I have little problem with my app. On main ViewController i have embbed Container View with objective-C chart.
I have 2 buttons and always when i press it i need update this UIView. Everything like setNeedsDisplay() not working.
But when i go to another ViewController and going back, my chart is updated.
Here is my main controller:
By buttons i go to previous year and data not updated.
But going to Another ViewController and:
Booom data updated. Im trying methods like: IBAction when button is pressed call function setNeedsDisplay() for self or view.
Thanks for your time! PS: Its not table, its CONTAINER VIEW.
Here is my project tree:
TREE
and i have container view to embbed this:
view
So i just need refresh UIViewController when i press button. Doesnt have any conection with objective-c to swift code (just one string array).
Related
I'm trying to execute code when a button is pressed for an application but I can't find how to change the views after the code is executed. Is there a way to switch views how I want to or is there another way? Thank you in advanced, I'm very new to xcode.
edit: I'm trying to go from one view to another, not the view controller and yes I have one storyboard that I planned on using for the whole project if possible.
To execute code when a button is pressed, you have to set up a method that the button is hooked into. Because you said you're using storyboards, I'll assume your button is on the storyboard. Go to the assistant editor, hold ctrl, and click-and-drag from the button to the view controller's .m file (#implementation section). This will create an IBAction method, and any code in this method will execute whenever you press the button.
The method will look like this:
- (IBAction)aButtonPress:(id)sender {
}
According to your comments, you say you only want to change the on-screen view, and not transition from one view to the next.
Views are added and removed with the following methods:
[aSuperview addSubview:aSubview];
[aSubview removeFromSuperview];
I can't really tell you much else with a lot more detail from you... and even though I asked twice in the comments and you said you only want to change the view, not the view controller... I think you probably need to transition to a new view controller. Impossible to know for sure as you've given almost no detail...
But if you want to transition between view controllers (which also transitions views), then ...
Create two view controllers on the storyboard. Hook them together with a segue, and give that segue a name. Now, to perform that segue in code:
[self performSegueWithIdentifier:#"YOUR_SEGUE_NAME" sender:self];
I am looking at Apple's Date Cell (Date Cell Link) example project and I have a question about the Scene Dock in MyTableViewController. How come there are items extra items in the scene (Like Picker and Done) that are next to First Responder, Exit, and My Table View Controller? How can this be done? Also, how is this helpful?
This image shows the Scene Dock that I am referring to. Don't mind the titles, I renamed the project.
This image shows the Scene Outline for MyTableViewController, where the Picker and Done Button are shown next to the My Table View Controller, First Responder, and Exit and not within My Table View Controller.
This image shows an expanded outline for My Table View Controller where the Picker object is found also. But not Done Button is nowhere to be found inside My Table View Controller.
This image shows the code to connect to Picker and Done Button There is nothing special to this.
When I delete UIDatePicker in the scene of the controller (not in the cell), the inline DatePicker still works.
I think this sample is meant to support iOS 6.1 or earlier, to reveal the UIDatePicker as an external slide-in view, so it needs to be in the controller for IBOutlet connection.
Hope this will help.
Normally, the MyTableViewController should not be of type UITableViewController but its superclass UIViewController. This is normally necessary because UITableViewController has by definition its main view property set to the table view. It is then difficult to place other views into this view.
With a UIViewController, however, you can add any number of views. This is necessary in this case to accommodate the button and picker. The table view controller functionality can still be achieved by manually adding the UITableViewDataSource and UITableViewDelegate protocols and overriding the appropriate methods.
However, Apple here shows that it is possible by placing the other views on the same level as the main view, the table view. This is admittedly quite confusing. I usually prefer adding non-standard views as subviews to the view of a plain UIViewController.
You can drag things like picker views from the library to the scene dock to add them there.
As to the utility of doing this, I have no idea what that would be.
In this case I think that the picker and done button are left over from the writers of the code experimenting with ideas and forgetting to delete them. To verify that just delete the picker view and done button and see if everything still works.
This is maybe a simple question, but I don't have a clue the keyword i had to search for this...
I want to create a simple selector (I called it spinner in Android). This is what i want to achieve
Or it will take a whole screen if it's in ipod touch / iphone.
So, I have 3 button that represent filter (category, country, sort) for a ListView... and if I press one of the button, a popover / dialog should be appear to select the filter for each button.
thanks...
Please let me know if I need to add some information to make the question clear.
Its not so much typical that is it appearing.
Create a new UIViewController class with xib and adjust view size you want to display for combo box or popviewControoler. Then put navigation controller over and tableviewController.
And customize your UIViewController using its controller class. Controller class will be reponsible for displaying and selecting data.
Now in your MainViewController From where you want to show ComboBox or popviewcontroller.
declare popViewController instance variable,synthesize it.
implement a userdefined method here alloc your popviewcontroller class and assign it to popviewController instance variable of your class.
Then called it didSelectRowAtIndexPath.
When popover dismiss you set popViewController result in instance variable of this class so it can easily access in MainViewController class.
You can achieve combo box like functionality by adding a UItableView in a UIView and implement all the delegates of UITableView in that custom view.
Now you can add object of that custom UIView where ever you want that combo. Just you have to workout with some Frame setting.
In the view controller that has a UITabBarItem, i realized that viewDidLoad() method only gets called the first time when the tab bar item is clicked. So I dont know how to bring up the dynamic graphics when it's clicked the 2nd time. Can some guru help me on this? thanks in advance.
Should I conform to some kind of delegates or should i do it within didSelectViewController method on the root controller of all the tab bars? If i do the later one, it just seems to be weird since i think the controller that has the corresponding tab bar item should render itself instead of doing the rendering on root controller..
You want to put any code that should run every time the view controller appears in viewWillAppear: instead of viewDidLoad. viewDidLoad is designed for code that should run when the view backed by your UIViewController is created (and then possibly re-created after being thrown away during low-memory situations).
Actually i resolved this by using the parameter passed into the callback didSelectViewController(param).
I am creating a project with Xcode 4.2 and using it's storyboard. In one of the views I have a button that a user will tap and it will perform some calculations. If the calculations are correct I need to display the view that they just came from. I am currently using a Navigation Controller. When the app starts it loads View 1. When I choose an option it loads View 2. If I click the 'back' button in the toolbar it loads View 1 with left animation.
In my IBAction method for the View 2 calculation I have the following snippet.
[self performSegueWithIdentifier:#"BackToView1" sender:sender];
But the problem is it loads View 1 using the left animation when I need it to load the right.
Would that be a custom segue? Am I missing something?
[Edit]
I just noticed something as well. When View 1 loads from my IBAction it appears it is initializing the AppDelegate again, whereas the 'back' button does not. I need to not initialize the AppDelegate since I am loading a data object at the start of the app. Calling init again kills my object.
You could try using the navigation controller to pop back. This will probably produce the effect you are after.
[self.navigationController popViewControllerAnimated:YES];