一些特殊UI设置

1.PickerView设置选中行样式

比如需要设置背景色,在自定义pickerView的layoutSubviews方法中添加代码:

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//修改选中行的背景色
for (UIView *subView in self.subviews) {
if(subView.subviews.count){
UIView *contentView = subView.subviews[0];
for (UIView *contentSubView in contentView.subviews) {
if(contentSubView.center.y == contentView.center.y){
if(_selectBackView != contentSubView){
_selectBackView.backgroundColor = [UIColor clearColor];
_selectBackView = contentSubView;
_selectBackView.backgroundColor = kColorFromHex(0xEBEBEB);
}
break;
}
}
break;
}

2.TableView的Section设置整体边框效果

在tableView代理类中,添加如下代码(可以使用CGPath,也可以用UIBezierPath):

OC版代码(使用了CGPath)
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- (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath {
// 圆角弧度半径
CGFloat cornerRadius = 10.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
// 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, 14, 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
// CGRectGetMidX: 返回对象中心点的X坐标
// CGRectGetMidY: 返回对象中心点的Y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

// 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p,(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));

CGPathCloseSubpath(pathRef);

} 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);
}
// 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;
layer.strokeColor = [UIColor clearColor].CGColor;

// 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 = VIEW_COLOR;
// cell的背景view
cell.backgroundView = roundView;

// 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
// 如果你 cell 已经取消选中状态的话,那以下方法是不需要的.
UIView *selectedBackgroundView = [[UIView alloc] initWithFrame:bounds];
backgroundLayer.fillColor = [UIColor whiteColor].CGColor;
[selectedBackgroundView.layer insertSublayer:backgroundLayer atIndex:0];
selectedBackgroundView.backgroundColor = UIColor.clearColor;
cell.selectedBackgroundView = selectedBackgroundView;
}

Swift版(使用了UIBezierPath)
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func tableView(_ tableView: UITableView, willDisplay cell: UITableViewCell, forRowAt indexPath: IndexPath) {
let rowsCount:Int = tableView.numberOfRows(inSection: indexPath.section)

if indexPath.row == 0 {

let path:UIBezierPath = UIBezierPath.init(roundedRect: CGRect(x: 14, y: 0, width: cell.contentView.width - 14 * 2, height: cell.contentView.height), byRoundingCorners: [.topLeft,.topRight], cornerRadii: CGSize(width: 10, height: 0))

let shapLayer:CAShapeLayer = CAShapeLayer()
shapLayer.lineWidth = 1
shapLayer.strokeColor = UIColor.white.cgColor
shapLayer.fillColor = UIColor.clear.cgColor
shapLayer.path = path.cgPath
let maskLayer:CAShapeLayer = CAShapeLayer.init()
maskLayer.path = path.cgPath
cell.layer.mask = maskLayer
cell.layer.addSublayer(shapLayer)

}else if indexPath.row == rowsCount - 1 {

let path:UIBezierPath = UIBezierPath.init(roundedRect: CGRect(x: 14, y: 0, width: cell.contentView.width - 14 * 2, height: cell.contentView.height), byRoundingCorners: [.bottomLeft,.bottomRight], cornerRadii: CGSize(width: 10, height: 0))
let shapLayer:CAShapeLayer = CAShapeLayer()
shapLayer.lineWidth = 1
shapLayer.strokeColor = UIColor.white.cgColor
shapLayer.fillColor = UIColor.clear.cgColor
shapLayer.path = path.cgPath
let maskLayer:CAShapeLayer = CAShapeLayer.init()
maskLayer.path = path.cgPath
cell.layer.mask = maskLayer
cell.layer.addSublayer(shapLayer)

}else{
let path:UIBezierPath = UIBezierPath.init(roundedRect: CGRect(x: 14, y: 0, width: cell.contentView.width - 14 * 2, height: cell.contentView.height), byRoundingCorners: [.topLeft,.topRight], cornerRadii: CGSize(width: 0, height: 0))
let shapLayer:CAShapeLayer = CAShapeLayer()
shapLayer.lineWidth = 1
shapLayer.strokeColor = UIColor.white.cgColor
shapLayer.fillColor = UIColor.clear.cgColor
shapLayer.path = path.cgPath
let maskLayer:CAShapeLayer = CAShapeLayer.init()
maskLayer.path = path.cgPath
cell.layer.mask = maskLayer
cell.layer.addSublayer(shapLayer)
}
}