iOS translucent automaticallyAdjustsScrollViewInsets edgesForExtendedLayout contentInsetAdjustmentBehavior

translucent

       self.navigationController.navigationBar.translucent = NO;

       ios7 之后iOS7之后由于navigationBar.translucent默认是YES，原点在（0，0）点

       当设置NO的时候，原点坐标在（0，64）点开始，屏幕会多一个导航栏的高度

automaticallyAdjustsScrollViewInsets

       self.automaticallyAdjustsScrollViewInsets = NO;

       self.edgesForExtendedLayout = UIRectEdgeNone;

contentInsetAdjustmentBehavior

iOS11中automaticallyAdjustsScrollViewInsets方法被废弃，我们需要使用UIScrollView的 contentInsetAdjustmentBehavior 属性来替代它.
我们先来看看contentInsetAdjustmentBehavior这个枚举值：

typedef NS_ENUM(NSInteger, UIScrollViewContentInsetAdjustmentBehavior) {
    UIScrollViewContentInsetAdjustmentAutomatic, 和scrollableAxes一样,scrollView会自动计算和适应顶部和底部的内边距并且在scrollView 不可滚动时,也会设置内边距.
    UIScrollViewContentInsetAdjustmentScrollableAxes, //自动计算内边距.
    UIScrollViewContentInsetAdjustmentNever, //不计算内边距，
    UIScrollViewContentInsetAdjustmentAlways, //根据safeAreaInsets 计算内边距
} API_AVAILABLE(ios(11.0),tvos(11.0));

self.navigationController.navigationBar.translucent = NO; 相当于self.automaticallyAdjustsScrollViewInsets = NO;self.edgesForExtendedLayout = UIRectEdgeNone;相当于 UIScrollViewContentInsetAdjustmentNever