Question

我知道如何使用以下代码为iOS 7中的按钮添加边框：

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

但我怎样才能添加一个边框？ 我只想添加顶部边框。

Answer 1

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

你可以为每个边界做同样的事情。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＆amp;左：

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];

如果您不使用ARC，请记住在添加子视图（或使用自动释放）后发布UIViews。

Answer 2

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)

Answer 3

在Swift中为UIView类添加一个扩展名，如下所示：

Swift 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)
}
}

我从此链接获得了此扩展程序：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，请使用此

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)

Answer 4

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

Answer 5

其实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要好。您应该创建一个类继承UIControl，如UIButton。

@interface customButton : UIButton

并重写drawrect方法，如下所示：

- (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的设置中使用你的课程

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

感谢您的收看〜希望一起学习和讨论〜来自iOS渔夫 - vvlong

Answer 6

快捷键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)

Answer 7

您无法使用此图层方法。
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根据您想要的方面调整大小，并将其添加为背景图像。这确实是一种很好的方法，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。
Here a good tutorial

Answer 8

如果使用约束，则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])
        }
    }
}

然后将其设置如下所示

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

（受this answer启发）

Answer 9

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

Answer 10

如果您需要除默认值以外的任何其他内容，则需要手动绘制它。

Answer 11

最简单的方式......

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

是否使用过：this open source code

如何在UIButton上只添加TOP边框？

11 个答案: