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• Dismissing the keyboard in a UIScrollView

  - by Nicholas1024

  Alright, I have a couple of UITextFields and UITextViews inside a UIScrollView, and I'd like to set the keyboard to disappear whenever the scrollview is touched or scrolled (except when you touch down inside the text field/view, of course). My current attempt at doing this is replacing the UIScrollView with a subclass, and setting it to call a removeKeyboard function (defined inside the main view controller) inside the touchesBegan method. However, this only removes the keyboard for a normal touch, not when the view is simply scrolled. So, what's the best way to remove the keyboard inside a UIScrollView? Thanks in advance for your help.

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• How does one access subviews and handle groups of them?

  - by david

  If I want to manipulate a view I get it with [self viewWithTag:5];. Is there a better way to do this? Sometimes I need to manipulate a bunch of view (e.g. move them all out of the way. I do this by adding a UIView (e.g. UIView iHoldViews) and then adding the views, buttons, etc to this view. Then I can move the iHoldViews view and all its subviews move with it. Is there a better way to do this? (I have a feeling there is :) Maybe storing them in a NSArray or NSMutableDictionary ?

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• Include Obj-C++ header from C++ source file

  - by Schwitzgabel

  Consider the followng situation: MacFont.h struct MacFont : Font { // ... NSFont* font; }; MacFont will be implemented in MacFont.mm FontEngine.cpp: #if defined(OS_MAC) #include "MacFont.h" #elif // ... #endif //... In order to make it compiling, I should rename FontEngine.cpp to FontEngine.mm but I'm not allowed to. So what now?

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• Clear trailing 0's on a double?

  - by tarnfeld

  I have a double integer thats got a value of something like 0.50000 but I just want 0.5 - Is there any way to get rid of those trailing 0's? :)

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• How To Create a lookup Table with an NSDate for weekly range (over 5 year period)

  - by EarlyMan

  Unsure how to best achieve this. NSDate *date = [NSDate date]; I need to do a lookup on the date and return a string value. 12/17/2011 < date < 12/23/2011 return "20120101" 12/24/2011 < date < 12/30/2012 return "20120102" 12/31/2011 < date < 01/06/2012 return "20120201" ... 10/20/2012 < date < 10/26/2012 return "20122301" ... 11/02/2013 < date < 11/08/2013 return "20132301" .. for 5 years... for each week date can be any date until Dec. 2017. I do not know the logic behind the return strings so I can't simply calculate the string based on the date. The return string (converted to NSDate in the model) is used successfully as my section for my fetchedresultscontroller. I am not sure how to create a lookup table based on an NSDate or if I need some monster if/case statement.

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• Are the iPhone media playback control window available to other applications?

  - by Comma

  what is the transparent modal window that has the playback controls in the music player (iPod) of the iPhone? how can i use it in my app?

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• Typecasting doesn't work. How to convert an object?

  - by Nastase Ion

  Hi everyone! I need to convert a custom object to a different object. How can I do that? I know that typecasting doesn't work (the only thing is does is "shuts the compiler warnings off", but nothing more). Here is a sample code: MyType* obj1; MyOtherType* obj2; obj1 = [MyType initWithData: 1]; obj2 = (MyOtherType*) obj1; if ([obj2 isMemberOfClass: [MyOtherType class]]) { NSLog(@"OK"); } else if ([obj2 isMemberOfClass: [MyType class]]) { NSLog(@"Nope"); } The result is: Nope What can I do??

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• Difference b/n release and release then set to nil.

  - by user338111

  what is the difference between two snippets? [myObj release]; and [myObj release]; myObj = nil;

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• Memory consumed by an object during its lifetime

  - by makboney

  How can i trace memory consumed by an object in its life time when i am testing my application on device? [e.g.: without any instruments if possible]

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• How to set iPhone tab bar icon in code?

  - by Mark Struzinski

  I am using the same ViewController for several different views. When instantiating the ViewController for a specific view, is there an easy way to specify the tab bar icon via code?

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• How to create a NSPredicate to find entries with leading numerical value?

  - by Toastor

  Hello, I'm using NSPredicates to fetch entities based on a name attribute. Creating a predicate for names beginning with letters was easy (@"name BEGINSWITH %@", searchLetter), however now I'd like to fetch all entities with a name that begins with a numerical value, or rather a non-alphabetical number. What would be the appropriate predicate expression here? Right now I don't want to get too deep into predicate programming, as this is all I need right now and time flies. So, please, don't point me to the Predicate Programming Guide, I just need that expression.. :) Thanks alot guys!

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• How to check if a variable is an object?

  - by Patrick

  Is there any way to do the following at compile-time? int anInteger = 0; __if_object(anInteger) { // send object some messages } __if_primitive(anInteger) { // do something else } An dummy situation where this could be used is to define the __add_macro below. #define __add_macro(var, val) __something_goes_here__ int i = 1; MyInteger* num = [[MyNumber alloc] initWithValue:1] __add_macro(i, 4); __add_macro(num, 4); // both should now hold 5 Thanks

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• UIAlertView popups lock up keyboard actions

  - by TurbZ

  I have a strange behavior where if a UIAlert fires (like the one below) all subsequent keyboard or press behaviors are disabled / non responsive. Scrolling the screen still works but no action is fired from any button or keyboard presses. [[[[UIAlertView alloc] initWithTitle:@"Invalid Address" message:@"The email address you entered isn't valid. Please check and try again." delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil] autorelease] show]; Anyone experienced this behavior before and can shed some light? Or maybe guide me in the right direction to debug it further to get to the root cause? Thank you heaps!

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• When to define your ivars as pointers?

  - by eco_bach

  Can someone explain to me when it is necessary to define your ivars as pointers? I've seen many code samples that don't use pointers, while others do.

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• How do I add animation to an iPhone app?

  - by james p

  So I came from a Flash background where I can animate in timeline. I've completed the Beginning iPhone Development book and just realized that I still don't know how to get an animation in. I'm guessing I need to import png sequences? Can anyone point me to an appropriate place to learn more about this topic? I want to make a game and my game objects need to animate. Thanks in advance!!

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• Animation in a table view cell

  - by theomen

  I'm not sure if it is possible to achieve, but my costumer wants that when user taps a table view cell, an animation of a UIView sliding from left to right is committed, leaving the content under the UIView visible. My concern is about how to trigger gesture recognizer added to the upper UIVIew for the animation and do not enter in conflict with didSelectRowatIndex: table view delegate method. Is it possible to achieve? Mant thanks!

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• class NSCFData autoreleased with no pool in place

  - by iSight

  Hi, I have converted my NSString into string, and returning the same but the above error mentioned in the title is printing on console. Please suggest so that i could get away from this issue. my code is below: string stringFromNSString(NSString *inNSString) { return [inNSString UTF8String]; }

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• Validate NSString

  - by Chris

  I am validating an NSString to ensure that the string does not contain apostrophes. The code I'm using to do this is NSCharacterSet * invalidNumberSet = [NSCharacterSet characterSetWithCharactersInString:@"'"]; NSScanner * scanner = [NSScanner scannerWithString:string]; NSString * scannerResult; [scanner setCharactersToBeSkipped:nil]; [scanner scanUpToCharactersFromSet:invalidNumberSet intoString:&scannerResult]; if(![string isEqualToString:scannerResult]) { return 2; } Returning 2 represents an error. This code works, except for the case where the string is an apostrophe. To get around this issue, I added the following code above the preceding block. if([string isEqualToString:@"'"]); { return 2; } This code is evaluating to true, regardless of the input. I need to either prevent the first block from crashing with the input of ', or get the second block to work. What am I missing?

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• require user to login in at login screen before giving access to iPhone app that accesses secure web

  - by MikeN

  On iPhone, how do I show a login screen to get username and password before giving access to iPhone app? Also, does the iPhone store a cookie to the secure website like a web browser? I was thinking of giving users to my website a long API key to store in the settings of their iPhone instead of asking them to login with a username/password (seems to be the Slicehost iPhone app approach.) Which is the best way to get a user to login securely? I have full control over the design of the iPhone app and website so have a lot of flexibility.

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• Are UIView's in TableViewCells cause for performance problems?

  - by iFloh

  Hi, I have a UITableView of UITableViewCells that so far performed well. I now aded a simple UIView to my UITableViewCell as a color indicator (backgroundColor only, no other content or attributes). Running the tableview again I realise scrolling is not as smooth as it used to be. The tableView suddenly also takes long time (~1+ secs) to come back again when returning from a subview (e.g. return from the view that gets pushed upon selection of a cell). Any ideas why the added UIView would be problematic? Why are the labels (being a subclass of UIView) not cause for similar issues?

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• Question About Classic MVC

  - by kernix

  Hello, In classic MVC the model notifies the view about changes made on it. In C# this means I have to subclass the View I'm interested in and in the subclassed class register to the model's event. For example, if I were to implement MVC using C# and Winforms, I had to subclass TextBox class and then register inside the MyTextBox's constructor for the model events. Am I correct? How was this issued in Smalltalk? Does one also need to subclass every View in order to register the model's events, or is there some way to dynamically add events to the views on the fly? Thanks

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• How to step inside NSManagedObject; access individual attributes.

  - by user300972

  NSManagedObject *entryObj = [self.fetchedResultsController objectAtIndexPath:indexPath]; entryObj consists of four String attributes. If I NSLog entryObj, I get the information I want. I cannot figure out how to access each of these properties individually. I read a similar post where the solution was to call "entity." I cannot figure out how to use "entity" to access a specific attribute. Any ideas? References? Tutorials? Thanks in advance.

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• Search within HTML files

  - by SKk

  Hi Forum, In my iPhone project,I have number of HTML files having different textual and image contents within each file. I need to implement search facility which would return results (HTML file names) having matched keyword. Can anybody have any clue, how can I achieve this? Thanks

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• My application crashes on device

  - by Fazalyazdan

  hi i am new to iphone development and currently i am working on client server applications but the application run and work good on simulator but when i try it on device then the application crash after some times .Now i dont know why this will happend because i release every object which are decalre with alloc or init.but still crash on device . My application are like (Rate My puppy application)which are store on apple store . please help me if any one have the solutions .

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• Shedule tasks question

  - by gabac

  Hi everyone I have a though question :) Let's say you get some data which is due at a certain point int the future. You get A saying my task is due in 1h and other which says his task is due in 1.5h. The information is collected on your server. In which programming language or even how would solve that? So task a will be executed in 1h, task B in 1.5h. I read something about java scheduler but I'm not yet sure if this is the right way. What are ur ideas? Cheers

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