Nsarary Custom Object Sort Nscomparator, compare

Reference from:http://mobile.51cto.com/hot-434804.htm

1. Building the Person class

Person.h

@interface Person:nsobject@property (nonatomic, copy) NSString *name; @property (nonatomic, copy) NSString *surname; @pro Perty (nonatomic, strong) NSDate *dateofbirth; @end

2. Initialize the Objsort object sorting function, including a nsarray array, the array element is a custom person

ObjSort.h

/** * Nsarray Custom Object Sort class */@interface objsort:nsobject-(void) Personssort_nscomparator;//nscomparator comparator @end

Objsort.m

@interface Objsort () @property (nonatomic, strong) Nsmutablearray *personobjs;// An array that stores several person class objects @end@implementation objsort/** * Initialize the object * Initializes the initial contents of the Nsmutablearray array personobjs, wraps the Person class object */-(    Instancetype) init{self = [super init];    if (self = = nil) {return nil;    } nsdateformatter *formatter = [[NSDateFormatter alloc] init];        [Formatter setdateformat:@ "dd/mm/yyyy"];    Person *person[5];    for (int i=0, i<5; i++) {person[i] = [[Person alloc] init];    } person[0].name = @ "Smith";    Person[0].surname = @ "John";        Person[0].dateofbirth = [Formatter datefromstring:@ "03/01/1984"];    Person[1].name = @ "Andersen";    Person[1].surname = @ "Jane";        Person[1].dateofbirth = [Formatter datefromstring:@ "16/03/1979"];    Person[2].name = @ "Clark";    Person[2].surname = @ "Anne";        Person[2].dateofbirth = [Formatter datefromstring:@ "13/09/1995"];    Person[3].name = @ "Smith";    Person[3].surname = @ "David"; Person[3].dateofbirth = [ForMatter datefromstring:@ "19/07/1981";    Person[4].name = @ "Johnson";    Person[4].surname = @ "Rose";    Person[4].dateofbirth = [Formatter datefromstring:@ "22/02/1989"];    if (_personobjs==nil) {_personobjs = [[Nsmutablearray alloc] initwithcapacity:5];    } for (int i=0; i<5; i++) {[_personobjs addobject:person[i]];    } [self SHOWPERSONS:_PERSONOBJS]; return self;}        /** * Log Print output current Nsarray content */-(void) Showpersons: (Nsarray *) array{person *person;    if (_personobjs = = nil) {NSLog (@ "nil");        } for (int i =0; i< [array Count], i++) {person = [array objectatindex:i];            if ([Person Iskindofclass:[person class]]) {NSLog (@ "---person%d---", i);            NSLog (@ "Name:%@", person.name);            NSLog (@ "Surname:%@", person.surname);        NSLog (@ "dateOfBirth:%@", Person.dateofbirth); } else{NSLog (@ "object in Personobjs was not the person class Object.");}}
NSLog (@ "All person print over.\n\n");}

Method One: Nscomparator block + Nsarray's Sortedarrayusingselector

Implement the method in Objsort Personssort_nscomparator

/** * Sorting method using nscomparator comparison */-(void) personssort_nscomparator{        nscomparator sortblock = ^ (person *p1, person *p2) { C1/>nscomparisonresult r1 = [P1.name compare:p2.name];        if (r1! = nsorderedsame) {            return r1;        } else {            Nscomparisonresult r2 = [P1.surname compare:p2.surname];            if (r2! = nsorderedsame)                return R2;            else                return [P1.dateofbirth Compare:p2.dateOfBirth];        }    ;    Nsarray *personlist = [Self.personobjs sortedarrayusingcomparator:sortblock];    Nsarray *personlist = [Self.personobjs sortedarrayusingselector: @selector (compare:)];    [Self showpersons:personlist];}

Method Two: Using the object's custom method compare:

Add in PERSON.M

-(Nscomparisonresult) Compare: (Person *) otherperson{    nscomparisonresult r1 = [Self.name compare:otherPerson.name ];    if (r1! = nsorderedsame) {        return r1;    } else {        Nscomparisonresult r2 = [Self.surname compare:otherPerson.surname];        if (r2! = nsorderedsame)            return R2;        else            return [Self.dateofbirth Compare:otherPerson.dateOfBirth];    }    return [Self.name compare:otherPerson.name];}

Add in OBJSORT.M

/** * Use custom object Custom Function compare for Nsarray sort */-(void) personssort_customcompare{nsarray *personlist    = [Self.personobjs Sortedarrayusingselector: @selector (compare:)];    [Self showpersons:personlist];}

Add a response interface in ObjSort.h

/** * Nsarray Custom Object Sort class */@interface objsort:nsobject-(void) Personssort_nscomparator;//nscomparator comparator-(void) personssort_customcompare;//Object Custom Comparison method Compare@end

Finally, at main.m (sort call), add the

        Objsort *objsort = [[Objsort alloc] init];        [Objsort Personssort_nscomparator];

Method One result

---person0---Name:SmithSurname:JohnDateOfBirth:1984- on- Geneva  -:xx:xx+0000---person1---Name:AndersenSurname:JaneDateOfBirth:1979-Geneva- the  -:xx:xx+0000---person2---Name:ClarkSurname:AnneDateOfBirth:1995- the- A  -:xx:xx+0000---person3---Name:SmithSurname:DavidDateOfBirth:1981- -- -  -:xx:xx+0000---person4---Name:JohnsonSurname:RoseDateOfBirth:1989- Geneva- +  -:xx:xx+0000All is print over.---person0---Name:AndersenSurname:JaneDateOfBirth:1979-Geneva- the  -:xx:xx+0000---person1---Name:ClarkSurname:AnneDateOfBirth:1995- the- A  -:xx:xx+0000---person2---Name:JohnsonSurname:RoseDateOfBirth:1989- Geneva- +  -:xx:xx+0000---person3---Name:SmithSurname:DavidDateOfBirth:1981- -- -  -:xx:xx+0000---person4---Name:SmithSurname:JohnDateOfBirth:1984- on- Geneva  -:xx:xx+0000All is print over.

Method Two Results

---person0---Name:SmithSurname:JohnDateOfBirth:1984- on- Geneva  -:xx:xx+0000---person1---Name:AndersenSurname:JaneDateOfBirth:1979-Geneva- the  -:xx:xx+0000---person2---Name:ClarkSurname:AnneDateOfBirth:1995- the- A  -:xx:xx+0000---person3---Name:SmithSurname:DavidDateOfBirth:1981- -- -  -:xx:xx+0000---person4---Name:JohnsonSurname:RoseDateOfBirth:1989- Geneva- +  -:xx:xx+0000All is print over.---person0---Name:AndersenSurname:JaneDateOfBirth:1979-Geneva- the  -:xx:xx+0000---person1---Name:ClarkSurname:AnneDateOfBirth:1995- the- A  -:xx:xx+0000---person2---Name:JohnsonSurname:RoseDateOfBirth:1989- Geneva- +  -:xx:xx+0000---person3---Name:SmithSurname:DavidDateOfBirth:1981- -- -  -:xx:xx+0000---person4---Name:SmithSurname:JohnDateOfBirth:1984- on- Geneva  -:xx:xx+0000All is print over.

Nsarary Custom Object Sort Nscomparator, compare