自定义UITableViewCell内的圆形UIView底角

时间:2018-10-24 23:15:21

标签: ios swift uitableview

我正在尝试在tableview单元格内舍入自定义视图的底角。我正在使用的代码无法正常工作,我也不明白为什么...

因此,我有一个UItableViewCell,在contentView内有一个自定义视图containerView。在其中,顶部是两个标签,底部是另一个视图。该视图必须具有圆角。

我的代码:

class HomeTableViewCell: UITableViewCell {

var containerView: UIView!
var bottomDetailsView: UIView!
var titleLabel: UILabel!
var timeLabel: UILabel!

override init(style: UITableViewCell.CellStyle, reuseIdentifier: String?) {
    super.init(style: style, reuseIdentifier: "tableCell")

    containerView = UIView()
    bottomDetailsView = UIView()
    timeLabel = UILabel()
    titleLabel = UILabel()


    self.contentView.addSubview(containerView)
    containerView.addSubview(bottomDetailsView)
    containerView.addSubview(titleLabel)
    containerView.addSubview(timeLabel)

    containerView.snp.makeConstraints({ (maker) in
        maker.top.equalTo(self.contentView.snp.top)
        maker.bottom.equalTo(self.contentView.snp.bottom)
        maker.left.equalTo(self.contentView.snp.left).inset(10)
        maker.right.equalTo(self.contentView.snp.right).inset(10)
    })

    bottomDetailsView.snp.makeConstraints { (maker) in
        maker.top.equalTo(containerView.snp.centerY).offset(30)
        maker.left.equalTo(containerView.snp.left)
        maker.right.equalTo(containerView.snp.right)
        maker.bottom.equalTo(containerView.snp.bottom)
    }

    timeLabel.snp.makeConstraints { (maker) in
        maker.centerX.equalTo(containerView.snp.centerX)
        maker.centerY.equalTo(containerView.snp.centerY).offset(10)
    }

    titleLabel.snp.makeConstraints { (maker) in
        maker.left.equalTo(containerView.snp.left).inset(10)
        maker.top.equalTo(containerView.snp.top).inset(10)
        maker.right.equalTo(containerView.snp.right).inset(10)
    }
}

override func layoutSubviews() {
    super.layoutSubviews()

    bottomDetailsView.backgroundColor = #colorLiteral(red: 0.9607843161, green: 0.7058823705, blue: 0.200000003, alpha: 1)
    containerView.backgroundColor = #colorLiteral(red: 0.4666666687, green: 0.7647058964, blue: 0.2666666806, alpha: 1)
    containerView.layer.cornerRadius = 15.0
    timeLabel.font = timeLabel.font.withSize(24)
    timeLabel.textColor = #colorLiteral(red: 1.0, green: 1.0, blue: 1.0, alpha: 1.0)
    titleLabel.textColor = #colorLiteral(red: 1.0, green: 1.0, blue: 1.0, alpha: 1.0)

    let path = UIBezierPath(roundedRect: bottomDetailsView.bounds, byRoundingCorners: [.bottomLeft, .bottomRight], cornerRadii: CGSize(width: 15, height: 15))
    let shapeLayer = CAShapeLayer()
    shapeLayer.frame = bottomDetailsView.frame
    shapeLayer.path = path.cgPath
    bottomDetailsView.layer.backgroundColor = UIColor.red.cgColor
    bottomDetailsView.layer.mask = shapeLayer
}


required init?(coder aDecoder: NSCoder) {
    fatalError("init(coder:) has not been implemented")
}
}

我正在使用SnapKit进行自动布局。有问题的代码是

let path = UIBezierPath(roundedRect: bottomDetailsView.bounds, byRoundingCorners: [.bottomLeft, .bottomRight], cornerRadii: CGSize(width: 15, height: 15))
let shapeLayer = CAShapeLayer()
shapeLayer.frame = bottomDetailsView.frame
shapeLayer.path = path.cgPath
bottomDetailsView.layer.backgroundColor = UIColor.red.cgColor
bottomDetailsView.layer.mask = shapeLayer

我尝试使用此代码进行不同的组合,但无法正常工作。它绝对不会显示任何内容。如果我写的是bottomDetailsView.layer.mask = shapeLayer而不是bottomDetailsView.layer.addSublayer(shapeLayer),则显示的是视图,但没有四角。

我不记得自己做了什么,但是在某个时候,我意识到我在视图顶部看到了一个黑色的圆形层,但前提是该单元格位于屏幕之外,然后再次加载了{{1} }。我在互联网上找到的每个解决方案都指向我拥有的相同代码,也许必须在其他地方完成?

编辑1:

得到答案后,我更新了代码,现在看起来像这样:

dequeueReuseableCell

我也按照Duncan C的建议做了UIView的子类:

class HomeTableViewCell: UITableViewCell {

var containerView: UIView!
var bottomDetailsView: BottomDetailsView!
var titleLabel: UILabel!
var timeLabel: UILabel!

override init(style: UITableViewCell.CellStyle, reuseIdentifier: String?) {
    super.init(style: style, reuseIdentifier: "tableCell")

    containerView = UIView()
    bottomDetailsView = BottomDetailsView(frame: .zero)
    timeLabel = UILabel()
    titleLabel = UILabel()

    self.contentView.addSubview(containerView)

    containerView.addSubview(titleLabel)
    containerView.addSubview(timeLabel)
    containerView.addSubview(bottomDetailsView)

    containerView.snp.makeConstraints({ (maker) in
        maker.top.bottom.left.right.equalToSuperview()
    })

    titleLabel.snp.makeConstraints { (maker) in
        maker.height.equalTo(15)
        maker.top.left.right.equalTo(containerView)
        maker.bottom.equalTo(timeLabel.snp.top)
    }

    timeLabel.snp.makeConstraints { (maker) in
        maker.height.equalTo(34)
        maker.top.equalTo(titleLabel.snp.bottom)
        maker.centerX.equalTo(containerView.snp.centerX)
        maker.bottom.equalTo(bottomDetailsView.snp.top)
    }
    bottomDetailsView.snp.makeConstraints { (maker) in
        maker.top.equalTo(timeLabel.snp.bottom)
        maker.left.equalTo(containerView.snp.left)
        maker.right.equalTo(containerView.snp.right)
        maker.bottom.equalTo(containerView.snp.bottom)
    }
}

override func layoutSubviews() {
    super.layoutSubviews()

    bottomDetailsView.backgroundColor = #colorLiteral(red: 0.9607843161, green: 0.7058823705, blue: 0.200000003, alpha: 1)

    containerView.backgroundColor = #colorLiteral(red: 0.4666666687, green: 0.7647058964, blue: 0.2666666806, alpha: 1)
    containerView.layer.cornerRadius = 15.0

    timeLabel.font = timeLabel.font.withSize(24)
    timeLabel.textColor = #colorLiteral(red: 1.0, green: 1.0, blue: 1.0, alpha: 1.0)
    titleLabel.textColor = #colorLiteral(red: 1.0, green: 1.0, blue: 1.0, alpha: 1.0)
    titleLabel.numberOfLines = 0
}


required init?(coder aDecoder: NSCoder) {
    fatalError("init(coder:) has not been implemented")
}
}

现在一切正常,除了以下事实:如果我放大,如果我努力看的话,我可以在角落看到一点点下面的视图。它们没有完全对齐。底线还可以,就在角落。

2 个答案:

答案 0 :(得分:1)

当您提供containerView时,您的约束不足以布置单元格的子视图

  

顶部,左侧,右侧,底部

和标签timeLabel

  

centerX,Y

titleLabel

  

左,右,上

如果您查看这些约束,则没有从上到下垂直创建约束from,单元格期望它是其子视图containeView的高度,但是您要进行相反的操作,因此您需要挂钩标签titleLabel到容器的顶部(您已完成),它在标签timeLabel的底部,容器的底部到容器的底部,并且容器的底部已经被钩到{{1} },这就是自动布局可以计算出正确的单元格高度的方式,通过这种方式,任何舍入都会显示

顺便说一句::我不知道您想要的设计,但是您必须遵循从上到下的约束约束,不仅要显示舍入,而且更重要的是要显示所需的视图将舍入应用于

答案 1 :(得分:1)

用于添加CAShapeLayer作为视图的蒙版层的代码非常接近。这行:

shapeLayer.frame = bottomDetailsView.frame

应阅读

shapeLayer.frame = bottomDetailsView.bounds

视图/图层的框架以其超级视图的坐标系表示。视图的边界定义了它的坐标系。

我没有尝试过复杂的表视图案例,但是我确实创建了UIView的子类,该子类创建了一个底部取整的掩码:

class RoundedBottomCornersView: UIView {
    var shapeLayer: CAShapeLayer!

    //If the view's bounds change, update the shapeLayer's frame and also rebuild the path
    override var bounds: CGRect {
        didSet {
            shapeLayer.frame = self.bounds
            createShapeLayerPath()
        }
    }

    func createShapeLayerPath() {
        let path = UIBezierPath(roundedRect: bounds,
                                byRoundingCorners: [.bottomLeft, .bottomRight],
                                cornerRadii: CGSize(width: 15, height: 15))
        shapeLayer.path = path.cgPath
    }

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        layer.borderWidth = 1.0

        shapeLayer = CAShapeLayer()
        shapeLayer.frame = bounds
        layer.backgroundColor = UIColor.red.cgColor
        layer.mask = shapeLayer
    }
}