TableView绘制分区圆角

_detailedTableView.separatorStyle = UITableViewCellSeparatorStyleNone;（如果分区上下出现不和谐线条请设置这个）

//绘制分区圆角

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

if ([cell respondsToSelector:@selector(tintColor)]) {

if (tableView == _detailedTableView) {

CGFloat cornerRadius = 10.f;

cell.backgroundColor = UIColor.clearColor;

CAShapeLayer *layer = [[CAShapeLayer alloc] init];

CGMutablePathRef pathRef = CGPathCreateMutable();

// 第一个参数,是整个 cell 的 bounds, 第二个参数是距左右两端的距离,第三个参数是距上下两端的距离

CGRect bounds = CGRectInset(cell.bounds, 0, 0);

BOOL addLine = NO;

//绘制圆角

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;

}

}

}