I created a new Xib file, called MainViewController.xib. I dragged a View onto the builder, then plopped a UIButton on top of the view. Nothing happened, my button is on the view but not considered a subview. There is no hierarchy tree on the left column under the View icon that tells me my button is a subview.
Why is that? Every time I control+drag from the button to the view icon, the information for constraints pops up, instead of anything regarding an IBOutlet connection.
I'm using Xcode 7.1.2
I can control+drag to from my button to my .h file and create a property, but other than that, it's not recognized as a subview. Any help at all will be appreciated, I'm losing my mind.
Related
I'm trying to add my text field as an Outlet in my ViewController.swift, but when I drag the text field from the Main.storyboard to the ViewController it only shows as action and I cannot change it to Outlet.
I had this problem too! I fixed it by clicking on the top bar of my UIViewController (in the storyboard looking window), then selecting the Identity Inspector on the right and in the top where it says Custom Class in bold there is a field called Class which I set to the viewcontroller file I was trying to control-drag the UITextField to. Once the Class was set to the right name I was able to control-drag for an outlet. I hope this helps.
In Xcode 7.3, when I drag in a Table View from the Object Library to the Storyboard for a single view app, it doesn't automatically expand to the full size of the view. I seen it do that in my Udacity class videos and in other videos on YouTube. Is there a setting in Xcode that will correct this? Thanks.
Yes, you need to "pin" the tableView at the ViewController. Am I right you have a simple ViewController and add a tableView to it?
Now, you need to open the Pin Menu and uncheck the checkbox "Constrains to margins". Now you add the constrains to the top, left, right and bottom to 0 and save it. Now the TableView should stretch the whole display.
If you only show a table in the ViewController you should use a UITableViewController.
I currently have 3 tabs connected to a common UITabBarController. When one of the tabs is selected the user is taken to a UITableView with 3 cells which can be selected. When a cell is selected the user is taken to a new page with a UINavigationBar at the top. My understanding is that the UINavigationBar is supposed to include some sort of back button and I couldn't figure out how to enable it.
In place of the default back button, I dragged a UIButton to the corner and connected it to the 'Show Detail' property of the previous view but when I press the UIButton I am taken to the right UITableView but the tabs are missing for navigation. What am I doing wrong? My segues look like this:
The UINavigationController has the back functionality. How to go back one view in UINavigationController?.
Here is some old tutorial on how to combine that with a tabbarcontroller. should still be the same principles.
I can't get the standard back button of iOS into a navigationBar because I can't find it in the Object Library, so can I do it with code or something else?
I just want the normal, standard, blue back button - you know which I mean.
To "automatically" have a back button you need first have a UINavigationController. Then you need to take a different UIViewController and add it as the root view controller in UINavigationController's init method:
UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:someOtherViewController];
Be sure to also set a title for someOtherViewController, usually in it's viewDidLoad or initializer. I'll tell you why this is important in a second:
self.title = #"Some other VC";
Then take a second UIViewController and push it onto your navigation controller:
[navigationController pushViewController:anotherViewController animated:YES];
You now have two UIViewControllers on your navigation stack: someOtherViewController and anotherViewController.
Your view will now have a back button with "Some other VC" in it. This is the title of the view controller that was just moved out of view:
http://developer.apple.com/library/ios/#documentation/uikit/reference/UINavigationController_Class/Reference/Reference.html
http://simplecode.me/2011/09/04/an-introduction-to-uinavigationcontroller/
I would also suggest reading up on how UINavigationControllers work and searching this site a bit more for customizing the back button. There are plenty of threads about it.
You can't add the back button yourself. The back button is part of the Navigation controller. If you embed a Navigation controller into your view(s), the back button will appear and be populated by the name of the previous view.
If you're using storyboards select your view controller, then in top menu choose "editor" -> "embed in" -> "navigation controller".
Edit: Here is an exmaple.
I'm running Xcode 7.2. This was driving me crazy, but I figured it out. Here are all the pieces you need to make the Back button appear (make a test project to prove it):
1) You have to have a Navigation Controller and it has to be set to be the initial view controller. So add the Navigation Controller, you will import two tables. Click on the Navigation Controller and on the properties list, check the box that reads "Is Initial View Controller". You will now see and arrow pointing to this view.
2) In our case we want a ViewController and not the included / connected TableViewController, so delete the TableViewController (RootController) and add a new ViewController.
3) Connect the Navigation Controller to the new ViewController by clicking on the top bar of the Navigation controller and orange circle with the arrow pointing left. Hold the Control button on your keyboard down and click and drag from the orange circle to the ViewController and let go. When given the list of options on how to connect the two views, select 'root view controller'.
Done! Now you the functioning navigation bar and you automatically get the back arrow on all segues added. Test this. Add another ViewController and connect to it with a button on the existing ViewController. Use the Control-click-drag approach from the button to the newest ViewController. Select the 'show' option for the new segue you created.
Run it. You'll see the back option has automatically appeared when you click the button and moved to the newest ViewController.
This is all provided by the Navigation Controller, but only when you make another controller the RootController. Happy navigating!
Please glance at the image below and help me find a File Owner for the class.
Generally i would connect my UILabel to it, but, alas, i can't find it.
Question: What should i connect my Label to?
Storyboard:
Meanwhile class is set up as
As storyboards don't have an owner, you can use the View Controller instead.
Ctrl click (or right click) the label, drag the blue line to connect up with the orange View Controller.
Right click the Label and connect to the View controller scene
You have put your finger on a key difference between storyboards and nibs: when a nib is loaded, an owner instance is specified, but a storyboard is not loaded with an owner, so there is no file's owner in a storyboard. Your ViewController instance is created by the storyboard and is proxied in the scene (listed as View Controller), so you can draw a connection between that and an interface item. But if you want to form a connection with an already-existing instance not represented in the storyboard, you'll have to identify that instance in some other way (perhaps by a tag) and find it and runtime and form the connection in code after the storyboard loads.
For example, in this code, I manually load a storyboard (to use its initial scene in a popover) and then form connections from some bar button items within it:
UINavigationController* nav =
(UINavigationController*)[[UIStoryboard storyboardWithName:#"Storyboard"
bundle:nil]
instantiateInitialViewController];
// there is no file's owner...
// so we can't just draw the connection from button items to ourself,
// because we are not proxied in the storyboard
// so, locate the button items in some other way and do it in code
UIViewController* root = [nav.viewControllers objectAtIndex: 0];
[root.navigationItem.leftBarButtonItem setTarget:self];
[root.navigationItem.leftBarButtonItem setAction:#selector(save:)];
[root.navigationItem.rightBarButtonItem setTarget:self];
[root.navigationItem.rightBarButtonItem setAction:#selector(cancel:)];
In some cases, there's a trick you can use to inject an arbitrary existing instance into a scene so that a connection to it will work: make that instance the first responder. There is a first responder proxy in every scene, so this can give you something to connect to by drawing within the storyboard. So, this code could work instead of the above:
[self becomeFirstResponder];
UINavigationController* nav =
(UINavigationController*)[[UIStoryboard storyboardWithName:#"Storyboard"
bundle:nil]
instantiateInitialViewController];
(And the button action connections have been drawn in the scene from each button to the first responder proxy object.)
Menu: Navigate - Reveal in Project Navigator
In the Project Navigator, Click on the "Main Storyboard"
Menu: View - Show Assistant Editor
You should have the Storyboard on the left with your label, and the view controler.h text on the right.
Click on your label, hold down the control button, and drag a blue line to the View Controler.h source code on the right. Type in a reference name (for example myLabel), and click connect.
Automagically you will see something like this generated:
#property (weak,nonatomic) IBOutlet UILabel *myLabel;
Inside the View Controler.m, you will see something like this generated:
#synthesize *myLabel;
Inside your IBAction events, you can set the label:
myLabel.text =