问题描述
请帮忙。我正在努力实现的目标 是当我点击特定的 collectionViewCell 时,ReportDetailsMapController 被推送,我的报告[indexPath.item] 从 MainController 发送到 ReportDetailsMapController。
协议:
protocol MainControllerDelegate: class {
func sendReport(data: ReportModel)
}
第一个风投:
class MainController: UIViewController,UICollectionViewDelegate,UICollectionViewDataSource,UICollectionViewDelegateFlowLayout {
var delegate: MainControllerDelegate?
override func viewDidLoad() {
super.viewDidLoad()
}
func collectionView(_ collectionView: UICollectionView,didSelectItemAt indexPath: IndexPath) {
let report = reports[indexPath.item]
//When I print(report.name) here. Everything executes correctly
self.delegate?.sendReport(data: report)
self.navigationController?.pushViewController(ReportDetailsMapController(),animated: true)
}
}
第二个VC:
class ReportDetailsMapController: UIViewController,MainControllerDelegate {
override func viewDidLoad() {
super.viewDidLoad()
let mc = MainController()
mc.delegate = self
}
func sendReport(data: ReportModel) {
print(data.name)//This does not execute when ReportDetailsMapController is loaded.
print("Report sent")
}
}
报告模型:
class ReportModel: NSObject {
var name: String?
var surname: String?
var cellNumber: String?
}
解决方法
未调用该方法,因为您没有将要推送的视图控制器分配给 delegate
属性。
当单元格被选中时,您可以按以下顺序进行:初始化视图控制器并将其分配给委托,然后调用委托方法并推送该视图控制器:
func collectionView(_ collectionView: UICollectionView,didSelectItemAt indexPath: IndexPath) {
let report = reports[indexPath.item]
//When I print(report.name) here. Everything executes correctly
let viewController = ReportDetailsMapController()
self.delegate = viewController
self.delegate?.sendReport(data: report)
self.navigationController?.pushViewController(viewController,animated: true)
}
但是,我认为更简单、更优雅的方法是简单地在 ReportDetailsMapController
上创建该属性并在推送它之前注入它。
这里有一个与此相关的类似问题/答案:passing data from tableview to viewContoller in swift