If I understand correctly, you don't know in fact the exact type of canJump ? Have a look here to use unknown type: https://stackoverflow.com/questions/52896731/how-to-use-jsondecoder-to-decode-json-with-unknown-type

When I execute the function, the button appears (hidden = false) and then I have an animation that in a certain time (1s) varies the alpha from 1 to 0, upon completion it returns the value to 1 (thanks to you) and maintains I hide the image ( hidden = true ). It is right? Before you call, image is hidden and alpha is 1 (by default as defined in IB probably) Before animation, you unhide : image is visible Then animation is to change progressively alpha from 1 to 0 ; hidden remains false At the end of animation, you hide the image again. and you need to reset alpha to 1, otherwise next time you play you start at 0 You could also have written it at start: func showIcon() { statusField.isHidden = false statusField.alpha = 1 //<-

I created a plain vanilla objC project. From what you show I had to change: remove [self.window makeKeyAndVisible]; - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { // Override point for customization after application launch. // [self.window makeKeyAndVisible]; // << removed return YES; } correct the addSubview statement by removing dot before addSubview     [self.view addSubview:text]; - (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view. // Creates a text field somewhere near-ish to the center of the screen UITextField* text = [[UITextField alloc] initWithFrame:CGRectMake(50, 100, 200, 50)]; text.borderStyle = UITextBorderStyleRoundedRect; text.returnKeyType = UIReturnKeyDone; // Set the view background as white just to make sure we're in the right place... self.view.backgroundColor = [UIColor whiteColor]; [self.view addSubview:text]; } It works OK. The same works OK in Swift. In a plain VC. You could try to: option-clean build folder (one never knows!) -set the delegate for the textField (but that should not be needed) toggle keyboard from hardware / Software, just to see (cmd-K and cmd-shift-K) remove those 2 lines to simplify even more: text.borderStyle = UITextBorderStyleRoundedRect; text.returnKeyType = UIReturnKeyDone;

I did this: add an entry in the masterView left table with code for this row in didSelectRow             self.dismiss(animated: true, completion: nil) Seems to work.

Did you do the option-clean build folder ? Where is the extension defined ? In which file ? Is in in the another class the extension works as expected If so, try to define outside of any class.

Exact, I did not notice option-clean was now disabled. Just use Clean Build Folder. Could you show the 2 class definitions and post a screen copy of the Identity and type Inspector info for the files of the 2 classes ?

Could you show the relevant code ?

Replace         cell.textLabel?.text? = name by         cell.textLabel!.text = name And it works. You can test for safety: if cell.textLabel != nil {         cell.textLabel!.text = name }

You need to track the finger position using func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent) and func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent) Then compute which bar it is and display information accordingly in touchesMoved.

I want to use segue when I click the forget password icon , I do not see any segue in your code, just an IBAction call… One of the frequent reasons for such a crash is that you miss a connection to an IBOutlet from the storyboard, or that this connection is corrupted (if you have changed a name for instance). So, remove all connections from IN to LoginViewController and rebuild them. Do a clean build folder after, in case. Note: you have a typo (missing an n): forgotPasswordEmailCheckCotroller. But that's not the cause of the problem. Why don't you set directly the storyboard ID ForgotPasswordEmailCheckController directly in IB ?

The format for xlsx is pretty complex. That would be probably painful to develop. What you could do is create either a SYLK or a CSV file and open later in Excel. That's much easier to do.

Is it the complete code ? CloseButton is not added to the view, how do you get it on screen ? You should also define its frame. Could you show how you transition to secondView ?

In Swift, generally use nil instead of NULL.

You probably have other properties declared in addition to searchableText, and you don't initialize them…

When you init a CLLocation, you can ask to get speed info at each measure. Then, store this value in an array. And evaluate the max value in the array to get max speed, when you need. What distance do you want to measure: the travelled or the distance from origin ? For travelled distance, each time you get a CLLocation value, compute the distance from previous point (if update is frequent enough, evaluate this as sort(dx*dx + dy+dy) where (dx, dy) is the delta between the two CLLocation. Then increment a totalDistance Float value to compute the travelled distance so far. May read this for implementation details. https://stackoverflow.com/questions/38512443/provide-simple-method-to-get-current-speed-implementing-speedometer