Ios 如何仅在UIButton上添加上边框？

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];

---

但我如何才能只添加一个边框我只想添加上边框

您必须创建一个1pt高的新图层或视图，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

如果您需要的不是默认值，则需要手动绘制。

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*）ResizebleimageWithCapinsets:（UIEdgeInsets）capInsets resizingMode:（UIImageResizingMode）resizingMode

根据您想要提供的外观调整大小，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的按钮大小

---

.

自己画边界即可：

@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

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、顶部和右侧或任何您想要的边框

i、 e.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];

---

如果不使用ARC，请记住在添加子视图后释放UIView（或使用autorelease）。

以下是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)

---

最简单的方法

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

---

在Swift中使用：

为UIView类添加如下扩展：

- (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);
}

**斯威夫特3***

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)
    }
}

我从这个链接获得了这个扩展：

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，请使用此选项

Swift 3

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)

---

事实上，我会像你一样遇到这些问题，但我认为我的方法比你选择的答案更好。 您应该创建一个类继承类似UIControl的UIButton

@interface customButton : UIButton

然后像这样重写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~给你看我的自定义按钮。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~ 来自一个iOS渔民——vvlong [1]:

---

[2] ：

Swift 4

ui按钮上边框

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

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)

ui按钮底部边框

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

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)

---

如果使用约束，则可以添加具有所需约束的边界视图

// 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])
        }
    }
}

然后设置如下所示

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

---

（灵感来源）

@Chris.Jenkins很奇怪，它不起作用。它应该与任何类型的UIButton一起工作，无论是从IB还是以编程方式。它可以添加一个子视图，具有按钮宽度和1px高度。尝试通过记录来检查按钮和线视图帧：NSLog（@“btn帧：%@”，NSStringFromCGRect（btn.frame））；如何在运行时删除此边框视图？当按钮动作被触发时，我需要移除边框。请回复@Masgar您可以为每个视图设置一个标记，并从superview中删除带有标记的视图。如何在边框上添加阴影@马斯加特关于影子，这里有很多答案。添加的边框是视图，可以使用QuartzCore向视图添加阴影。检查答案：如何在运行时删除此边框视图？当按钮动作被触发时，我需要移除边框。请回答。我自己还没有检查，但请尝试lineView.removeFromSuperview（）查看此项了解更多信息，因为我可能弄错了：对于自适应布局部件，您需要将常量值从1更改为“宽度”参数。@c_sharma感谢您，更正了我的错误并更新了自适应解决方案很酷，因为我的视图可能会发生很大变化，thanksI将边框添加为UIView（），但它不会显示。让它成为一个CALayer（）工作。谢谢回答得很好。调用者只需要一行代码，同时使用一个一致的枚举作为边。做得好。