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。
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/粘贴应该工作），它也适用于分组表。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
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
}
}
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。
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];
}
我使用tableView的reloadData方法来重绘单元格，我认为这不是最好的方法。请在评论中建议替代方法，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addBorder:forView方法，然后再从委托中返回。
您可以使用UITableViewStyleGrouped tableview部分样式。
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
}
}
这是Swift3版本的答案：
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
}
我修改了以上发布的代码，现在这段代码为section创建了边框。在swift4.2中测试过
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
}