Swift-解决NavigationBar遮挡住view内容的问题
edgesForExtendedLayout
The extended edges to use for the layout.
automaticallyAdjustsScrollViewInsets
A Boolean value that indicates whether the view controller should automatically adjust its scroll view insets.
extendedLayoutIncludesOpaqueBars
A Boolean value indicating whether or not the extended layout includes opaque bars.
代码示例：
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
//解决 NavigationBar 挡住 view 内容的问题
//将edgesForExtendedLayout设置成UIRectEdgeNone,表明View是不要扩展到整个屏幕的
self.edgesForExtendedLayout = UIRectEdge.None
//打印查看:automaticallyAdjustsScrollViewInsets默认为true
//print(self.automaticallyAdjustsScrollViewInsets.boolValue)
//self.automaticallyAdjustsScrollViewInsets
... ...
}
参考：
http://www.cocoachina.com/bbs/read.php?tid=153502
http://www.cocoachina.com/bbs/read.php?tid-195157-page-e-fpage-705.html
http://my.oschina.net/u/2407613/blog/509280
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