NSArray的排序

NSArray 派生出新的集合

-(NSArray *)arrayByAddingObject:(id)anObject

//add a new array,and return a new NSArray

-(NSArray *)arrayByAddingObjectsFromArray:(NSArray *)anotherarray

//add all the elements inanother array and return a new nsarray original array not change

-(NSArray *)subarrayWithRange:(NSArray) range

//load elements within range


#pragma 派生出新的数组

void arrayNew(){

NSArray *array=[NSArray arrayWithObjects:@"1",@"2",nil];

NSArray *array2=[arrayarrayByAddingObject:@"3"];//合并数组

//原来的array没有变,只是返回的array2变化了

NSArray *array3=[arrayarrayByAddingObjectsFromArray:[NSArray arrayWithObject:@"4",@"5",nil]];//4 elements

NSArray *array4=[array arrayWithObjects:@"1",@"2",@"3",@"4",nil];

NSRange range= NSMakeRange(1,2);

NSArray *array5=[array4 subarrayWithRange:range];

}


Other method.

-(NSString)componentsJoinedByString:(NSString *)seperator

//Use a seperator to joint all the elements as a string

//用一个分隔符将数组中的所有元素拼接成一个字符串

-(BOOL)write To File:(NSString *)path atomically:(BOOL)use AuxiliaryFile

//将一个NSArray持久化到文件中去


#pregma mark other method

void arrayOther(){

NSArray *array=[array arrayWithObjects:@"1",@"2",@"3",@"4",nil];

NSString *string=[array componentsJoinedByString:@","];// 1,2,3,4

NSString *path=@"/Users/apple/Desktop/array.xml";

[arry writeToFile:path atomically:YES];//create a xml file

//从文件中读取数组内容(文件有严格的格式要求)

NSString *path=@"/Users/apple/Desktop/array.txt";

NSArray *array2=[NSArray arrayWithContentsOfFile:path];

}


NSArray 排序1

-(NSArray *)sortedArrayUsingSelector:(SEL)comparator

//return a new sorted array ,original array will not change


#pragma mark arraysort

void arraySort1(){

NSArray *array=[array arrayWithObjects:@"2",@"3",@"1",@"4",nil];

NSArray *array2=[array sortedArrayUsingSelector:@selector(compare:)];

// [@"1" compare:@"2"]; 按照传入的比较方法进行排序

//Default order is from smaller to bigger

}


NSArray 排序2

//例如这样调用(假设array里面装着Student对象);

-(NSArray *)sortedArrayUsingComparator:(comparator)cmptr

//typedef NSComoarisionResult (^NSComparator)(id obj1,id obj2);

//[array sortedArrayUsingComparatorResult:^(Student *s1,Student *s2){

return [s1.name compare:s2.name;]

}];

//按照name排序

Student.h

@interface Student:NSObject

@property(nonatomic,retain)NSString *firstname;

@property(nonatomic,retain)NSString *lastname;

+(id)studentWithFirstName:(NSString *)firstname lastname:(*NSString *)lastname;

//Pass to @selector and return value must be NSComparisionResult

-(NSComparisionResult)compareStudent:(Student *)stu;

@end

Student.m

@implementation

+(id)studentWithFiestName:(NSString *)firstname lastname:(*NSString *)lastname{

Student *stu=[[[Student alloc]init]autorelease];

//because of static method + so we need to add autorelease.

stu.lastname=lastname;

stu.firstname=firstname;

return stu;

}

//We can store lastname reult first

-(NSComparisionResult)compareStudent:(Student *)stu{

//first sort with lastname then firstname

NSComparisionResult result=[self.lastname compare:stu.lastname];

//if has same lastname then compare the firstname

if(result==NSOrderSame){

result=[self.firstname compare:stu.firstname];

}

return result;

}

}

-(void)dealloc{

[_firstname release];

[_lastname release];

[super dealloc];

}

//Rewrite description method

//Yesi

-(NSString *)description{

return [NSString stringWithFormat:@"[%@ %@]",self.lastname,self.firstname];

}

@end

-----------------------

#progma mark 数组排序2

#import "Student.h"

void arraySort2(){

Student *stu1=[Student studentWithFirstname::@"Yesi" lastname:@“Huang”];

Student *stu2=[Student studentWithFirstname::@"jujubee" lastname:@“Sharma”];

Student *stu3=[Student studentWithFirstname::@"hitu" lastname:@”Sharma”];

Student *stu4=[Student studentWithFirstname::@"madani"  lastname:@”Green”];

NSArray *array=[NSArray arrayWithObjects:stu1,stu2,stu3,stu4,nil];

//now need to sort with firstname then lastname

NSArray *array2=[array sortedArrayUsingSelector:@selctor(compareStudent)];

}


//NSArray排序3 利用block (block完全没懂好么,roleback to see again)

#pragma  mark Using block to sort

#import "Student.h"

void arraySort3(){

Student *stu1=[Student studentWithFirstname::@"Yesi" lastname:@“Huang”];

Student *stu2=[Student studentWithFirstname::@"jujubee" lastname:@“Sharma”];

Student *stu3=[Student studentWithFirstname::@"hitu" lastname:@”Sharma”];

Student *stu4=[Student studentWithFirstname::@"madani"  lastname:@”Green”];

NSArray *array=[NSArray arrayWithObjects:stu1,stu2,stu3,stu4,nil];

//Using a block to compare

NSArray *araray2=[array sortedArrayUsingComparator:^NSComparisonResult(Student *obj1,Student *obj2){

//copy algorithm here...double click can add a block quickly

//first sort with lastname then firstname

NSComparisionResult result=[obj1.lastname compare:obj2.lastname];

//if has same lastname then compare the firstname

if(result==NSOrderSame){

result=[obj1.firstname compare:obj2.firstname];

}

return result;

}];

NSLog(@”array2:%@”,array2);

}


32.17

//NSArray排序4  Student has a subclass book

//sort first with bookname then lastname then firstname

#pragma  mark Using block to sort

Book.h

@interface Book:NSObject

@property (nonatomic,retain) NSString *name;

+(id)bookWithName:(NSString *)name;

@end

Book.m

@implementation Book

+(id)bookWithName:(NSString *name){

Book *book=[[[Book alloc]init]autorelease];

book.name=name;

return book;

}

-(void)dealloc{

[_name release];

[super dealloc];

}

@end

----------------------

Student.h   //add

@class Book;

@property (nonatomic,retain) Book *book;

+(id)studentWithFirstName:(NSString *)firstname lastname:(NSString *)lastname bookName:(NString *)bookname;

Student.m//add

+(id)studentWithFirstName:(NSString *)firstname lastname:(NSString *)lastname bookName:(NString *)bookname{

Student *stu=[Student studentWithFirstname:firstname lastname:lastname];

stu.book=[Book bookWithName:bookname];//no memory leak

return stu;

}

Student.m//add

#import "Book.h"

-(void)dealloc{

[_firstname release];

[_lastname release];

[_book release];

[super dealloc];

}

---------------------

void arrarSort4(){

Student *stu1=[Student studentWithFirstname::@"Yesi" bookName:@"book1"];

Student *stu2=[Student studentWithFirstname::@"jujubee"  bookName:@"book2"];

Student *stu3=[Student studentWithFirstname::@"hitu"  bookName:@"book2"];

Student *stu4=[Student studentWithFirstname::@"madani"  bookName:@"book1"];

NSArray *array=[NSArray arrayWithObjects:stu1,stu2,stu3,stu4,nil];

//1先按照书名进行排序

NSSortDescriptor *bookNameDesc=[NSSortDescriptor sortDescriptorWithKey:@"book.name" ascending:YES];

//2再按照姓

NSSortDescriptor *lastameDesc=[NSSortDescriptor sortDescriptorWithKey:@"lastname" ascending:YES];

//3最后按照名字

NSSortDescriptor *firstnameDesc=[NSSortDescriptor sortDescriptorWithKey:@"firstname" ascending:YES];

NSArray array2=[array sortedArrayUsingDescriptors:]

}

NSArray 派生出新的集合

-(NSArray *)arrayByAddingObject:(id)anObject

//add a new array,and return a new NSArray

-(NSArray *)arrayByAddingObjectsFromArray:(NSArray *)anotherarray

//add all the elements inanother array and return a new nsarray original array not change

-(NSArray *)subarrayWithRange:(NSArray) range

//load elements within range


#pragma 派生出新的数组

void arrayNew(){

NSArray *array=[NSArray arrayWithObjects:@"1",@"2",nil];

NSArray *array2=[array arrayByAddingObject:@"3"];//合并数组

//原来的array没有变,只是返回的array2变化了

NSArray *array3=[array arrayByAddingObjectsFromArray:[NSArray arrayWithObject:@"4",@"5",nil]];//4 elements

NSArray *array4=[array arrayWithObjects:@"1",@"2",@"3",@"4",nil];

NSRange range= NSMakeRange(1,2);

NSArray *array5=[array4 subarrayWithRange:range];

}


Other method.

-(NSString)componentsJoinedByString:(NSString *)seperator

//Use a seperator to joint all the elements as a string

-(BOOL)write To File:(NSString *)path atomically:(BOOL)use AuxiliaryFile

//讲一个NSArray持久化到文件中去


#pregma mark other method

void arrayOther(){

NSArray *array=[array arrayWithObjects:@"1",@"2",@"3",@"4",nil];

NSString *string=[array componentsJoinedByString:@","];// 1,2,3,4

NSString *path=@"/Users/apple/Desktop/array.xml";

[arry writeToFile:path atomically:YES];//create a xml file

//从文件中读取数组内容(文件有严格的格式要求)

NSString *path=@"/Users/apple/Desktop/array.txt";

NSArray *array2=[NSArray arrayWithContentsOfFile:path];

}


NSArray 排序1

-(NSArray *)sortedArrayUsingSelector:(SEL)comparator

//return a new sorted array ,original array will not change


#pragma mark arraysort

void arraySort1(){

NSArray *array=[array arrayWithObjects:@"2",@"3",@"1",@"4",nil];

NSArray *array2=[array sortedArrayUsingSelector:@selector(compare:)];

// [@"1" compare:@"2"]; 按照传入的比较方法进行排序

//Default order is from smaller to bigger

}


NSArray 排序2

//例如这样调用(假设array里面装着Student对象);

-(NSArray *)sortedArrayUsingComparator:(comparator)cmptr

//typedef NSComoarisionResult (^NSComparator)(id obj1,id obj2);

//[array sortedArrayUsingComparatorResult:^(Student *s1,Student *s2){

return [s1.name compare:s2.name;]

}];

//按照name排序

Student.h

@interface Student:NSObject

@property(nonatomic,retain)NSString *firstname;

@property(nonatomic,retain)NSString *lastname;

+(id)studentWithFiestName:(NSString *)firstname lastname:(*NSString *)lastname;

//Pass to @selector and return value must be NSComparisionResult

-(NSComparisionResult)compareStudent:(Student *)stu;

@end

Student.m

@implementation

+(id)studentWithFiestName:(NSString *)firstname lastname:(*NSString *)lastname{

Student *stu=[[[Student alloc]init]autorelease];

//because of static method + so we need to add autorelease.

stu.lastname=lastname;

stu.firstname=firstname;

return stu;

}

//We can store lastname reult first

-(NSComparisionResult)compareStudent:(Student *)stu{

//first sort with lastname then firstname

NSComparisionResult result=[self.lastname compare:stu.lastname];

//if has same lastname then compare the firstname

if(result==NSOrderSame){

result=[self.firstname compare:stu.firstname];

}

return result;

}

}

-(void)dealloc{

[_firstname release];

[_lastname release];

[super dealloc];

}

//Rewrite description method

//Yesi

-(NSString *)description{

return [NSString stringWithFormat:@"%@ %@",self.lastname,self.firstname];

}

@end

-----------------------

#progma mark 数组排序2

#import "Student.h"

void arraySort2(){

Student *stu1=[Student studentWithFirstname::@"Yesi"];

Student *stu2=[Student studentWithFirstname::@"jujubee"];

Student *stu3=[Student studentWithFirstname::@"hitu"];

Student *stu4=[Student studentWithFirstname::@"madani"];

NSArray *array=[NSArray arrayWithObjects:stu1,stu2,stu3,stu4,nil];

//now need to sort with firstname then lastname

NSArray *array2=[array sortedArrayUsingSelector:@selctor(compareStudent)];

}


//NSArray排序3 利用block (block完全没懂好么,roleback to see again)

#pragma  mark Using block to sort

#import "Student.h"

void arraySort3(){

Student *stu1=[Student studentWithFirstname::@"Yesi"];

Student *stu2=[Student studentWithFirstname::@"jujubee"];

Student *stu3=[Student studentWithFirstname::@"hitu"];

Student *stu4=[Student studentWithFirstname::@"madani"];

NSArray *array=[NSArray arrayWithObjects:stu1,stu2,stu3,stu4,nil];

//Using a block to compare

[array sortedArrayUsingComparator:^NSComparisonResult(Student *obj1,Student *obj2){//copy algorithm here...double click can add a block quickly

//first sort with lastname then firstname

NSComparisionResult result=[obj1.lastname compare:obj2.lastname];

//if has same lastname then compare the firstname

if(result==NSOrderSame){

result=[obj1.firstname compare:obj2.firstname];

}

return result;

}];

}


//NSArray排序4  Student has a subclass book

//sort first with bookname then lastname then firstname

#pragma  mark Using block to sort

Book.h

@interface Book:NSObject

@property (nonatomic,retain) NSString *name;

+(id)bookWithName:(NSString *)name;

@end

Book.m

@implementation Book

+(id)bookWithName:(NSString *name){

Book *book=[[[Book alloc]init]autorelease];

book.name=name;

return book;

}

-(void)dealloc{

[_name release];

[super dealloc];

}

@end

----------------------

Student.h   //add

@class Book;

@property (nonatomic,retain) Book *book;

+(id)studentWithFirstName:(NSString *)firstname lastname:(NSString *)lastname bookName:(NString *)bookname;

Student.m//add

+(id)studentWithFirstName:(NSString *)firstname lastname:(NSString *)lastname bookName:(NString *)bookname{

Student *stu=[Student studentWithFirstname:firstname lastname:lastname];

stu.book=[Book bookWithName:bookname];//no memory leak

return stu;

}

Student.m//add

#import "Book.h"

-(void)dealloc{

[_firstname release];

[_lastname release];

[_book release];

[super dealloc];

}

---------------------

void arrarSort4(){

Student *stu1=[Student studentWithFirstname::@"Yesi" bookName:@"book1"];

Student *stu2=[Student studentWithFirstname::@"jujubee"  bookName:@"book2"];

Student *stu3=[Student studentWithFirstname::@"hitu"  bookName:@"book2"];

Student *stu4=[Student studentWithFirstname::@"madani"  bookName:@"book1"];

NSArray *array=[NSArray arrayWithObjects:stu1,stu2,stu3,stu4,nil];

//1先按照书名进行排序

NSSortDescriptor *bookNameDesc=[NSSortDescriptor sortDescriptorWithKey:@"book.name" ascending:YES];

//2再按照姓

NSSortDescriptor *lastameDesc=[NSSortDescriptor sortDescriptorWithKey:@"lastname" ascending:YES];

//3最后按照名字

NSSortDescriptor *firstnameDesc=[NSSortDescriptor sortDescriptorWithKey:@"firstname" ascending:YES];

NSArray array2=[array sortedArrayUsingDescriptors:]

}

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