一步一步实现iOS主题皮肤切换效果

<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]; 
} 

								 
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