IT Nursery
For the most part with ARC (Automatic Reference Counting), we don’t need to think about memory management at all with Objective-C objects. It is not permitted to create NSAutoreleasePools...
An Xcode beginner’s question: It is my first experience with Xcode 4.6.3. I am trying to write a very simple console program, that searches for paired BT devices and...
I am creating an app which will have a question in a UILabel and a multiple choice answers displayed in UITableView, each row showing a multiple choice. Questions and...
This question already has answers here: Closed 9 years ago. Possible Duplicate: Best practices for validating email address in Objective-C on iOS 2.0? I am developing an iPhone application...
When using GCD, we want to wait until two async blocks are executed and done before moving on to the next steps of execution. What is the best way...
I currently have a UILabel: factLabel = [[UILabel alloc] initWithFrame:CGRectMake(20, 100, 280, 100)]; factLabel.text = @"some text some text some text some text"; factLabel.backgroundColor = [UIColor clearColor]; factLabel.lineBreakMode =...
I am using MKMapView and have added a number of annotation pins to the map about a 5-10 kilometre area. When I run the application my map starts zoomed...
I have an iOS project using CocoaPods. Everything was working smoothly until another developer started to work on the same project. He made some changes (only to code as...
I have a common UIViewController that all my UIViewsControllers extend to reuse some common operations. I want to set up a segue on this “Common” UIViewController so that all...
Does @synchronized not use “lock” and “unlock” to achieve mutual exclusion? How does it do lock/unlock then? The output of the following program is only “Hello World”. @interface MyLock:...