How to load a UIView and display it?

cocos2d for iPhone » Programming » cocos2d support (graphics engine)

How to load a UIView and display it?

(14 posts) (4 voices)

Started 2 years ago by ima747
Latest reply from Mik

Tags:

ima747
Member

I've been looking all over, and this is pretty basic stuff but for the life of me I can't get it to work.

How do you load a custom UIView or view controller and display it.

If I make a custom view controller with the view in it, and add it as a property of the app deligate, and link it in IB it works perfectly. I can access the view and add it as a sub view to the window and it shows all the stuff I laid out in IB. However when I use [[MyController alloc] initWithNibName:nil bundle:nil]; I get nothing. Checking the debugger it has a view in there. And puting NSLogs into the loading and initing code it's loading but I can't for the life of me get it to display.

Can someone just give me example code of how to load a subclassed UIViewController from the main bundle and nib and attach it to the window without it being a linked property?

Posted 2 years ago #
rolando
Moderator

If you create a new controller, it doesn't mean that it will
immediately display. You should set the window's view to the view of
your controller. If you're using cocos, you should have a window into
which the director is attached, so you should do something like:

window.view = mycontroller.view

or something like that.
hth,
--
Rolando Abarca M.

Posted 2 years ago #
ima747
Member

Appologies, I must not have been clear. That's what I'm doing. However the view does not display if I load the the controller myself. only if the controller is loaded by being linked into a property of something that's loading (i.e. the app deligate) does the controller load and is displayable.

Posted 2 years ago #
ima747
Member

i.e.

if my app deligate has
@property (nonatomic, retain) IBOutlet MyControllerType *myController; // IB links MyController into this

[window addSubview:myController]; // runs at start

this works perfectly.

however if instead I have
myController = [[MyControllerType alloc] initWithNibName:nil bundle:nil];
[window addSubview:[myController view]];

I get nothing. I know I must be missing a link or an init call of some kind but I don't know what to do and all I can find is discussion on theory, or things that use existing navigation controllers and push the view controller in there. I just need an example of how you load a custom UIViewController and initialize it properly.

Posted 2 years ago #
rolando
Moderator

Since you're subclassing UIViewController, and initializing with a nil nibname and bundle, are you overriding loadView in order to set the view property?
If you're not overriding loadView, is the nib file named the same as your controller class?

Posted 2 years ago #
ima747
Member

the UIViewController has it's view assigned in the NIB, shouldn't that provide the right view for it to load when it's initialized? When I use
@property (nonatomic, retain) IBOutlet MyControllerType *myController; // IB links MyController into this
instead of initing it myself it loads the view fine.
The nib it's in is the only nib for the app, MainWindow.xib. In there I've had no NIB name set to the view controller, as well as setting it to MainWindow, neither option made a difference to either failing to load it myself, or sucessfully having the assigned property load it.

The UIViewController in IB has it's class set to MyControllerType.

Posted 2 years ago #
rolando
Moderator

Do this:

Create a new nib, named as your controller class, and there put your
view.

tell us how it works.
--
Rolando Abarca M.

Posted 2 years ago #
ima747
Member

No difference. if I change
myController = [[MyControllerType alloc] initWithNibName:nil bundle:nil];
to
myController = [[MyControllerType alloc] initWithNibName:@"MyControllerType" bundle:nil];
which I think I should have to do since it's not loading out of the base nib any more, it crashes.

Posted 2 years ago #
ima747
Member

ooo the crashing is a good thing I'm getting an error log saying that the nib loaded but no view was set. which I don't understand because it's linked to the view in IB... but atleast I know why(ish) it's failing now

Posted 2 years ago #
ima747
Member

AHA! IB still seems like it was organized by incontinent monkeys to me, but atleast I got this sorted

The File's Owner in IB gets set to the UIViewController subclass then link the view off of that to a UIView in the file with your content.

Thank you rolando, you were very very helpfull.

In conclusion for those that get tripped up on this too.

MyViewController.m/.h is a UIViewController subclass
MyViewController.xib is a NIB, set the File's Owner class to MyViewController, create your view etc. and link that to the File's Owner's view outlet
Then use
MyViewController *myController = [[MyControllerType alloc] initWithNibName:@"MyControllerType" bundle:nil];
[window addSubview:[myController view]]; // replace window with whatever view you're adding it into, etc. the line above is the important one to load the thing

Posted 2 years ago #
rolando
Moderator

glad you found the problem. Yes, I forgot that you had to set the File's owner. I think that you shouldn't need to set the nib name, though: if you pass nil as the nib name, it should load it anyway, given that it's named consistently, i.e. your class's name is MyClass, the nib is named MyClass.nib (.xib's are compiled to .nib)

anyway... good to be of help.

cheers,
rolando./

Posted 2 years ago #
Mik
Member

hi, i've been trying to do this and i finally got the UIViewController to come up on the window in my cocos project
but i have a big problem: the UIView comes up rotated and i dunno why
i tried everything but still can't figure out how to disable the rotation thingy

this is the code i'm using

-(void)showOptions:(id)sender {

OptionsViewController *optionsVC = [[OptionsViewController alloc] initWithNibName:nil bundle:nil];

[[optionsVC view] setFrame:CGRectMake(0, 0, 480, 320)];
[[emptyController view] addSubview:optionsVC.view];
[opcionesVC release];
}

Posted 1 year ago #

Codemattic
Moderator

in your view's controller's -viewDidLoad try adding:

...
 self.view.center = CGPointMake(160, 240); //or where the view's center point is
 self.view.transform = CGAffineTransformMakeRotation(M_PI * 0.5); //90 degrees
...

How to load a UIView and display it?

Reply