43

我知道如何在 iOS 7 中为按钮添加边框，代码如下：

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

但是我怎样才能只添加一个边框？我只想添加顶部边框。

4

11 回答 11

69 
UIView *lineView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, btn.frame.size.width, 1)];
lineView.backgroundColor = [UIColor redColor];
[btn addSubview:lineView];

您可以对每个边框执行相同的操作。添加多个 UIView，您可以添加底部和左侧或顶部和右侧或任何您想要的边框。

即底部和左侧：

UIView *bottomBorder = [[UIView alloc] initWithFrame:CGRectMake(0, btn.frame.size.height - 1.0f, btn.frame.size.width, 1)];
bottomBorder.backgroundColor = [UIColor redColor];

UIView *leftBorder = [[UIView alloc] initWithFrame:CGRectMake(1, 0, 1, btn.frame.size.height)];
leftBorder.backgroundColor = [UIColor redColor];

[btn addSubview:bottomBorder];
[btn addSubview:leftBorder];

如果你不使用 ARC，记得在添加子视图后释放 UIViews（或使用自动释放）。

于 2014-02-16T12:53:46.270 回答
23

这是 masgar 在 Swift 中实现的解决方案：

var lineView = UIView(frame: CGRectMake(0, 0, btn.frame.size.width, 1))
lineView.backgroundColor=UIColor.redColor()
btn.addSubview(lineView)
于 2015-05-28T04:35:42.870 回答
21

在 Swift 中为 UIView 类添加一个扩展，如下所示：

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)
    }
}

我从这个链接得到了这个扩展：UIView bottom border?

然后像这样调用函数

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

对于自适应布局，请使用这个

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))
    }
}

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 回答
11

斯威夫特 4

UIButton 顶部边框

var lineView = UIView(frame: CGRect(x: 0, y: 0, width: button.frame.size.width, height: 2))
lineView.backgroundColor= UIColor.black
button.addSubview(lineView)

UIButton 底部边框

var lineView = UIView(frame: CGRect(x: 0, y: button.frame.size.height, width: button.frame.size.width, height: 2))
lineView.backgroundColor= UIColor.black
button.addSubview(lineView)
于 2018-08-27T08:50:46.770 回答
5

自己画边框：

@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 回答
4

其实我和你一样遇到这个问题，但我认为我的方法比你选择的答案更好。您应该创建一个继承 UIControl 的类，如 UIButton。

@interface customButton : UIButton

并像这样重写drawrect方法：

- (void)drawRect:(CGRect)rect {
    // Drawing code
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextSetLineCap(context, kCGLineCapRound);
    CGContextSetLineWidth(context, 1.5);  //线宽
    CGContextSetAllowsAntialiasing(context, true);
    CGContextSetRGBStrokeColor(context, 193/255.0, 205/255.0, 193/255.0, 1.0);  //线的颜色
    CGContextBeginPath(context);

    CGContextMoveToPoint(context, 0, 0);  //起点坐标
    CGContextAddLineToPoint(context, self.frame.size.width, 0);   //终点坐标

    CGContextStrokePath(context);
}

顺便说一句~你的目的 UIControl 应该在 xib 的设置中使用你的类

[![此设置][1]][1]

最后~展示我的自定义UIButton。我认为我们应该选择这种方法并结合 UIBezierPath 的 API 来完成我们的需求。

[![在此处输入图像描述][2]][2]

感谢收看~希望大家一起学习讨论~来自iOS渔夫——vvlong [1] ： https ://i.stack.imgur.com/ywIZk.png [2]：https://i.stack。 imgur.com/mmfOB.png

于 2016-10-15T13:52:13.300 回答
3

如果您使用约束，那么您可以添加具有所需约束的边框视图

// 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])
        }
    }
}

然后设置如下

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

（受此答案启发）

于 2018-10-15T10:23:30.163 回答
2

您不能使用此图层方法。
这里最好的解决方案是创建一个小图像（通过代码或 photoshop），使用 -(UIImage *)resizableImageWithCapInsets:(UIEdgeInsets)capInsets resizingMode:(UIImageResizingMode)resizingMode根据您想要提供的方面调整它的大小并将其添加为背景图像。这确实是一个很好的方法，因为它可以帮助您保持非常小的内存占用，并使您的图像适应所有按钮大小。
这里有一个很好的教程。

于 2013-11-10T15:10:51.207 回答
0

您必须创建一个新图层或查看 1pt 高，将其背景颜色设置为您想要的边框颜色，并将其添加为子视图/子图层。

于 2013-11-10T15:05:32.350 回答
-1

如果您需要除默认值以外的任何内容，则需要手动绘制它。

于 2013-11-10T15:09:21.097 回答
-1

最好最简单的方法...... 

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

使用过：这个开源代码

于 2015-08-19T06:26:23.417 回答