【背景】
参考：
MHTabBarController/MHTabBarController.m at master · hollance/MHTabBarController · GitHub
尝试把OC代码改为swift代码，借鉴的去实现自己的自定义的tab，结果代码：
class RecordTabBarController : UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
self.view.autoresizingMask = UIViewAutoresizing.FlexibleWidth | UIViewAutoresizing.FlexibleHeight出错：
RecordTabBarController.swift:17:71: Binary operator ‘|’ cannot be applied to two ‘UIViewAutoresizing’ operands
【解决过程】
1.搜：
swift Binary operator | cannot be applied to two UIViewAutoresizing operands
参考：
ios – Binary operator ‘|’ cannot be applied to two UIViewAutoresizing operands – Stack Overflow
去改为：
self.view.autoresizingMask = [UIViewAutoresizing.FlexibleWidth, UIViewAutoresizing.FlexibleHeight]
即可。
【总结】
swift新语法，把：
self.view.autoresizingMask = UIViewAutoresizing.FlexibleWidth | UIViewAutoresizing.FlexibleHeight
换成：
self.view.autoresizingMask = [UIViewAutoresizing.FlexibleWidth, UIViewAutoresizing.FlexibleHeight]
才可以。
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