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Thread: View locations

  1. #1
    Default View locations
    so here I go with another really noobish question:
    What I wanted to do today is to slide in a view from the bottom of the screen. the view is a full-screen view, just like it's superview.

    so, to simplify things, I tried just putting the view (let's call it view2) exactly over it's superview (view1). If I managed to do that it should be easy to get the view below the screen (by just adding it's height to the y-coordinate) and from there I can slide it back up.
    putting the view exactly over the superview is where I got stucked.
    first I tried something like this

    UIView *view2 = [[UIView alloc] initWithFrame:view1.frame];

    that, of course, didn't work because the coordinates of the top-left corner are based on the coordinate-system of the superview. however, I then tried this:

    UIView *view2 = [[UIView alloc] init];
    view2.frame = [view1 convertRect:view1.frame toView:view2];

    I thought this has to work. I was surprised that it did not.
    my question is: why did my second attempt not work? strangely, it does work when I add = [view1 toView:view2];

    but this does not help me as long as I don't understand WHY one works and the other doesn't.

    would it be bad coding style to just convert everything to the coordinate system of the window itself? would make things a lot easier for me I guess.
    what's the best attempt to do that? what's the best way to work with coordinates? how do I put a view below another? as you can see this is really basic stuff but I'm having a hard time with it

    I really need some help seeing clearly with all this. thanks a lot :-)
    Last edited by BlackWolf; 2008-03-18 at 03:01 AM.

  2. #2
    I would use a UITransition to handle the slide in.
    Starlight Computer Wizardry
    Pocket-sized Development
    Follow me on twitter: @NetMage

  3. #3
    Quote Originally Posted by NetMage View Post
    I would use a UITransition to handle the slide in.
    thanks for your quick reply.

    I guess you mean CATransition? That's the only thing I was able to find.
    Unfortunatly, I'm not really familiar with the whole Core Animation stuff. That's why i wanted to use the UIView's animation methods in the first place - they are pretty easy to use. Maybe you could just give a quick little example how I would go about using CATransition? I understand it's properties and everything, I just don't really know what to do with the CATransition object. I'm reading my way through the core animation guide, but I have so much to learn about cocoa it's really hard to learn all at once

    oh, and btw: still I'm asking myself why
    view2.frame = [view1 convertRect:view1.frame toView:view2];
    doesn't produce a view that is the same size and position as its superview. in my understanding of the frame property this is exactly what should happen. any ideas on this?

    thanks :-)

    PS: doesn't really fit into the topic, but is there any easy way to get the window object of a UIView? I did it using the superview property and stuff but that gets really ugly, because it results in something like [[[self.view superview] toolbarController] superview] ... any easy way to do this?

    PPS: another stupid, topic-unrelated question: When I have a UITextField and a user taps into it a keybaord appears. is there any way to hide that keyboard again, for example when the user taps anywhere else on the screen, or - in my case - I want to hide the keyboard before I start an animation.

    PPPS: I know, you all gonna kill me. has anyone an idea how to create a (pseudo-)random number?
    Last edited by BlackWolf; 2008-03-18 at 06:14 PM.

  4. #4
    No, he means there is a transition type that allows changing between views. There are a bunch of transition types, one of them is slide from any edge (you specify the direction.) If your parent view type is a UITransition view, there are methods that allow you to say 'transitionTo: newview' and it just slides in. Pretty slick, no?

    And for a whole bunch of animation types in demo/test view form, see: (grab ver 0.4 later in the thread.)

  5. The Following User Says Thank You to Cobra For This Useful Post:

    BlackWolf (2008-03-19)

  6. #5

    If you are using the SDK, look up Modal View Controllers on the proper way to handle this.
    Last edited by NetMage; 2008-03-19 at 08:36 AM. Reason: Automerged Doublepost
    Starlight Computer Wizardry
    Pocket-sized Development
    Follow me on twitter: @NetMage

  7. The Following User Says Thank You to NetMage For This Useful Post:

    BlackWolf (2008-03-19)

  8. #6
    the modal view controller and random number thing worked very fine, thanks to both of you.

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