Development Examples Vol.4 is an Objective-C learning pack. You just need to click on each square to download the example pill, unzip it, and open the Xcode project. The app provides you with nine learning courses, namely "Barcode Scanning", "Barometer", "Bluetooth", "Custom Segues", "Extensions", "Parallax", "Paypal integration", "Trigger vibration", and "VCF Card creation (Business card)".
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