我遵循这个线程重写-preferredStatusBarStyle,但它没有被调用。 有什么选项我可以改变来启用它吗?(我在我的项目中使用xib。)
当前回答
大多数答案都不包括UINavigationController的childViewControllerForStatusBarStyle方法的良好实现。根据我的经验,你应该处理这样的情况,当透明的视图控制器在导航控制器。在这些情况下,你应该把控制传递给你的模态控制器(visibleViewController),但不要在它消失的时候。
override var childViewControllerForStatusBarStyle: UIViewController? {
var childViewController = visibleViewController
if let controller = childViewController, controller.isBeingDismissed {
childViewController = topViewController
}
return childViewController?.childViewControllerForStatusBarStyle ?? childViewController
}
其他回答
所以我实际上添加了一个category到UINavigationController,但是使用了这些方法:
-(UIViewController *)childViewControllerForStatusBarStyle;
-(UIViewController *)childViewControllerForStatusBarHidden;
让它们返回当前可见的UIViewController。这让当前可见视图控制器设置它自己的首选样式/可见性。
下面是它的完整代码片段:
迅速:
extension UINavigationController {
public override func childViewControllerForStatusBarHidden() -> UIViewController? {
return self.topViewController
}
public override func childViewControllerForStatusBarStyle() -> UIViewController? {
return self.topViewController
}
}
在objective - c中:
@interface UINavigationController (StatusBarStyle)
@end
@implementation UINavigationController (StatusBarStyle)
-(UIViewController *)childViewControllerForStatusBarStyle {
return self.topViewController;
}
-(UIViewController *)childViewControllerForStatusBarHidden {
return self.topViewController;
}
@end
为了更好地衡量,这是它如何在UIViewController中实现的:
在斯威夫特
override public func preferredStatusBarStyle() -> UIStatusBarStyle {
return .LightContent
}
override func prefersStatusBarHidden() -> Bool {
return false
}
在objective - c中
-(UIStatusBarStyle)preferredStatusBarStyle {
return UIStatusBarStyleLightContent; // your own style
}
- (BOOL)prefersStatusBarHidden {
return NO; // your own visibility code
}
最后,确保你的app plist没有将“基于视图控制器的状态栏外观”设置为NO。要么删除这一行,要么将其设置为YES(我相信这是iOS 7的默认设置?)
这是我解决这个问题的方法。
定义一个名为AGViewControllerAppearance的协议。
AGViewControllerAppearance.h
#import <Foundation/Foundation.h>
@protocol AGViewControllerAppearance <NSObject>
@optional
- (BOOL)showsStatusBar;
- (BOOL)animatesStatusBarVisibility;
- (UIStatusBarStyle)preferredStatusBarStyle;
- (UIStatusBarAnimation)prefferedStatusBarAnimation;
@end
在UIViewController上定义一个名为Upgrade的类别。
UIViewController+Upgrade.h
#import <UIKit/UIKit.h>
@interface UIViewController (Upgrade)
//
// Replacements
//
- (void)upgradedViewWillAppear:(BOOL)animated;
@end
UIViewController+Upgrade.m
#import "UIViewController+Upgrade.h"
#import <objc/runtime.h>
#import "AGViewControllerAppearance.h" // This is the appearance protocol
@implementation UIViewController (Upgrade)
+ (void)load
{
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wselector"
Method viewWillAppear = class_getInstanceMethod(self, @selector(viewWillAppear:));
#pragma clang diagnostic pop
Method upgradedViewWillAppear = class_getInstanceMethod(self, @selector(upgradedViewWillAppear:));
method_exchangeImplementations(viewWillAppear, upgradedViewWillAppear);
}
#pragma mark - Implementation
- (void)upgradedViewWillAppear:(BOOL)animated
{
//
// Call the original message (it may be a little confusing that we're
// calling the 'same' method, but we're actually calling the original one :) )
//
[self upgradedViewWillAppear:animated];
//
// Implementation
//
if ([self conformsToProtocol:@protocol(AGViewControllerAppearance)])
{
UIViewController <AGViewControllerAppearance> *viewControllerConformingToAppearance =
(UIViewController <AGViewControllerAppearance> *)self;
//
// Status bar
//
if ([viewControllerConformingToAppearance respondsToSelector:@selector(preferredStatusBarStyle)])
{
BOOL shouldAnimate = YES;
if ([viewControllerConformingToAppearance respondsToSelector:@selector(animatesStatusBarVisibility)])
{
shouldAnimate = [viewControllerConformingToAppearance animatesStatusBarVisibility];
}
[[UIApplication sharedApplication] setStatusBarStyle:[viewControllerConformingToAppearance preferredStatusBarStyle]
animated:shouldAnimate];
}
if ([viewControllerConformingToAppearance respondsToSelector:@selector(showsStatusBar)])
{
UIStatusBarAnimation animation = UIStatusBarAnimationSlide;
if ([viewControllerConformingToAppearance respondsToSelector:@selector(prefferedStatusBarAnimation)])
{
animation = [viewControllerConformingToAppearance prefferedStatusBarAnimation];
}
[[UIApplication sharedApplication] setStatusBarHidden:(! [viewControllerConformingToAppearance showsStatusBar])
withAnimation:animation];
}
}
}
@end
现在,是时候说你的视图控制器正在实现AGViewControllerAppearance协议。
例子:
@interface XYSampleViewController () <AGViewControllerAppearance>
... the rest of the interface
@end
当然,你可以实现其余的方法(showsStatusBar, animatesStatusBarVisibility, prefereredstatusbaranimation)从协议和UIViewController+升级将做适当的 基于它们提供的值进行定制。
在UINavigationController上,preferredStatusBarStyle不会被调用,因为它的topViewController优先于self。所以,要在UINavigationController上调用preferredStatusBarStyle,你需要改变它的childForStatusBarStyle (Swift) / childViewControllerForStatusBarStyle (ObjC)。
建议
重写你类中的UINavigationController:
class MyRootNavigationController: UINavigationController {
override var preferredStatusBarStyle: UIStatusBarStyle {
return .lightContent
}
override var childForStatusBarStyle: UIViewController? {
return nil
}
}
非推荐替代方案
要为所有UINavigationController做这件事,你可以在一个扩展中覆盖(警告:它会影响UIDocumentPickerViewController, UIImagePickerController等),但你可能不应该根据Swift文档这样做:
extension UINavigationController {
open override var preferredStatusBarStyle: UIStatusBarStyle {
return .lightContent
}
open override var childForStatusBarStyle: UIViewController? {
return nil
}
}
在Swift中,对于任何类型的UIViewController:
在你的AppDelegate集合中:
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
window!.rootViewController = myRootController
return true
}
myRootController可以是任何类型的UIViewController,例如UITabBarController或UINavigationController。
然后,像这样重写这个根控制器:
class RootController: UIViewController {
override func preferredStatusBarStyle() -> UIStatusBarStyle {
return .LightContent
}
}
这将改变状态栏在整个应用程序中的外观,因为根控制器只负责状态栏的外观。
记住在你的信息中将基于视图控制器的状态栏外观属性设置为YES。Plist使其工作(这是默认值)。
对于任何仍然与此斗争的人来说,这个简单的扩展在swift中应该为您解决这个问题。
extension UINavigationController {
override open var childForStatusBarStyle: UIViewController? {
return self.topViewController
}
}
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