I'm new to iOS and, Objective-C and the whole MVC paradigm and I'm stuck with the following: I have a view that acts as a data entry form and I want to give the user the option to select multiple pro...
What does this mean? "'NSUnknownKeyException', reason: … this class is not key value coding-compliant for the key X"
I'm trying to link a UILabel with an IBOutlet created in my class. My application is crashing with the following error. What does this mean? How can I fix it? *** Terminating app due to uncaught ...
How do you use Auto Layout within UITableViewCells in a table view to let each cell's content and subviews determine the row height (itself/automatically), while maintaining smooth scrolling performan...
iOS 6 and Xcode 4.5 has a new feature referred to as "Unwind Segue": Unwind segues can allow transitioning to existing instances of scenes in a storyboard In addition to this brief entry in Xcod...
With the iPhone SDK: I have a UIView with UITextFields that brings up a keyboard. I need it to be able to: Allow scrolling of the contents of the UIScrollView to see the other text fields once the...
I would like to check to see if I have an Internet connection on iOS using the Cocoa Touch libraries or on OSX using the Cocoa libraries. I came up with a way to do this using an NSURL. The way I did...
What setting do I need to put in my info.plist to enable HTTP mode as per the following error message? Transport security has blocked a cleartext HTTP (http://) resource load since it is insecur...
What I want to do seems pretty simple, but I can't find any answers on the web. I have an NSMutableArray of objects, let's say they are 'Person' objects. I want to sort the NSMutableArray by Person.bi...
I know how delegates work, and I know how I can use them. But how do I create them?
Speed up fetching posts for my social network app by using query instead of observing a single event repeatedly
I have an array of keys which lead to post objects for my social network like so /posts/id/(post info) When I load the posts I load /posts/0 and then /posts/1 etc using the observeSingleEventOfType(...