How does one access, in code, a view they dragged from the Object Browser into another view in their storyboard?
For example, I created a UIView which I assigned to a ViewController class. Then I dragged a Map View into that view. Now I need to start manipulating that Map View in code. How do I access it? I've tried things like self.view.subview but haven't gotten anywhere from there.
Thanks.
You should use outlets, first select your storyboard file, then go to
View->Assistant Editor->Show Assistant Editor
Next select the map view, press control on your keyboard and drag to the right section of xcode that will show your .h file, the following will appear
Write mapView inside it and hit enter, this will create an outlet for you to use
Now you can use mapView to access your MKMapView
Related
I'm using Xcode 8 and working on a legacy .xib file and need to figure out how to programmatically move all the objects. Questions:
How can I programmatically reference the view (pointed to by the red arrow)?
Assuming I can reference the view, would programmatically moving it also relatively move the four buttons and label contained within it?
Here's a screen shot of the View hierarchy of the .xib file:
Normally, I would just create a UIView object in a separate .xib file with the contents of the view from question #1, and add it the .xib file referenced above but this is existing code and I want to minimize changes if possible.
Assuming you have a view controller for this story board, Option+click your source file to open it in the assistant editor. You CTRL+Drag from the document outline (where your arrow is pointing) to the spot in your source file where you want the outlet to appear and Xcode will create an IBOutlet for the view.
If your question is can you load just the view from the story board without the view controller. I suppose you could instantiate the view controller, take a strong reference to the view, remove the view from its superview and then trash the viewcontroller, but that seems a bit wasteful; in this instance I would copy and paste the view into its own nib.
Note that as far as moving the view, yes it will move all of its subviews. If this is a temporary animation kind of thing consider using the .transform property along with one of the UIView Animation methods. You can also CTRL+Drag the constraints from interface builder and manipulate the constraints in code. You should avoid setting the frame/center manually if you are using constraints otherwise autolayout will be fighting with you.
I am having a hard time understanding why you can put UIViews outside the UIViewController on the storyboard, and what the use case of it might be.
For instance, on the storyboard I can add UIToolbar, UIAcitivtyIndicator and UIProgressView that is outside of the UIViewController. Is this mean there is a way for you to reference those Views that are outside UIViewController and potentially display them somehow either programmatically or embed those like you would do with a ContainerView?
Yes, it absolutely is possible to do what you're describing!
When you add objects that are outside the view controller, they appear in what Apple calls the "Scene Dock". Apple has the following suggested usage for the scene dock:
If a view is not part of the main view hierarchy — such as a pop-up
menu — add the view to the scene dock. In a running app, the system adds
and removes these kind of views from the view hierarchy when they are
opened and closed.
The steps to make this work are below:
Open the storyboard.
Open the utilities area for the workspace window by clicking the
utilities button in the
toolbar.
In the utilities area, select the Object library by clicking the Object Library button in the library bar.
On the storyboard, select the scene to which you will add the extra view.
Drag a view class object from the object library into the the scene dock.
And importantly...
The added view is a part of the view controller. It will be
instantiated along with the rest of the views. You can attach the view
to a property of the view controller that has an IBOutlet. You can add
more than one view to the scene dock.
(These steps were originally copied from here - unfortunately this page seems to have been deleted by Apple at some point).
I am working on one view controller which has three static screens which i m going to show to user for first time when he installs the app, for next time forever i will show him main functional view.
Problem is
When i have created viewController class i never selected xib option.
Now i have added two xib's (iPhone and iPad) in project.First i deleted the present view from it then I have created three static views in each which contains some label and one button in each..
I want to add those views in my view controller's view. and i want to add targets for buttons in those view.
I am unable to reference outlets in my class for all three views
and can't add target for buttons in my viewController.
How can i do that??
Please help......
Solved it..:)
Problem was when i have added new xib file to project.i deleted the present view controller view from xib...thats why xib was unable to find any of the projects view controllers in custom class drop down
When you click on the File's owner on the left while the XIB is opened:
Select the the third icon on the far right, and make sure the correct class is selected under Custom class, the green textfield:
You need to select File Owner then go to the identity inspector in right pan of Xcode where you can select yor Xib name :)
I created a button on a view controller by dragging the icon of button in storyboard. I thought this would generate an object. is there an approach that I can get the id, i.e. the object of that button? Is there a method that we designate a label or identifier for that button and we can refer to it with certain methods?
Thanks in advance for answering.
When you drag a button from the object library onto your storyboard's scene, when that scene is instantiated at runtime, the object associated for that button will be created. If you want to have a reference to that object so you can interact with it programmatically, you can open the assistant editor:
You will want to make sure you set the custom class for your view controller and you simplify your life a little if you tell your assistant editor to "automatically" select choose the right associated .h file:
You can then control-drag (or right-click-drag) from the button down to assistant editor window and create either an outlet (an IBOutlet) or an action (an IBAction):
By doing that, you then have a reference to the button object that is created when the scene is instantiated.
Open Assistan Editor (Split View, so that you see Interface Builder on the Left and Your View Controller on the right.)
Ctrl-Klick & Drag on the button and drag it to the Controller (you'll see a blue line).
An IBOutlet will be generated in your ViewController and you can access it.
I've got a Table View Controller object in my Storyboard, but I've made it a custom class called StaticDetailViewController, which I created as a subclass of UITableViewController.
However, when I go to drag from the view to the .h file in the Assistant view, no connection option appears. Why is this?
You have to open and close your curly braces for your #interface in the .h file. For some reason it won't let you control drag using the assistant editor unless you do so... (screenshot)