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var item:UINavigationItem = UINavigationItem();
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);
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