夜间模式

最新推荐文章于 2024-03-30 09:33:25 发布

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最新推荐文章于 2024-03-30 09:33:25 发布

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分类专栏： Objective-C

本文链接：https://blog.youkuaiyun.com/yqzh186/article/details/49465743

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本文介绍了一种使用Objective-C实现应用程序夜间模式切换的方法。通过创建基类来统一管理UI的颜色变化，并利用NSNotification进行通知传递，使得所有继承自基类的视图控制器能够响应模式的变化。此外，还介绍了如何通过UIButton触发模式切换并利用NSUserDefaults保存用户的选择。

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夜间模式：利用继承与NSUserDefaults

1.创建基类，负责夜间模式的转换

2.所有的类都继承于基类，基类的模式改变了，所有子类的模式也改变了

3.夜间模式触发的按钮发送通知

4.利用NSUserDefault把模式保存到本地

/*************基类.h***************/

#import "BaseViewController.h"

@interface BaseViewController ()

@end

@implementation BaseViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.


    //父亲默认颜色
    self.view.backgroundColor = [UIColor redColor];
    self.navigationController.navigationBar.barTintColor = [UIColor greenColor];


    //注册通知
    [[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(changeColor:) name:@"changeColor" object:nil];

    //判断模式
    NSString *str = [[NSUserDefaults standardUserDefaults]objectForKey:@"night"];
    if ([str isEqualToString:@"yes"]) {
        self.view.backgroundColor = [UIColor lightGrayColor];
        self.navigationController.navigationBar.barTintColor = [UIColor blackColor];
    }
}
//接受通知触发的方法
-(void)changeColor:(NSNotification *)notification
{

    NSString *str = [[NSUserDefaults standardUserDefaults]objectForKey:@"night"];
    if ([str isEqualToString:@"yes"]) {
        self.view.backgroundColor = [UIColor lightGrayColor];
        self.navigationController.navigationBar.barTintColor = [UIColor blackColor];
    }else
    {
        self.view.backgroundColor = [UIColor redColor];
        self.navigationController.navigationBar.barTintColor = [UIColor greenColor];
    }


}
- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.

}

@end

/*************基类.h***************/

/*************夜间模式触发的按钮***************/

UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
    [self.view addSubview:button];
    button.frame = CGRectMake(100, 100, 200, 40);
    button.backgroundColor = [UIColor blackColor];

    [button addTarget:self action:@selector(buttonAction) forControlEvents:UIControlEventTouchUpInside];


}
-(void)buttonAction
{
    NSString *str = [[NSUserDefaults standardUserDefaults]objectForKey:@"night"];
    if ([str isEqualToString:@"yes"]) {
        [[NSUserDefaults standardUserDefaults] setObject:@"no" forKey:@"night"];

        [[NSNotificationCenter defaultCenter]postNotificationName:@"changeColor" object:@"no"];
    }else
    {
        [[NSUserDefaults standardUserDefaults] setObject:@"yes" forKey:@"night"];

        [[NSNotificationCenter defaultCenter]postNotificationName:@"changeColor" object:@"yes"];
    }

}

/*************夜间模式触发的按钮***************/