;
    NSUnderlineStyleAttributeName: - 下划线样式属性名(NSUnderlineStyle,结构体)
    NSStrokeColorAttributeName: - 边框颜色(UIColor *)
    NSStrokeWidthAttributeName: - 边宽(NSNumber *)
    NSShadowAttributeName;
    NSTextEffectAttributeName;
    NSAttachmentAttributeName;
    NSLinkAttributeName;
    NSBaselineOffsetAttributeName;
    NSUnderlineColorAttributeName: - 下划线颜色
    NSStrikethroughColorAttributeName;
    NSObliquenessAttributeName;
    NSExpansionAttributeName;
    NSWritingDirectionAttributeName;
    NSVerticalGlyphFormAttributeName;
  

• 在哪儿使用 NSAttributedString ?

  • UIButton
    - (void)setAttributedTitle:(NSAttributedString *)title forState: ;

  • UILabel
    - @property (nonatomic,strong) NSAttributedString *attributedText;

  • UITextView
    - @property (nonatomic,readonly) NSTextStorage *textStorage;