I need to pass a variable from the AppDelegate to another class that I have created to hold global variables of the project and I'm not able to find a way to make it work.
我需要将一个变量从AppDelegate传递给另一个我创建来保存项目全局变量的类,我无法找到使它工作的方法。
This is the code in the AppDelegate:
这是AppDelegate中的代码:
func application(application: UIApplication!, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: NSData!) {
println("Device's token is: \(deviceToken)")
//Global Variables Class Instance
let globals:Globals = Globals()
globals.setDeviceToken("test1") //method1 not working
globals.deviceToken = "test2" //method2 not working
}
This is my Globals Class:
这是我的环球课程:
public class Globals {
var deviceToken = String()
init() {
//nothing
}
func setDeviceToken(s:String){
deviceToken = s
}
func getDeviceToken() -> String {
return deviceToken
}
}
If i try to print the value, from other files of the project, I'm not able to get anything, just an empty string.
如果我试图从项目的其他文件中打印值,我就不能得到任何东西,只是一个空字符串。
class ViewController: UIViewController {
//Global Variables Class Instance
let globals:Globals = Globals()
override func viewDidLoad() {
println(globals.getDeviceToken()) //return empty string
println(globals.deviceToken) //return empty string
***UPDATE: To those who voted down my question: Thank you very much. Sorry if I'm not an expert of Swift (yet) and sorry if I'm using * to ask something I don't know!
***更新:对于那些投票否决我的问题的人:非常感谢。对不起,如果我还不是Swift的专家,如果我用*来询问我不知道的事情,我很抱歉!
2 个解决方案
#1
14
There are several patterns you can use to achieve what you want
有几种模式可以用来实现您想要的
-
You could access the AppDelegate through the UIApplication:
你可以通过UIApplication访问AppDelegate:
let delegate = UIApplication.sharedApplication().delegate as AppDelegate let deviceToken = delegate.deviceToken
-
Look into singletons. A quick google search for 'Swift singleton' will get you a long way. The first result:
单例。快速搜索谷歌中的“快速单例”会让你有很长的路要走。第一个结果:
class SingletonB { class var sharedInstance : SingletonB { struct Static { static let instance : SingletonB = SingletonB() } return Static.instance } }
Then use sharedInstance
to instantiate the singleton anywhere and access the same variables.
然后使用sharedInstance实例化singleton,并访问相同的变量。
The first one is quick and dirty, so for more serious projects I would recommend the singleton pattern.
第一个是快速和脏的,因此对于更严肃的项目,我将推荐单例模式。
There are probably a million ways to do this, but this should get you started
可能有上百万种方法可以做到这一点,但是这应该能让你开始
(More at this link, which explores a few ways to implement singletons: https://github.com/hpique/SwiftSingleton )
(更多信息请参见这个链接,它探讨了实现单例的几种方法:https://github.com/hpique/SwiftSingleton)
#2
5
I simply solved my problem using NSUserDefaults
我只是用NSUserDefaults来解决我的问题
in the AppDelegate:
在AppDelegate:
NSUserDefaults.standardUserDefaults().setObject(deviceToken, forKey: "deviceToken")
NSUserDefaults.standardUserDefaults().synchronize()
From other classes:
其他类:
NSUserDefaults.standardUserDefaults().objectForKey("deviceToken")
Honestly I don't know if this is a good way to do it but it's working
老实说,我不知道这是不是一个好方法,但它确实有效
***UPDATE: To those who voted down my question: Thank you very much. Sorry if I'm not an expert of Swift (yet) and sorry if I'm using * to ask something I don't know!
***更新:对于那些投票否决我的问题的人:非常感谢。对不起,如果我还不是Swift的专家,如果我用*来询问我不知道的事情,我很抱歉!
#1
14
There are several patterns you can use to achieve what you want
有几种模式可以用来实现您想要的
-
You could access the AppDelegate through the UIApplication:
你可以通过UIApplication访问AppDelegate:
let delegate = UIApplication.sharedApplication().delegate as AppDelegate let deviceToken = delegate.deviceToken
-
Look into singletons. A quick google search for 'Swift singleton' will get you a long way. The first result:
单例。快速搜索谷歌中的“快速单例”会让你有很长的路要走。第一个结果:
class SingletonB { class var sharedInstance : SingletonB { struct Static { static let instance : SingletonB = SingletonB() } return Static.instance } }
Then use sharedInstance
to instantiate the singleton anywhere and access the same variables.
然后使用sharedInstance实例化singleton,并访问相同的变量。
The first one is quick and dirty, so for more serious projects I would recommend the singleton pattern.
第一个是快速和脏的,因此对于更严肃的项目,我将推荐单例模式。
There are probably a million ways to do this, but this should get you started
可能有上百万种方法可以做到这一点,但是这应该能让你开始
(More at this link, which explores a few ways to implement singletons: https://github.com/hpique/SwiftSingleton )
(更多信息请参见这个链接,它探讨了实现单例的几种方法:https://github.com/hpique/SwiftSingleton)
#2
5
I simply solved my problem using NSUserDefaults
我只是用NSUserDefaults来解决我的问题
in the AppDelegate:
在AppDelegate:
NSUserDefaults.standardUserDefaults().setObject(deviceToken, forKey: "deviceToken")
NSUserDefaults.standardUserDefaults().synchronize()
From other classes:
其他类:
NSUserDefaults.standardUserDefaults().objectForKey("deviceToken")
Honestly I don't know if this is a good way to do it but it's working
老实说,我不知道这是不是一个好方法,但它确实有效
***UPDATE: To those who voted down my question: Thank you very much. Sorry if I'm not an expert of Swift (yet) and sorry if I'm using * to ask something I don't know!
***更新:对于那些投票否决我的问题的人:非常感谢。对不起,如果我还不是Swift的专家,如果我用*来询问我不知道的事情,我很抱歉!