Question

如果我有一对NSArrays填满ints或NSNumbers,如:

A: { 12, 23, 45, 56, 67, 78, 99, 234 }
B: { 12, 56, 78, 99, 454, 512 }

我如何产生一个阵列,其编号为A,但不是B。

{ 23, 45, 67, 234 }

Answer 1

What you are tying to do is purely a set operation. So you can use NSSet here. You should do minusSet: to get the result you want.

NSMutableSet *resultSet = [NSMutableSet setWithArray:A];
NSSet *setB = [NSSet setWithArray:B];

// This is what you need!
[resultSet minusSet:setB];

Array *result = [resultSet allObjects];

Answer 2

建立称为C的NSMutableArray。 Do a loop over A, which tries to seek each of its elements within B (using [B containedObject:elemOfA], which only sents the -isEqual:elemOfA information to each member of B. 如果发现某一要素,则无所作为;如果发现某一要素,则添加到C。

友情链接