Question

我对Swift和程序设计非常陌生，请耐心等待：

我创建了一个NSObject来访问多个文本和按钮。

import UIKit

class WelcomeScreen: NSObject {

var messageText: String?
var imageName: String?
var buttonName: UIButton?

static func sampleScreens() -> [WelcomeScreen] {

    let splitButton: UIButton = {
        let button = UIButton(type: .system)
        button.setTitle("Split", for: .normal)
        button.setTitleColor(.black, for: .normal)
        button.titleLabel?.font = UIFont(name: "IBMPlexSans", size: 25)
        button.translatesAutoresizingMaskIntoConstraints = false
        button.backgroundColor = UIColor(red: 241/255, green: 249/255, blue: 254/255, alpha: 1.0) /* #f1f9fe */
        button.layer.cornerRadius = 33
        button.layer.borderWidth = 1
        button.layer.borderColor = UIColor.black.cgColor
        button.tag = 0
        return button
    }()

    let playButton: UIButton = {
        let button = UIButton(type: .system)
        button.setTitle("Play", for: .normal)
        button.setTitleColor(.black, for: .normal)
        button.titleLabel?.font = UIFont(name: "IBMPlexSans", size: 25)
        button.translatesAutoresizingMaskIntoConstraints = false
        button.backgroundColor = UIColor(red: 241/255, green: 249/255, blue: 254/255, alpha: 1.0) /* #f1f9fe */
        button.layer.cornerRadius = 33
        button.layer.borderWidth = 1
        button.layer.borderColor = UIColor.black.cgColor
        button.tag = 1

        return button
    }()

    let splitScreen = WelcomeScreen()
    splitScreen.messageText = "It's simple, start splitting your bill"
    splitScreen.imageName = "SplitButton"
    splitScreen.buttonName = splitButton



    let otherScreen = WelcomeScreen()
    otherScreen.messageText = "Choose a random party member to pay for the whole meal"
    otherScreen.imageName = "PlayButton"
    otherScreen.buttonName = playButton

    return [splitScreen, otherScreen]
}

}

在这里，我可以访问文本和图像，但无法访问按钮。

class ButtonCell: UICollectionViewCell {
var button: WelcomeScreen? {
    didSet {
        if let text = button?.messageText {
            descriptionText.text = text
        }
        if let imageName = button?.imageName{
            splitButtonView.image = UIImage(named: imageName)
        }
        splitButton = button?.buttonName
    }
}
override init(frame: CGRect) {
    super.init(frame: frame)
    setUpView()

}

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

let splitButtonView: UIImageView = {
    let imageView = UIImageView(image: #imageLiteral(resourceName: "SplitButton"))

    //enables autolayout for our imageView
    imageView.translatesAutoresizingMaskIntoConstraints = false
    imageView.contentMode = .scaleAspectFit

    return imageView
}()


var splitButton: UIButton = {
    let button = UIButton(type: .system)
    button.setTitle("Split", for: .normal)
    button.setTitleColor(.black, for: .normal)
    button.titleLabel?.font = UIFont(name: "IBMPlexSans", size: 25)
    button.translatesAutoresizingMaskIntoConstraints = false
    button.backgroundColor = UIColor(red: 241/255, green: 249/255, blue: 254/255, alpha: 1.0) /* #f1f9fe */
    button.layer.cornerRadius = 33
    button.layer.borderWidth = 1
    button.layer.borderColor = UIColor.black.cgColor

    return button

}()
let playButton: UIButton = {
    let button = UIButton(type: .system)
    button.setTitle("Play", for: .normal)
    button.setTitleColor(.black, for: .normal)
    button.titleLabel?.font = UIFont(name: "IBMPlexSans", size: 25)
    button.translatesAutoresizingMaskIntoConstraints = false
    button.backgroundColor = UIColor(red: 241/255, green: 249/255, blue: 254/255, alpha: 1.0) /* #f1f9fe */
    button.layer.cornerRadius = 33
    button.layer.borderWidth = 1
    button.layer.borderColor = UIColor.black.cgColor

    return button
}()

private let descriptionText: UILabel = {

    let textLabel = UILabel()

    textLabel.text = "It's simple, start splitting your app"
    textLabel.font = UIFont(name: "IBMPlexSans-Light", size: 20)
    textLabel.translatesAutoresizingMaskIntoConstraints = false
    textLabel.textAlignment = .center
    textLabel.backgroundColor = .clear
    textLabel.textColor = UIColor.gray
    textLabel.lineBreakMode = .byWordWrapping
    textLabel.numberOfLines = 2


    return textLabel
}()
func setUpView(){
    backgroundColor = UIColor.clear


    addSubview(descriptionText)
    addSubview(splitButtonView)
    addSubview(splitButton)



    addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "H:|-30-[v0]-30-|", options: NSLayoutConstraint.FormatOptions(), metrics: nil, views: ["v0": descriptionText]))
    addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "H:|-30-[v0]-30-|", options: NSLayoutConstraint.FormatOptions(), metrics: nil, views: ["v0": splitButton]))
    addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "V:|-50-[v1(==70)][v0(==70)]-40-|", options: NSLayoutConstraint.FormatOptions(), metrics: nil, views: ["v0": splitButton, "v1": descriptionText]))

}  
}

我的程序有多个单元格，不同的文本和图像出现在不同的单元格上。我试图弄清楚如何在不同的单元格上显示我的按钮。以下是屏幕截图：

First Page Second Page

我希望我说清楚了。任何帮助将非常感激。谢谢！

P.S。这些代码大部分来自YouTube上的各种快速教程。

Answer 1

我认为创建自定义集合视图单元比创建自定义对象会更好，更容易。在为Swift开发ios的所有时间里，我只需要在处理目标c时从NSObject实例化。

如何从NSObject访问多个按钮？

1 个答案: