object-c-foundation-Array Sorting

system type sorting;

Nsarray *goodsnames [Email protected][@ "Computer" @ "iphone" @ "ipad"];

Nsarray *sortedarray=[goodsnames sortedarrayusingselector: @selector (compare:)];

Custom sorting

Person *p1=[[person alloc]initwithname:@ "Tom" Andage:12 Andcard:nil];

Person *p2=[[person alloc]initwithname:@ "Jack" andage:23 Andcard:nil];

Person *p1=[[person alloc]initwithname:@ "Maggie" Andage:11 Andcard:nil];

Nsarry *[email PROTECTED][P1,P2,P3];

Define a Compareperson method in the person class

/***************************************************************

-(Nscomparisonresult) Compareperson: (person *) person

{

NSNumber *age1=[[nsnumber Alloc]initwithint:self.age];

NSNumber *age2=[[nsnumber Alloc]initwithint:person.age];

Nscomparisonresult Result=[age1 Compare:age2];

if (result = = Nsorderedsame)

{

Result=[self.name Compare:person.name];

}

return result;

}

/******************************************************************

Nsarray *[email PROTECTED][P1,P2,P3];

Nsarray *sortedarray=[personsarray sortedarrayusingselector: @selector (Compareperson:)];

Finish sorting the Personsarray

Sorting by using block

Nsarray *sortedarray=[personsarray sortedarrayusingcomparator:^nscomparisonresult (id obj1,id obj2) {

Person *p1= (person *) obj1;

Person *p2= (person *) obj2;

NSNumber *age1=[[nsnumber Alloc]initwithint:self.age];

NSNumber *age2=[[nsnumber Alloc]initwithint:person.age];

Nscomparisonresult Result=[age1 Compare:age2];

if (result = = Nsorderedsame)

{

Result=[self.name Compare:person.name];

}

return result;

}

Complex sorting

Nssortdescriptor

Nssortdescriptor *sort1=[[nssortdescriptor]initwithkey:@ "name" Ascending:yes];

Nssortdescriptor *sort2=[[nssortdescriptor]initwithkey:@ "age" ascending:yes];

Nsarray *[email Protected][sort1,sort2];

Nsarray *sortedarray =[personsarray Sortedarrayusingdescriptors:conditionsarray];

/*******************

Nssortdescriptor *sort1=[[nssortdescriptor]initwithkey:@ "name" Ascending:yes];

Nssortdescriptor *sort2=[[nssortdescriptor]initwithkey:@ "Self.card.balance" ascending:yes];

object-c-foundation-Array Sorting