如何實現iOS6的TableView分組樣式

####iOS7之後Apple大大極力推行扁平化。各種App的風格從立體的變成平面，形態上從豐富變得簡約。

• iOS6下的TableView是這樣子的

• 而iOS7下的TableView是這樣子的

• 可是問題來了。如何在新版的iOS系統上實現舊版的樣式呢？

找一找系統有沒有保留舊的樣式介面？騷年，這條路不行。 目前實現的方法就是自己手寫樣式，在cell上動手腳。具體怎麼實現的，請往下看。

//在tableView即將顯示cell的時候改動cell的樣式，通常cell展示動畫也是在這裡做的。
- (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath
{
    
    if ([cell respondsToSelector:@selector(tintColor)]) {
        
        if (tableView == self.tableView) {
            
            CGFloat cornerRadius = 5.f;
            
            cell.backgroundColor = UIColor.clearColor;
            
            CAShapeLayer *layer = [[CAShapeLayer alloc] init];
            
            CGMutablePathRef pathRef = CGPathCreateMutable();
            
            CGRect bounds = CGRectInset(cell.bounds, 10, 0);
            
            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;
            
        }
    }
}
複製程式碼

• 程式碼就這多，具體實現多看看就懂了。

###全文完。