iOS-夜间模式(换肤设置)

本文来自简书，原文地址:http://www.jianshu.com/p/c8e638e76e83

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!

思路: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。

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

一. 创建一个管理模式主题的单例管理类ThemeManage

ThemeManage.h 文件:

#import <Foundation/Foundation.h>#import <UIKit/UIKit.h>@interface ThemeManage : NSObject#pragma mark - 颜色属性@property(nonatomic, retain) UIColor *bgColor;@property(nonatomic, retain) UIColor *color1;@property(nonatomic, retain) UIColor *color2;@property(nonatomic, retain) UIColor *textColor;@property(nonatomic, retain) UIColor *textColorGray;@property(nonatomic, retain) UIColor *navBarColor;@property(nonatomic, retain) UIColor *colorClear;#pragma mark -// 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;@end

ThemeManage. m 文件

#import "ThemeManage.h"static ThemeManage *themeManage; // 单例@implementation ThemeManage#pragma mark - 单例的初始化+ (ThemeManage *)shareThemeManage {    static dispatch_once_t onceToken;    dispatch_once(&onceToken, ^{        themeManage = [[ThemeManage alloc] init];    });    return themeManage;}#pragma mark 重写isNight的set方法- (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];    });}@end

二. 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);这里拿 UIView 做例子:

#import <UIKit/UIKit.h>/** * 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};@interface UIView (ThemeChange)// 定义颜色类型的属性, NSNumber类型@property(nonatomic, assign) id type;// 消息中心开始监听- (void)startMonitor;// 改变颜色的方法- (void)changeColor;// 设置颜色类型和对应颜色- (void)NightWithType:(UIViewColorType)type;// 设置字体颜色的方法- (void)initTextColor;@end

#import "UIView+ThemeChange.h"#import "ThemeManage.h"// 添加runtime头文件#import <objc/runtime.h>@implementation UIView (ThemeChange)#pragma mark - 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));}#pragma mark - 开始监听- (void)startMonitor {    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(changeColor) name:@"changeColor" object:nil];}#pragma mark - 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;    }}#pragma mark - 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];}#pragma mark - 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 {}@end

三. 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"

- (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:

- (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];}

四. 添加控制白天/黑夜模式item,发通知切换相对应i模式及image.

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

    [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:)];

#pragma mark  - 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];}

五. 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];

这时候测试下, 看下效果:

夜间模式.gif