iOS 实现后台服务器控制更换主题

作用：在不同日子显示不同风格界面；老板要改已经完成的app的主题颜色；这里不是实现本地更换主题；

1、创建主题管理器

在.h文件中：

@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;

在.m文件里：

+ (ThemeManager *) sharedThemeManager{

static ThemeManager *theme = nil;

static dispatch_once_t onceToken;

dispatch_once(&onceToken, ^{

theme = [[ThemeManager alloc] init];

});

return theme;

}

-(instancetype)init{

if (self = [super init]) {

NSString * themePath = [[NSBundle mainBundle] pathForResource:@"theme" ofType:@"plist"];

self.themePlistDict = [NSDictionary dictionaryWithContentsOfFile:themePath];

self.themeName = nil;

}

return self;

}

- (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];

NSString * themeFilePath = [resourcePath stringByAppendingPathComponent:themeSubPath];

return themeFilePath;

}