ios - 如何通过调用方法设置导航栏颜色？

Question

我创建了 NSObject 的 CommonMethod 子类来自定义 UINavigationBar，这里是 CommonMethod.h 和 CommonMethod.m 文件

CommonMethod.h

#import <UIKit/UIKit.h>
#import <Foundation/Foundation.h>
@interface CommonMethods : NSObject
+(void)setNavBackButton:(id)viewController;
+(void)setNavBackground:(id)viewController Color:(UIColor *)color;
@end

CommonMethod.h

#import <UIKit/UIKit.h>
#import "CommonMethods.h"
@implementation CommonMethods
+(void)setNavBackground:(id)viewController Color:(UIColor *)color
{
    UIViewController *controller = (id)viewController;
    controller.navigationController.navigationBar.backgroundColor=[UIColor redColor];
}
@end

现在，当我调用 [CommonMethods setNavBackground:self Color:[UIColor redColor]; 时，它正在执行该方法但未更改 UI 上的任何内容。谁能解释一下我所缺少的东西吗？

编辑:

我也试过 controller.navigationController.navigationBar.barTintColor = color;

Answer 1

你的代码有小错误

+(void)setNavBackground:(id)viewController Color:(UIColor *)color
{
    UIViewController *controller = (id)viewController;
    controller.navigationController.navigationBar.barTintColor = color; // Change NavigationBar color to Red
}

像这样调用方法:[CommonMethod setNavBackground:self Color:[UIColor redColor]];