Mark Suman questions

Mark Suman answers

• Formatting floats in Objective C
• Detecting a change to text in UITextfield
• prefersLargeTitles doesn't work with programmatic layout
• Code signing identities not found in Xcode server
• xcode 6 object library is empty (no matches)
• iOS TabbarViewController hide the tab bar
• Format timer label to hours:minutes:seconds in Swift
• Error ITMS-4236 when uploading build to iTunes because of build version
• Xcode warning: "Multiple build commands for output file"