导航栏状态栏通透ios11适配

状态栏通透.png

想要实现状态栏通透的效果：
iOS10及以下设备设置控制器

- (void)viewDidLoad {
    [super viewDidLoad];
    //  设置导航栏的背景图透明
    [self.navigationController.navigationBar setBackgroundImage:[UIImage new] forBarMetrics:UIBarMetricsDefault];
  //  设置导航栏底部线不显示
    [self.navigationController.navigationBar setShadowImage:[UIImage new]];
    self.automaticallyAdjustsScrollViewInsets = NO; // 9.0设备上
}

在ios11的设备上，可以设置UIScrollView的contentInsetAdjustmentBehavior的属性；

例如：设置tableView的contentInsetAdjustmentBehavior的属性

 if (@available(iOS 11.0, *)) {
            _tableView.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever;
        } else {
            // Fallback on earlier versions
        }

查看这个属性的相关信息得知，将要废除，并有新的属性替换

@property(nonatomic,assign) BOOL automaticallyAdjustsScrollViewInsets API_DEPRECATED_WITH_REPLACEMENT("Use UIScrollView's contentInsetAdjustmentBehavior instead", ios(7.0,11.0),tvos(7.0,11.0)); // Defaults to YES

因为控制器的automaticallyAdjustsScrollViewInsets默认是YES，也就是控制器的视图会自动适应导航栏和状态栏的缩进；反之不自动适应，则从屏幕顶部开始。

UIScrollViewContentInsetAdjustmentBehavior同理,设置UIScrollViewContentInsetAdjustmentNever则不自动适应，从屏幕顶部开始。

typedef NS_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));

导航栏通透.gif