edgesForExtendedLayout和automaticallyAdjustsScrollViewInsets
2017-05-22 14:34
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1、edgesForExtendedLayout
UIRectEdge edgesForExtendedLayout NS_AVAILABLE_IOS(7_0); // Defaults to UIRectEdgeAll typedef NS_OPTIONS(NSUInteger, UIRectEdge) { UIRectEdgeNone = 0, UIRectEdgeTop = 1 << 0, UIRectEdgeLeft = 1 << 1, UIRectEdgeBottom = 1 << 2, UIRectEdgeRight = 1 << 3, UIRectEdgeAll = UIRectEdgeTop | UIRectEdgeLeft | UIRectEdgeBottom | UIRectEdgeRight }
edgesForExtendedLayout指定边缘要延伸的方向,默认是UIRectEdgeAll,四周边缘全部延伸,就是说,如果即使视图中上有navigationBar,下有tabBar,那么视图仍会延伸覆盖到四周的区域。(有留心的小伙伴会看到它们的底部有类似磨砂的效果)
这是在IOS7以后 ViewController 开始使用全屏布局的,坐标原点从左上角开始。
为了不让tableView 不延伸到 navigationBar 下面, 属性设置为 UIRectEdgeNone
这时会发现导航栏变灰了,处理如下就OK了
self.navigationController.navigationBar.translucent = NO;
那 automaticallyAdjustsScrollViewInsets 呢?
2、automaticallyAdjustsScrollViewInsets
当 automaticallyAdjustsScrollViewInsets 为 NO 时,tableview 是从屏幕的最上边开始,也就是被导航栏 & 状态栏覆盖当 automaticallyAdjustsScrollViewInsets 为 YES 时,也是默认行为,表现就比较正常了,
。automaticallyAdjustsScrollViewInsets是一个bool类型,默认为YES,也就是会自动校准滚动视图的嵌入视图。不过这个只针对于UIScrollView及其子视图
但是,测试结果很软肋,基本区别不大。。。但是对于解决一些Bug 是还是起作用的,比如说SearchBar的跳动问题,详情见:http://www.cnblogs.com/skyming/p/4059128.html, 其他UITableView,UIScrollView 位置的
问题多数和这3属性相关。。
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