VC中动态改变背景颜色答案

【问题标题】：Dynamically changing background color in VCVC中动态改变背景颜色
【发布时间】：2021-11-23 21:52:12
【问题描述】：

我的作业被这块卡住了。
也许有人可以解释我如何解决它。

“VC 包含一个带有内置控制器的控制器。两者都是父级和子控制器有三个按钮：绿色、黄色、紫罗兰。当您单击父控制器中的一个按钮时，子控制器的背景颜色会更改为相应的颜色。当您单击子控制器中的按钮时，父级的背景发生变化。”

这是我在代码中所做的
父 VC

import UIKit

class OrangeViewController: UIViewController, VioletControllerDelegate {
   
    

    var delegate: VioletControllerDelegate?
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
    }
    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
            let vcV = segue.destination as! VioletViewController
            vcV.bgColor = view.backgroundColor
            vcV.delegate = self
        }

    
    @IBAction func greenOButton(_ sender: Any) {
        //TO DO
    }
    
    @IBAction func yellowOButton(_ sender: Any) {
        //TO DO
    }
    
    @IBAction func purpleOButton(_ sender: Any) {
        //TO DO
    }
    
    func setColor(color: String) {
        view.backgroundColor = UIColor(named: color)
    }
}

儿童 VC

import UIKit
protocol VioletControllerDelegate{
    func setColor ( color : String)
}

class VioletViewController: UIViewController {
    var bgColor : UIColor?
   
    var delegate: VioletControllerDelegate?
    
    override func viewDidLoad() {
        super.viewDidLoad()
        var bgColor = view.backgroundColor
    }
    
    @IBAction func setGreen(_ sender: Any) {
        delegate?.setColor( color: "green")
    }
    @IBAction func setYellow(_ sender: Any) {
        delegate?.setColor( color: "yellow")
    }
    
    @IBAction func setViolet(_ sender: Any) {
        delegate?.setColor( color: "violet")
    }
    
    func setColor ( color : String){
    view.backgroundColor = UIColor(named: color)
    }
}

谢谢！

【问题讨论】：

标签： swift uiviewcontroller

【解决方案1】：

我做到了。如果有人需要这样的东西，我会发布我的答案：

父 VC

import UIKit

class OrangeViewController: UIViewController, VioletControllerDelegate {
   
   
    

    var childVC: VioletViewController?
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
    }
    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
            let vcV = segue.destination as! VioletViewController
            self.childVC = vcV
            vcV.delegate = self
        }

    
    @IBAction func greenOButton(_ sender: Any) {
        childVC?.view.backgroundColor = UIColor.green
    }
    
    @IBAction func yellowOButton(_ sender: Any) {
        childVC?.view.backgroundColor = UIColor.yellow
    }
    
    @IBAction func purpleOButton(_ sender: Any) {
        childVC?.view.backgroundColor = UIColor.purple
    }
    
    func setColor( color : UIColor) {
        view.backgroundColor = color
    }
}

儿童 VC

import UIKit
protocol VioletControllerDelegate{
    func setColor ( color : UIColor)
}

class VioletViewController: UIViewController {
    
   
    var delegate: VioletControllerDelegate?
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
    }
    
    @IBAction func setGreen(_ sender: Any) {
        delegate?.setColor( color: UIColor.green)
    }
    @IBAction func setYellow(_ sender: Any) {
        delegate?.setColor( color: UIColor.yellow)
    }
    
    @IBAction func setViolet(_ sender: Any) {
        delegate?.setColor( color: UIColor.purple)
    }
    
    
}

【讨论】：