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
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)。
其他回答
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。
Hippo的回答:如果你正在使用UINavigationController,那么最好添加一个类别:
// UINavigationController+StatusBarStyle.h:
@interface UINavigationController (StatusBarStyle)
@end
// UINavigationController+StatusBarStyle.m:
@implementation UINavigationController (StatusBarStyle)
- (UIStatusBarStyle)preferredStatusBarStyle
{
//also you may add any fancy condition-based code here
return UIStatusBarStyleLightContent;
}
@end
这种解决方案可能比切换到即将被弃用的行为要好。
除了serenn的回答,如果你用modalPresentationStyle(例如.overCurrentContext)呈现一个视图控制器,你也应该在新呈现的视图控制器上调用这个:
presentedViewController.modalPresentationCapturesStatusBarAppearance = true
不要忘记在呈现的视图控制器中重写preferredStatusBarStyle。
对于iOS 13.4, UINavigationController类别中的preferredStatusBarStyle方法将不会被调用,swizzling似乎是唯一的选择,不需要使用子类。
例子:
分类标题:
@interface UINavigationController (StatusBarStyle)
+ (void)setUseLightStatusBarStyle;
@end
实现:
#import "UINavigationController+StatusBarStyle.h"
#import <objc/runtime.h>
@implementation UINavigationController (StatusBarStyle)
void (^swizzle)(Class, SEL, SEL) = ^(Class c, SEL orig, SEL new){
Method origMethod = class_getInstanceMethod(c, orig);
Method newMethod = class_getInstanceMethod(c, new);
if(class_addMethod(c, orig, method_getImplementation(newMethod), method_getTypeEncoding(newMethod)))
class_replaceMethod(c, new, method_getImplementation(origMethod), method_getTypeEncoding(origMethod));
else
method_exchangeImplementations(origMethod, newMethod);
};
+ (void)setUseLightStatusBarStyle {
swizzle(self.class, @selector(preferredStatusBarStyle), @selector(_light_preferredStatusBarStyle));
}
- (UIStatusBarStyle)_light_preferredStatusBarStyle {
return UIStatusBarStyleLightContent;
}
@end
在AppDelegate.h中的用法:
#import "UINavigationController+StatusBarStyle.h"
[UINavigationController setUseLightStatusBarStyle];
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
}
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