iOS-夜间模式(换肤设置)

概述

iOS 开发中有时候会有夜间模式(换肤设置)的需求, 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.

详细

代码下载：http://www.demodashi.com/demo/10668.html

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NSInteger
    switch ([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];