In Swift 4 Xcode 9, if you load and present a Nib as follows, how do you dismiss it? This is an extract of my code in another ViewController from which the Nib gets loaded.
#objc func doPresent(_ sender: Any?) {
if let svc = Bundle.main.loadNibNamed("SecondViewController", owner: self, options: nil)?.first as? SecondViewController {
svc.data = "This is very important data!"
svc.delegate = self
self.present(svc, animated:true)
}
}
I tried:
self.view.subviews[0].removeFromSuperview()
and
self.view.removeFromSuperview()
as well as
self.dismiss(animated:true)
None of the three have the desired result. The first one removes a button from the Nib, the second just gives me a dark screen and the third dismisses the view in which the Nib is embedded to the original view in the navigation view.
I declared svc as a var at the class level and was able to use
self.v.removeFromSuperview()
That did the trick for me.
Related
I'm loading an array with data from a Firebase database in my AppDelegate as I need the arrays loaded before the views are created and loaded. How can I pass this array to a view controller to populate a TableView?
Edit:
I don't think I worded my question correctly nor provided enough information. I have this Firebase data that I need to load into an array. This array needs to be loaded into the app before it is used by the view controller that uses the array. This is because the view controller uses a cocoa pod that splits the array into a number of categories to be displayed in different tableviews. The repo for the cocoa pod I'm using can be found here.
My question then is where is the best place to load this array? My first thought was the AppDelegate, but the array is empty and as such the table view doesn't load. I'm pretty new to iOS programming so I'm open to any and all suggestions.
In the AppDelegate class:
var window: UIWindow?
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey : Any]? = nil) -> Bool {
//Fill your array, let's say it's called firebaseArray. I would recommend doing so in the view controller and not in the Appdelegate for better responsibility distribution in your code
let vc = YourViewController()
//And YourViewController must have a array property
vc.array = firebaseArray
window = UIWindow(frame: UIScreen.main.bounds)
//make your vc the root view view controller
window?.rootViewController = vc
window?.makeKeyAndVisible()
return true
}
When I'm trying to switch from one view to another using Swift 4 on XCode 9, it gives me this error.
libc++abi.dylib: terminating with uncaught exception of type
NSException
I'm using a button to switch from Main to LandingView. Main is the default view(main.storyboard) while LandingView is another view controller within main.storyboard.
Here's the code I'm using to get this to work.
let storyBoard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
let newViewController = storyBoard.instantiateViewController(withIdentifier: "LandingView")
self.present(newViewController, animated: true, completion: nil)
[Above] All contained in a IBAction for the button I want to use.
Just to clarify, LandingView is a Storyboard ID that I'm using to make the switch from default view to LandingView. Please note this is all contained under Main.storyboard.
You haven't specified newViewController's type.
Try this:
let storyBoard: UIStoryBoard = UIStoryBoard(name: "Main", bundle: nil)
let newViewController = storyboard.instantiateViewController(withIdentifier: "LandingView") as! younewViewControllerType
self.present(newViewController, animated: true, completion: nil)
To determine what you have declared your LandingView ViewController Subclass, you can reference Identity Inspector in Interface builder as in the image below:
Under Custom Class, the Class property defines your custom subclass. When declaring your newViewController, you must declare it as that type.
I have about 20 buttons linked to allKeys. I want the turnRed button to change the color of their text to red. I tried the following code:
#IBOutlet var allKeys: [UIButton]!
#IBAction func turnRed(sender: UIButton) {
var i = allKeys.count
repeat {
allKeys[i].setTitleColor(UIColor.redColor(), forState: UIControlState.Normal)
i -= 1
} while i != -1
}
When I press the turnRed button, my program crashes and xcode jumps to the appDelegate file and highlights the AppDelegate class with the error Thread1: signal SIGABRT.
The console says "Terminating app due to uncaught exception 'NSRangeException Reason: NSArrayI objectAtIndex
The issue here is that you are setting the variable i to allKeys.count, but since arrays in swift start with zero, the twentieth element should actually be allKeys[19]. Thus, when the loop is at i = 20, it tries to access allKeys[20], which crashes the app.
One way to solve this is to set i to allKeys.count - 1 instead, but a better way would be to use a for-in loop instead of repeat.
for key in allKeys {
key.setTitleColor(UIColor.redColor(), forState: UIControlState.Normal)
}
There are multiple ways to loop in Swift, and you should use the options to your advantage. You can find Apple's documentation for Control Flow here.
I would like to know if it's possible to use a Switch(toggle button) to change the function of a UIButton?
Right now my UIButton deals 4 cards. I'd like to use a Switch(toggle button) to make it pull cards from a different string array in order to deal a different selection of cards.
Right now I have managed to make it change label texts, background color or even have it deal different cards when its switched on and off. But that's as far as I can get.
Thanks in advance for any help or guidance!
#IBOutlet weak var mySwitch: UISwitch!
var array1: [Cards] = []
var array2: [Cards] = []
#IBAction dealCards(sender: UIButton) {
let cards = mySwitch.on ? array1 : array2
// Do things with cards
}
Just a simple example of how to do it.
I'm halfway capable of creating an array using the Swift language. But then being able to map this array to be displayed in the Main.storyboard on iOS is where I'm drawing a blank. I comprehend that there can be TableViewControllers and TableViews and TableViewCells, yet somehow I simply cannot make the step from
myArray ["Viktor Schauberger", "Nikola Tesla", "Wilhelm Reich", "John Bedini", "Walter Russell", "Ed Leedskalnin", "R. Buckminster Fuller", "John Keely", "Nathan Stubblefield", "Ismael Aviso", "Hector Perez Torres", "Thomas Henry Moray"]
to being able to display it in the iOS Simulator and then work from displaying an array of things to making them tappable. But for now, I'd just be content in figuring out how to use Swift 1.2 to display this Array visually in the TableView / TableViewController - whichever applies.
override func tableView(tableView: UITableView!, cellForRowAtIndexPath indexPath: NSIndexPath!) -> UITableViewCell! {
let cell = tableView.dequeueReusableCellWithIdentifier("Cell", forIndexPath:indexPath) as MyCell
// no "if" - the cell is guaranteed to exist
// ... do stuff to the cell here ...
cell.textLabel.text = self.Myarray objectAtIndex:indexPath.row;
// ...
return cell
}
try this one :)
or goto this link below this might help you https://www.weheartswift.com/how-to-make-a-simple-table-view-with-ios-8-and-swift/
for loading prototype cell
prototype cell