Gavin questions

Gavin answers

• Determine if the device is ARM64
• How to use [performSelector: onThread: withObject: waitUntilDone:]?
• CAGradientLayer with CAShapeLayer mask not showing
• Different design for two targets in storyboard
• UIWebView prevents UITableView to scroll
• iOS 7 change UITableViewCell font color to blue like in Settings app
• how to call @selector method from another class
• Why use copy for block properties? [duplicate]
• addObject in NSMutableArray is copied or retained?
• iOS error "Initializing 'NSTimeInterval *' (aka 'double *')