swift解决ipad上tabbar文字显示在右边问题

    // MARK: 解决ipad上tabbar文字显示在右边问题
    override open var traitCollection: UITraitCollection {
        let oldTrait = super.traitCollection
          if UIDevice.current.userInterfaceIdiom == .pad {
              let tmpTrait = UITraitCollection(horizontalSizeClass: .compact)
              let newTrait = UITraitCollection.init(traitsFrom: [oldTrait,tmpTrait])
              return newTrait
          }
          return super.traitCollection
      }
}