jxdwinter questions

• UIButton addTarget does not work
• Xcode5.1.1 and Xcode6 beta7 iOS7.1 64-bit [Allocator] Allocator invalid, falling back to malloc
• UIAlertViewDelegate:clickedButtonAtIndex and two buttons
• Custom UITableViewCell NSUnknownKeyException
• UIView addSubview and the subview isn't displayed
• UIImageView content mode
• iOS app applicationWillEnterForeground and it stuck for a while
• How to use thousand separator in NSString
• UITabBar will hide the last cell of the UITableView
• iOS TabbarViewController hide the tab bar

jxdwinter answers