HMSegmentedControl源代码解析（12）

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/**
返回一个富文本string
@param index index
@return 富文本string
*/
- (NSAttributedString *)attributedTitleAtIndexNSUInteger)index {
    id title = self.sectionTitles[index];
    BOOL selected = (index == self.selectedSegmentIndex) ? YES : NO;
   
    if ([title isKindOfClass:[NSAttributedString class]]) {
        return (NSAttributedString *)title;
    } else if (!self.titleFormatter) {
        NSDictionary *titleAttrs = selected ? [self resultingSelectedTitleTextAttributes] : [self resultingTitleTextAttributes];
        
        // the color should be cast to CGColor in order to avoid invalid context on iOS7
        UIColor *titleColor = titleAttrs[NSForegroundColorAttributeName];
        
        if (titleColor) {
            NSMutableDictionary *dict = [NSMutableDictionary dictionaryWithDictionary:titleAttrs];
            
            dict[NSForegroundColorAttributeName] = (id)titleColor.CGColor;
            
            titleAttrs = [NSDictionary dictionaryWithDictionary:dict];
        }
        
        return [[NSAttributedString alloc] initWithStringNSString *)title attributes:titleAttrs];
    } else {
        return self.titleFormatter(self, title, index, selected);
    }
}