【iOS】文字处理之Character Attributes

Character Attributes

作用：可用来做iOS的一些特效文字 扩展到图文混排和文字自适应

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1. NSAttachmentAttributeName

The value of this attribute is an NSTextAttachment object. The default value of this property is nil, indicating no attachment.

图文混排效果

- (void)viewDidLoad {
  [super viewDidLoad];
  self.view.backgroundColor = [UIColor greenColor];    
  //图片
  NSTextAttachment *txa = [[NSTextAttachment alloc] init];
  txa.image = [UIImage imageNamed:@"k2"];
  txa.bounds = CGRectMake(0, -20, 50, 50);//默认以文字底部线为中心 而不是文字的中心
  NSAttributedString *imageA = [NSAttributedString attributedStringWithAttachment:txa];
  //文字
  NSString *testStr = @"感觉自己萌萌哒- -";
  NSAttributedString *att = [[NSAttributedString alloc] initWithString:testStr attributes:nil];
  
  NSMutableAttributedString *mu = [[NSMutableAttributedString alloc] init];
  [mu appendAttributedString:att];
  [mu insertAttributedString:imageA atIndex:7];
  UILabel *textLable = [[UILabel alloc] init];
  textLable.attributedText = mu;
  textLable.backgroundColor = [UIColor whiteColor];
  [self.view addSubview:textLable];
  textLable.center = self.view.center;
  textLable.bounds = CGRectMake(0, 0, 500, 500);
}

然而我却不知道这个Key值到底是干嘛用的 因为图文混排的话不能像字体等通过字典传给字符串转换成NSAttributedString

2. NSBackgroundColorAttributeName

The value of this attribute is a UIColor object. Use this attribute to specify the color of the background area behind the text. If you do not specify this attribute, no background color is drawn.

3. NSBaselineOffsetAttributeName

The value of this attribute is an NSNumber object containing a floating point value indicating the character’s offset from the baseline, in points. The default value is 0.

4. NSCursorAttributeName

The value of this attribute is an NSCursor object. The default value is the cursor returned by the IBeamCursor method

5. NSExpansionAttributeName

The value of this attribute is an NSNumber object containing a floating point value indicating the log of the expansion factor to be applied to glyphs. The default value is 0, indicating no expansion.

6. NSFontAttributeName

The value of this attribute is a UIFont object. Use this attribute to change the font for a range of text. If you do not specify this attribute, the string uses a 12-point Helvetica(Neue) font by default.

7. NSForegroundColorAttributeName

The value of this attribute is a UIColor object. Use this attribute to specify the color of the text during rendering. If you do not specify this attribute, the text is rendered in black.

8. NSKernAttributeName

The value of this attribute is an NSNumber object containing a floating-point value. This value specifies the number of points by which to adjust kern-pair characters. Kerning prevents unwanted space from occurring between specific characters and depends on the font. The value 0 means kerning is disabled. The default value for this attribute is 0.

9. NSLigatureAttributeName

The value of this attribute is an NSNumber object containing an integer. Ligatures cause specific character combinations to be rendered using a single custom glyph that corresponds to those characters. The value 0 indicates no ligatures. The value 1 indicates the use of the default ligatures. The value 2 indicates the use of all ligatures. The default value for this attribute is 1. (Value 2 is unsupported on iOS.)

10. NSLinkAttributeName

The value of this attribute is an NSURL object (preferred) or an NSString object. The default value of this property is nil, indicating no link.

11. NSMarkedClauseSegmentAttributeName

The value of this attribute is an NSNumber object containing an integer, as an index in marked text indicating clause segments

12. NSObliquenessAttributeName

The value of this attribute is an NSNumber object containing a floating point value indicating skew to be applied to glyphs. The default value is 0, indicating no skew.

13. NSParagraphStyleAttributeName

The value of this attribute is an NSParagraphStyle object. Use this attribute to apply multiple attributes to a range of text. If you do not specify this attribute, the string uses the default paragraph attributes, as returned by the defaultParagraphStyle method of NSParagraphStyle.

14. NSShadowAttributeName

The value of this attribute is an NSShadow object. The default value of this property is nil.

15. NSStrikethroughColorAttributeName

The value of this attribute is a UIColor object. The default value is nil, indicating same as foreground color.

16. NSStrikethroughStyleAttributeName

The value of this attribute is an NSNumber object containing an integer. This value indicates whether the text has a line through it and corresponds to one of the constants described in NSUnderlineStyle. The default value for this attribute is NSUnderlineStyleNone.

17. NSStrokeColorAttributeName

The value of this parameter is a UIColor object. If it is not defined (which is the case by default), it is assumed to be the same as the value of NSForegroundColorAttributeName; otherwise, it describes the outline color. For more details, see Drawing attributed strings that are both filled and stroked.

18. NSStrokeWidthAttributeName

The value of this attribute is an NSNumber object containing a floating-point value. This value represents the amount to change the stroke width and is specified as a percentage of the font point size. Specify 0 (the default) for no additional changes. Specify positive values to change the stroke width alone. Specify negative values to stroke and fill the text. For example, a typical value for outlined text would be 3.0.

19. NSTextEffectAttributeName

The value of this attribute is an NSString object. Use this attribute to specify a text effect, such as NSTextEffectLetterpressStyle. The default value of this property is nil, indicating no text effect.

20. NSUnderlineColorAttributeName

The value of this attribute is a UIColor object. The default value is nil, indicating same as foreground color.

21. NSUnderlineStyleAttributeName

The value of this attribute is an NSNumber object containing an integer. This value indicates whether the text is underlined and corresponds to one of the constants described in NSUnderlineStyle.

The default value for this attribute is NSUnderlineStyleNone.

22. NSVerticalGlyphFormAttributeName

The value of this attribute is an NSNumber object containing an integer. The value 0 indicates horizontal text. The value 1 indicates vertical text. In iOS, horizontal text is always used and specifying a different value is undefined.

23. NSWritingDirectionAttributeName

The value of this attribute is an NSArray object containing NSNumber objects representing the nested levels of writing direction overrides, in order from outermost to innermost.

This attribute provides a means to override the default bidirectional text algorithm, equivalent to using the Unicode bidi control characters LRE, RLE, LRO, or RLO paired with PDF, but as a higher-level attribute. (See Unicode Standard Annex #9 for information about the Unicode bidi formatting codes.) The NSWritingDirectionAttributeName constant is a character-level attribute that provides a higher-level alternative to the inclusion of explicit bidirectional control characters in text. It is the NSAttributedString equivalent of the HTML markup using bdo element with the dir attribute.

The values of the NSNumber objects should be 0, 1, 2, or 3, for LRE, RLE, LRO, or RLO respectively, and combinations of NSWritingDirectionLeftToRight and NSWritingDirectionRightToLeft with NSTextWritingDirectionEmbedding or NSTextWritingDirectionOverride, as shown in Table 1.

Table 1
Values of NSWritingDirectionAttributeName and equivalent markup

Array NSNumber Values	Unicode Control Characters	Writing Direction Constants
0	LRE	NSWritingDirectionLeftToRight / NSTextWritingDirectionEmbedding
1	RLE	NSWritingDirectionRightToLeft / NSTextWritingDirectionEmbedding
2	LRO	NSWritingDirectionLeftToRight / NSTextWritingDirectionOverride
3	RLO	NSWritingDirectionRightToLeft / NSTextWritingDirectionOverride

mac os
NSToolTipAttributeName

The value of this attribute is an NSString object containing the tooltip text. The default value is nil, indicating no tooltip is available.

NSTextAlternativesAttributeName

The value of this attribute is an NSTextAlternatives object representing alternatives for a string that may be presented to the user.

NSSpellingStateAttributeName

This key is available in macOS 10.2 and later, but its interpretation changed in OS X v10.5. Previously, any non-zero value caused the spelling indicator to be displayed. For macOS 10.5 and later, the (integer) value is treated as being composed of the spelling and grammar flags. See NSSpellingStateAttributeName Flags for possible values.
The value of this attribute is an integer. Defaults to 0, indicating no grammar or spelling error.

NSSuperscriptAttributeName

The value of this attribute is an NSNumber object containing an integer. The default value is 0.

参考： http://www.jianshu.com/p/3a0016b4c3de