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当我们在swift中从当前的ViewController转到上一个ViewController时,调用哪个方法

delegates swift ios

Wings · 技术社区 · 7 年前

我有一个问题,我在一个应用程序,我提出了一个问题 ViewController(FilterVC) 从我以前的 ViewController(ItemsVC) . 我将过滤器数据存储在委托方法中,如下所示

protocol FilterVCDelegate: class {
func didSelectedFilters(_ sender: FilterVC, with selectedFilters: [String:Any])
}

一按按钮,我就成功地把数据传给了我以前的 ItemVC

@IBAction func applyButtonAction(_ sender: UIButton) {
    printD(selectedFilters)
    self.delegate?.didSelectedFilters(self, with: self.selectedFilters)
    self.dismiss(animated: true, completion: nil)
}

项目VC:-

func didSelectedFilters(_ sender: FilterVC, with selectedFilters: [String : Any]) {
    self.currentFilters = selectedFilters
    printD("selectedFilters \(currentFilters)") // successfully get data from previous vc
}

下面是调用api方法:-

func searchFromLatestRelease() {

  //  let param: [String:Any] = ["page": pageNo, "search_term": forSearch, "order_by": "date", "token": commonClass.sharedInstance.userToken ?? ""]

    let param: [String:Any] = ["price_range": currentFilters["price"] as? [String] as Any, "page": "0", "is_rating": currentFilters["Product Rating"] as? [String] as Any]
    printD("param: \(param)")
    Alamofire.request(Constants.API.url("search"), method: .post, parameters: param, encoding: URLEncoding.httpBody, headers: nil).responseJSON {
        (response:DataResponse<Any>) in

        guard let json = response.result.value as? [String:Any] else {return}
        printD(json)

        guard let status = json["status"] as? Int else {return}
        printD(status)

        if status == 1 {

            if self.pageNo == 0 { self.sneakers = [] }
            guard let data = json["data"] as? [[String:Any]] else { return}

            printD(data)
            for dic in data {
                self.sneakers.append(sneakerModel(response: dic))
            }

            self.reloadData()

        }
        else {
            commonClass.sharedInstance.showErrorMessage(json["msg"] as? String ?? "Server error. Please try again later.")
        }
    }
}

但如果叫它进来就不行了 ViewWillAppear ViewDidLoad . 现在我需要使用这些文件管理器作为参数来调用 . 刷新数据并成功显示 ItemsVC . 有8个 ViewControllers 项目VC

在控制台中,我得到的currenFilter如下:-

selectedFilters ["Product Rating": ["5", "4", "3", "2", "1"], "Price": ["$00.00 - $200.00", "$200.00 - $400.00", "$600.00 - $800.00", "$800.00 - $1000.00", "$1000.00 AND OVER"]]

(有限责任公司)

1 回复 | 直到 7 年前

Shehata Gamal 7 年前

viewDidLoad 在vc初始化时调用一次, ViewWillAppear / viewDidAppear 在模型解散后调用,您需要

func didSelectedFilters(_ selectedFilters: [String : Any]) {
    self.currentFilters = selectedFilters
    self.searchFromLatestRelease()
}