AutomaticallyAdjustsScrollViewIn

当我们在一个UIViewController中同时创建2个tableView的时候,如果把它们的frame中的Y坐标设置为一样,你可能会发现它们的位置并没有达到你想要的结果.比如第一tableView个frame(0,0,320,568),另一个也frame(0,0,320,568),结果会发现第二个tableView的第一行数据被导航栏遮挡了,以至于我们不得已把第二个frame改成(0,64,320,568-64),虽然效果变成了我们想要的,但是却不知道这是什么原因.......

其实这一切都是automaticallyAdjustsScrollViewInsets在作怪,我们可以先看一下官方文档中对它的描述:

automaticallyAdjustsScrollViewInsets

Specifies whether or not the view controller should automatically adjust its scroll view insets.

@property(nonatomic, assign) BOOL automaticallyAdjustsScrollViewInsets

Discussion

Default value is YES, which allows the view controller to adjust its scroll view insets in response to the screen areas consumed by the status bar, navigation bar, and toolbar or tab bar. Set toNO if you want to manage scroll view inset adjustments yourself, such as when there is more than one scroll view in the view hierarchy.

Availability

Available in iOS 7.0 and later.

Declared In

UIViewController.h

当我们一个界面有多个tableView之类的, 将它设置为NO,完全由自己手动来布局,就不会错乱了.