modernize some of the code, correct all warnings, support macOS 10.9

MiMo42 / MMTabBarView

A Mac OS X tab bar view that works on 10.9+ with Xcode 9.3+. Pull requests welcomed.

http://mimo42.github.com/MMTabBarView/

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modernize some of the code, correct all warnings, support macOS 10.9 #65

Closed nivekkagicom closed 5 years ago

nivekkagicom commented 5 years ago

This change modernizes some of the code to use Objective-C 2.0 style. This change also turns on most warnings and corrects a number of nullability warnings. Lastly this change properly checks APIs before using them on older releases and supports back to macOS 10.9.