我怎样才能获得的功能阵列中迅速？

Question

我在迅速新。我有使在笔尖文件的CollectionView和我的是，在主视图控制器一个子视图。我想表现出的CollectionView数组，但我不能。首先是让天的模型：

struct Days {    
    let day: String
    let Image: String
    let temp: Double
}

然后在daycell：

class DayCell: UICollectionViewCell {
    @IBOutlet weak var lblDay: UILabel!
    @IBOutlet weak var imgWeather: KBImageView!
    @IBOutlet weak var lblTemp: UILabel!    
    func updateViews(day: Days) {
        lblDay.text = day.day
        imgWeather.setImageWithKingFisher(url: day.Image)
        lblTemp.text = String(day.temp)
    }
}

那么在公共类，我得到alamofire JSON数据与译码，并把它们在我的模型：

public class Publics {
    static let instance = Publics()  

func showInfo(code: String, completion: @escaping ([Days]) -> Void)  {


    let DaysUrl = "http://api.openweathermap.org/data/2.5/forecast?id=\(code)&appid=3e28385cde03f6ee26c83b629ca274cc"
       Alamofire.request(DaysUrl, method: .get, parameters: nil, encoding: URLEncoding.httpBody).responseJSON { response in
            if let data = response.data {
                do {
                    self.myJson = try JSONDecoder().decode(JsonForecast.Response.self, from: data)                   

                    let counter = (self.myJson?.list.count)! - 1

                    let myDay1 = self.myJson?.list[counter-32]
                    let myDay2 = self.myJson?.list[counter-24]
                    let myDay3 = self.myJson?.list[counter-16]                   

                    let weekDay1 = self.getDate(date: self.getDayOfWeek((myDay1?.dt_txt)!)!)
                    let weekDay2 = self.getDate(date: self.getDayOfWeek((myDay2?.dt_txt)!)!)
                    let weekDay3 = self.getDate(date: self.getDayOfWeek((myDay3?.dt_txt)!)!)

                   let DaysArray = [
                        Days(day: weekDay1, Image: (myDay1?.weather[0].icon)!, temp: (myDay1?.main?.temp)!) ,
                        Days(day: weekDay2, Image: (myDay2?.weather[0].icon)!, temp: (myDay2?.main?.temp)!) ,
                        Days(day: weekDay3, Image: (myDay3?.weather[0].icon)!, temp: (myDay3?.main?.temp)!)
                    ]
                    completion(DaysArray)
                } catch {
                    print(error)
                }
            }
        }
    }

到这里我没有问题，但现在我想显示的CollectionView DaysArray，但我不能和我的CollectionView类如下：

class DayCollection: UIView, UICollectionViewDelegate, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout {

    @IBOutlet var contentView: UIView!
    @IBOutlet weak var collectionDay: UICollectionView!
    var days = [Days]()


    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {

        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "DayCell", for: indexPath) as! DayCell

        Publics.instance.showInfo(code: "112931") { result in
            self.days = result
            print(self.days)
            DispatchQueue.main.async {
                self.collectionDay.reloadData()
            }
        }
        let day = days[indexPath.item]
        cell.updateViews(day: day)

            return cell

    }

    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return days.count
    }

    override func awakeFromNib() {
        super.awakeFromNib()

        self.collectionDay.dataSource = self
        self.collectionDay.delegate = self
        self.collectionDay.register(UINib(nibName: "DayCell", bundle: nil), forCellWithReuseIdentifier: "DayCell")

    }
}

我应该在mainVC类呢？ （也许我应该i。从协议委托或没有使用？）

Answer 1

如果你想拥有首先在一个结构常数声明为常数。 private(set)是可怕的。

struct Days {    
    let day: String
    let dImage: String
    let temp: Double 
}

而永远宣告结构成员作为与非可选值在init方法初始化隐含展开自选。反正不需要在结构中的init方法。

---

您必须添加一个完成处理程序

public func showInfo(code: String, completion: @escaping ([Days]) -> Void)  {

...

let daysArray = [
   Days(day: weekDay1, Image: (myDay1?.weather[0].icon)!, temp: (myDay1?.main?.temp)!) ,
   Days(day: weekDay2, Image: (myDay2?.weather[0].icon)!, temp: (myDay2?.main?.temp)!) ,
   Days(day: weekDay3, Image: (myDay3?.weather[0].icon)!, temp: (myDay3?.main?.temp)!)
]
completion(daysArray)
}

然后在类的集合视图的添加数据源阵列

var days = [Days]() 

并获得数据

Publics.instance.showInfo(code: "Foo") { result in
   self.days = result
   DispatchQueue.main.async {
       self.collectionDay.reloadData()
    }
}

和return days.count在numberOfItemsInSection

另外力展开细胞

let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "DayCell", for: indexPath) as! DayCell

如果代码崩溃，你做了一个设计错误。通过可选的绑定代码不会崩溃，但你看不到任何东西，你不知道为什么

并获得了一天

let day = days[indexPath.item]
cell.updateViews(day)