Obj-C
Objective-C: Format Currency Strings from Double Values with NSNumberFormatter
Converting a decimal number to a currency string is simple with NSNumberFormatter.
iOS
Fix fileExistsAtPath Always Returning NO in iOS 8 Cache Directories
Generating the path dynamically with NSSearchPathForDirectoriesInDomains.
iOS
NSURL URLWithString vs fileURLWithPath: Loading Local Files Correctly in iOS
A frequent mistake when playing a local video using [AVAudioPlayer initWithContentsOfURL:url] is to use URLWithString instead of fileURLWithPath.
Xcode
Debug Auto Layout Constraints with Xcode 7’s Debug View Hierarchy
A small button named 'Debug view hierarchy', displays current view hierarchy in 3D.
