如何在 Swift 3 中使用 Rest API Firebase 数据？

Question

我在 firebase 中有一个数据库，我想使用这些数据，并将其保存到我的对象的变量中，但是我不明白如何执行此操作。我已阅读 Firebase 文档，但没有。

到目前为止，我只有这个

let guia = firebase.child("guias_administracao")
guia.observe(FIRDataEventType.value, with: { (snapshot) in

print(snapshot.value as Any)
for item in snapshot.children{
    let g = GuiaAdmModel(
        link: (item as! String),
        nome: (item as! String),
        videoLink: (item as! String)
    )
    self.listGuiaAdm.append(g)
}

当我运行时，这个错误返回给我

Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKit/UIView.h> may also be helpful.
Optional(<__NSArrayM 0x600000246db0>(
<null>,
{
    link = "guia_administracao/MERCK_GUIA_UTILIZACAO_DIGITAL_fertilidade_2016_09_22_Cetrotide.pdf";
    nome = Cetrotide;
    videoLink = "//player.vimeo.com/video/183506335?color=ff0179&byline=0&portrait=0";
},
{
    link = "guia_administracao/MERCK_GUIA_UTILIZACAO_DIGITAL_fertilidade_2016_09_22_Crinone.pdf";
    nome = Crinone;
    videoLink = "";
},
{
    link = "guia_administracao/MERCK_GUIA_UTILIZACAO_DIGITAL_fertilidade_2016_09_22_Gonalf.pdf";
    nome = Gonalf;
    videoLink = "";
},
{
    link = "gs://fertility-b4db3.appspot.com/guia_administracao/Ovidrel.pdf";
    nome = Ovidrel;
    videoLink = "";
}
)
)
Could not cast value of type 'FIRDataSnapshot' (0x1061f7260) to 'NSString' (0x1079fdc60).

请帮帮我 一些示例或教程会很有帮助

Answer 1

假设您的模型设置正确，以下内容应该对您有用，如果没有，请将 init 更改为接受 snap.key 作为键，并将 snap.value 作为第二个参数（作为字典）。

guia.observe(.value, with: { (snapshot) in
if let snapshot = snapshot.children.allObjects as? [FIRDataSnapshot] {
    for snap in snapshot {
        if let gDict = snap.value as ? Dictionary < String, AnyObject > {
                let g = GuiAdmModel(
                    link: gDict["link"],
                    nome: gDict["nome"],
                    videoLink: gDict["videoLink"]
                )
                self.listGuiaAdm.append(g)
        }
    }
}
})