Question

我们如何在tableview的每个部分周围设置边框？附图是显示我正在寻找的图像。如果你看图像，它在每个tableview部分周围都有一个边框。

enter image description here

Answer 1

对于这个问题，我修改了jvanmetre答案来舍入tableviews角，只需使用以下代码添加tableView:willDisplayCell:forRowAtIndexPath:委托方法（简单的复制/粘贴应该有效），它应该适用于分组表也是如此。我评论了你应该在哪里设置边框的宽度和颜色。

- (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath
    {

    if ([cell respondsToSelector:@selector(tintColor)]) {
        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);
        //set the border color
        layer.strokeColor = [UIColor lightGrayColor].CGColor;
        //set the border width
        layer.lineWidth = 1;
        layer.fillColor = [UIColor colorWithWhite:1.f alpha:1.0f].CGColor;


        if (addLine == YES) {
            CALayer *lineLayer = [[CALayer alloc] init];
            CGFloat lineHeight = (1.f / [UIScreen mainScreen].scale);
            lineLayer.frame = CGRectMake(CGRectGetMinX(bounds), bounds.size.height-lineHeight, bounds.size.width, 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;
    }
}

另外，请记住在Interface Builder中将表的separator属性设置为none（默认为单行），如果以编程方式创建表，则应设置如下属性

yourTableView.separatorStyle = UITableViewCellSeparatorStyleNone

Answer 2

这是Asad的答案更新为swift 3

func tableView(_ tableView: UITableView, willDisplay cell: UITableViewCell, forRowAt indexPath: IndexPath) {
    if (cell.responds(to: #selector(getter: UIView.tintColor))) {
        let cornerRadius: CGFloat = 5
        cell.backgroundColor = UIColor.clear
        let layer: CAShapeLayer  = CAShapeLayer()
        let pathRef: CGMutablePath  = CGMutablePath()
        let bounds: CGRect  = cell.bounds.insetBy(dx: 10, dy: 0)
        var addLine: Bool  = false
        if (indexPath.row == 0 && indexPath.row == tableView.numberOfRows(inSection: indexPath.section)-1) {
            pathRef.__addRoundedRect(transform: nil, rect: bounds, cornerWidth: cornerRadius, cornerHeight: cornerRadius)
        } else if (indexPath.row == 0) {
            pathRef.move(to: CGPoint(x:bounds.minX,y:bounds.maxY))
            pathRef.addArc(tangent1End: CGPoint(x:bounds.minX,y:bounds.minY), tangent2End: CGPoint(x:bounds.midX,y:bounds.minY), radius: cornerRadius)

            pathRef.addArc(tangent1End: CGPoint(x:bounds.maxX,y:bounds.minY), tangent2End: CGPoint(x:bounds.maxX,y:bounds.midY), radius: cornerRadius)
            pathRef.addLine(to: CGPoint(x:bounds.maxX,y:bounds.maxY))
            addLine = true;
        } else if (indexPath.row == tableView.numberOfRows(inSection: indexPath.section)-1) {

            pathRef.move(to: CGPoint(x:bounds.minX,y:bounds.minY))
            pathRef.addArc(tangent1End: CGPoint(x:bounds.minX,y:bounds.maxY), tangent2End: CGPoint(x:bounds.midX,y:bounds.maxY), radius: cornerRadius)

            pathRef.addArc(tangent1End: CGPoint(x:bounds.maxX,y:bounds.maxY), tangent2End: CGPoint(x:bounds.maxX,y:bounds.midY), radius: cornerRadius)
            pathRef.addLine(to: CGPoint(x:bounds.maxX,y:bounds.minY))

        } else {
            pathRef.addRect(bounds)
            addLine = true
        }
        layer.path = pathRef
        //CFRelease(pathRef)
        //set the border color
        layer.strokeColor = UIColor.lightGray.cgColor;
        //set the border width
        layer.lineWidth = 1
        layer.fillColor = UIColor(white: 1, alpha: 1.0).cgColor


        if (addLine == true) {
            let lineLayer: CALayer = CALayer()
            let lineHeight: CGFloat  = (1 / UIScreen.main.scale)
            lineLayer.frame = CGRect(x:bounds.minX, y:bounds.size.height-lineHeight, width:bounds.size.width, height:lineHeight)
            lineLayer.backgroundColor = tableView.separatorColor!.cgColor
            layer.addSublayer(lineLayer)
        }

        let testView: UIView = UIView(frame:bounds)
        testView.layer.insertSublayer(layer, at: 0)
        testView.backgroundColor = UIColor.clear
        cell.backgroundView = testView
    }

}

Answer 3

这是另一种我最终可以帮助某人的方法。它使用预定义的颜色和宽度绘制每个部分的边框，而不更改单元格的其他属性。它没有给你一个圆形的部分（可能它可以相应地修改），但它提供了很好的控制线绘制。该方法还解决了设备轮换问题。

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我使用tableView的typedef enum CellBorderMask{ CellBorderMaskLeft = 1 << 0, CellBorderMaskRigth = 1 << 1, CellBorderMaskTop = 1 << 2, CellBorderMaskBottom = 1 << 3 }CellBorderMask; - (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath { CellBorderMask mask; if (indexPath.row == 0){ mask |= CellBorderMaskTop; } if(indexPath.row == [tableView numberOfRowsInSection:indexPath.section] - 1) { mask |= CellBorderMaskBottom; } mask |= CellBorderMaskRigth | CellBorderMaskLeft; [self addBorder:mask forView:cell.contentView]; } -(void)addBorder:(CellBorderMask)mask forView:(UIView *)view{ float onePixel = (1.f / [UIScreen mainScreen].scale); float lineWidth = 1 * onePixel; CGColorRef cgBorderColor = [UIColor redColor].CGColor; CALayer *topBorder = [CALayer layer]; CALayer *bottomBorder = [CALayer layer]; CALayer *leftBorder = [CALayer layer]; CALayer *rightBorder = [CALayer layer]; //tag layers so it's possible to find and remove them later topBorder.name = @"Border"; bottomBorder.name = @"Border"; leftBorder.name = @"Border"; rightBorder.name = @"Border"; //remove previously set border layers so they doesn't produce unwanted effect on orientation change [self cleanUpOldBorderLayers:view]; topBorder.frame = CGRectMake(0.0f, 0.0f, view.bounds.size.width, lineWidth); topBorder.backgroundColor = cgBorderColor; bottomBorder.frame = CGRectMake(0.0f, view.bounds.size.height - lineWidth, view.bounds.size.width, lineWidth); bottomBorder.backgroundColor = cgBorderColor; leftBorder.frame = CGRectMake(0.0f, 0.0f, lineWidth, view.bounds.size.height); leftBorder.backgroundColor = cgBorderColor; rightBorder.frame = CGRectMake(view.bounds.size.width - lineWidth, 0.0f, lineWidth, view.bounds.size.height); rightBorder.backgroundColor = cgBorderColor; if(mask & CellBorderMaskTop){ [view.layer addSublayer:topBorder]; } if(mask & CellBorderMaskBottom){ [view.layer addSublayer:bottomBorder]; } if(mask & CellBorderMaskLeft){ [view.layer addSublayer:leftBorder]; } if(mask & CellBorderMaskRigth){ [view.layer addSublayer:rightBorder]; } } -(void)cleanUpOldBorderLayers:(UIView *)view{ NSMutableArray *layerArray = [NSMutableArray new]; for (CALayer *layer in view.layer.sublayers) { if([@"Border" isEqualToString:layer.name]){ [layerArray addObject:layer]; } } for (CALayer *layer in layerArray) { [layer removeFromSuperlayer]; } } -(void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation{ //need to trigger tableView:willDisplayCell: method on orientation change. //Suggest a better method for this if there is one [self.tableView reloadData]; }方法重绘单元格，我认为这不是最好的方法。请在评论中提供替代方法的建议，我会更新代码。

要向页眉/页脚添加边框，只需在viewForHeaderInSection / viewForFooterInSection委托方法中创建自定义视图，然后将视图传递给上面的reloadData方法，然后再从代理中返回。

Answer 4

您可以使用UITableViewStyleGrouped tableview部分样式。

Answer 5

这是接受答案的快速版本。

func tableView(tableView: UITableView, willDisplayCell cell: UITableViewCell, forRowAtIndexPath indexPath: NSIndexPath) {
    if (cell.respondsToSelector("tintColor")) {
        var cornerRadius: CGFloat = 5;
        cell.backgroundColor = UIColor.clearColor()
        var layer: CAShapeLayer  = CAShapeLayer()
        var pathRef: CGMutablePathRef  = CGPathCreateMutable()
        var bounds: CGRect  = CGRectInset(cell.bounds, 10, 0)
        var addLine: Bool  = false
        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 = true;
        } 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 = true;
        }
        layer.path = pathRef;
        //CFRelease(pathRef);
        //set the border color
        layer.strokeColor = UIColor.lightGrayColor().CGColor;
        //set the border width
        layer.lineWidth = 1;
        layer.fillColor = UIColor(white: 1, alpha: 1.0).CGColor;


        if (addLine == true) {
            var lineLayer: CALayer = CALayer();
            var lineHeight: CGFloat  = (1 / UIScreen.mainScreen().scale);
            lineLayer.frame = CGRectMake(CGRectGetMinX(bounds), bounds.size.height-lineHeight, bounds.size.width, lineHeight);
            lineLayer.backgroundColor = tableView.separatorColor!.CGColor;
            layer.addSublayer(lineLayer);
        }

        var testView: UIView = UIView(frame:bounds)
        testView.layer.insertSublayer(layer, atIndex: 0)
        testView.backgroundColor = UIColor.clearColor()
        cell.backgroundView = testView
    }

}

Answer 6

针对不同部分中不同行数的有效修复程序

func tableView(_ tableView: UITableView, willDisplay cell: UITableViewCell, forRowAt indexPath: IndexPath) {
            let cornerRadius: CGFloat = 0.0
            cell.backgroundColor = UIColor.clear
            let layer: CAShapeLayer = CAShapeLayer()
            let pathRef: CGMutablePath = CGMutablePath()
            //dx leading an trailing margins
            let bounds: CGRect = cell.bounds.insetBy(dx: 8, dy: 0)
            var addLine: Bool = false

            if indexPath.row == 0 && indexPath.row == tableView.numberOfRows(inSection: indexPath.section) - 1 {
                pathRef.__addRoundedRect(transform: nil, rect: bounds, cornerWidth: cornerRadius, cornerHeight: cornerRadius)
            } else if indexPath.row == 0 {
                pathRef.move(to: CGPoint(x: bounds.minX, y: bounds.maxY))
                pathRef.addArc(tangent1End: CGPoint(x: bounds.minX, y: bounds.minY),
                               tangent2End: CGPoint(x: bounds.midX, y: bounds.minY),
                               radius: cornerRadius)

                pathRef.addArc(tangent1End: CGPoint(x: bounds.maxX, y: bounds.minY),
                               tangent2End: CGPoint(x: bounds.maxX, y: bounds.midY),
                               radius: cornerRadius)
                pathRef.addLine(to: CGPoint(x: bounds.maxX, y: bounds.maxY))
                addLine = true
            } else if indexPath.row == tableView.numberOfRows(inSection: indexPath.section) - 1 {
                pathRef.move(to: CGPoint(x: bounds.minX, y: bounds.minY))
                pathRef.addArc(tangent1End: CGPoint(x: bounds.minX, y: bounds.maxY),
                               tangent2End: CGPoint(x: bounds.midX, y: bounds.maxY),
                               radius: cornerRadius)

                pathRef.addArc(tangent1End: CGPoint(x: bounds.maxX, y: bounds.maxY),
                               tangent2End: CGPoint(x: bounds.maxX, y: bounds.midY),
                               radius: cornerRadius)
                pathRef.addLine(to: CGPoint(x: bounds.maxX, y: bounds.minY))
            } else {
                pathRef.move(to: CGPoint(x: bounds.minX, y: bounds.minY))
                pathRef.addArc(tangent1End: CGPoint(x: bounds.minX, y: bounds.maxY),
                               tangent2End: CGPoint(x: bounds.midX, y: bounds.maxY),
                               radius: cornerRadius)

                pathRef.move(to: CGPoint(x: bounds.maxX, y: bounds.maxY))
                pathRef.addArc(tangent1End: CGPoint(x: bounds.maxX, y: bounds.maxY),
                               tangent2End: CGPoint(x: bounds.maxX, y: bounds.midY),
                               radius: cornerRadius)
                pathRef.addLine(to: CGPoint(x: bounds.maxX, y: bounds.minY))
                addLine = true
            }

            layer.path = pathRef
            layer.strokeColor = UIColor.lightGray.cgColor
            layer.lineWidth = 1.0
            layer.fillColor = UIColor.clear.cgColor

            if addLine == true {
                let lineLayer: CALayer = CALayer()
                let lineHeight: CGFloat = (1 / UIScreen.main.scale)
                lineLayer.frame = CGRect(x: bounds.minX, y: bounds.size.height - lineHeight, width: bounds.size.width, height: lineHeight)
                lineLayer.backgroundColor = UIColor.clear.cgColor
                layer.addSublayer(lineLayer)
            }

            let backgroundView: UIView = UIView(frame: bounds)
            backgroundView.layer.insertSublayer(layer, at: 0)
            backgroundView.backgroundColor = .clear
            cell.backgroundView = backgroundView

        }

Answer 7

这是答案的Swift3版本：

func tableView(_ tableView: UITableView, willDisplay cell: UITableViewCell, forRowAt indexPath: IndexPath) {
    let cornerRadius: CGFloat = 0.0
    cell.backgroundColor = UIColor.clear
    let layer: CAShapeLayer = CAShapeLayer()
    let pathRef: CGMutablePath = CGMutablePath()
    let bounds: CGRect = cell.bounds.insetBy(dx: 10, dy: 0)
    var addLine: Bool = false

    if indexPath.row == 0 && indexPath.row == tableView.numberOfRows(inSection: indexPath.section) - 1 {
        pathRef.__addRoundedRect(transform: nil, rect: bounds, cornerWidth: cornerRadius, cornerHeight: cornerRadius)
    } else if indexPath.row == 0 {
        pathRef.move(to: CGPoint(x: bounds.minX, y: bounds.maxY))
        pathRef.addArc(tangent1End: CGPoint(x: bounds.minX, y: bounds.minY), tangent2End: CGPoint(x: bounds.midX, y: bounds.minY), radius: cornerRadius)
        pathRef.addArc(tangent1End: CGPoint(x: bounds.maxX, y: bounds.minY), tangent2End: CGPoint(x: bounds.maxX, y: bounds.midY), radius: cornerRadius)
        pathRef.addLine(to: CGPoint(x: bounds.maxX, y: bounds.maxY))
        addLine = true
    } else if indexPath.row == tableView.numberOfRows(inSection: indexPath.section) - 1 {
        pathRef.move(to: CGPoint(x: bounds.minX, y: bounds.minY))
        pathRef.addArc(tangent1End: CGPoint(x: bounds.minX, y: bounds.maxY), tangent2End: CGPoint(x: bounds.midX, y: bounds.maxY), radius: cornerRadius)
        pathRef.addArc(tangent1End: CGPoint(x: bounds.maxX, y: bounds.maxY), tangent2End: CGPoint(x: bounds.maxX, y: bounds.midY), radius: cornerRadius)
        pathRef.addLine(to: CGPoint(x: bounds.maxX, y: bounds.minY))
    } else {
        pathRef.addRect(bounds)
        addLine = true
    }

    layer.path = pathRef
    layer.strokeColor = UIColor.black.cgColor
    layer.lineWidth = 0.5
    layer.fillColor = UIColor(white: 1, alpha: 1.0).cgColor

    if addLine == true {
        let lineLayer: CALayer = CALayer()
        let lineHeight: CGFloat = (1 / UIScreen.main.scale)
        lineLayer.frame = CGRect(x: bounds.minX, y: bounds.size.height - lineHeight, width: bounds.size.width, height: lineHeight)
        lineLayer.backgroundColor = tableView.separatorColor!.cgColor
        layer.addSublayer(lineLayer)
    }

    let backgroundView: UIView = UIView(frame: bounds)
    backgroundView.layer.insertSublayer(layer, at: 0)
    backgroundView.backgroundColor = UIColor.clear
    cell.backgroundView = backgroundView
}

Answer 8

此答案修复了给出半径在部分中超过 2 个单元格的问题。

半径：cornerRadius -> 0.0

func tableView(_ tableView: UITableView, willDisplay cell: UITableViewCell, forRowAt indexPath: IndexPath) {
        let cornerRadius: CGFloat = 4.0
        cell.backgroundColor = UIColor.clear
        let layer: CAShapeLayer = CAShapeLayer()
        let pathRef: CGMutablePath = CGMutablePath()
        //dx leading an trailing margins
        let bounds: CGRect = cell.bounds.insetBy(dx: 15, dy: 0)
        var addLine: Bool = false
        
        if indexPath.row == 0 && indexPath.row == tableView.numberOfRows(inSection: indexPath.section) - 1 {
            pathRef.__addRoundedRect(transform: nil, rect: bounds, cornerWidth: cornerRadius, cornerHeight: cornerRadius)
        } else if indexPath.row == 0 {
            pathRef.move(to: CGPoint(x: bounds.minX, y: bounds.maxY))
            pathRef.addArc(tangent1End: CGPoint(x: bounds.minX, y: bounds.minY),
                           tangent2End: CGPoint(x: bounds.midX, y: bounds.minY),
                           radius: cornerRadius)
            
            pathRef.addArc(tangent1End: CGPoint(x: bounds.maxX, y: bounds.minY),
                           tangent2End: CGPoint(x: bounds.maxX, y: bounds.midY),
                           radius: cornerRadius)
            pathRef.addLine(to: CGPoint(x: bounds.maxX, y: bounds.maxY))
            addLine = true
        } else if indexPath.row == tableView.numberOfRows(inSection: indexPath.section) - 1 {
            pathRef.move(to: CGPoint(x: bounds.minX, y: bounds.minY))
            pathRef.addArc(tangent1End: CGPoint(x: bounds.minX, y: bounds.maxY),
                           tangent2End: CGPoint(x: bounds.midX, y: bounds.maxY),
                           radius: cornerRadius)
            
            pathRef.addArc(tangent1End: CGPoint(x: bounds.maxX, y: bounds.maxY),
                           tangent2End: CGPoint(x: bounds.maxX, y: bounds.midY),
                           radius: cornerRadius)
            pathRef.addLine(to: CGPoint(x: bounds.maxX, y: bounds.minY))
        } else {
            pathRef.move(to: CGPoint(x: bounds.minX, y: bounds.minY))
            pathRef.addArc(tangent1End: CGPoint(x: bounds.minX, y: bounds.maxY),
                           tangent2End: CGPoint(x: bounds.midX, y: bounds.maxY),
                           radius: 0.0)
            
            pathRef.move(to: CGPoint(x: bounds.maxX, y: bounds.maxY))
            pathRef.addArc(tangent1End: CGPoint(x: bounds.maxX, y: bounds.maxY),
                           tangent2End: CGPoint(x: bounds.maxX, y: bounds.midY),
                           radius: 0.0)
            pathRef.addLine(to: CGPoint(x: bounds.maxX, y: bounds.minY))
            addLine = true
        }
        
        layer.path = pathRef
        layer.strokeColor = UIColor(fromHexString: "#D8D8D8")?.cgColor
        layer.lineWidth = 1.0
        layer.fillColor = UIColor.clear.cgColor
        
        if addLine == true {
            let lineLayer: CALayer = CALayer()
            let lineHeight: CGFloat = (1 / UIScreen.main.scale)
            lineLayer.frame = CGRect(x: bounds.minX, y: bounds.size.height - lineHeight, width: bounds.size.width, height: lineHeight)
            lineLayer.backgroundColor = UIColor.clear.cgColor
            layer.addSublayer(lineLayer)
        }
        
        let backgroundView: UIView = UIView(frame: bounds)
        backgroundView.layer.insertSublayer(layer, at: 0)
        backgroundView.backgroundColor = .clear
        cell.backgroundView = backgroundView
        
    }

Answer 9

我修改了上面发布的代码，现在此代码为部分创建了边框。在swift4.2中测试

func tableView(_ tableView: UITableView, willDisplay cell: UITableViewCell, forRowAt indexPath: IndexPath) {
        let cornerRadius: CGFloat = 24
        cell.backgroundColor = .clear

        let layer = CAShapeLayer()
        let pathRef = CGMutablePath()
        let bounds = cell.bounds.insetBy(dx: 10, dy: 0)
        var addLine = false

        if indexPath.row == 0 && indexPath.row == tableView.numberOfRows(inSection: indexPath.section) - 1 {
            pathRef.__addRoundedRect(transform: nil, rect: bounds, cornerWidth: cornerRadius, cornerHeight: cornerRadius)
        } else if indexPath.row == 0 {
            pathRef.move(to: .init(x: bounds.minX, y: bounds.maxY))
            pathRef.addArc(tangent1End: .init(x: bounds.minX, y: bounds.minY), tangent2End: .init(x: bounds.midX, y: bounds.minY), radius: cornerRadius)
            pathRef.addArc(tangent1End: .init(x: bounds.maxX, y: bounds.minY), tangent2End: .init(x: bounds.maxX, y: bounds.midY), radius: cornerRadius)
            pathRef.addLine(to: .init(x: bounds.maxX, y: bounds.maxY))
            addLine = true
        } else if indexPath.row == tableView.numberOfRows(inSection: indexPath.section) - 1 {
            pathRef.move(to: .init(x: bounds.minX, y: bounds.minY))
            pathRef.addArc(tangent1End: .init(x: bounds.minX, y: bounds.maxY), tangent2End: .init(x: bounds.midX, y: bounds.maxY), radius: cornerRadius)
            pathRef.addArc(tangent1End: .init(x: bounds.maxX, y: bounds.maxY), tangent2End: .init(x: bounds.maxX, y: bounds.midY), radius: cornerRadius)
            pathRef.addLine(to: .init(x: bounds.maxX, y: bounds.minY))
        } else {
           //pathRef.addRect(bounds)

            let pathInnerRef = CGMutablePath()
            pathInnerRef.move(to: .init(x: bounds.minX, y: bounds.minY))
            pathInnerRef.addLine(to: .init(x: bounds.minX, y: bounds.maxY))

            pathInnerRef.move(to: .init(x: bounds.maxX, y: bounds.minY))
            pathInnerRef.addLine(to: .init(x: bounds.maxX, y: bounds.maxY))
            pathRef.addPath(pathInnerRef)
            addLine = true
        }

        layer.path = pathRef
        layer.fillColor = UIColor.clear.cgColor
        layer.strokeColor = UIColor.black.cgColor


        if (addLine == true) {
            let lineLayer = CALayer()
            let lineHeight = 1.0 / UIScreen.main.scale
            lineLayer.frame = CGRect(x: bounds.minX + 10, y: bounds.size.height - lineHeight, width: bounds.size.width - 10, height: lineHeight)
            lineLayer.backgroundColor = UIColor.clear.cgColor//tableView.separatorColor?.cgColor
            lineLayer.addBorder(edge: .left, color: UIColor.black, thickness: 2.0)
            lineLayer.addBorder(edge: .right, color: UIColor.black, thickness: 2.0)
            layer.addSublayer(lineLayer)
        }


        let testView = UIView(frame: bounds)
        testView.layer.insertSublayer(layer, at: 0)
        testView.backgroundColor = .clear

        cell.backgroundView = testView   
}

UITableView部分周围的边框

9 个答案:

针对不同部分中不同行数的有效修复程序