我是编程新手，正在尝试制作应用。我现在的问题是，当我启动模拟器时，应用程序没有显示，只有黑色和顶部的电池/时间行。我已经尝试重置模拟器，清理程序，以及其他对话中的许多其他事情但没有任何效果。可能是什么问题？
我可以插入你想要的编码行。
的ViewController：
import UIKit
import GoogleSignIn
import Firebase
@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate, GIDSignInDelegate {
func sign(_ signIn: GIDSignIn!, didDisconnectWith user: GIDGoogleUser!, withError error: Error!) {
}
func sign(_ signIn: GIDSignIn!, didSignInFor user: GIDGoogleUser!, withError error: Error!) {
}
var window: UIWindow?
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions:[NSObject: AnyObject]?) -> Bool {
FIRApp.configure()
self.window = UIWindow(frame:UIScreen.main.bounds)
let mainStoryboard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
var ViewController: ViewController = mainStoryboard.instantiateViewController(withIdentifier: "ExampleController") as! ViewController
self.window?.rootViewController = ViewController
self.window?.makeKeyAndVisible()
var configureError: NSError?
GGLContext.sharedInstance().configureWithError(&configureError)
assert(configureError == nil, "Error configuring Google services: \(configureError)")
GIDSignIn.sharedInstance().clientID = "YOUR_CLIENT_ID"
GIDSignIn.sharedInstance().delegate = self
GIDSignIn.sharedInstance().clientID = FIRApp.defaultApp()?.options.clientID
// Initialize sign-in
return true
func application(_ application: UIApplication,
open url: URL, sourceApplication: String?, annotation: Any) -> Bool {
return GIDSignIn.sharedInstance().handle(url,
sourceApplication: sourceApplication,
annotation: annotation)
}
func sign(_ signIn: GIDSignIn!, didSignInFor user: GIDGoogleUser!,
withError error: Error!) {
if let error = error {
print("\(error.localizedDescription)")
// [START_EXCLUDE silent]
NotificationCenter.default.post(
name: Notification.Name(rawValue: "ToggleAuthUINotification"), object: nil, userInfo: nil)
// [END_EXCLUDE]
} else {
// Perform any operations on signed in user here.
let userId = user.userID // For client-side use only!
let idToken = user.authentication.idToken // Safe to send to the server
let fullName = user.profile.name
let givenName = user.profile.givenName
let familyName = user.profile.familyName
let email = user.profile.email
// [START_EXCLUDE]
NotificationCenter.default.post(
name: Notification.Name(rawValue: "ToggleAuthUINotification"),
object: nil,
userInfo: ["statusText": "Signed in user:\n\(fullName)"])
// [END_EXCLUDE]
}
func sign(_ signIn: GIDSignIn!, didDisconnectWith user: GIDGoogleUser!,
withError error: Error!) {
// Perform any operations when the user disconnects from app here.
// [START_EXCLUDE]
NotificationCenter.default.post(
name: Notification.Name(rawValue: "ToggleAuthUINotification"),
object: nil,
userInfo: ["statusText": "User has disconnected."])
// [END_EXCLUDE]
}
}
故事板：
import UIKit
import GoogleSignIn
import Firebase
@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate, GIDSignInDelegate {
func sign(_ signIn: GIDSignIn!, didDisconnectWith user: GIDGoogleUser!, withError error: Error!) {
}
func sign(_ signIn: GIDSignIn!, didSignInFor user: GIDGoogleUser!, withError error: Error!) {
}
var window: UIWindow?
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions:[NSObject: AnyObject]?) -> Bool {
FIRApp.configure()
return true
self.window = UIWindow(frame:UIScreen.main.bounds)
let mainStoryboard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
var ViewController: ViewController = mainStoryboard.instantiateViewController(withIdentifier: "ExampleController") as! ViewController
self.window?.rootViewController = ViewController
self.window?.makeKeyAndVisible()
return true
var configureError: NSError?
GGLContext.sharedInstance().configureWithError(&configureError)
assert(configureError == nil, "Error configuring Google services: \(configureError)")
GIDSignIn.sharedInstance().clientID = "YOUR_CLIENT_ID"
GIDSignIn.sharedInstance().delegate = self
return true
GIDSignIn.sharedInstance().clientID = FIRApp.defaultApp()?.options.clientID
// Initialize sign-in
return true
func application(_ application: UIApplication,
open url: URL, sourceApplication: String?, annotation: Any) -> Bool {
return GIDSignIn.sharedInstance().handle(url,
sourceApplication: sourceApplication,
annotation: annotation)
}
func sign(_ signIn: GIDSignIn!, didSignInFor user: GIDGoogleUser!,
withError error: Error!) {
if let error = error {
print("\(error.localizedDescription)")
// [START_EXCLUDE silent]
NotificationCenter.default.post(
name: Notification.Name(rawValue: "ToggleAuthUINotification"), object: nil, userInfo: nil)
// [END_EXCLUDE]
} else {
// Perform any operations on signed in user here.
let userId = user.userID // For client-side use only!
let idToken = user.authentication.idToken // Safe to send to the server
let fullName = user.profile.name
let givenName = user.profile.givenName
let familyName = user.profile.familyName
let email = user.profile.email
// [START_EXCLUDE]
NotificationCenter.default.post(
name: Notification.Name(rawValue: "ToggleAuthUINotification"),
object: nil,
userInfo: ["statusText": "Signed in user:\n\(fullName)"])
// [END_EXCLUDE]
}
func sign(_ signIn: GIDSignIn!, didDisconnectWith user: GIDGoogleUser!,
withError error: Error!) {
// Perform any operations when the user disconnects from app here.
// [START_EXCLUDE]
NotificationCenter.default.post(
name: Notification.Name(rawValue: "ToggleAuthUINotification"),
object: nil,
userInfo: ["statusText": "User has disconnected."])
// [END_EXCLUDE]
}
}
func applicationWillResignActive(_ application: UIApplication) {
// Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
// Use this method to pause ongoing tasks, disable timers, and invalidate graphics rendering callbacks. Games should use this method to pause the game.
}
func applicationDidEnterBackground(_ application: UIApplication) {
// Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
// If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
}
func applicationWillEnterForeground(_ application: UIApplication) {
// Called as part of the transition from the background to the active state; here you can undo many of the changes made on entering the background.
}
func applicationDidBecomeActive(_ application: UIApplication) {
// Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
}
func applicationWillTerminate(_ application: UIApplication) {
// Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
}
}}
答案 0 :(得分：0)
您的问题似乎在于AppDelegate。您的return方法中似乎有多个application:didFinishLaunchingWithOptions:语句 - 执行后不会到达第一个之后的部分。因此，将无法访问您的视图控制器实例化。只需删除除最后一个之外的所有return语句，一切都应该有效。