swift如何同时设置多个枚举值，有两种方式
1.通过rawValue方法赋值
self.tableView.autoresizingMask = UIViewAutoresizing(rawValue: UIViewAutoresizing.flexibleHeight.rawValue | UIViewAutoresizing.flexibleWidth.rawValue)
2.通过中括号的形式赋值
self.tableView.autoresizingMask = [.flexibleWidth,.flexibleHeight]
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