ios 11透明导航栏

Question

创建透明导航栏不再适用于ios 11。 我把这个黑条放在顶部，因为桌面视图不再出现在条形图下面（故事板中的插图设置正确，从0开始） 有什么想法吗？

self.navigationController?.navigationBar.setBackgroundImage(UIImage(), for: UIBarMetrics.default)
self.navigationController?.navigationBar.shadowImage = UIImage()
self.navigationController?.navigationBar.isTranslucent = true

Answer 1

旧：

如果您使用过tableView，请添加代码：

if (@available(iOS 11.0, *)) {
    self.tableView.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever;
} else {
    self.automaticallyAdjustsScrollViewInsets = NO;
}

新：

iOS11中的automaticAdjustsScrollViewInsets的更改：

@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

关于contentInsetAdjustmentBehavior：

typedef NS_ENUM(NSInteger, UIScrollViewContentInsetAdjustmentBehavior) {
    UIScrollViewContentInsetAdjustmentAutomatic, // Similar to .scrollableAxes, but will also adjust the top & bottom contentInset when the scroll view is owned by a view controller with automaticallyAdjustsScrollViewContentInset = 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));

/* Configure the behavior of adjustedContentInset.
 Default is UIScrollViewContentInsetAdjustmentAutomatic.
 */
@property(nonatomic) UIScrollViewContentInsetAdjustmentBehavior contentInsetAdjustmentBehavior API_AVAILABLE(ios(11.0),tvos(11.0));

这可能是iOS11的safeArea问题。 从一位专家那里尝试这个定义：

#define  adjustsScrollViewInsets_NO(scrollView,vc)\
do { \
    _Pragma("clang diagnostic push") \
    _Pragma("clang diagnostic ignored \"-Warc-performSelector-leaks\"") \
        if ([UIScrollView instancesRespondToSelector:NSSelectorFromString(@"setContentInsetAdjustmentBehavior:")]) {\
            [scrollView   performSelector:NSSelectorFromString(@"setContentInsetAdjustmentBehavior:") withObject:@(2)];\
        } else {\
            vc.automaticallyAdjustsScrollViewInsets = NO;\
        }\
    _Pragma("clang diagnostic pop") \
} while (0)

Answer 2

我遇到了同样的问题，我能够解决它。 这对我有用：

public override func viewDidLoad() {
    super.viewDidLoad()

    self.navigationController?.navigationBar.backgroundColor = UIColor.clear
    self.navigationController?.navigationBar.isTranslucent = true
    if #available(iOS 11.0, *) {
        collectionView.contentInsetAdjustmentBehavior = .never
    } else {
        // Fallback on earlier versions
    }
}

还有一件事，我发现仍然需要让它发挥作用。最有可能的是，您将UICollectionView / UITableView / UIScrollview对齐到安全区域的顶部。将此约束更改为与超级视图的顶部对齐。

就是这样。这不是直截了当的直观吗？谢谢Apple。

Answer 3

我有一个类似的问题。我在故事板中为UIViewController设置了“Extended Edges：Under Top / Bottom / Opaque Bar”。 Like this. 您也可以尝试停用“Automatically Adjusts Scroll View Insets”

Answer 4

要在iOS 10和11之间保持一致的行为，请尝试将其添加到navigationViewController

func navigationController(_ navigationController: UINavigationController, willShow viewController: UIViewController, animated: Bool) {

    if navigationBar.isTranslucent, #available(iOS 11.0, *) {           
        viewController.additionalSafeAreaInsets.top = -navigationBar.bounds.height
    }
}