iOSのNSDictionaryで文字列value値を取得する数値、ブール、辞書、配列操作

    NSDictionary *dic = @{@"page_num":@"2"};
    NSInteger page = (NSInteger)dic[@"page_num"]; //    
    NSInteger page2 = [dic[@"page_num"] integerValue];
    NSLog(@"%zd %zd", page, page2);

- (BOOL)boolForKey:(NSString *)key
{
    id idObj = [self objectForKey:key];
    if(!idObj)
    {
        return NO;
    }
    NSString *strReturn = [[idObj description] lowercaseString];
    return ([strReturn isEqualToString:@"1"] || [strReturn isEqualToString:@"true"] || [strReturn isEqualToString:@"yes"])?YES:NO;
}