16.Object－C－－NSArray数组的排序

 1 #pragma mark 数组排序 sortedArrayUsingSelector
 2 
 3 void arraySort1()  4 {  5     NSArray *array = [NSArray arrayWithObjects:@"6",@"9",@"1",@"2",nil];  6     //返回一个排好序的数组，原来的数组不会变 （SEL）中传递的是排序的规则。@selector(compare:)  7     //制定元素的比较方法 compare
 8     NSArray *arrayNew = [array sortedArrayUsingSelector:@selector(compare:)];  9     NSLog(@"arrayNew :%@",arrayNew); 10 }

 1 #import 
 2 @class Book;  3 @interface Student : NSObject  4 @property(nonatomic,retain)NSString *firstName;  5 @property(nonatomic,retain)NSString *lastName;  6 @property(nonatomic,retain)Book *book;  7 //快速创建student
 8 + (id)studentWithFirstName:(NSString*)firstName lastName:(NSString*)lastName;  9 //比较规则
10 - (NSComparisonResult)compareStudent:(Student*)stu; 11 @end
12 
13 #import "Student.h"
14 #import "Book.h"
15 @implementation Student 16 + (id)studentWithFirstName:(NSString*)firstName lastName:(NSString*)lastName 17 { 18     //类方法自动释放所以使用autorelease
19     Student *stu = [[[Student alloc]init]autorelease]; 20     stu.firstName = firstName; 21     stu.lastName = lastName; 22     return stu; 23 } 24 
25 - (NSComparisonResult)compareStudent:(Student*)stu 26 { 27     //1.先按照姓排序
28     NSComparisonResult result = [self.lastName compare:stu.lastName]; 29     
30     if(result == NSOrderedSame) 31  { 32         result = [self.firstName compare:stu.firstName]; 33  } 34     return result; 35 } 36 - (NSString *)description 37 { 38     return  [NSString stringWithFormat:@"[%@ %@]",self.lastName,self.firstName]; 39 } 40 
41 - (void)dealloc 42 { 43  [_book release]; 44  [_firstName release]; 45  [_lastName release]; 46  [super dealloc]; 47 } 48 @end
49 
50 
51 #pragma mark 数组排序 arraySort2
52 void arraySort2() 53 { 54     Student *stu = [Student studentWithFirstName:@"QY" lastName:@"Ma"]; 55     Student *stu1 = [Student studentWithFirstName:@"jf" lastName:@"Jia"]; 56     Student *stu2 = [Student studentWithFirstName:@"sy" lastName:@"Qu"]; 57     NSArray *array = [NSArray arrayWithObjects:stu,stu1,stu2,nil]; 58     //指定排序的方法
59     NSArray *arrayNew = [array sortedArrayUsingSelector:@selector(compareStudent:)]; 60     NSLog(@"arrayNew : %@",arrayNew); 61 
62 }

 1 void arraySort3()  2 {  3     Student *stu = [Student studentWithFirstName:@"QY" lastName:@"Ma"];  4     Student *stu1 = [Student studentWithFirstName:@"jf" lastName:@"Jia"];  5     Student *stu2 = [Student studentWithFirstName:@"sy" lastName:@"Qu"];  6     NSArray *array = [NSArray arrayWithObjects:stu,stu1,stu2,nil];  7     //利用block进行排序
 8     NSArray *arrayNew =   [array sortedArrayUsingComparator:^NSComparisonResult(Student *obj1, Student *obj2) {  9         //1.先按照姓排序
10         NSComparisonResult result = [obj1.lastName compare:obj2.lastName]; 11         
12         if(result == NSOrderedSame) 13  { 14             result = [obj1.firstName compare:obj2.firstName]; 15  } 16         return result; 17  }]; 18     NSLog(@"arrayNew : %@",arrayNew); 19 }

 1 //Book
 2 #import 
 3 
 4 @interface Book : NSObject  5 @property(nonatomic,retain)NSString *name;  6 + (id)bookWithName:(NSString*)name;  7 @end
 8 
 9 #import "Book.h"
 10 
 11 @implementation Book  12 + (id)bookWithName:(NSString*)name  13 {  14     Book *book = [[[Book alloc]init]autorelease];  15     book.name = name;  16     return book;  17     
 18 
 19 }  20 - (void)dealloc  21 {  22  [_name release];  23  [super dealloc];  24 }  25 @end
 26 
 27 //Student
 28 #import 
 29 @class Book;  30 @interface Student : NSObject  31 @property(nonatomic,retain)NSString *firstName;  32 @property(nonatomic,retain)NSString *lastName;  33 @property(nonatomic,retain)Book *book;  34 //快速创建student
 35 + (id)studentWithFirstName:(NSString*)firstName lastName:(NSString*)lastName;  36 //快速创建student
 37 + (id)studentWithFirstName:(NSString*)firstName lastName:(NSString*)lastName bookName:(NSString*)bookName;  38 //比较规则
 39 - (NSComparisonResult)compareStudent:(Student*)stu;  40 @end
 41 
 42 #import "Student.h"
 43 #import "Book.h"
 44 @implementation Student  45 + (id)studentWithFirstName:(NSString*)firstName lastName:(NSString*)lastName  46 {  47     //类方法自动释放所以使用autorelease
 48     Student *stu = [[[Student alloc]init]autorelease];  49     stu.firstName = firstName;  50     stu.lastName = lastName;  51     return stu;  52 }  53 
 54 
 55 //快速创建student
 56 + (id)studentWithFirstName:(NSString*)firstName lastName:(NSString*)lastName bookName:(NSString*)bookName  57 {  58     Student *stu = [Student studentWithFirstName:firstName lastName:lastName];  59     stu.book = [Book bookWithName:bookName];  60     return stu;  61 
 62 }  63 - (NSComparisonResult)compareStudent:(Student*)stu  64 {  65     //1.先按照姓排序
 66     NSComparisonResult result = [self.lastName compare:stu.lastName];  67     
 68     if(result == NSOrderedSame)  69  {  70         result = [self.firstName compare:stu.firstName];  71  }  72     return result;  73 }  74 - (NSString *)description  75 {  76     return  [NSString stringWithFormat:@"[%@ %@ %@]",self.lastName,self.firstName,self.book.name];  77 }  78 
 79 - (void)dealloc  80 {  81  [_book release];  82  [_firstName release];  83  [_lastName release];  84  [super dealloc];  85 }  86 @end
 87 
 88 //将排序描述按照顺序存入到数组中
 89 #pragma mark 数组排序 sortedArrayUsingDescriptors 排序描述器
 90 void arraySort5()  91 {  92     Student *stu1 = [Student studentWithFirstName:@"QY" lastName:@"Ma" bookName:@"book3"];  93     Student *stu2 = [Student studentWithFirstName:@"JF" lastName:@"Jia" bookName:@"book1"];  94     Student *stu3 = [Student studentWithFirstName:@"SY" lastName:@"Qu" bookName:@"book4"];  95     NSArray *array = [NSArray arrayWithObjects:stu1,stu2,stu3, nil];  96     //放入到描述器里面
 97     NSSortDescriptor *bookNameDesc = [NSSortDescriptor sortDescriptorWithKey:@"book.name" ascending:YES];  98     NSSortDescriptor *lastNameDesc = [NSSortDescriptor sortDescriptorWithKey:@"lastName" ascending:YES];  99     NSSortDescriptor *firstName = [NSSortDescriptor sortDescriptorWithKey:@"firstName" ascending:YES]; 100     NSArray *array1 = [NSArray arrayWithObjects:bookNameDesc,lastNameDesc,firstName,nil]; 101     NSArray *arrayNew = [array sortedArrayUsingDescriptors:array1]; 102     NSLog(@"arrayNew :%@",arrayNew); 103 
104 }