首先,我检查了这些对我没有帮助的答案: Swift JSON错误,无法将'__NSArrayM'(0x507b58)类型的值转换为'NSDictionary'(0x507d74)
从Firebase(3.x)检索数据时,出现错误,即:
Could not cast value of type '__NSArrayM' (0x10ca9fc30) to 'NSDictionary' (0x10caa0108).
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使用此代码和树:
树:
检索功能:
func retrievePlanes() {
print("Retrieve Planes")
ref = FIRDatabase.database().reference(withPath: "results")
ref.observe(.value, with: { snapshot in
var newItems: [Planes] = []
for item in snapshot.children {
let planesItem = Planes(snapshot: item as! FIRDataSnapshot)
newItems.append(planesItem)
}
self.planes = newItems
self.tableView.reloadData()
})
}
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Planes.swift - 管理数据
import Foundation
import Firebase
import FirebaseDatabase
struct Planes {
let key: String!
let name: String!
let code:String!
let flightRange: …Run Code Online (Sandbox Code Playgroud) 我试图使用JSSAlertView(github.com/stakes/JSSAlertView)与Swift 2.0,但我有一个错误:
Cannot invoke animateWithDuration with an argument list of type '(Double, delay: Double, usingSpringWithDampling: Double, initialSpringVelocity: Double, options: nil, animations () -> _, completion: (Bool) -> _)'
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代码:
UIView.animateWithDuration(0.5, delay: 0.05, usingSpringWithDamping: 0.8, initialSpringVelocity: 0.5, options: nil, animations: {
self.containerView.center = self.rootViewController.view.center
}, completion: { (finished: Bool) in
})
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我看到了这两个答案: 嵌套的闭包不喜欢参数列表 UIView动画在Swift中不起作用,错误的参数错误 但它们对我没有帮助.
我仍然认为问题来自"动画"或"完成".
我正在尝试为 NSXPCInterface 构建一个协议,但遇到了一个奇怪的问题。
我创建了一个协议:
public protocol AProtocol {
//functions in here
}
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当我想将其添加到 NSXPCConnection 的导出接口时,
let newConnection: NSXPCConnection
newConnection.exportedInterface = NSXPCInterface(with: AProtocol.self)
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我收到这个奇怪的错误:
Cannot convert value of type 'AProtocol.Protocol' to expected argument type 'Protocol'
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