ios Appdelegate中的全局变量迅速
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Global variable in Appdelegate in swift
提问by Saurabh Mishra
I am saving some data to a variable of appdelegate from a viewcontroller & fetching it from another view controller.Below is the code of app delegate
我正在将一些数据从视图控制器保存到 appdelegate 变量并从另一个视图控制器获取它。下面是应用程序委托的代码
class AppDelegate: UIResponder, UIApplicationDelegate {
var window: UIWindow?
var navigationController: UINavigationController?
var mainDic:NSMutableDictionary?
Code to set the mainDic
设置 mainDic 的代码
func filterResponse(response:NSDictionary){
var appDelegate=AppDelegate()
appDelegate.mainDic=response.mutableCopy() as? NSMutableDictionary
}
Code to fetch the dictionary.
获取字典的代码。
let appDelegate = UIApplication.sharedApplication().delegate as! AppDelegate
println(appDelegate.mainDic)
The issue is I am getting the output nil.Please make me correct.
问题是我得到的输出为零。请纠正我。
回答by Leo
This is your error
这是你的错误
var appDelegate=AppDelegate() //You create a new instance, not get the exist one
You need to access the exiting AppDelegate
您需要访问现有的 AppDelegate
let appDelegate = UIApplication.shared.delegate as! AppDelegate
回答by Sankalap Yaduraj Singh
Swift 4.0
斯威夫特 4.0
let appDelegate = UIApplication.shared.delegate as! AppDelegate
let aVariable = appDelegate.value
Swift 3.0
斯威夫特 3.0
let appDelegate = UIApplication.shared.delegate as! AppDelegate
let aVariable = appDelegate.someVariable
Swift 2.0
斯威夫特 2.0
let appDelegate = UIApplication.sharedApplication().delegate as! AppDelegate
let aVariable = appDelegate.someVariable
回答by tania_S
func appDelegate() -> AppDelegate {
return UIApplication.sharedApplication().delegate as! AppDelegate
}
