Question

我试图在UIImageView上使用CALayer添加虚线边框。我找到了一种方法，但是它在swift中工作，我怎样才能将它转换为swift？ o有另一个带有边框的imageView，这将是使用CALayer的最佳解决方案，所以它们看起来相似吗？我怎样才能获得这个

快速的obj-c代码？

- (CAShapeLayer *) addDashedBorderWithColor: (CGColorRef) color {
    CAShapeLayer *shapeLayer = [CAShapeLayer layer];

    CGSize frameSize = self.size;

    CGRect shapeRect = CGRectMake(0.0f, 0.0f, frameSize.width, frameSize.height);
    [shapeLayer setBounds:shapeRect];
    [shapeLayer setPosition:CGPointMake( frameSize.width/2,frameSize.height/2)];

    [shapeLayer setFillColor:[[UIColor clearColor] CGColor]];
    [shapeLayer setStrokeColor:color];
    [shapeLayer setLineWidth:5.0f];
    [shapeLayer setLineJoin:kCALineJoinRound];
    [shapeLayer setLineDashPattern:
    [NSArray arrayWithObjects:[NSNumber numberWithInt:10],
    [NSNumber numberWithInt:5],
  nil]];
    UIBezierPath *path = [UIBezierPath bezierPathWithRoundedRect:shapeRect cornerRadius:15.0];
    [shapeLayer setPath:path.CGPath];

    return shapeLayer;
}

Answer 1

好的，我会在自定义视图类中执行此操作：

class DashedBorderView: UIView {

    let _border = CAShapeLayer()

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        setup()
    }

    init() {
        super.init(frame: CGRectZero)
        setup()
    }

    func setup() {
        _border.strokeColor = UIColor.whiteColor().CGColor
        _border.fillColor = nil
        _border.lineDashPattern = [4, 4]
        self.layer.addSublayer(_border)
    }

    override func layoutSubviews() {
        super.layoutSubviews()
        _border.path = UIBezierPath(roundedRect: self.bounds, cornerRadius:8).CGPath
        _border.frame = self.bounds
    }
}

Answer 2

首先尝试将代码转换为Swift。如果您遇到问题，请发布您遇到的问题。

我会帮你的：

func addDashedBorderWithColor(color: UIColor) -> CAShapeLayer {
    let shapeLayer = CAShapeLayer()

    let frameSize = self.bounds.size
    let shapeRect = CGRect(x: 0, y: 0, width: frameSize.width, height: frameSize.height)
    shapeLayer.bounds = shapeRect
    //...

Answer 3

针对Swift 3进行了更新：

如果你想让你的ImageView / UIView / UILabel / UITextField成为虚线边框，那么在简单的代码行下使用;

func makeDashedBorder()  {

    let mViewBorder = CAShapeLayer()
    mViewBorder.strokeColor = UIColor.magenta.cgColor
    mViewBorder.lineDashPattern = [2, 2]
    mViewBorder.frame = mYourAnyTypeOfView.bounds
    mViewBorder.fillColor = nil
    mViewBorder.path = UIBezierPath(rect: mYourAnyTypeOfView.bounds).cgPath
    mYourAnyTypeOfView.layer.addSublayer(mViewBorder)
}

//注意：其中，mYourAnyTypeOfView = UIView / UIImageView / UILabel / UITextField等

//享受编码..！

虚线边框UIImageView swift

3 个答案: