<原>DTCoreText学习(一)－DTAttributedTextCell原理

其实DTCoreText自带的cell就很好用了，解析html并且显示html都很方便，只要设置DTAttributedTextCell的

- (void)setHTMLString:(NSString *)html方法即可，其原理如下面所示

 1 - (id)initWithReuseIdentifier:(NSString *)reuseIdentifier accessoryType:(UITableViewCellAccessoryType)accessoryType

 2 {

 3     self = [super initWithStyle:UITableViewCellStyleDefault reuseIdentifier:reuseIdentifier];

 4     if (self) 

 5     {

 6         // don't know size jetzt because there's no string in it

 7         _attributedTextContextView = [[DTAttributedTextContentView alloc] initWithFrame:CGRectZero];

 8         _attributedTextContextView.edgeInsets = UIEdgeInsetsMake(5, 5, 5, 5);

 9         [self.contentView addSubview:_attributedTextContextView];

10     }

11     return self;

12 }

这是DTAttributedTextCell中定义的初始化方法  在cell的contentView上覆盖了一层DTAttributedTextContentView 而我们的html正是通过它显示出来的，

 1 - (void)setHTMLString:(NSString *)html

 2 {

 3     // we don't preserve the html but compare it's hash

 4     NSUInteger newHash = [html hash];

 5     

 6     if (newHash == _htmlHash)

 7     {

 8         return;

 9     }

10     

11     _htmlHash = newHash;

12     

13     NSData *data = [html dataUsingEncoding:NSUTF8StringEncoding];

14     NSAttributedString *string = [[NSAttributedString alloc] initWithHTML:data documentAttributes:NULL];

15     self.attributedString = string;

16 }

17 

18 - (void)setAttributedString:(NSAttributedString *)attributedString

19 {

20     if (_attributedString != attributedString)

21     {

22         _attributedString = attributedString;

23         

24         // passthrough

25         _attributedTextContextView.attributedString = _attributedString;

26     }

27 }

_attributedString的类型是NSAttributedString  我们把要显示的html传递给 setHTMLString:(NSString *)html   最后调用self.attributedString = string; 后进入setAttributedString:(NSAttributedString *)attributedString

最终设置  _attributedTextContextView.attributedString = _attributedString；达到显示的目的

DTAttributedTextCell常用的就这几个方法  一般了解这几个方法的使用  就能简单的实现利用 DTAttributedTextCell解析并显示html