/**
 生成双面cardView

 @param frame frame
 @param front 正面，可以传入image,string或者view
 @param back 反面，可以传入image,string,nil或者view
 @param tapBlock 点击block,处理翻转，传回idBack状态和view
 @return 返回生成的双面cardview
 */
- (instancetype)initWithFrame:(CGRect)frame
                        front:(__nonnull id)front
                         back:(__nullable id)back
                     tapBlock:(void(^)(BOOL isBack,UIView *tapView))tapBlock

    UIView *test = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 200, 200)];
    test.backgroundColor = [UIColor blackColor];
    
    UIView *testTwo = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 200, 200)];
    testTwo.backgroundColor = [UIColor blackColor];
    
    
    DDCardView *testCard = [[DDCardView alloc]initWithFrame:CGRectMake(10, 10, 200, 200) 
                            front:test 
                            back:testTwo
                            tapBlock:^(BOOL isBack, UIView * _Nonnull tapView) { 
    }];
    [self.view addSubview:testCard];