componentsJoinedByString和componentsSeparatedByString的使用

        //1.将数组转换为字符串NSArray *array = @[@"zhangsan",@"wangwu",@"lisi"];NSString *str1 = [array componentsJoinedByString:@","];//2.将字符串转换为数组NSString *str2 = [NSString stringWithFormat:@"王五,李四,张三"];NSArray *array2 = [str2 componentsSeparatedByString:@","];//3.打印结果NSLog(@"%@  %@,",str1,array2);