ios - 当进入预览 View Controller 时，contanerview 颜色不会改变

Question

当我转到第二个 View 并关闭并进入第一个 View Controller 然后协议(protocol)正常工作时，我有两个 View Controller ，我已经在前一个 Controller 中获得了数据，但没有一个 Controller 标题充电器或不更改 UIview 的背景颜色。

我已经设置了这种类型的方法，但背景颜色或按钮标题仍然没有改变。

这不是完整的代码，而是用于理解的示例。

    //FirstViewcontroller
class First : UIViewController, passData {

    func test(test: ApiData) {
        self.view.setNeedsDisplay()
        self.containerView.backgroundColor = .red
    }

    // Present secondviewcotroller from this viewcontroller
}

//SecondViewcontroller
protocol passData{
    func test(test : ApiData)
}

class Second : UIViewController {

    //Dismisss seconviewcontrolller
    self.dismiss(animated: true) {
        self.delegateSelectMusic.audioData = tempData
    }
}

我在关闭时已经获得了数据，但未在我的标签和按钮中设置。

Answer 1

按照这个。

//第一个 View Controller

    // container view object 

    private var recommendationsFilterFilterVC: RecommendationsFilterViewController!

// MARK: - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    // Get the new view controller using segue.destination.
    // Pass the selected object to the new view controller.

    switch segue.identifier! {
    case "RecommendationsFilterViewController":

        self.recommendationsFilterFilterVC  = (segue.destination as! RecommendationsFilterViewController)
        self.recommendationsFilterFilterVC.delegate = self

    default:
        break
    }
}


// Call Delegate Method

//MARK: UICropProfileFilterView Delegate

extension ShowRecommendationsViewController : RecommendationsFilterDelegate {
    func hideAndShowRecommendationsFilterView(arrRecommendationFilter: [JSON]) {
        viewTranslate.isHidden = true
        containerFilterView.isHidden = true
        self.arrRecommendationList .removeAll()
        self.arrRecommendationList = arrRecommendationFilter
        self.tblRecommedationList.reloadData()
    }

 }

//第二个 View Controller

protocol RecommendationsFilterDelegate: class {
    func hideAndShowRecommendationsFilterView(arrRecommendationFilter:[JSON])
}

//MARK:变量

weak var delegate: RecommendationsFilterDelegate?


@IBAction func onBack(_ sender: Any) {
    self.delegate?.hideAndShowRecommendationsFilterView(arrRecommendationFilter: object["data"]["recordDetails"].arrayValue)
}