iOS 导航栏透明状态下UIScrollerView位置发生偏移

在设置了导航栏    [self.navigationController.navigationBar setTranslucent:YES];的情况下，如果添加了UIScrollerView,即使这时候设置了frame为（0，0，**，**）也会下移，空出导航栏的位置，原因是scrollerview下UIScrollViewContentInsetAdjustmentBehavior的属性使scrollerview发生了偏移：

/* Configure the behavior of adjustedContentInset.

 Default is UIScrollViewContentInsetAdjustmentAutomatic.

 */

@property(nonatomic)UIScrollViewContentInsetAdjustmentBehaviorcontentInsetAdjustmentBehaviorAPI_AVAILABLE(ios(11.0),tvos(11.0));

默认的属性为 UIScrollViewContentInsetAdjustmentAutomatic

点击进入之后可以看到：

typedefNS_ENUM(NSInteger, UIScrollViewContentInsetAdjustmentBehavior) {

    UIScrollViewContentInsetAdjustmentAutomatic,// Similar to .scrollableAxes, but for backward compatibility will also adjust the top & bottom contentInset when the scroll view is owned by a view controller with automaticallyAdjustsScrollViewInsets = YES inside a navigation controller, regardless of whether the scroll view is scrollable

    UIScrollViewContentInsetAdjustmentScrollableAxes,// Edges for scrollable axes are adjusted (i.e., contentSize.width/height > frame.size.width/height or alwaysBounceHorizontal/Vertical = YES)

    UIScrollViewContentInsetAdjustmentNever,// contentInset is not adjusted

    UIScrollViewContentInsetAdjustmentAlways,// contentInset is always adjusted by the scroll view's safeAreaInsets

}API_AVAILABLE(ios(11.0),tvos(11.0))

那么问题也就简单了，我们只需要设置我们的UIScrollView的    scrollView.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever;就可以解决偏移的问题了：