nsnotifications

I am trying to use a customized keyboard in my application, but I am hitting problems when trying to restrict it to one particular UITextField. I based my code on this Xcode project (originally found on this blog ). That code adds a custom UIButton (representing a 'decimal point') into the UIKeyboardTypeNumberPad keyboard view. It does it by subscribing to UIKeyboardWillShowNotification and modifying the keyboard when it appears. That Xcode project works great, but when I add an extra UITextField, the custom key gets put into the keyboard for that text field too, even though I have selected a

I simply need to have a notification post when a valid IP address is assigned. I have tried polling via SCReachability, but that seems to be inefficient. Any suggestions? This seems like it should be simple, but I've been struggling for several hours to get anything working. I know this is a bit old but the selected answer is not ideal. The SCReachability API can be used to know when a particular host is reachable. If all you want to know is when a valid IP address is assigned (rather than a viable route to a target IP) then you should look at the SCDynamicStore* APIs instead. These functions

I am in the middle of solving a problem which requires me to do the following in my 64-bit Cocoa application: Spawn a 32-bit Cocoa helper tool (command line tool) from within my application. This helper will open a file (a quicktime movie to be precise) and access information about that file using 32-bit only APIs (Quicktime-C APIs) The data gathered from the 32-bit process needs to be passed back to the 64-bit application. The 64-bit app should wait until the 32-bit process completes before continuing There are many ways to accomplish this in Cocoa, but from what I gather these are two

I am using the following NSNotifications within a UIView so that the view can be notified when a UIKeyboard appears and adjust its position (frame) on screen: [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil]; [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardDidShow:) name:UIKeyboardDidShowNotification object:nil]; The two notifications above are being subscribed to within the -init method of the UIView. Where is the best place to unsubscribe from these notifications once

So, I am just testing NSNotifications on a variety of cases and this one is confusing. I would appreciate it if you could help me understand NSNotifications ! I have a Navigation Controller. I have a UIBarButtonItem called "Add", which posts notification DidAddNotification If I click Add it pushes me to view2. // I add view2 as observer and write method for this and NSlog if it gets implemented // I again push myself to view 3. // I add view3 as another observer and use the same method as the previous view and I NSlog if it gets implemented// From View 3, I popToRootViewControllerAnimated:YES