有的方法是用第三方,有的是用cell嵌套tableview,都太复杂
下面有个很简单的方法:
步骤1:
// 设置自定义Cell的边距
-(void)setFrame:(CGRect)frame{
CGFloat margin = 20;
frame.origin.x = margin;
frame.size.width = kScreenWidth - margin*2;
[super setFrame:frame];
}
步骤2:
- (CGFloat)tableView:(UITableView *)tableView heightForFooterInSection:(NSInteger)section{
return 15;
}
- (UIView *)tableView:(UITableView *)tableView viewForFooterInSection:(NSInteger)section{
return UIView.new;
}
// 设置TableView将要显示Cell的代理方法
// 首先给让cell左右偏移一点的距离,通过重写cell的setframe方法来实现
// 实现tableView的willDisplayCell方法,给section绘制圆角
- (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath
{
if ([cell respondsToSelector:@selector(tintColor)]) {
if (tableView == self.tableView) {
// 圆角弧度半径
CGFloat cornerRadius = 5.f;
// 设置cell的背景色为透明,如果不设置这个的话,则原来的背景色不会被覆盖
cell.backgroundColor = UIColor.clearColor;
// 创建一个shapeLayer
CAShapeLayer *layer = [[CAShapeLayer alloc] init];
CAShapeLayer *backgroundLayer = [[CAShapeLayer alloc] init]; //显示选中
// 创建一个可变的图像Path句柄,该路径用于保存绘图信息
CGMutablePathRef pathRef = CGPathCreateMutable();
// 获取cell的size
CGRect bounds = CGRectInset(cell.bounds, 0, 0);
// CGRectGetMinY:返回对象顶点坐标
// CGRectGetMaxY:返回对象底点坐标
// CGRectGetMinX:返回对象左边缘坐标
// CGRectGetMaxX:返回对象右边缘坐标
// 这里要判断分组列表中的第一行,每组section的第一行,每组section的中间行
BOOL addLine = NO;
// CGPathAddRoundedRect(pathRef, nil, bounds, cornerRadius, cornerRadius);
if (indexPath.row == 0) {
// 初始起点为cell的左下角坐标
CGPathMoveToPoint(pathRef, nil, CGRectGetMinX(bounds), CGRectGetMaxY(bounds));
// 起始坐标为左下角,设为p1,(CGRectGetMinX(bounds), CGRectGetMinY(bounds))为左上角的点,设为p1(x1,y1),(CGRectGetMidX(bounds), CGRectGetMinY(bounds))为顶部中点的点,设为p2(x2,y2)。然后连接p1和p2为一条直线l1,连接初始点p到p1成一条直线l,则在两条直线相交处绘制弧度为r的圆角。
CGPathAddArcToPoint(pathRef, nil, CGRectGetMinX(bounds), CGRectGetMinY(bounds), CGRectGetMidX(bounds), CGRectGetMinY(bounds), cornerRadius);
CGPathAddArcToPoint(pathRef, nil, CGRectGetMaxX(bounds), CGRectGetMinY(bounds), CGRectGetMaxX(bounds), CGRectGetMidY(bounds), cornerRadius);
// 终点坐标为右下角坐标点,把绘图信息都放到路径中去,根据这些路径就构成了一块区域了
CGPathAddLineToPoint(pathRef, nil, CGRectGetMaxX(bounds), CGRectGetMaxY(bounds));
// addLine = YES;
} else if (indexPath.row == [tableView numberOfRowsInSection:indexPath.section]-1) {
// 初始起点为cell的左上角坐标
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);
// 添加一条直线,终点坐标为右下角坐标点并放到路径中去
CGPathAddLineToPoint(pathRef, nil, CGRectGetMaxX(bounds), CGRectGetMinY(bounds));
} else {
// 添加cell的rectangle信息到path中(不包括圆角)
CGPathAddRect(pathRef, nil, bounds);
// addLine = YES;
}
// 把已经绘制好的可变图像路径赋值给图层,然后图层根据这图像path进行图像渲染render
layer.path = pathRef;
backgroundLayer.path = pathRef;
// 注意:但凡通过Quartz2D中带有creat/copy/retain方法创建出来的值都必须要释放
CFRelease(pathRef);
// 按照shape layer的path填充颜色,类似于渲染render
// layer.fillColor = [UIColor colorWithWhite:1.f alpha:0.8f].CGColor;
layer.fillColor = [UIColor whiteColor].CGColor;
// 添加分隔线图层
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);
// 分隔线颜色取自于原来tableview的分隔线颜色
lineLayer.backgroundColor = tableView.separatorColor.CGColor;
[layer addSublayer:lineLayer];
}
// view大小与cell一致
UIView *roundView = [[UIView alloc] initWithFrame:bounds];
// 添加自定义圆角后的图层到roundView中
[roundView.layer insertSublayer:layer atIndex:0];
roundView.backgroundColor = UIColor.clearColor;
//cell的背景view
//cell.selectedBackgroundView = roundView;
cell.backgroundView = roundView;
// 设置阴影,待调试
// CAShapeLayer *shadow = [CAShapeLayer layer];
//
// shadow.shadowColor = [UIColor blackColor].CGColor;
//
// shadow.shadowOffset=CGSizeMake(0,0);
//
// shadow.shadowOpacity=0.15;
//
// [roundView.layer addSublayer:shadow];
//
//// roundView.shadowLayer = shadow;
// UIBezierPath*bgBezierPath = nil;
// CGFloat cornerRaduis = 7.0;//觉得阴影大的可以把半径调小,半径大的话阴影面积会变大
// if (indexPath.row == 0) {
// roundView.clipsToBounds=YES;
//
//// roundView.frame = cell.bounds;
//
// CGRect rect = UIEdgeInsetsInsetRect(roundView.bounds, UIEdgeInsetsMake(0, 5, 0, 5));
//
// bgBezierPath = [UIBezierPath bezierPathWithRoundedRect:rect byRoundingCorners:(UIRectCornerTopLeft|UIRectCornerTopRight) cornerRadii:CGSizeMake(cornerRaduis, cornerRaduis)];
// } else if (indexPath.row == [tableView numberOfRowsInSection:indexPath.section]-1) {
// roundView.clipsToBounds=NO;
//
//// roundView.frame = UIEdgeInsetsInsetRect(cell.bounds, UIEdgeInsetsMake(0, 0, -5, 0));
//
// CGRect rect = UIEdgeInsetsInsetRect(roundView.bounds, UIEdgeInsetsMake(0, 5, 5, 5));
//
// bgBezierPath = [UIBezierPath bezierPathWithRoundedRect:rect byRoundingCorners:(UIRectCornerBottomLeft|UIRectCornerBottomRight) cornerRadii:CGSizeMake(cornerRaduis, cornerRaduis)];
// } else {
// roundView.clipsToBounds=YES;
//
//// roundView.frame = UIEdgeInsetsInsetRect(cell.bounds, UIEdgeInsetsMake(0, 0, 0, 0));
//
// CGRect rect = UIEdgeInsetsInsetRect(roundView.bounds, UIEdgeInsetsMake(0, 5, 0, 5));
//
// bgBezierPath = [UIBezierPath bezierPathWithRect:rect];
//
// }
//
// cell.contentView.backgroundColor = UIColor.clearColor;
//
// shadow.path= bgBezierPath.CGPath;
//
// shadow.shadowPath= bgBezierPath.CGPath;
//
// shadow.fillColor = [UIColor whiteColor].CGColor;
//以上方法存在缺陷当点击cell时还是出现cell方形效果,因此还需要添加以下方法
UIView *selectedBackgroundView = [[UIView alloc] initWithFrame:bounds];
backgroundLayer.fillColor = tableView.separatorColor.CGColor;
[selectedBackgroundView.layer insertSublayer:backgroundLayer atIndex:0];
selectedBackgroundView.backgroundColor = UIColor.clearColor;
cell.selectedBackgroundView = selectedBackgroundView;
}
}
}
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