I am wondering if it is possible to dynamically create segues between views. I am generating all my UI buttons programmatically. Is this possible? I haven't been able to find anything on this topic.
Thank you
I am not sure what you mean by "create segues". But if you mean creating buttons which perform segue on being pushed, you can use performSegueWithIdentifier:sender: on UIViewController in respective action. Docs here.
If you want to transition to view that there is no segue to, I suggest directly calling presentViewController:animated:completion:.
Related
Is there a way to use custom segues to individually animate several different subviews.
For example, I want my modal view to appear by the UINavigationBar fading in (as the source destination's UINavigationBar fades out) and then a UITableView to slide down the screen 'over' the source destination's view controller.
When I try to implement this in the - (void)perform method. My properties don't animate using [UIView animateWithDuration: animations: completion:].
Can anyone provide me with a solution?
Thanks in advance!
You can certainly use custom segues to achieve this - however, I don't think you'll get much help without more details about the setup of your view controllers.
Everything you describe is correct: to create a custom segue you animate the views inside your sourceViewController and destinationViewController inside the segue's perform: method. If they're not animating you might want to check that your segue is actually getting called (you can use breakpoints in the debugger to check this), or that the views you're trying to access inside your view controllers actually exist at that point in time (again, something you can check using the debugger).
For a solution specific to your app you're almost certainly going to have to provide more details about the two view controllers you're trying to transition between. Perhaps you could post your perform: method.
I have an iPad project I'm working on that dynamically creates a number of buttons that I need to add to the main view of my application. I was planning on firing a method that lives inside my View from my ViewController...say it's called add_buttons. It's my impression that in the MVC pattern, the view should handle the rendering of buttons and the general display, but the controller should handle the interaction. I'm also under the impression that it's bad design for the view to "know" about the view controller.
So I guess my question is, should I have my button tap logic contained in my controller? If so, how do I handle the separation? If I'm creating the buttons in my view, then it would have to have a reference to the view controller to use as the delegate for the event handler. If I create them in the controller, then I feel like I need to set certain UI elements in the controller which seems wrong to me. I know I'm missing something obvious but searching so far has proven fruitless.
Can anyone point me in the right direction?
The button tap logic most certainly belongs in the controller.
The code that creates the buttons probably belongs in the controller too. However, it would make sense to include a view method that returns a button with its appearance configured but not its behaviour.
Some general pointe:
View controllers and their view are very tightly coupled.
If in doubt it's best to put the code in the view controller.
A views interface should deal with primitive data types (e.g. strings, numbers, images). Views should not need to know the specifics of model objects.
Also, the naming convention for methods lowerCamelCase. Eg:add_button should be addButton.
when you add button to view,
[myButton addTarget:nil action:#selector(myButtonPressed) forControlEvents:UIControlEventTouchUpInside];
in view controller add
-(void)myButtonPressed {
}
with target:nil event will be handled by first controller containing this view
I rescently finished a project where I had to dynamically create UIViews which contained both UITextfields and UILabels.My approach to this problem was to call the "addViews" function from within the view controller. I figured this to be a better and easier approach rather than dealing with view controllers from inside the UIView. I have tested my approach and works completely fine (dynamically change UIView size and adding other UIViews with a UITextfield and a UILabel).
i'm looking three20 and I wish make this thing: use a TTWebController but implement the feature that is shown on the 'Table with drag refresh', drag to the bottom and the webpage will be loaded, showing on the top the arrow like twitter, like many apps... it's possible to do this?
how can I do this?
thanks in advance
Pull to refresh is implemented as a Table View Delegate and the TTWebController is a simple controller with a uiwebview in it.
One way around it would be to create a new TableViewController with the TTTableViewDragRefreshDelegate as the table delegate. You would then create another cell with the web view.
A problem with that solution is that the web view has it's own scroll view and that will take precedence over the tableview scrollview. so you would actually need to make sure you drag the table and not the webview.
All in all I suggest you not do it :) and use a button for the refresh.
I am trying to develop an application that has screen flow similar to oracle app. I have attached the images here. Can anyone please tell how this can be achieved ?
Thanks in advance.
What you are looking for is a custom Split View Controller. The screenshots you provided are of custom split view controllers. The UIKit has UISplitViewController but this must be a fullscreen view controller.
To make a custom split view controller there's the old way, by having a main view controller and making your two master and detail controllers, adding their view to the main view controllers view.
You need to forward on calls from viewWillAppear:, viewWillDisappear: etc from the main view controller to the two controllers that you manage.
As of iOS 5, you can do something similar with view controller containment, this has a few more bells and whistles, more interesting it handles rotation animations better and all the call forwarding to the children controllers that you had to do manually in the first solution.
Check out this link for more details on custom split view controllers:
http://www.mindtreatstudios.com/how-its-made/custom-uisplitviewcontroller-ios/
To answer your question directly: if you make a custom split view controller - yes you can add this as a detail view controller. But watch out, this isn't a UISplitViewController, so just be careful not to use that term so much.
Haven't really tested this, but doesn't this solve your problem?
Create a storyboard file
Drop in a SplitViewController
Delete the DetailViewController
Drop in another SplitViewController
Link the two together using CTRL-drag and select Detail
Set the size of the detail-splitviewcontroller to Detail
????
Profit!
Anyways, not sure if it really works, but give it a try. This is IOS5 though (I think, might try it out with IB).
It'll look something like this:
If you're going to have to write your own class, you might want to first look at https://github.com/mattgemmell/MGSplitViewController for inspiration.
When I switch tabs in my tab bar application, one of my views needs to update because the user may have changed a preference that affects it. It is a UIViewController's view, but when the views switch, the viewDidLoad/Appear methods aren't called. Can this be solved using an NSNotification or any other way? Please give example code, especially for NSNotifications, as I am new to them.
You might want to peek at UITabBarControllerDelegate and tabBarController:didSelectViewController:. There you can determine how to handle the view change and whether you need to update the view based on the possible preference change.
tabBarController:didSelectViewController: you can implement this method in the appdelegate.
you will get the sxact root view controller at which yopu clicked . then you can update that view .