Object-C 语言merge两个字典对象

- (id)mutableDictionaryCopyIfNeeded:(id)dictObj{    if ([dictObj isKindOfClass:[NSDictionary class]] &&        ![dictObj isKindOfClass:[NSMutableDictionary class]]) {        dictObj = [dictObj mutableCopy];    }    return dictObj;}/** 合并两个字典 @param dict 被合并的字典 */- (void)mergingWithDictionary:(NSDictionary *)dict{    for (id key in [dict allKeys]) {        id obj = [self mutableDictionaryCopyIfNeeded:[dict objectForKey:key]];        id localObj = [self mutableDictionaryCopyIfNeeded:[self objectForKey:key]];        if ([obj isKindOfClass:[NSDictionary class]] &&            [localObj isKindOfClass:[NSMutableDictionary class]]) {            // Recursive merge for NSDictionary            [localObj mergingWithDictionary:obj];        } else if (obj) {            [self setObject:obj forKey:key];        }    }}/** 合并两个字典 @param dict       被合并的字典 @param ignoredKey 忽略的Key */- (void)mergingWithDictionary:(NSDictionary *)dict ignoredDictKey:(NSString *)ignoredKey{    for (id key in [dict allKeys]) {        if ([key isEqualToString:ignoredKey]) {            continue;        }        id obj = [self mutableDictionaryCopyIfNeeded:[dict objectForKey:key]];        id localObj = [self mutableDictionaryCopyIfNeeded:[self objectForKey:key]];        if ([obj isKindOfClass:[NSDictionary class]] &&            [localObj isKindOfClass:[NSMutableDictionary class]]) {            // Recursive merge for NSDictionary            [localObj mergingWithDictionary:obj];        } else if (obj) {            [self setObject:obj forKey:key];        }    }}