如何更改特定视图上导航栏的颜色

Posted 2023-03-22

【中文标题】如何更改特定视图上导航栏的颜色

【英文标题】：How to change the color of navigation bar on a specific view

【发布时间】：2015-03-02 10:42:35

【问题描述】：

我只需要在某些特定视图上更改导航栏的颜色。 有很多关于修改导航栏颜色的讨论，比如https://***.com/a/18870519/938380，但都是在同一个导航层级下改变每个视图的导航栏颜色。

我想更改特定视图的颜色并保持其他视图的颜色相同。我如何做到这一点？

【参考方案1】：

对于 Swift 4 使用

override func willMove(toParentViewController parent: UIViewController?) 
    self.navigationController?.navigationBar.barTintColor = .red

它提供了更清晰的动画

【参考方案2】：

如果您使用标准导航栏，则无法做到。但是您可以使用一些作弊方法；）例如，您可以将此代码（或类似的东西）添加到您的控制器中：

 - (void)viewDidAppear:(BOOL)animated 
     [super viewDidAppear:animated];
     oldColor = self.navigationController.navigationBar.backgroundColor;//probably barTintColor instead of backgroundColor
     self.navigationController.navigationBar.backgroundColor = [UIColor yellowColor];
 
 - (void)viewWillDisappear:(BOOL)animated 
     [super viewWillDisappear:animated];
     self.navigationController.navigationBar.backgroundColor = oldColor;
 

【参考方案3】：

可以设置navigationController的Bar Tint属性

希望这篇文章对你有帮助

[self.navigationController.navigationBar setBarTintColor:[UIColor redColor]];

【参考方案4】：

我通过 UIViewController 的扩展来处理这种事情。就我而言，我想让选定的导航栏透明。你可以扩展它来处理颜色。这样可以节省在多个控制器中粘贴相同的代码。代码如下。

您从viewWillAppear 致电[self makeNavigationBarTransparent]。从viewWillDisappear 你打电话给[self restoreNavigationBar]

对于您的情况，您只需将其扩展为添加 makeNavigationBarColored。

一个选项是子类 UINavigationController 来创建一个具有特定颜色的类。在它的实现中使用这个扩展来设置颜色。在您的故事板中，使您希望此颜色成为您的新类类型的任何控制器。然后，您将在情节提要中完成所有这些操作。

UIViewController+TransparentNavigationBar.h

#import <UIKit/UIKit.h>

@interface UIViewController (TransparentNavigationBar)

/** Makes the current navigation bar transparent and returns a context holding
 * the original settings.
 */
- (void) makeNavigationBarTransparent;

/**
 * Restores the current navigation bar to its original settings.
 */
- (void) restoreNavigationBar;

@end

UIViewController+TransparentNavigationController.m

#import "UIViewController+TransparentNavigationBar.h"
#import <objc/runtime.h>

@interface VSSNavigationBarContext:NSObject

/** Backup of nav bar image used to restore on push. */
@property UIImage *originalNavBarBackgroundImage;
/** Backup of nav bar shadow image used to restore on push. */
@property UIImage *originalNavBarShadowImage;
/** Backup of nav bar color used to restore on push. */
@property UIColor *originalNavBarColour;

@end

@implementation VSSNavigationBarContext

- (id) init 
    self=[super init];
    if (self)
        self.originalNavBarBackgroundImage=nil;
        self.originalNavBarShadowImage=nil;
        self.originalNavBarColour=nil;
    
    return self;


@end

static char const * const ObjectTagKey = "NavBarContextTag";

@implementation UIViewController (TransparentNavigationBar)

- (VSSNavigationBarContext *) getContext

    VSSNavigationBarContext *context=(VSSNavigationBarContext *)objc_getAssociatedObject(self, &ObjectTagKey);
    return context;


- (void) makeNavigationBarTransparent
    VSSNavigationBarContext *context=(VSSNavigationBarContext *)objc_getAssociatedObject(self, &ObjectTagKey);
    if (context == nil)
        context=[[VSSNavigationBarContext alloc] init];

        context.originalNavBarBackgroundImage=[self.navigationController.navigationBar backgroundImageForBarMetrics:UIBarMetricsDefault];
        context.originalNavBarShadowImage=self.navigationController.navigationBar.shadowImage;
        context.originalNavBarColour=self.navigationController.view.backgroundColor;

        // Store the original settings
        objc_setAssociatedObject(self, &ObjectTagKey, context, OBJC_ASSOCIATION_RETAIN);
    

    //
    // Make transparent
    //
    [self.navigationController.navigationBar setBackgroundImage:[UIImage new]
                                                  forBarMetrics:UIBarMetricsDefault];
    self.navigationController.navigationBar.shadowImage = [UIImage new];
    if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 7.0f)
        self.navigationController.navigationBar.translucent = YES;
    
    else
        self.navigationController.navigationBar.translucent = NO;
    
    self.navigationController.view.backgroundColor = [UIColor clearColor];


- (void) restoreNavigationBar

    VSSNavigationBarContext *context=(VSSNavigationBarContext *)objc_getAssociatedObject(self, &ObjectTagKey);
    if (context != nil)
        // Restore original
        [self.navigationController.navigationBar setBackgroundImage:context.originalNavBarBackgroundImage forBarMetrics:UIBarMetricsDefault];
        self.navigationController.navigationBar.shadowImage = context.originalNavBarShadowImage;
        if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 7.0f)
            self.navigationController.navigationBar.translucent = YES;
        
        else
            self.navigationController.navigationBar.translucent = NO;
        
        self.navigationController.view.backgroundColor = context.originalNavBarColour;
    


@end