UITableView部分周围的边框
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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。
答案
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
另一答案
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
}
}
另一答案
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);
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