Warning: Attempt to present … on … while a presentation is in progress!
There is a warning message in Xcode, the Apple iOS development environment that can have many different causes. Warning: Attempt to present … on … while a presentation is in progress! In my case Xcode displayed the warning because a button…
Xcode app development troubleshooting
This post is a collection of common error messages you may receive during application development in Xcode. Error message Receiver ‘NSManagedObjectContext’ for class message is a forward declaration Solution Add #import…
Save an image in the Xcode iPhone simulator
When you are testing an app in the Xcode iOS Simulator sometimes you need to select an image in the photo library. To add images to Photos in the Xcode iOS Simulator Run you app in the iOS iPhone Simulator In the Hardware menu select Home to hide your…
Extend the iPhone view in Xcode
When you design an iPhone, iPad view in the Xcode Builder and place a Scroll View on the View Controller you can make the page larger than the physical size of the screen of the device. To see the whole view set the size of the View. Open the Story Board…
Apple Objective-C programming fundamentals. Working with Data, Part 2, Create the data model
In this part of the series we will continue the development of our data store app that we set up in the first part of the series. Create the Data Model Open your sample application that you created in the first part Open the Project Navigator Select the…
Apple Objective-C programming fundamentals. Working with Data, Part 1, The App
This article will guide you to create an app that stores data on the user’s device. To create our sample app to store data on the user’s device Start Xcode, the Apple IDE for IOS development Create a new project Open the AppDelegate.h file…
Apple Objective-C programming fundamentals. Working with Dates
When you need to display date and time on your app’s screen you need an easy way to convert NSDate objects to NSString objects. Objective-C contains methods to do the conversion, but the syntax is not simple. It is much easier to create a method…
Apple Objective-C programming fundamentals. Creating Segues in the Storyboard
Segue types Segues are connections between views, so one view can call the other when the user pushes a button, or any specific object. The Modal Segue When the two views do not need to share information, like a login screen The Push Segue The push segue…
Apple Objective-C programming fundamentals – Part 1 – The language.
To write an application for an Apple device (iPhone, iPod, iPadn, Macintosh) Apple recommends the Ojbective-C language. Xcode, the Apple development environment (IDE) supports the usage of Objective-C. This article summarizes the basics of Objective-C…
Using the Apple Xcode development environment
View two files side-by-side Open the Project Navigator Click the first file in the Navigator Option-Click the second file in the Navigator The two files are displayed next to each other, so you can compare them and copy code between them. Using tabs In…