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• iPhone/iPad SDK: homescreen/Photos style grid view?

  - by igul222

  I'm building an iPad app, and would like to use a "tiled" display with objects arranged in a grid, similar to the iPhone/iPad home screen and the iPad photos app. More examples of this interface: http://itunes.apple.com/us/app/flipside-hd/id364916273?mt=8 http://itunes.apple.com/us/app/evernote/id281796108?mt=8 Is there any pre-built way in the SDK to do this? If not, how should I go about creating my own?

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• UIScrollView subviews not showing at first

  - by igul222

  I created a custom UIScrollView subclass that works a like a UITableView, keeping a collection of subviews and re-using them whenever the user scrolls. It's implemented like this: -(void)layoutSubviews { for(UIView *subview in [self subviews]) [subview removeFromSuperview]; // then re-add subviews after changing the frame and some attributes } This works fine with simple UIViews, but when I try to do it with a UIView that has a UILabel subview, the "base" view appears fine, but the UILabel doesn't show up at all. I can get the UILabel to show up by scrolling the entire UIView off screen and then bringing it back on. What could be causing this? So far, I've tried calling [myUIView setNeedsLayout], [myUIView setNeedsDisplay], and [myUIView layoutIfNeeded] from various places. None of them worked, and the last one crashed my app. I've also done the same thing to myUIScrollViewSubclass, with similar results.

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• Textile parsing in Objective-C?

  - by igul222

  Are there any libraries to parse Textile (Textile to HTML) which will work in an Objective C iPhone app? C libraries will work too.

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• Darkening a UIView

  - by igul222

  I'd like to "darken" a UIView by a certain amount. Right now, I'm doing the darkening like this: UIView *overlay = [[UIView alloc] initWithFrame:mainView.bounds]; overlay.backgroundColor = [UIColor blackColor]; overlay.alpha = 0.5f; [mainView addSubview:overlay]; Unfortunately, this also adds a semi-transparent black overlay to parts of mainView that are transparent. Is there any way to only darken the non-transparent sections?

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• iPad modal view controller similar to Mail.app?

  - by igul222

  How can I create a modal window in my iPad app similar to the one shown on Apple's website for composing messages in Mail.app? Example: Thanks!

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• Get height of UITableView without scroll bars

  - by igul222

  I need to get the full height of a UITableView (i.e. the height at which there would be nothing more to scroll). Is there any way to do this? I've tried [tableView sizeThatFits:CGSizeZero], but that only returns a 0x0 CGSize.

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• UIView "suck" animation

  - by igul222

  I'd like to use the UIView "sucking" transition (view is "sucked" into a point) referenced here: http://iphonedevwiki.net/index.php/UIViewAnimationState#Using_suckEffect The method above, however, uses private APIs, which makes it next to useless for an App Store app. How can I recreate a similar effect without relying on private APIs? I'm guessing the answer has to do with OpenGL, although I have zero experience there.

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• iPhone: Disable the "double-tap spacebar for ." shortcut?

  - by igul222

  By default, if you tap the spacebar twice on the iPhone or iPad, instead of getting "  " (two spaces), you get ". " (a period followed by a space). Is there any way to disable this shortcut in code?

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• Obj-C memory management: why doesn't this work?

  - by igul222

  Why doesn't the following code work? MyViewController *viewController = [[MyViewController alloc] init]; [myWindow addSubview:viewController.view]; [viewController release]; As I understand, myWindow should be retaining viewController.view for as long as the window needs it. So why does this cause my app to crash on launch? (commenting out the last line fixes the problem, as expected)

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• UITableView in popover doesn't stop scrolling

  - by igul222

  I have a UITableView being shown in a popover. One cell in my table view has a UITextField in it. When the text field is being edited (the keyboard is visible) and I rotate the device from portrait to landscape and then try to scroll the table view, it keeps going past its bounds, instead of stopping and "bouncing". Does anyone know how to fix this?

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• C: do {...} while(0)?

  - by igul222

  I'm working on some C code filled with macros like this: #define SAFE_FREE(x) do { if ((x) != NULL) {free(x); x=NULL;} } while(0) Can anyone explain what this macro does, and why do {} while(0) is needed? Wouldn't that just execute the code once?

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• Using Ruby/Python code in an iPhone OS app?

  - by igul222

  My app needs to use a library which is only available for Python and Ruby. From my understanding, Apple allows Ruby to run on iPhone as long as users can't execute arbitrary code (Rhomobile uses Ruby). How can I bundle Ruby/Python with my app, call a function from my Obj-C code, and get the result (a string) back in C or Obj-C format?

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• Number of occurrences of a substring in an NSString?

  - by igul222

  How can I get the number of times an NSString (for example, @"cake") appears in a larger NSString (for example, @"Cheesecake, apple cake, and cherry pie")? I need to do this on a lot of strings, so whatever method I use would need to be relatively fast. Thanks!

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• How to safely let users run arbitrary Ruby code?

  - by igul222

  I realize this sounds a little crazy, but I'm working on a project for which I need a server to run user-provided Ruby code and return the result. I'm looking to prevent something like this: system("rm -rf /") eval("something_evil") # etc... I'm sure there must be some reasonably safe way to do this, as it already exists at places like tryruby.org. Any help is greatly appreciated, thanks!

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• Swing: set JFrame content area size

  - by igul222

  I'm trying to make a JFrame with a usable content area of exactly 500x500. If I do this... public MyFrame() { super("Hello, world!"); setSize(500,500); } ... I get a window whose full size is 500x500, including the title bar, etc., where I really need a window whose size is something like 504x520 to account for the window border and titlebar. How can I achieve this?

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• C: difference between (int)x and floor(x)?

  - by igul222

  In C, what is the difference between these two? float myF = 5.6; printf( "%i \n", (int)myF ); // gives me "5" printf( "%ld \n", floor(myF) ); // also "5"? When is one preferable over the other?

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