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;