在iOS7中让表视图变成iOS6的圆角矩形与纯汉字文本的cell高度自适应

- (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath{    if ([cell respondsToSelector:@selector(tintColor)]) {        if (tableView == self.aTableView) {                        CGFloat cornerRadius = 5.f;            cell.backgroundColor = UIColor.clearColor;            CAShapeLayer *layer = [[CAShapeLayer alloc] init];            CGMutablePathRef pathRef = CGPathCreateMutable();                        CGRect frame = cell.bounds;            frame.origin.x = frame.origin.x+5;            frame.size.width = frame.size.width-20;            CGRect bounds = frame;                        BOOL addLine = NO;            if (indexPath.row == 0 && indexPath.row == [tableView numberOfRowsInSection:indexPath.section]-1) {                CGPathAddRoundedRect(pathRef, nil, bounds, cornerRadius, cornerRadius);            } else if (indexPath.row == 0) {                CGPathMoveToPoint(pathRef, nil, CGRectGetMinX(bounds), CGRectGetMaxY(bounds));                CGPathAddArcToPoint(pathRef, nil, CGRectGetMinX(bounds), CGRectGetMinY(bounds), CGRectGetMidX(bounds), CGRectGetMinY(bounds), cornerRadius);                CGPathAddArcToPoint(pathRef, nil, CGRectGetMaxX(bounds), CGRectGetMinY(bounds), CGRectGetMaxX(bounds), CGRectGetMidY(bounds), cornerRadius);                CGPathAddLineToPoint(pathRef, nil, CGRectGetMaxX(bounds), CGRectGetMaxY(bounds));                addLine = YES;            } else if (indexPath.row == [tableView numberOfRowsInSection:indexPath.section]-1) {                CGPathMoveToPoint(pathRef, nil, CGRectGetMinX(bounds), CGRectGetMinY(bounds));                CGPathAddArcToPoint(pathRef, nil, CGRectGetMinX(bounds), CGRectGetMaxY(bounds), CGRectGetMidX(bounds), CGRectGetMaxY(bounds), cornerRadius);                CGPathAddArcToPoint(pathRef, nil, CGRectGetMaxX(bounds), CGRectGetMaxY(bounds), CGRectGetMaxX(bounds), CGRectGetMidY(bounds), cornerRadius);                CGPathAddLineToPoint(pathRef, nil, CGRectGetMaxX(bounds), CGRectGetMinY(bounds));            } else {                CGPathAddRect(pathRef, nil, bounds);                addLine = YES;            }            layer.path = pathRef;            CFRelease(pathRef);            layer.fillColor = [UIColor colorWithWhite:1.f alpha:0.8f].CGColor;                        if (addLine == YES) {                CALayer *lineLayer = [[CALayer alloc] init];                CGFloat lineHeight = (1.f / [UIScreen mainScreen].scale);                lineLayer.frame = CGRectMake(CGRectGetMinX(bounds)+10, bounds.size.height-lineHeight, bounds.size.width-10, lineHeight);                lineLayer.backgroundColor = tableView.separatorColor.CGColor;                [layer addSublayer:lineLayer];            }            UIView *testView = [[UIView alloc] initWithFrame:bounds];            [testView.layer insertSublayer:layer atIndex:0];            testView.backgroundColor = UIColor.clearColor;            cell.backgroundView = testView;        }    }}

/** *  计算方式:    step1：数一下一行能显示几个汉字    step2:算一下一共几行    step3:如果汉字不满一行按一行一算    step4:用行数乘以行高 */    int lineCount = 20;    CGFloat lbContentHeight = lbQ.text.length / lineCount;    if (lbQ.text.length % lineCount) {        lbContentHeight++;    }    lbContentHeight *= 20;