I have this code that show a message "Msg Background" when the application is in Background. What I need is that as long as the application continues in the background show that message every 2 minutes (just an example of time). So far the code I have shows the message only once, apparently this sentence is not working properly.
UIApplication.shared.setMinimumBackgroundFetchInterval (UIApplication.backgroundFetchIntervalMinimum)
I also have this warning: 'setMinimumBackgroundFetchInterval' was deprecated in iOS 13.0: Use a BGAppRefreshTask in the BackgroundTasks framework instead
I am using swift 5 and Xcode 11
class AppDelegate: UIResponder, UIApplicationDelegate {
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
// Override point for customization after application launch.
GMSServices.provideAPIKey("AIzaSyBSpAt5zqvbh73FmG_Kb6xpiFMkWRmHppg")
UIApplication.shared.setMinimumBackgroundFetchInterval(UIApplication.backgroundFetchIntervalMinimum)
return true
}
func application(_ application: UIApplication, performFetchWithCompletionHandler completionHandler: #escaping (UIBackgroundFetchResult) -> Void) {
print("Msg Background")
}
}
As Paulw11 said, it's not called in fixed interval. The OS controls when it is going to be executed. We cannot expect the specific time because of it.
You probably know this, but I'm going to add this bit just in case, setMinimumBackgroundFetchInterval has deprecated on iOS 13 and later. You might want to consider to use BackgroundTasks Framework instead.
but if you want to test performFetchWithCompletionHandler, you can use XCode Navigation Bar > Debug > perform Background Fetch.
screenshot of XCode navigation bar to find option
I hope it can help!
Related
iOS Extension - Fatal Exception: com.firebase.core Default app has already been configured.
enter image description here
From the message it is clear that FIRApp's configure function is called twice by your app. It is supposed to call once. The best place to call it, is in the func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool in your AppDelegate.
In order to identify from where it is being called you can use 2 approaches.
Press CMD + Shift + F and search for configure keyword and identify from the results.
Add a symbolic break point and app will pause when configure function get called. See the screenshots below:
I want to call an action which will get called every time any app start.
Example:
Showing a modal with app name saying Welcome to Twitter.
you can add that action in this method of app delegate
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
perfornAction()
return true
}
There are 2 methods in which you can write your code.
applicationWillEnterForeground: Gets called when you app comes into picture after INACTIVE or TERMINATED state
didFinishLaunchingWithOptions: Gets called when app gets called for first time. Also this method will get called when app is in terminated state and you open the app.
So if you want to perform it every time when app opens, prefer applicationWillEnterForeground. And for first time user call same method in didFinishLaunchingWithOptions with some flag value(Set it to true when your code runs successfully) so that your method will not get called twice.
A couple of strange errors appeared in my code after I made a duplicate of the folder, I deleted the duplicate but I have some errors remaining..
Thread 1 SIGABRT error when running, build completes but doesn't load.
error is on the line with class AppDelegate
import UIKit
#UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
var window: UIWindow?
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
// Override point for customization after application launch.
return true
}
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:.
}
The other error lies in the image.
thanks for the help.
When you delete a file from Xcode, you should choose "Move to Trash".You can just add it to Xcode again, and delete it use "Move to Trash".
Go to the "Breakpoint navigator", click the "+" button at bottom, the choose the "Exception Breakpoint...". When the crash happen again, Xcode should stop at your exception code.
there is an Unreferred Outlet in your ViewController , Right click on your start ViewController and make sure there is no exclamation point in front of Outlets
Go to Build Phases -> Compile Sources, and see whether the app has two "ViewController.swift" files. If yes delete the one which you don't want.
Hope this helps you!
I had updated my Xcode 7.3 to Xcode 8.
It is showing multiple warnings in AppDelegate. The warning is as follows.
Extraneous '_' in parameter: 'application' has no keyword argument name
My AppDelagate.swift file is this:
import UIKit
#UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
var window: UIWindow?
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
// Override point for customization after application launch.
return true
}
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:.
}
}
when I followed the Xcode suggestion to remove _ in the functions that shows warning.
I got rid of the above warning. But now I get a new warning for
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
// Override point for customization after application launch.
return true
}
The warning is:
Non-#objc method 'application(_:didFinishLaunchingWithOptions:)' cannot satisfy optional requirement of #objc protocol 'UIApplicationDelegate'
I followed the solutions online. But had no luck in getting rid of this warning.
Any help would be appreciated.
Thanks.
Your code is correct for Swift 3. But the environment you are in clearly thinks it is supposed to be Swift 2, and that is the reason for the error messages.
It sounds as if you have accidentally opened the file in Xcode 7. That would explain it. Your code is now Swift 3. Xcode 7 is Swift 2; it does not know about Swift 3 and doesn't understand your code.
Now that you have converted to Swift 3, you can never use Xcode 7 with this project ever again.
Or maybe this is Xcode 8 but the legacy build setting is still on, so it thinks this is supposed to be Swift 2. But it isn't. It is Swift 3.
I started having an issue with Xcode 6.0.1 where the error "SourceKitService Crashed Crashlog generated in ~/Library/Logs/DiagnosticReports" started popping up and all syntax highlighting was gone in Swift. Then Apple released a new update Xcode 6.1.1 where mentioned this issue was resolved. So I updated my Xcode to 6.1.1 but this problem still exists. I my case the issue is just staying there and never disappearing.
I tried few solutions found in StackOverflow like deleting the content of: DerivedData/ModuleCache, cleaning up the project etc but the issue still exists.
I am not able to make a build and whenever I try to get these 2 errors.
/Users/MY_PROJECT/AppDelegate.swift:11:1: 'UIApplicationMain' class must conform to the 'UIApplicationDelegate'
protocol at UIApplicationMain in my AppDelegate.h file and this Command failed due to signal: Segmentation fault: 11
Here is the code of my AppDelegate.swift
import UIKit
#UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
var window: UIWindow?
func application(application: UIApplication!, didFinishLaunchingWithOptions launchOptions: NSDictionary!) -> Bool {
return true
}
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 throttle down OpenGL ES frame rates. 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 inactive 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:.
}
}
I'am not sure about the cause of this error, i was getting this sourcekit crash for various reasons. For you if you look into UIApplicationDelegate methods, they are slightly changed in the signature. For eg UIApplication parameter is not optional now.
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
// Override point for customization after application launch.
return true
}
So if you compare your delegate methods with new UIApplicationDelegate methods(if you command+click you can check the method signature)and make changes you may get rid off this error. Give a try.