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
Tyson的答案是正确的改变状态栏颜色为白色在UINavigationController。
如果有人想通过在AppDelegate中编写代码来实现相同的结果,那么请使用下面的代码并在AppDelegate的didFinishLaunchingWithOptions方法中编写它。
不要忘记在。plist文件中设置UIViewControllerBasedStatusBarAppearance为YES,否则更改将不会反映。
Code
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
// status bar appearance code
[[UINavigationBar appearance] setBarStyle:UIBarStyleBlack];
return YES;
}
其他回答
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
}
}
如果有人在使用UISearchController时遇到这个问题。 只需要创建一个UISearchController的新子类,然后将下面的代码添加到这个类中:
override func preferredStatusBarStyle() -> UIStatusBarStyle {
return .LightContent
}
我的应用程序使用了所有三个:UINavigationController, UISplitViewController, UITabBarController,因此这些似乎都接管了对状态栏的控制,并将导致preferedStatusBarStyle不为他们的孩子被调用。要覆盖此行为,您可以创建一个扩展,就像前面提到的其他答案一样。这是一个扩展,这三个,在Swift 4。希望苹果对这类事情能更清楚些。
extension UINavigationController {
open override var childViewControllerForStatusBarStyle: UIViewController? {
return self.topViewController
}
open override var childViewControllerForStatusBarHidden: UIViewController? {
return self.topViewController
}
}
extension UITabBarController {
open override var childViewControllerForStatusBarStyle: UIViewController? {
return self.childViewControllers.first
}
open override var childViewControllerForStatusBarHidden: UIViewController? {
return self.childViewControllers.first
}
}
extension UISplitViewController {
open override var childViewControllerForStatusBarStyle: UIViewController? {
return self.childViewControllers.first
}
open override var childViewControllerForStatusBarHidden: UIViewController? {
return self.childViewControllers.first
}
}
编辑:针对Swift 4.2 API更改的更新
extension UINavigationController {
open override var childForStatusBarStyle: UIViewController? {
return self.topViewController
}
open override var childForStatusBarHidden: UIViewController? {
return self.topViewController
}
}
extension UITabBarController {
open override var childForStatusBarStyle: UIViewController? {
return self.children.first
}
open override var childForStatusBarHidden: UIViewController? {
return self.children.first
}
}
extension UISplitViewController {
open override var childForStatusBarStyle: UIViewController? {
return self.children.first
}
open override var childForStatusBarHidden: UIViewController? {
return self.children.first
}
}
Tyson的答案是正确的改变状态栏颜色为白色在UINavigationController。
如果有人想通过在AppDelegate中编写代码来实现相同的结果,那么请使用下面的代码并在AppDelegate的didFinishLaunchingWithOptions方法中编写它。
不要忘记在。plist文件中设置UIViewControllerBasedStatusBarAppearance为YES,否则更改将不会反映。
Code
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
// status bar appearance code
[[UINavigationBar appearance] setBarStyle:UIBarStyleBlack];
return YES;
}
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。
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