概述

详细

一、实现功能及主要思路

实现功能:

iOS 开发中有时候会有夜间模式(换肤设置)的需求, 其实主要是更改相关颜色操作.每次切换夜间/白天模式时，都会发出通知给所有ViewController，让它们切换到相应的主题.

主要思路:

1. 创建一个管理模式主题的单例管理类ThemeManage

2. 封装好需要做夜间模式变色处理的控件扩展:UIView (ThemeChange), UINavigationBar (ThemeChange), UITabBar (ThemeChange), UILabel (ThemeChange), UIButton (ThemeChange)

3. 在 AppDelegate里先获取夜间模式状态, 根控制器里先设置tabBar 及 子控制器里navigationBar的夜间模式状态

4. 添加控制白天/黑夜模式item,发通知切换相对应i模式及image

5. 添加相关控件是否黑夜模式下已更换字色和背景色

二、程序实现

Step1. 创建一个管理模式主题的单例管理类

ThemeManage.h 文件里添加模式管理单例:

// 是否是夜间 YES表示夜间, NO为正常
@property(nonatomic, assign) BOOL isNight;
/*** 模式管理单例*/
+ (ThemeManage *)shareThemeManage;

ThemeManage. m 文件:

单例的初始化:

+ (ThemeManage *)shareThemeManage {static dispatch_once_t onceToken;dispatch_once(&onceToken, ^{themeManage = [[ThemeManage alloc] init];});return themeManage;
}

重写isNight的set方法 (是否是夜间 YES表示夜间, NO为正常)

- (void)setIsNight:(BOOL)isNight {_isNight = isNight;if (self.isNight) { // 夜间模式改变相关颜色self.bgColor = [UIColor colorWithRed:0.06 green:0.08 blue:0.1 alpha:1];self.textColor = [UIColor whiteColor];self.color1 = [UIColor colorWithRed:0.08 green:0.11 blue:0.13 alpha:1];self.navBarColor = [UIColor whiteColor];self.color2 = [UIColor colorWithRed:0.2 green:0.31 blue:0.43 alpha:1];self.textColorGray = [UIColor whiteColor];} else{self.bgColor = [UIColor whiteColor];self.textColor = [UIColor blackColor];self.color1 = [UIColor colorWithRed:0.06 green:0.25 blue:0.48 alpha:1];self.navBarColor = [UIColor colorWithRed:0.31 green:0.73 blue:0.58 alpha:1];self.color2 = [UIColor colorWithRed:0.57 green:0.66 blue:0.77 alpha:1];self.textColorGray = [UIColor grayColor];}static dispatch_once_t onceToken;dispatch_once(&onceToken, ^{self.colorClear = [UIColor clearColor];});
}

Step2. 封装好需要做夜间模式变色处理的控件扩展

一般需要UIView (ThemeChange), UINavigationBar (ThemeChange), UITabBar (ThemeChange), UILabel (ThemeChange), UIButton (ThemeChange);

详情见 Demo, 这里拿 UIView 做例子:

添加颜色状态枚举值 颜色的定义(一个代表一套):

typedef NS_ENUM(NSInteger, UIViewColorType) {UIViewColorTypeNormal, // 白天白色, 夜间黑色UIViewColorType1, // 白天蓝色, 夜间深灰UIViewColorType2, // 白天浅蓝, 夜间浅蓝UIViewColorTypeClear // 透明状态
};

添加type的set,get方法:

- (void)setType:(id)type {objc_setAssociatedObject(self, @selector(type), type, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}
- (id)type {return objc_getAssociatedObject(self, @selector(type));
}

开始监听:

- (void)startMonitor {[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(changeColor) name:@"changeColor" object:nil];
}

改变颜色:

- (void)changeColor {// type为NSNumber型, 变为NSIntegerswitch ([self.type integerValue]) {case UIViewColorTypeNormal:self.backgroundColor = [ThemeManage shareThemeManage].bgColor;break;case UIViewColorType1:self.backgroundColor = [ThemeManage shareThemeManage].color1;break;case UIViewColorType2:self.backgroundColor = [ThemeManage shareThemeManage].color2;break;case UIViewColorTypeClear:self.backgroundColor = [ThemeManage shareThemeManage].colorClear;break;default:break;}}

设置颜色类型和对应颜色:

- (void)NightWithType:(UIViewColorType)type {self.type = [NSNumber numberWithInteger:type];[self changeColor];[self startMonitor];// 调用设置字体颜色的方法[self initTextColor];
}

改变字体颜色的方法, 空方法, 可以在子类中重写这个方法来改变颜色(例如:Label):

- (void)initTextColor {}

Step3. 在 AppDelegate里先获取夜间模式状态, 根控制器里先设置tabBar 及 子控制器里navigationBar的夜间模式状态

#import "ThemeManage.h"
#import "UIView+ThemeChange.h"

获取夜间模式状态:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {// 获取夜间模式状态[ThemeManage shareThemeManage].isNight = [[NSUserDefaults standardUserDefaults] boolForKey:@"night"];self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];self.window.backgroundColor = [UIColor whiteColor];[self.window makeKeyAndVisible];RootViewController *rootVc = [[RootViewController alloc] init];self.window.rootViewController = rootVc;return YES;
}

RootViewController.m 文件里设置navigationBar的夜间模式状态:

- (void)viewDidLoad {[super viewDidLoad];[self.view NightWithType:UIViewColorTypeNormal];HomeViewController *vc = [[HomeViewController alloc] init];UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:vc];// 设置navigationBar的夜间模式状态[nav.navigationBar NightWithType:UIViewColorTypeNormal];vc.tabBarItem = [[UITabBarItem alloc] initWithTitle:@"首页" image:[UIImage imageNamed:@"home"] tag:10];SchemaViewController *secondVC = [[SchemaViewController alloc] init];UINavigationController *nav1 = [[UINavigationController alloc] initWithRootViewController:secondVC];// 设置navigationBar的夜间模式状态[nav1.navigationBar NightWithType:UIViewColorTypeNormal];secondVC.tabBarItem = [[UITabBarItem alloc] initWithTitle:@"菜单" image:[UIImage imageNamed:@"schema"] tag:11];[self.tabBar NightWithType:UIViewColorTypeNormal];self.viewControllers = @[nav, nav1];self.tabBar.translucent = NO;[[UINavigationBar appearance] setTranslucent:NO];
}

Step4. 添加控制白天/黑夜模式item,发通知切换相对应i模式及image

    [self.view NightWithType:UIViewColorTypeNormal];UIImage *barButtonImage = [ThemeManage shareThemeManage].isNight ? [UIImage imageNamed:@"night"] : [UIImage imageNamed:@"day"];self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithImage:barButtonImage style:UIBarButtonItemStylePlain target:self action:@selector(rightBarBtnAction:)];

Action点击动作事件(切换夜间模式):

- (void)rightBarBtnAction:(UIBarButtonItem *)barButton {[ThemeManage shareThemeManage].isNight = ![ThemeManage shareThemeManage].isNight;[[NSNotificationCenter defaultCenter] postNotificationName:@"changeColor" object:nil];[[NSUserDefaults standardUserDefaults] setBool:[ThemeManage shareThemeManage].isNight forKey:@"night"];UIImage *barBtnImage = [ThemeManage shareThemeManage].isNight ? [UIImage imageNamed:@"night"] : [UIImage imageNamed:@"day"];[barButton setImage:barBtnImage];
}

发了通知不要忘记移除监听:

- (void)dealloc {// 移除监听[[NSNotificationCenter defaultCenter] removeObserver:self];
}

Step5. 添加相关控件是否黑夜模式下已更换字色和背景色

#import "UILabel+ThemeChange.h"

  UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(100, 100, 200, 40)];label.text = @"测试看看字色及背景色";[label NightWithType:UIViewColorTypeNormal];[label NightTextType:LabelColorGray];[self.view addSubview:label];

三、项目截图及运行效果

项目截图:

这时候测试下, 看下运行效果:

夜间模式对比截图:

四、其他补充

界面性问题可以根据自己项目需求调整即可, 具体可参考代码, 项目能够直接运行!