Hi can anyone let me know which control they have used for doing the scrolling.
I like that control very much.
http://www.youtube.com/watch?v=Ssa2k4RlYXs&feature=channel
Application is free to download. Help me to figure out which control is this.
Application URL: itunes.apple.com/us/app/xix-cwg/id353382539?mt=8
Help me out.
Control is inside: Schedule Tab in the application
Thanks in advance.
Regards,
Arpan
Most likely that video is just a UIScrollView. While it shares a lot of the properties of a UITableView you may notice that a UITableView is a subclass of a UIScrollView.
There are a number of ways to create that functionality. I recommend looking at the documentation for UIScrollView. You may be able to find some glue between a UITableView and a UIScrollView. If you decide to write your own UIScrollView subclass keep in mind memory issues. You will have to unload the "not visible" portions of the view if you are displaying a lot of data.
The UIScrollViewDelegate protocol has the scrollViewDidScroll: method that you can use to do custom view layout as the view scrolls.
You can use the contentOffset property to get the position of what is being displayed in the larger scrollview.
I think you will find its not that hard, once you experiment with UIScrollView. Especially if you aren't planning on do any zooming.
Related
I am developing my first app for OSX. Sorry for asking stupid questions. I have spent a few hours trying to figure this out on my own, with no luck so far.
I want to make an iTunes-like interface. I used NSSplitView, placed NSView for navigation and NSTableView above that. [I am aware that there better alternatives to NSSplitView, yet my goal is to both - develop an app and also to learn Cocoa/OSX in the process.]
Atop NSView panel designated for navigation, I am trying to place NSTableView. However, my table is not being displayed. I therefore have questions...
I understand that for cells to be populated, controller must implement NSTableViewDataSource. I tried that, but was so far unsuccessful - to the point that I don't see the table. Please advise:
Can I have a working NSTableView-derived custom class also implementing NSTableViewDataSource? If this cannot work, please advise why or point me to an explanation.
Am I correct in thinking that all elements can be manipulated programmatically, in the sense that I use IBOutlet in headers to point to the right object, yet do nothing with InterfaceBuilder - have everything controlled from within my Objective-C code? Do I have to use IB?
Thank you.
Yes that will work but it's an unusual approach. Generally the tableview delegate/datasource is something enclosing the tableview. You'd normally only subclass NSTableView if you require some additional functionality not provided by default (for me that has been custom behaviour to input).
Yes you can do it all programmatically, however you will find it much easier to use IB. The IB-loaded views are created programmatically under the hood, using the information contained in the nib file. You will find it long-winded and tedious pretty quickly.
WRT to your issue with not seeing the table, you will need to add logging/breakpoints on the few key delegate/datasource methods to ensure they are being called (start with the daddy of them all numberOfRowsInTableView:). If they are not then you aren't setting the delegate/datasource correctly in the tableview.
I'm trying to make a large UIScrollView with various UI elements on it which is larger (wider) than the iPhone's screen.
I'd like to be able to lay those elements out in a UIView, and then load that UIView into the UIScrollView. This way, I can clearly see in Interface Builder what I'm doing with that large view.
How can I do this, with Storyboards active? I'm trying to do something similar to the #2 example here, but using Storyboards:
http://agilewarrior.wordpress.com/2012/05/18/uiscrollview-examples/
See if this tutorial from Ray Wenderlich helps, which goes into pretty good detail about UIScrollView :
http://www.raywenderlich.com/10518/how-to-use-uiscrollview-to-scroll-and-zoom-content
If you're doing layout programmatically, please take note of this important comment:
You might ask why we don’t do all of the above in viewDidLoad, and you’d be right to ask. The reason you can’t is that the view size isn’t definitely known until viewWillAppear:, and since you use the size of scrollView when calculating the minimum zoom, things might go wrong if we do it in viewDidLoad.
Good luck!
I'm looking to implement the same technique used by atebits in the Twitter app to achieve very fast UITableView scrolling,
http://blog.atebits.com/2008/12/fast-scrolling-in-tweetie-with-uitableview/
But, due to Tweetie being purchased by Twitter, atebits has ceased to exist and the sample code has gone, along with all of the css for the site.
Does anybody have a copy of the sample code or a different resource on implementing this method of drawing UITableViewCell's into one view?
Available here: https://github.com/enormego/ABTableViewCell
He is simply doing his own drawing in the drawRect: method inherited from UIView. See also Tricks for improving iPhone UITableView scrolling performance?
The scenario is that I have a UIViewController containing multiple "InteractiveUIImageViews" (inherited from UIImageView) each containing their own UIImage. In InteractiveUIImageView I have iplemented methods for touchesBegan, touchesMoved and touchesEnded to handle their movement and behaviour on screen. Certain objects of this type will be set as 'containers' (think recycle bin) with the objective being that when one image is dragged onto it, it will be removed from the screen and placed inside it to be potentially retrieved later.
My current thinking would be to call a new method in UIViewController from the touchesEnded method of my InteractiveUIImageView but being new to all this I'm not really sure how to go about doing that (e.g. calling a method from the 'parent') or indeed if this is the best way to achieve what I want to do.
Thanks in advance for any advice.
I'm afraid your question is (too me at least) a bit unclear. I get that your are trying drag a UIImage around a scene and drop it in drop-locations.
What is unclear is you class hierarchy. I believe that you are going about it in a wrong way. You shouldn't have to subclass UIImage at all.
Instead I would urge you to let the UIViewController manage the movement of the images. When you touch down on an image, you also touch down on its parent (containing) view.
What you have to to is then reposition the UIImage (all handled by the UIViewController) as you drag the image across the screen. When you let go you check if your finger was inside your drop-zone on touch up.
Afternoon, I have a UIImageView that I progmatically add to the window. Infact I have multiple UIImageViews that do so and when I click on any specific UIImageView I want it to become 'top-dog' so to say and be drawn over all other objects on the screen. Basically like the priority drawing for MSWindows operating systems when it comes to their windows. I've scoured all the options built in for UIImageViews when it comes to layering but I cannot seem to find any! I know it exists because in UIBuilder there is a command for sending back/front toBack/toFront. How do I access these progmatically?
Edit*
Also I fear that you might have to access the order in which the subViews are pushed into the 'subView stack' and manually move these around to achieve the result that I want and if so, how would I go about doing this?
Edit2*
Perhapse these are the functions I'm looking for?
bringSubviewToFront
sendSubviewToBack
exchangeSubviewAtIndex
Does this allow for easy Index shuffling?
UIView class has bringSubviewToFront: and sendSubviewToBack: for changing subviews z-order (see "Managing the View Hierarchy" section in class reference for more).