ios11透明导航栏

Question

创建透明导航栏不再适用于 ios11。我在顶部得到了这个黑条，因为 table 视图不再位于条下方（情节提要中的插图已正确设置为从 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

我遇到了类似的问题。我在故事板中为 UIViewController 设置了 "Extended Edges: Under Top/Bottom/Opaque Bar" true。 Like this. 您也可以尝试禁用“Automatically Adjusts Scroll View Insets”

Answer 2

旧：

如果你用过tableView，添加代码：

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

新：

在 iOS11 中更改了 automaticallyAdjustsScrollViewInsets:

@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));

可能是 iOS11 的安全区域问题。试试这个来自一位专家的定义：

#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 3

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，我发现仍然有必要让它发挥作用。很可能您的 UICollectionView/UITableView/UIScrollview 与安全区域的顶部对齐。改为将此约束更改为与超级视图的顶部对齐。

就是这样。是不是直截了当又直观？谢谢苹果。

Answer 4

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

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

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

ios11透明导航栏

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