我一直试图将变量从一个视图传递到另一个视图。我故意在没有故事板的情况下以编程方式执行此操作。
ViewController created有一个UIButton,按下时调用AuthoriseController。
然后,AuthoriseController加载一个UIWebView,在特定的URL上打开它,例如https://foursquare.com/oauth2/authenticate?client_id=xxxxx&response_type=token&redirect_uri=yyyyy
这会加载OAuth屏幕。用户登录后,控制权返回给AuthoriseController,我在其中提取重定向URI中返回的access_token。
exctraction工作得很好,我可以抓住令牌,我的问题是我想把令牌送回我的ViewController,这样当用户再次按下按钮时,它将可用于HTTP请求(在我刚刚打印令牌的那一刻。)
我的ViewController和AuthoriseController实现了一个名为DataProtocol的协议,我希望可以在协议之间共享令牌。
的ViewController:
import UIKit
class ViewController: UIViewController {
var delegate: DataProtocol? = nil
func setUpView(){
let firstView = UIView()
let button = UIButton.buttonWithType(UIButtonType.System) as UIButton
firstView.setTranslatesAutoresizingMaskIntoConstraints(false)
firstView.backgroundColor = UIColor(red: 0.75, green: 0.75, blue: 0.1, alpha: 1.0)
view.addSubview(firstView)
setUpButton(button)
firstView.addSubview(button)
setUpConstraints(firstView, button)
}
func setUpConstraints(firstView: UIView, _ button: UIButton) {
let viewsDictionary = ["firstView":firstView,"button":button]
let metricsDictionary = ["firstViewHeight":1334.0,"viewWidth":750.0 ]
let firstViewHeightConstraintH:NSArray = NSLayoutConstraint.constraintsWithVisualFormat("H:[firstView(viewWidth)]", options: NSLayoutFormatOptions(0), metrics: metricsDictionary, views: viewsDictionary)
let firstViewHeightConstraintV:NSArray = NSLayoutConstraint.constraintsWithVisualFormat("V:[firstView(firstViewHeight)]", options: NSLayoutFormatOptions(0), metrics: metricsDictionary, views: viewsDictionary)
firstView.addConstraints(firstViewHeightConstraintH)
firstView.addConstraints(firstViewHeightConstraintV)
let buttonConstraintH:NSArray = NSLayoutConstraint.constraintsWithVisualFormat("H:|-150-[button(>=80)]", options: NSLayoutFormatOptions.AlignAllCenterY, metrics: nil, views: viewsDictionary)
let buttonConstraintV:NSArray = NSLayoutConstraint.constraintsWithVisualFormat("V:|-300-[button]", options: NSLayoutFormatOptions(0), metrics: nil, views: viewsDictionary)
firstView.addConstraints(buttonConstraintH)
firstView.addConstraints(buttonConstraintV)
}
func setUpButton(button: UIButton) {
button.setTranslatesAutoresizingMaskIntoConstraints(false)
button.setTitle("Authorise", forState: UIControlState.Normal)
button.addTarget(self, action: "buttonPressed", forControlEvents: UIControlEvents.TouchUpInside)
button.backgroundColor = UIColor.blueColor()
button.setTitleColor(UIColor.whiteColor(), forState: UIControlState.Normal)
}
override func shouldAutorotate() -> Bool {
return false
}
func buttonPressed(){
let ac = AuthoriseController()
self.presentViewController(ac, animated: true, completion: nil)
println("token in ViewController.buttonPressed: [\(self.delegate?.token)]")
}
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = UIColor(red: 0.9, green: 0.9, blue: 1, alpha: 1.0)
setUpView()
}
override func supportedInterfaceOrientations() -> Int {
return Int(UIInterfaceOrientationMask.All.toRaw())
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
}
AuthoriseController:
import UIKit
import WebKit
class AuthoriseController: UIViewController, UIWebViewDelegate, DataProtocol {
var token: String = ""
let AUTH_URL = "https://foursquare.com/oauth2/authenticate?client_id=";
let RESP_TYPE_AND_KEY_AND_TOKEN = "&response_type=token&redirect_uri=";
let REDIRECT_URI : String = "ZZZZZZZZ";
let CLIENT_ID : String = "XXXXXXX";
var webview: UIWebView = UIWebView()
override func viewDidLoad() {
super.viewDidLoad()
var myViewController = ViewController()
self.webview.frame = self.view.bounds
self.webview.delegate = self
self.view.addSubview(self.webview)
var url: NSURL = NSURL.URLWithString(AUTH_URL + CLIENT_ID + RESP_TYPE_AND_KEY_AND_TOKEN + REDIRECT_URI)
var urlRequest: NSURLRequest = NSURLRequest(URL: url)
self.webview.loadRequest(urlRequest)
}
func webView(webView: UIWebView!, shouldStartLoadWithRequest request: NSURLRequest!, navigationType: UIWebViewNavigationType) -> Bool {
token = getToken(request.URL.absoluteString!)
println("token in AuthoriseController.webView: [\(token)]")
if(!token.isEmpty) {
self.dismissViewControllerAnimated(true, completion: nil)
}
return true
}
func getToken(url: String) -> String {
var token = ""
if url.rangeOfString("#access_token") != nil{
token = url.componentsSeparatedByString("=").last!
}
return token
}
}
以下是DataProtocol:
import Foundation
protocol DataProtocol {
var token : String { get set }
}
当我这样做时:
输出:我得到了这个输出:
token in ViewController.buttonPressed: [nil]
token in AuthoriseController.webView: []
token in AuthoriseController.webView: []
token in AuthoriseController.webView: []
token in AuthoriseController.webView: [VSKRNHJRS3NWPN3EEIYMCSZYJ2YMNSH4GBXNQFL1EMYLJ5TO]
token in ViewController.buttonPressed: [nil]
token in AuthoriseController.webView: []
token in AuthoriseController.webView: [VSKRNHJRS3NWPN3EEIYMCSZYJ2YMNSH4GBXNQFL1EMYLJ5TO]
我希望在第二次出现的ViewController.buttonPressed中看到令牌,而不是NIL。
谁能看到我哪里出错了?任何帮助是极大的赞赏!史蒂夫
答案 0 :(得分:0)
看起来委托已正确连接,但您没有将令牌发送给它。在AuthoriseController中,您需要为委托设置令牌:
func webView(webView: UIWebView!, shouldStartLoadWithRequest request: NSURLRequest!, navigationType: UIWebViewNavigationType) -> Bool {
token = getToken(request.URL.absoluteString!) // sets the token in the AuthoriseController
println("token in AuthoriseController.webView: [\(token)]")
if(!token.isEmpty) {
// pass the token to the delegate
self.delegate?.token = token
self.dismissViewControllerAnimated(true, completion: nil)
}
return true
}