43

次のコードを使用して、iOS 7 のボタンに境界線を追加する方法を知っています。

[[myButton layer] setBorderColor:[[[UIColor grayColor] colorWithAlphaComponent:0.5] CGColor]];
[[myButton layer] setBorderWidth:1];
[[myButton layer] setCornerRadius:15];

しかし、どうすればボーダーを 1 つだけ追加できますか? 上枠のみ追加したい。

4

11 に答える 11

21

Swift では、次のように UIView クラスの拡張機能を追加します。

extension UIView {
    func addTopBorderWithColor(color: UIColor, width: CGFloat) {
        let border = CALayer()
        border.backgroundColor = color.cgColor
        border.frame = CGRect(x:0,y: 0, width:self.frame.size.width, height:width)
        self.layer.addSublayer(border)
    }

    func addRightBorderWithColor(color: UIColor, width: CGFloat) {
        let border = CALayer()
        border.backgroundColor = color.cgColor
        border.frame = CGRect(x: self.frame.size.width - width,y: 0, width:width, height:self.frame.size.height)
        self.layer.addSublayer(border)
    }

    func addBottomBorderWithColor(color: UIColor, width: CGFloat) {
        let border = CALayer()
        border.backgroundColor = color.cgColor
        border.frame = CGRect(x:0, y:self.frame.size.height - width, width:self.frame.size.width, height:width)
        self.layer.addSublayer(border)
    }

    func addLeftBorderWithColor(color: UIColor, width: CGFloat) {
        let border = CALayer()
        border.backgroundColor = color.cgColor
        border.frame = CGRect(x:0, y:0, width:width, height:self.frame.size.height)
        self.layer.addSublayer(border)
    }
}

このリンクからこの拡張機能を取得しました: UIView 下の境界線?

次に、このように関数を呼び出します

var innerView : UIView?
let borderWidth: CGFloat = 1.0
let borderColor : UIColor =  UIColor.redColor()
innerView!.addTopBorderWithColor(borderColor, width: borderWidth)

アダプティブレイアウトの場合、これを使用します

extension UIView {

    func addTopBorder(_ color: UIColor, height: CGFloat) {
        let border = UIView()
        border.backgroundColor = color
        border.translatesAutoresizingMaskIntoConstraints = false
        self.addSubview(border)
        border.addConstraint(NSLayoutConstraint(item: border,
            attribute: NSLayoutAttribute.height,
            relatedBy: NSLayoutRelation.equal,
            toItem: nil,
            attribute: NSLayoutAttribute.height,
            multiplier: 1, constant: height))
        self.addConstraint(NSLayoutConstraint(item: border,
            attribute: NSLayoutAttribute.top,
            relatedBy: NSLayoutRelation.equal,
            toItem: self,
            attribute: NSLayoutAttribute.top,
            multiplier: 1, constant: 0))
        self.addConstraint(NSLayoutConstraint(item: border,
            attribute: NSLayoutAttribute.leading,
            relatedBy: NSLayoutRelation.equal,
            toItem: self,
            attribute: NSLayoutAttribute.leading,
            multiplier: 1, constant: 0))
        self.addConstraint(NSLayoutConstraint(item: border,
            attribute: NSLayoutAttribute.trailing,
            relatedBy: NSLayoutRelation.equal,
            toItem: self,
            attribute: NSLayoutAttribute.trailing,
            multiplier: 1, constant: 0))
    }

    func addBottomBorder(_ color: UIColor, height: CGFloat) {
        let border = UIView()
        border.backgroundColor = color
        border.translatesAutoresizingMaskIntoConstraints = false
        self.addSubview(border)
        border.addConstraint(NSLayoutConstraint(item: border,
            attribute: NSLayoutAttribute.height,
            relatedBy: NSLayoutRelation.equal,
            toItem: nil,
            attribute: NSLayoutAttribute.height,
            multiplier: 1, constant: height))
        self.addConstraint(NSLayoutConstraint(item: border,
            attribute: NSLayoutAttribute.bottom,
            relatedBy: NSLayoutRelation.equal,
            toItem: self,
            attribute: NSLayoutAttribute.bottom,
            multiplier: 1, constant: 0))
        self.addConstraint(NSLayoutConstraint(item: border,
            attribute: NSLayoutAttribute.leading,
            relatedBy: NSLayoutRelation.equal,
            toItem: self,
            attribute: NSLayoutAttribute.leading,
            multiplier: 1, constant: 0))
        self.addConstraint(NSLayoutConstraint(item: border,
            attribute: NSLayoutAttribute.trailing,
            relatedBy: NSLayoutRelation.equal,
            toItem: self,
            attribute: NSLayoutAttribute.trailing,
            multiplier: 1, constant: 0))
    }

    func addLeftBorder(_ color: UIColor, width: CGFloat) {
        let border = UIView()
        border.backgroundColor = color
        border.translatesAutoresizingMaskIntoConstraints = false
        self.addSubview(border)
        border.addConstraint(NSLayoutConstraint(item: border,
            attribute: NSLayoutAttribute.width,
            relatedBy: NSLayoutRelation.equal,
            toItem: nil,
            attribute: NSLayoutAttribute.width,
            multiplier: 1, constant: width))
        self.addConstraint(NSLayoutConstraint(item: border,
            attribute: NSLayoutAttribute.leading,
            relatedBy: NSLayoutRelation.equal,
            toItem: self,
            attribute: NSLayoutAttribute.leading,
            multiplier: 1, constant: 0))
        self.addConstraint(NSLayoutConstraint(item: border,
            attribute: NSLayoutAttribute.bottom,
            relatedBy: NSLayoutRelation.equal,
            toItem: self,
            attribute: NSLayoutAttribute.bottom,
            multiplier: 1, constant: 0))
        self.addConstraint(NSLayoutConstraint(item: border,
            attribute: NSLayoutAttribute.top,
            relatedBy: NSLayoutRelation.equal,
            toItem: self,
            attribute: NSLayoutAttribute.top,
            multiplier: 1, constant: 0))
    }

    func addRightBorder(_ color: UIColor, width: CGFloat) {
        let border = UIView()
        border.backgroundColor = color
        border.translatesAutoresizingMaskIntoConstraints = false
        self.addSubview(border)
        border.addConstraint(NSLayoutConstraint(item: border,
            attribute: NSLayoutAttribute.width,
            relatedBy: NSLayoutRelation.equal,
            toItem: nil,
            attribute: NSLayoutAttribute.width,
            multiplier: 1, constant: width))
        self.addConstraint(NSLayoutConstraint(item: border,
            attribute: NSLayoutAttribute.trailing,
            relatedBy: NSLayoutRelation.equal,
            toItem: self,
            attribute: NSLayoutAttribute.trailing,
            multiplier: 1, constant: 0))
        self.addConstraint(NSLayoutConstraint(item: border,
            attribute: NSLayoutAttribute.bottom,
            relatedBy: NSLayoutRelation.equal,
            toItem: self,
            attribute: NSLayoutAttribute.bottom,
            multiplier: 1, constant: 0))
        self.addConstraint(NSLayoutConstraint(item: border,
            attribute: NSLayoutAttribute.top,
            relatedBy: NSLayoutRelation.equal,
            toItem: self,
            attribute: NSLayoutAttribute.top,
            multiplier: 1, constant: 0))
    }
}

使用法：

button!.addTopBorder(UIColor(red: 247.0/255.0, green: 147.0/255.0, blue: 29.0/255.0, alpha: 0.5), height: borderWidth)
于 2016-05-03T07:51:11.510 に答える
5

自分で境界線を引くだけです：

@implementation TopBorderButton
- (void)drawRect:(CGRect)rect
{
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextSetFillColorWithColor(context, [UIColor redColor].CGColor);
    CGContextFillRect(context, CGRectMake(0.0f, 0.0, self.frame.size.width, 1.0));
}
@end
于 2013-11-10T16:19:25.447 に答える
3

制約を使用する場合は、必要な制約を含む境界ビューを追加できます

// MARK: - Add a border to one side of a view

public enum BorderSide {
    case top, bottom, left, right
}

extension UIView {
    public func addBorder(side: BorderSide, color: UIColor, width: CGFloat) {
        let border = UIView()
        border.translatesAutoresizingMaskIntoConstraints = false
        border.backgroundColor = color
        self.addSubview(border)

        let topConstraint = topAnchor.constraint(equalTo: border.topAnchor)
        let rightConstraint = trailingAnchor.constraint(equalTo: border.trailingAnchor)
        let bottomConstraint = bottomAnchor.constraint(equalTo: border.bottomAnchor)
        let leftConstraint = leadingAnchor.constraint(equalTo: border.leadingAnchor)
        let heightConstraint = border.heightAnchor.constraint(equalToConstant: width)
        let widthConstraint = border.widthAnchor.constraint(equalToConstant: width)


        switch side {
        case .top:
            NSLayoutConstraint.activate([leftConstraint, topConstraint, rightConstraint, heightConstraint])
        case .right:
            NSLayoutConstraint.activate([topConstraint, rightConstraint, bottomConstraint, widthConstraint])
        case .bottom:
            NSLayoutConstraint.activate([rightConstraint, bottomConstraint, leftConstraint, heightConstraint])
        case .left:
            NSLayoutConstraint.activate([bottomConstraint, leftConstraint, topConstraint, widthConstraint])
        }
    }
}

次に、以下のように設定します

myButton.addBorder(side: .left, color: UIColor.lightGray, width: 1)

（この回答に触発されました）

于 2018-10-15T10:23:30.163 に答える
0

新しいレイヤーを作成するか、1pt の高さを表示し、その背景色を境界線の色に設定し、それをサブビュー/サブレイヤーとして追加する必要があります。

于 2013-11-10T15:05:32.350 に答える
-1

最良かつ簡単な方法.... 

btnTest.selectiveBorderFlag = AUISelectiveBordersFlagBottom | AUISelectiveBordersFlagTop;
btnTest.selectiveBordersColor = [UIColor redColor];
btnTest.selectiveBordersWidth = 3.0;

を使用してそれを行いました：このオープンソースコード

于 2015-08-19T06:26:23.417 に答える