下面是一个使用样例，点击左侧加号会添加一个新的导航项，点击右侧Cancel会移除当前最上层导航项。
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@H_502_20@
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import
UIKit
class
ViewController
:
UIViewController
{
var
count = 0
//声明导航条
navigationBar:
UINavigationBar
?
override
func
viewDidLoad() {
super
.viewDidLoad()
// Do any additional setup after loading the view,typically from a nib.
//实例化导航条
navigationBar =
(frame:
CGRectMake
(0,320,44))
self
.view.addSubview(navigationBar!)
onAdd()
}
didReceiveMemoryWarning() {
.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
onAdd(){
count++
//给导航条增加导航项
navigationBar?.pushNavigationItem(onMakeNavitem(),animated:
true
)
}
onRemove(){
if
count > 1{
//减少导航项数量
count--
//从导航条中移除最后一个导航项
navigationBar?.popNavigationItemAnimated(
)
}
}
//创建一个导航项
onMakeNavitem()->
UINavigationItem
{
navigationItem =
()
//创建左边按钮
leftBtn =
UIBarButtonItem
(barButtonSystemItem:
UIBarButtonSystemItem
.
Add
,
target:
"onAdd"
)
//创建右边按钮
rightBtn =
Cancel
"onRemove"
)
//设置导航栏标题
navigationItem.title =
"第\(count)个导航项"
//设置导航项左边的按钮
navigationItem.setLeftBarButtonItem(leftBtn,monospace!important; min-height:inherit!important">)
//设置导航项右边的按钮
navigationItem.setRightBarButtonItem(rightBtn,monospace!important; min-height:inherit!important">)
return
navigationItem
}
}
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