Objective-c Sortusingselector method

Today we learn two methods, one is to sort the string, and the other is to sort the number of constants.

Create a person class, and in the Person.h file, set the instance initialization and the setter getter method to also declare the sorted method in the Person.h file.

#import <Foundation/Foundation.h>

@interface Person: nsobject

1. set three instances name sex age

{

nsstring *_name;

nsstring *_sex;

Nsinteger _age;

}

2. Specify initialization

-(ID) initwithname: (nsstring *) name

Sex: (nsstring *) Sex

Age: (Nsinteger) age;

3.setter Getter Method

-(void) SetName: (nsstring *) name;

-(NSString *) name;

-(void) Setsex: (nsstring *) sex;

-(NSString *) sex;

-(void) Setage: (nsinteger) age;

-(Nsinteger) age;

4. Declaring a method that is sorted by name

-(Nscomparisonresult) Comparebynamewithotherperson: (Person*) Anotherperson;

5. Declaring an age-ordered approach

-(Nscomparisonresult) Comparebyagewithotherperson: (person*) Anotherperson;

6. Declare a description

-(NSString *) description;

@end

The implementation of the method in the PERSON.M

After declaring it in the Person.h file, copy the 2.3.4.5.6 down to the person.m file for implementation.

#import "Person.h"

@implementation Person

2. Specify initialization

-(ID) initwithname: (nsstring *) name

Sex: (nsstring *) Sex

Age: (Nsinteger) age

{

Self = [super Init];

if (self) {

_name = name;

_sex = sex;

_age = age;

}

return self;

}

3.setter Getter Method

-(void) SetName: (nsstring *) name

{

_name = name;

}

-(NSString *) name

{

return _name;

}

-(void) Setsex: (nsstring *) Sex

{

_sex = sex;

}

-(NSString *) Sex

{

return _sex;

}

-(void) Setage: (nsinteger) Age

{

_age = age;

}

-(Nsinteger) age

{

return _age;

}

4. Declaring a method that is sorted by name

-(Nscomparisonresult) Comparebynamewithotherperson: (Person*) Anotherperson

{

if ([Self. Name Compare:anotherperson. Name] > 0) {

return nsordereddescending;

}Else if ([self]. Name Compare:anotherperson. Name] < 0)

{

return nsorderedascending;

}

return nsorderedsame;

}

5. Declaring an age-ordered approach

-(Nscomparisonresult) Comparebyagewithotherperson: (person*) Anotherperson

{

if (self. Age > Anotherperson. Age ) {

return nsordereddescending;

}Else if (self. Age < Anotherperson. Age )

{

return nsorderedascending;

}

return nsorderedsame;

}

6. Declare a description

-(NSString *) Description

{

return [nsstring stringwithformat: @ "name:%@, Sex:%@, age:%ld",_name,_sex ,_age];

}

@end

method declaration and implementation, we will jump to the main function to invoke the method

#import <Foundation/Foundation.h>

#import "Person.h"

int main (int argc, const char * argv[])

{

@autoreleasepool {

7. Create 4 objects

Person *obj1 = [[Person alloc] initwithname:@ ' Jack ' sex:@ ' male ' age :];

Person *obj2 = [[Person alloc] initwithname:@ ' Henry ' sex:@ ' male ' age: [];

Person *obj3 = [[Person alloc] initwithname:@ "Elyse" sex:@ "female" Age:+];

Person *obj4 = [[Person alloc] initwithname:@ ' Lisa ' sex:@ ' female ' age: ];

Nsmutablearray *array = [[Nsmutablearray alloc] initwithobjects: obj1,obj2,obj3,obj4, Nil ];

8. array sorted by name

[Array sortusingselector:@selector (Comparebynamewithotherperson:)];

//Call Comparebyname This method , at run time , will first jump to Person.h , see if there is no this method , found , will jump to PERSON.M , run the method , and then jump to the main function and display the results .

NSLog (@ "%@", array);

9. array sorted by age

[Array sortusingselector:@selector (Comparebyagewithotherperson:)];

//Call Comparebyage This method , in the run time , will first jump to Person.h , see if there is this method , found , will jump to person.m , run the method , and then jump to the main function and display the results .

NSLog (@ "%@", array);

}

return 0;

}

This time the main is to sort the string and constant number of the master, should be used in the future, so the method to remember!

Objective-c Sortusingselector method