一步一步实现iOS主题皮肤切换效果

#import <UIKit/UIKit.h> @interface BaseViewController : UIViewController  - (void) reloadThemeImage; @end 

#import "BaseViewController.h"  #import "ThemeManager.h" #import "NotificationMacro.h"  @interface BaseViewController ()  @end  @implementation BaseViewController - (id) init {  if (self == [super init]) {   [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(themeChangedNotfication:) name:kThemeChangedNotification object:nil];  }    [self reloadThemeImage];  return self; }  - (void)viewDidLoad {  [super viewDidLoad];  [self reloadThemeImage]; }  - (void)didReceiveMemoryWarning {  [super didReceiveMemoryWarning];  // Dispose of any resources that can be recreated. }  - (void) themeChangedNotfication:(NSNotification *)notification {  [self reloadThemeImage]; }  - (void) reloadThemeImage {  ThemeManager * themeManager = [ThemeManager sharedThemeManager];    UIImage * navigationBackgroundImage = [themeManager themeImageWithName:@"navigationbar_background.png"];  [self.navigationController.navigationBar setBackgroundImage:navigationBackgroundImage forBarMetrics:UIBarMetricsDefault];    UIImage * tabBarBackgroundImage = [themeManager themeImageWithName:@"tabbar_background.png"];  [self.tabBarController.tabBar setBackgroundImage:tabBarBackgroundImage]; } @end 

#import "AppDelegate.h"  #import "MainViewController.h" #import "ThemeManager.h" #import "NotificationMacro.h"  @interface AppDelegate ()  @end  @implementation AppDelegate   - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {  [self initUserDefaultConfig];    MainViewController * rootViewController = [[MainViewController alloc] init];  self.window.rootViewController = rootViewController;    return YES; }   - (void) initUserDefaultConfig {  NSString * themeName = [[NSUserDefaults standardUserDefaults] objectForKey:kThemeNameKey];  ThemeManager * themeManager = [ThemeManager sharedThemeManager];  themeManager.themeName = themeName; }</span></span> 

<span style="font-weight: normal;"><span style="font-weight: normal;">#import "MainViewController.h"  #import "HomeViewController.h" #import "MessageViewController.h" #import "MineViewController.h"  #import "UIFactory.h"   @interface MainViewController ()  @end  @implementation MainViewController  - (id) init {  if (self = [super init]) {   [self initTabBarUI];  }    return self; }  - (void)viewDidLoad {  [super viewDidLoad];   }  - (void)didReceiveMemoryWarning {  [super didReceiveMemoryWarning]; }   - (void) initTabBarUI {  // 主页  HomeViewController * homeViewController = [[HomeViewController alloc] init];  UINavigationController * homeNavigationController = [[UINavigationController alloc] initWithRootViewController:homeViewController]; // UITabBarItem * homeTabBarItem = [[UITabBarItem alloc] initWithTitle:@"主页" image:[UIImage imageNamed:@"tabbar_home"] selectedImage:[UIImage imageNamed:@"tabbar_home_selected"]];  UITabBarItem * homeTabBarItem = [UIFactory createTabBarItemWithTitle:@"主页" imageName:@"tabbar_home" selectedImage:@"tabbar_home_selected"];  homeNavigationController.tabBarItem = homeTabBarItem;    // 消息（中心）  MessageViewController * messageViewController = [[MessageViewController alloc] init];  UINavigationController * messageNavigationController = [[UINavigationController alloc] initWithRootViewController:messageViewController]; // UITabBarItem * messageTabBarItem = [[UITabBarItem alloc] initWithTitle:@"消息" image:[UIImage imageNamed:@"tabbar_message_center"] selectedImage:[UIImage imageNamed:@"tabbar_message_center_selected"]];  UITabBarItem * messageTabBarItem = [UIFactory createTabBarItemWithTitle:@"消息" imageName:@"tabbar_message_center" selectedImage:@"tabbar_message_center_selected"];  messageNavigationController.tabBarItem = messageTabBarItem;    // 我  MineViewController * mineViewController = [[MineViewController alloc] init];  UINavigationController * mineNavigationController = [[UINavigationController alloc] initWithRootViewController:mineViewController]; // UITabBarItem * mineTabBarItem = [[UITabBarItem alloc] initWithTitle:@"我" image:[UIImage imageNamed:@"tabbar_profile"] selectedImage:[UIImage imageNamed:@"tabbar_profile_selected"]];  UITabBarItem * mineTabBarItem = [UIFactory createTabBarItemWithTitle:@"我" imageName:@"tabbar_profile" selectedImage:@"tabbar_profile_selected"];      mineNavigationController.tabBarItem = mineTabBarItem;  NSArray * viewControllers = @[homeNavigationController, messageNavigationController, mineNavigationController];  self.viewControllers = viewControllers; }   @end 

#import <Foundation/Foundation.h> #import <UIKit/UIKit.h>  @interface ThemeManager : NSObject  @property (nonatomic, copy) NSString * themeName;   // 主题名字 @property (nonatomic, retain) NSDictionary * themePlistDict; // 主题属性列表字典  + (ThemeManager *) sharedThemeManager;  - (UIImage *) themeImageWithName:(NSString *)imageName; @end</span></span> 

<span style="font-weight: normal;"><span style="font-weight: normal;">#import <Foundation/Foundation.h> #import <UIKit/UIKit.h>  @interface ThemeManager : NSObject  @property (nonatomic, copy) NSString * themeName;   // 主题名字 @property (nonatomic, retain) NSDictionary * themePlistDict; // 主题属性列表字典  + (ThemeManager *) sharedThemeManager;  - (UIImage *) themeImageWithName:(NSString *)imageName; @end #import "ThemeManager.h" #import "NotificationMacro.h" static ThemeManager * sharedThemeManager;  @implementation ThemeManager  - (id) init {  if(self = [super init]) {   NSString * themePath = [[NSBundle mainBundle] pathForResource:@"theme" ofType:@"plist"];   self.themePlistDict = [NSDictionary dictionaryWithContentsOfFile:themePath];   self.themeName = nil;  }    return self; }  + (ThemeManager *) sharedThemeManager {  @synchronized(self) {   if (nil == sharedThemeManager) {    sharedThemeManager = [[ThemeManager alloc] init];   }  }    return sharedThemeManager; }  // Override 重写themeName的set方法 - (void) setThemeName:(NSString *)themeName {  _themeName = themeName; }  - (UIImage *) themeImageWithName:(NSString *)imageName {  if (imageName == nil) {   return nil;  }    NSString * themePath = [self themePath];  NSString * themeImagePath = [themePath stringByAppendingPathComponent:imageName];  UIImage * themeImage = [UIImage imageWithContentsOfFile:themeImagePath];    return themeImage; }  // 返回主题路径 - (NSString *)themePath {  NSString * resourcePath = [[NSBundle mainBundle] resourcePath];  if (self.themeName == nil || [self.themeName isEqualToString:@""]) {   return resourcePath;  }      NSString * themeSubPath = [self.themePlistDict objectForKey:self.themeName]; // Skins/blue  NSString * themeFilePath = [resourcePath stringByAppendingPathComponent:themeSubPath]; // .../Skins/blue    return themeFilePath; } @end 

#import <UIKit/UIKit.h> @interface ThemeTabBarItem : UITabBarItem  @property (nonatomic, copy) NSString * imageName; @property (nonatomic, copy) NSString * selectedImageName;   - (id) initWithTitle:(NSString *)title imageName:(NSString *)imageName selectedImage:(NSString *)selectedImageName;  @end </span></span> 

<span style="font-weight: normal;"><span style="font-weight: normal;">#import "ThemeTabBarItem.h" #import "ThemeManager.h" #import "NotificationMacro.h"  @implementation ThemeTabBarItem  // 初始化时注册观察者 - (id) init {  if (self = [super init]) {   [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(themeChangedNotification:) name:kThemeChangedNotification object:nil];  }    return self; }  - (id) initWithTitle:(NSString *)title imageName:(NSString *)imageName selectedImage:(NSString *)selectedImageName {  if (self = [self init]) {   self.title = title;   self.imageName = imageName;   // 此时会调用[self setImageName:imageName] ---> [self reloadThemeImage] --->[self setImage:image]   self.selectedImageName = selectedImageName;// 此时会调用[self setSelectedImageName:selectedImageName];  }    return self; }   #pragma mark - #pragma mark - Override Setter - (void) setImageName:(NSString *)imageName {  if (_imageName != imageName) {   _imageName = imageName;  }    [self reloadThemeImage]; }  - (void) setSelectedImageName:(NSString *)selectedImageName {  if (_selectedImageName != selectedImageName) {   _selectedImageName = selectedImageName;  }    [self reloadThemeImage]; }    // 主题改变之后重新加载图片 - (void)themeChangedNotification:(NSNotification *)notification {  [self reloadThemeImage]; }  - (void)reloadThemeImage {  ThemeManager * themeManager = [ThemeManager sharedThemeManager];    if (self.imageName != nil) {   UIImage * image = [themeManager themeImageWithName:self.imageName];   [self setImage:image];  }    if (self.selectedImageName != nil) {   UIImage * selectedImage = [themeManager themeImageWithName:self.selectedImageName];   [self setSelectedImage:selectedImage];  } }  - (void) dealloc {  [[NSNotificationCenter defaultCenter] removeObserver:self]; } 

#import <Foundation/Foundation.h> #import <UIKit/UIKit.h>  @interface UIFactory : NSObject  + (UITabBarItem *) createTabBarItemWithTitle:(NSString *)title imageName:(NSString *)imageName selectedImage:(NSString *)selectedImageName;   @end</span></span> 

<span style="font-weight: normal;"><span style="font-weight: normal;">#import <Foundation/Foundation.h> #import <UIKit/UIKit.h>  @interface UIFactory : NSObject  + (UITabBarItem *) createTabBarItemWithTitle:(NSString *)title imageName:(NSString *)imageName selectedImage:(NSString *)selectedImageName;   @end #import "UIFactory.h"  #import "ThemeTabBarItem.h" @implementation UIFactory  + (UITabBarItem *) createTabBarItemWithTitle:(NSString *)title imageName:(NSString *)imageName selectedImage:(NSString *)selectedImageName {  ThemeTabBarItem * themeTabBarItem = [[ThemeTabBarItem alloc] initWithTitle:title imageName:imageName selectedImage:selectedImageName];    return themeTabBarItem; } @end 

#import "BaseViewController.h"  @interface MineViewController : BaseViewController <UITableViewDelegate, UITableViewDataSource>   @property (weak, nonatomic) IBOutlet UITableView *tableView;  @property (nonatomic, retain) NSMutableArray * themeDataSource; @end 

#import "BaseViewController.h"  @interface MineViewController : BaseViewController <UITableViewDelegate, UITableViewDataSource>   @property (weak, nonatomic) IBOutlet UITableView *tableView;  @property (nonatomic, retain) NSMutableArray * themeDataSource; @end #import "MineViewController.h"  #import "ThemeManager.h" #import "NotificationMacro.h"  @interface MineViewController ()  @end  @implementation MineViewController  - (void)viewDidLoad {  [super viewDidLoad];  self.title = @"我";    ThemeManager * themeManager = [ThemeManager sharedThemeManager];  _themeDataSource = [NSMutableArray arrayWithArray:themeManager.themePlistDict.allKeys]; }  - (void)didReceiveMemoryWarning {  [super didReceiveMemoryWarning];  // Dispose of any resources that can be recreated. }    #pragma mark - #pragma mark - UITableViewDelegate - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {   return self.themeDataSource.count; }  - (UITableViewCell *) tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {  static NSString * Identifier = @"Cell";  UITableViewCell * cell = [tableView dequeueReusableCellWithIdentifier:Identifier];  if (cell == nil) {   cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:Identifier];  }    NSString * text = self.themeDataSource[indexPath.row];  cell.textLabel.text = text;    ThemeManager * themeManager = [ThemeManager sharedThemeManager];  NSString * currentTheme = themeManager.themeName;  if (currentTheme == nil) {   currentTheme = @"默认";  }  if ([currentTheme isEqualToString:text]) {   cell.accessoryType = UITableViewCellAccessoryCheckmark;  } else {   cell.accessoryType = UITableViewCellAccessoryNone;  }    return cell; }  - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {    ThemeManager * themeManager = [ThemeManager sharedThemeManager];  NSString * themeName = self.themeDataSource[indexPath.row];    if ([themeName isEqualToString:@"默认"]) {   themeName = nil;  }    // 记录当前主题名字  themeManager.themeName = themeName;  [[NSNotificationCenter defaultCenter] postNotificationName:kThemeChangedNotification object:nil];      // 主题持久化  NSUserDefaults * userDefaults = [NSUserDefaults standardUserDefaults];  [userDefaults setObject:themeName forKey:kThemeNameKey];  [userDefaults synchronize];    // 重新加载数据显示UITableViewCellAccessoryCheckmark 显示选中的对号 v  [self.tableView reloadData]; }