iOS实现换肤功能的简单处理框架（附源码）

{
 "color": {
 "Black_A":"323232",
 "Black_AT":"323232",
 "Black_B":"888888",
 "Black_BT":"888888",

 "White_A":"ffffff",
 "White_AT":"ffffff",
 "White_AN":"ffffff",

 "Red_A":"ff87a0",
 "Red_AT":"ff87a0",
 "Red_B":"ff5073",
 "Red_BT":"ff5073",

 "Colour_A":"377ce4",
 "Colour_B":"6aaafa",
 "Colour_C":"ff8c55",
 "Colour_D":"ffa200",
 "Colour_E":"c4a27a",
 }
}

- (void)loadConfigWithFileName:(NSString *)fileName level:(NSInteger)level {
 if (fileName.length == 0) {
 return;
 }
 
 pthread_rwlock_wrlock(&_rwlock);
 __block BOOL finded = NO;
 [self.configFileQueue enumerateObjectsUsingBlock:^(YTThemeConfigFile *_Nonnull obj, NSUInteger idx, BOOL *_Nonnull stop) {
 if ([obj.fileName isEqualToString:fileName]) {
  finded = YES;
  *stop = YES;
 }
 }];
 if (!finded) {
 // 新增配置文件
 YTThemeConfigFile *file = [[YTThemeConfigFile alloc] init];
 file.fileName = fileName;
 file.level = level;
 [self.configFileQueue addObject:file];
 // 优先级排序
 [self.configFileQueue sortUsingComparator:^NSComparisonResult(YTThemeConfigFile *_Nonnull obj1, YTThemeConfigFile *_Nonnull obj2) {
  if (obj1.level > obj2.level) {
  return NSOrderedDescending;
  }
  return NSOrderedAscending;
 }];
 [self setupConfigFilesContainDefault:YES];
 }
 pthread_rwlock_unlock(&_rwlock);
}

- (void)setupConfigFilesContainDefault:(BOOL)containDefault {
 NSMutableDictionary *defaultColorDict = nil, *currentColorDict = nil;
 
 // 加载默认配置
 if (containDefault) {
 defaultColorDict = [NSMutableDictionary dictionary];
 [self loadConfigDataWithColorMap:defaultColorDict valueMap:nil isDefault:YES];
 
 self.defaultColorMap = defaultColorDict;
 }
 
 // 加载主题配置
 if (_themePath.length > 0) {
 currentColorDict = [NSMutableDictionary dictionary];
 [self loadConfigDataWithColorMap:currentColorDict valueMap:nil isDefault:NO];
 
 self.currentColorMap = currentColorDict;
 }
 
 // 发送主体颜色变更通知
 [self notifyThemeDidChange];
}

- (void)notifyThemeDidChange {
 NSArray *allActionObjects = self.actionMap.objectEnumerator.allObjects;
 for (YTThemeAction *action in allActionObjects) {
 [action notifyThemeDidChange];
 }
}

- (void)loadConfigDataWithColorMap:(NSMutableDictionary *)colorMap valueMap:(NSMutableDictionary *)valueMap isDefault:(BOOL)isDefault {
 // 每一次新增一个配置文件，所有配置文件都得重新计算一次，这里有很多重复多余的工作
 [self.configFileQueue enumerateObjectsUsingBlock:^(YTThemeConfigFile *_Nonnull obj, NSUInteger idx, BOOL *_Nonnull stop) {
 NSDictionary *dict = nil;
 if (isDefault) {
  dict = obj.defaultDict;
 } else {
  dict = obj.currentDict;
 }
 if (dict.count > 0) {
  [self loadThemeColorTo:colorMap from:dict]; // 将所有配置表中的color字段的数据都放到colorMap中
 }
 }];
}

- (void)loadThemeColorTo:(NSMutableDictionary *)dictionary from:(NSDictionary *)from {
 NSDictionary<NSString *, NSString *> *colors = from[@"color"];
 [colors enumerateKeysAndObjectsUsingBlock:^(NSString *_Nonnull key, NSString *_Nonnull obj, BOOL *_Nonnull stop) {
 // 十六进制字符串转为UIColor
 UIColor *color = [UIColor yt_nullcolorWithHexString:obj];
 if (color) {
  [dictionary setObject:color forKey:key];
 } else {
  [dictionary setObject:obj forKey:key];
 }
 }];
}

/**
 获取颜色值
 */
- (UIColor *)colorForKey:(NSString *)key {
 pthread_rwlock_rdlock(&_rwlock);
 UIColor *color = [self colorForKey:key isReserveKey:NO redirectCount:0];
 pthread_rwlock_unlock(&_rwlock);
 return color;
}

- (UIColor *)colorForKey:(NSString *)key isReserveKey:(BOOL)isReserveKey redirectCount:(NSInteger)redirectCount {
 if (key == nil) {
 return nil;
 }
 
 ///正常获取色值
 id colorObj = [_currentColorMap objectForKey:key];
 if (colorObj == nil) {
 colorObj = [_defaultColorMap objectForKey:key];
 }
 
 if (isReserveKey && colorObj == nil) {
 return nil;
 }
 
 ///看看是否有替补key
 if (colorObj == nil) {
 NSString *reserveKey = [_reserveKeyMap objectForKey:key];
 if (reserveKey) {
  colorObj = [self colorForKey:reserveKey isReserveKey:YES redirectCount:redirectCount];
 }
 }
 
 ///查看当前key 能否转成 color
 if (colorObj == nil) {
 colorObj = [UIColor yt_colorWithHexString:key];
 }
 
 if ([colorObj isKindOfClass:[UIColor class]]) {
 ///如果是 重定向 或者 替补 key 的color 要设置到 当前 colorDict 里面
 // 重定向的配置形如："Red_A":"Red_B",
 if (redirectCount > 0 || isReserveKey) {
  [_currentColorMap ?: _defaultColorMap setObject:colorObj forKey:key];
 }
 return colorObj;
 } else {
 if (redirectCount < 3) { // 重定向递归
  return [self colorForKey:colorObj isReserveKey:NO redirectCount:redirectCount   1];
 } else {
  return [UIColor blackColor];
 }
 }
}

#define YTThemeColor(key) ([[YTThemeManager sharedInstance] colorForKey:key])

UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 20, 200, 40)];
label.text = @"Text";
label.textColor = YTThemeColor(kCK_Red_A);
label.backgroundColor = YTThemeColor(kCK_Black_H);
[self.view addSubview:label];

// .h 中的声明
///Black
FOUNDATION_EXTERN NSString *kCK_Black_A;
FOUNDATION_EXTERN NSString *kCK_Black_AT;
FOUNDATION_EXTERN NSString *kCK_Black_B;
FOUNDATION_EXTERN NSString *kCK_Black_BT;

// .m 中的定义
NSString *kCK_Black_A = @"Black_A";
NSString *kCK_Black_AT = @"Black_AT";
NSString *kCK_Black_B = @"Black_B";
NSString *kCK_Black_BT = @"Black_BT";

/**
 设置主题文件的路径
 @param themePath 文件的路径
 */
- (void)setupThemePath:(NSString *)themePath {
 pthread_rwlock_wrlock(&_rwlock);
 
 _themePath = [themePath copy];
 
 self.currentColorMap = nil;
 
 if ([_themePath.lowercaseString isEqualToString:[[NSBundle mainBundle] resourcePath].lowercaseString]) {
 _themePath = nil;
 }
 
 self.currentThemePath = _themePath;
 
 for (int i = 0; i < self.configFileQueue.count; i  ) {
 YTThemeConfigFile *obj = [self.configFileQueue objectAtIndex:i];
 [obj resetCurrentDict];
 }
 [self setupConfigFilesContainDefault:NO];
 
 pthread_rwlock_unlock(&_rwlock);
}