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
注意,当使用self.navigationController.navigationBar.barStyle = UIBarStyleBlack;解决方案
请确保进入你的plist并设置“基于视图控制器的状态栏外观”为YES。如果不是,它将不起作用。
其他回答
Swift 3 iOS 10解决方案:
override var 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
}
}
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
}
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];
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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