NSString *str = @"This is a test of characterAttribute. 中文字符";

    NSMutableAttributedString *mabstring = [[NSMutableAttributedString alloc]initWithString:str];  

    [mabstring beginEditing];  

    //对同一段字体进行多属性设置

    //红色

    NSMutableDictionary *attributes = [NSMutableDictionary dictionaryWithObject:(id)[UIColor redColor].CGColor forKey:(id)kCTForegroundColorAttributeName];

    //斜体

    CTFontRef font = CTFontCreateWithName((CFStringRef)[UIFont italicSystemFontOfSize:].fontName, , NULL);

    [attributes setObject:(id)font forKey:(id)kCTFontAttributeName];

    //下划线

    [attributes setObject:(id)[NSNumber numberWithInt:kCTUnderlineStyleDouble] forKey:(id)kCTUnderlineStyleAttributeName];  

    [mabstring addAttributes:attributes range:NSMakeRange(, )];       

    NSRange kk = NSMakeRange(, );  

    NSDictionary * dc = [mabstring attributesAtIndex: effectiveRange:&kk];  

    [mabstring endEditing];


 

    CTFramesetterRef framesetter = CTFramesetterCreateWithAttributedString((CFAttributedStringRef)mabstring);  

    CGMutablePathRef Path = CGPathCreateMutable();  

    CGPathAddRect(Path, NULL ,CGRectMake( ,  ,self.bounds.size.width- , self.bounds.size.height-));  

    CTFrameRef frame = CTFramesetterCreateFrame(framesetter, CFRangeMake(, ), Path, NULL);      

    //获取当前(View)上下文以便于之后的绘画，这个是一个离屏。

    CGContextRef context = UIGraphicsGetCurrentContext();  

    CGContextSetTextMatrix(context , CGAffineTransformIdentity);  

    //压栈，压入图形状态栈中.每个图形上下文维护一个图形状态栈，并不是所有的当前绘画环境的图形状态的元素都被保存。图形状态中不考虑当前路径，所以不保存

    //保存现在的上下文图形状态。不管后续对context上绘制什么都不会影响真正得屏幕。

    CGContextSaveGState(context);  

    //x，y轴方向移动

    CGContextTranslateCTM(context ,  ,self.bounds.size.height);  

    //缩放x，y轴方向缩放，－1.0为反向1.0倍,坐标系转换,沿x轴翻转180度

    CGContextScaleCTM(context, 1.0 ,-1.0);  

    CTFrameDraw(frame,context);  

    CGPathRelease(Path);

    CFRelease(framesetter);