Through Interface Builder I have the ability to change the Identifier of a UIBarButtonItem to something like "Add" (or "Undo", "Redo" etc...). This gives my button a nice "+" image. How can I set this programatically? The UIBarButtonItem does not accept a "setIdentifier" message. ...
How would I say that if a UITextField has @"-" in it, do something. Right now my code is like this. It doesn't seem to work: if (MyUITextField.text == @"-") { NSRange range = {0,1}; [a deleteCharactersInRange:range]; MyUITextField.text = MyUILabel.text; } I know that I am doing something very wrong with the code. Please he...
The following code: [[NSData alloc]initWithContentsOfURL:[NSURL URLWithString:mapURL]] returns an instance of NSConcreteData as opposed to NSData (which I expected!). What does NSConcreteData represent, exactly, and why is it being returned instead of an instance of NSData? Further, where is this class defined? XCode is complaining th...
- (UIView *)tableView:(UITableView *)tableView viewForFooterInSection:(NSInteger)section { AViewController * aView = [[AViewController alloc] initWithNibName:@"myNib" bundle:[NSBundle mainBundle]]; return vintagePriceRowView.view; } I know this code needs a release... somewhere. But where? If I set the allocated AviewContro...
See the log statement comments at the end of the code snippet... acceleration.x is a decimal, but when I store it to the dict, it seems to be 0. NSDictionary *entry = [NSDictionary dictionaryWithObjectsAndKeys: [NSNumber numberWithDouble:acceleration.x], @"x", [NSNumber numberWithDouble:acceleration.y], @"y", [NSNumber numberWithD...
I have created aand sent a short email with a .txt attachment in an iPhone app. If the attachment is about 10 lines long, GMail opens it just fine. If it's more than 20 or so lines, GMail chokes - it won't open the attachment, download the attachment, or even forward the email. Also, if I send the same email to my colleague and he ope...
I have a controller that contains a tableView that spawns another controller modally to enter a name in. Once the name is entered the modalview is released. But... how do I tell the first controller to [tableView reloadData]. I have tried in the ViewWillAppear, ViewDidAppear, etc... none of them will fire off the command because the firs...
(Nearly solved, but not quite) (My temporary solution is to use a void method and call it in every button, and in that way I can edit the code used by multiple buttons rather then when making improvements having to edit each individual buttons if statement) I bet it's a really simple error i've made, but I can't find it. I'm trying to ...
I'm new to programming for the iPhone and i'm wondering: how extensible are the various controls? Let's take the button as an example: can i change the background graphic? can i make it grow larger when i press on it? can i change the font? can i use a custom font? can i use a button graphic in place of text? ...
If you change an anything (entity, relationship, type of attribute etc) in a CoreData model after it has shipped, what is the general process that you have to go through to get the user's store updated for your new model. ...
I want to be able to determine if the number of bytes in an instance of NSMutableData is equal to zero. How would I do this? ...
I have a UIButton and I am trying to set a title and an image on it. I would like to align the title for a UIButton to the left side and place an image aligned to the right. I am trying to get the look and feel of the button in Timer in Clocks app (the one which says "When Timer Ends"). I fiddled with contentHorizontalAlignment, conten...
This is a fun one... I have an application that has a help screen and is displayed as a modal view. The main view has an action that occurs when the device is shaken. I do not want the action to occur (sounds are played) when the help screen has been displayed. I have tried a few things... here is my code: To display the help screen...
I display a UITextView that I want the user to be able to copy from but not edit. There must be no keyboard present on the screen during the copy. If I prevent first responder then the keyboard stays hidden. However this also prevents processing of events from touches that would allow a copy interaction. It also has to be editable to pr...
On the iPhone: Using the US locale, a currency looks like this: $1,234.56 Using the UK locale, a currency looks like this: £1,234.56 Using the German (Germany) locale, a currency looks like this: 1.234,56 € and finally, a Japanese currency: ¥1,234 The Japanese currency has no decimals and this impacts my custom keyboard significantl...
I'm building a GPS recorder app for the iPhone, and I was wondering if anyone could say why I might use the data persistence API, instead of writing data to flat files? ...
I have a tableView that I want to allow editing and delete rows. I make it go into editing mode fine. But when I press the delete button it's not firing off the event to make it delete the row!?? Here is my code: - (IBAction)editTable:(id)sender{ ; if(self.editing){ [super setEditing:NO animated:NO]; [self.tableView setEditing:NO an...
What am I doing wrong here: NSArray *paths = NSSearchPathForDirectoriesInDomains (NSDocumentDirectory, NSUserDomainMask, YES); NSString *documentsDirectory = [paths objectAtIndex:0]; self.gpsFilePath = [documentsDirectory stringByAppendingString: @"/gpsReadings.txt"]; self.gpsFile = [NSFileHandle fileHandleForWritingAtPath:self.gpsFile...
I would like to tint an image with a color reference. The results should look like the Multiply blending mode in Photoshop, where whites would be replaced with tint: I will be changing the color value continuously. Follow up: I would put the code to do this in my ImageView's drawRect: method, right? As always, a code snippet would g...
There are currently a lot of answers on how to set a custom fixed background for a UITableView. But is there any trick to make the background image scroll together with the table cells? Thanks! ...