在Swift中从ViewController更改UIView变量

Question

我最近和Swift一直磕磕绊绊，并且遇到了一个我认为我理解的概念，但似乎无法让它正常工作。

在我的应用程序中，我有一个ViewController，其中包含我在IB中添加的View。我已将我的View的Custom Class设置为“RingView”，它存在于我的RingView.swift文件中（对于上下文，RingView绘制一个环）。

这在技术上工作正常，因为我在运行应用程序时正确呈现了我的铃声。我要做的是从我的ViewController.swift文件中以编程方式设置环的线宽和笔触颜色。虽然我在构建时没有收到任何错误，但是我将lineWidth设置为10，例如，当我构建时，行的宽度始终为1。

RingView.swift

class RingView: UIView {

var lineWidth: CGFloat = 1

var strokeColor = UIColor(red: 147.0/255.0, green: 184.0/255.0, blue: 255.0/255.0, alpha: 1.0).CGColor

let circlePathLayer = CAShapeLayer()
let circleRadius: CGFloat = 105.0

override init(frame: CGRect) {
    super.init(frame: frame)
    configure()
}

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

func configure() {

    circlePathLayer.frame = bounds
    circlePathLayer.lineWidth = lineWidth
    circlePathLayer.fillColor = UIColor.clearColor().CGColor
    circlePathLayer.strokeColor = strokeColor

    layer.addSublayer(circlePathLayer)
    backgroundColor = UIColor.clearColor()
}

func circleFrame() -> CGRect {
    var circleFrame = CGRect(x: 0, y: 0, width: 2*circleRadius, height: 2*circleRadius)
    circleFrame.origin.x = CGRectGetMidX(circlePathLayer.bounds) - CGRectGetMidX(circleFrame)
    circleFrame.origin.y = CGRectGetMidY(circlePathLayer.bounds) - CGRectGetMidY(circleFrame)
    return circleFrame
}

func circlePath() -> UIBezierPath {
    return UIBezierPath(ovalInRect: circleFrame())
}

override func layoutSubviews() {
    super.layoutSubviews()
    circlePathLayer.frame = bounds
    circlePathLayer.path = circlePath().CGPath
}

}

ViewController.swift

import UIKit

class ViewController: UIViewController {

@IBOutlet var titleLabel: UILabel!

@IBOutlet weak var RingViewInner: RingView!


var detailItem: Minion? {
    didSet {
        // Update the view.
        self.configureView()
    }
}

func configureView() {

    // Update the user interface for the detail item.
    if let detail = self.detailItem {

        //Set the label for the title name
        if let label = titleLabel {
            label.text = detail.title!
        }
    }
}

override func viewDidLoad() {
    super.viewDidLoad()

    RingViewInner?.strokeColor = UIColor(red: 255.0/255.0, green: 0.0/255.0, blue: 0.0/255.0, alpha: 0.0).CGColor
    RingViewInner?.lineWidth = 10
    RingViewInner.setNeedsDisplay()

    //Show the configured context of data
    self.configureView()
}
}

任何想法都会非常感激。谢谢！

Answer 1

我将在下面的示例的帮助下解释这一点，其中我有一个简单的视图，里面有一个UIImageView，后来我想从ViewController设置它的图像。以下代码用于视图 -

class ImagePreviewView: UIView {
    var imgView: UIImageView!
    var img: UIImage!

    override init(frame: CGRect) {
        super.init(frame: frame)

        imgView=UIImageView(frame: CGRect(x: 0, y: 0, width: self.frame.width, height: self.frame.height))
        imgView.contentMode = .scaleAspectFit

        self.addSubview(imgView)
    }

    func setImage(img: UIImage){
        self.imgView.image=img
    }

    override func didMoveToSuperview() {
        self.backgroundColor=UIColor.black
    }

    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
}

现在是ViewController的代码

class ViewController: UIViewController {
    override func viewDidLoad() {
        imagePreviewView = ImagePreviewView(frame: CGRect(x: self.view.frame.width, y: 0, width: self.view.frame.width-sideStripWidth, height: self.view.frame.height-140))
        self.view.addSubview(imagePreviewView)
    }

    //call this function to set image of imagePreviewView
    func changeImage(img){
        imagePreviewView.setImage(img: img)
    }
}

changeImage函数调用imagePreviewView中的setImage函数来更改图像。希望能帮助到你。

Answer 2

你可以将变量设为全局变量，例如你可以把它放在“ViewController”类的旁边