var item:UINavigationItem =UINavigationItem();

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       var viewTitle =UIView();

            viewTitle.backgroundColor =UIColor.redColor();

            viewTitle.frame =CGRectMake(0,0,20,30)

        item.titleView = viewTitle;

       var button:UIBarButtonItem =UIBarButtonItem(title:"Left_1", style:UIBarButtonItemStyle.Done, target:nil, action:"aaa");

        var button2:UIBarButtonItem =UIBarButtonItem(title:"Left_2", style:UIBarButtonItemStyle.Done, target:nil, action:"aaa");

       var button3:UIBarButtonItem =UIBarButtonItem(title:"Right_1", style:UIBarButtonItemStyle.Done, target:nil, action:"aaa");

       var button4:UIBarButtonItem =UIBarButtonItem(title:"Right_2", style:UIBarButtonItemStyle.Done, target:nil, action:"aaa");

        item.leftBarButtonItems = [button,button2]

        item.rightBarButtonItems = [button3,button4]

       nav.pushNavigationItem(item, animated:true);