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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);