NSData 和NSArray之间的转换

NSArray *arr1 = [[NSArray alloc]initWithObjects:@"0",@"5",nil];

//将数据转换成NSData类型

NSData *data = [NSKeyedArchiver archivedDataWithRootObject:arr1];

//将数据库中的NSData类型转换成数组

NSArray *arr2 = [NSKeyedUnarchiver unarchiveObjectWithData:data];

NSLog(@"->%@",[arr1 objectAtIndex:1]);

NSLog(@"->%@",[arr2 objectAtIndex:1]);