应对富文本需求
富文本是一段有属性的字符串，可以包含不同字体，不同字号，不同背景，不同颜色，不同字间距的文字，还可以设置段落，图文混排等等属性。
WebView
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| self.wbView = [[UIWebView alloc] init];
self.wbView.delegate = self;
[self.view addSubview:self.wbView];
[self.wbView mas_makeConstraints:^(MASConstraintMaker *make) {
make.top.left.right.bottom.equalTo(self.view);
}];
self.wbView.scalesPageToFit = YES;
self.wbView.scrollView.directionalLockEnabled = YES;
self.wbView.scrollView.showsHorizontalScrollIndicator = NO;
[self.wbView setOpaque:NO];
[self.wbView loadHTMLString:articleString baseURL:nil];
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在Cocoa层使用NSURLProtocol可以拦截所有HTTP的请求，可以以此来缓存文章中的图片。
YYText
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| NSMutableAttributedString *text = [NSMutableAttributedString new];
UIFont *font = [UIFont systemFontOfSize:16];
NSMutableAttributedString *attachment = nil;
UIImage *image = [UIImage imageNamed:@"dribbble64_imageio"];
attachment = [NSMutableAttributedString yy_attachmentStringWithContent:image contentMode:UIViewContentModeCenter attachmentSize:image.size alignToFont:font alignment:YYTextVerticalAlignmentCenter];
[text appendAttributedString: attachment];
UISwitch *switcher = [UISwitch new];
[switcher sizeToFit];
attachment = [NSMutableAttributedString yy_attachmentStringWithContent:switcher contentMode:UIViewContentModeBottom attachmentSize:switcher.size alignToFont:font alignment:YYTextVerticalAlignmentCenter];
[text appendAttributedString: attachment];
CASharpLayer *layer = [CASharpLayer layer];
layer.path = ...
attachment = [NSMutableAttributedString yy_attachmentStringWithContent:layer contentMode:UIViewContentModeBottom attachmentSize:switcher.size alignToFont:font alignment:YYTextVerticalAlignmentCenter];
[text appendAttributedString: attachment];
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