[OC Foundation框架 - 8] NSArray排序

1.派生

 voidarrayNew()
 {
    NSArray*array = [NSArrayarrayWithObjects:@"",@"",nil];
    NSArray*array2 = [arrayarrayByAddingObject:@""];
    NSLog(@"%@", array2);

    NSArray*array4 = [NSArrayarrayWithObjects:@"",@"",@"",nil];
    NSRangerange =NSMakeRange(,);
    NSArray*array5 = [array4subarrayWithRange:range];
    NSLog(@"%@", array5);
 }

 

2.IO文件读写

需要符合XML格式

(1)写入文件

 voidarrayOther()
 {
     NSArray *array = [NSArray arrayWithObjects:@"",@"",@"",@"",nil];
     NSString *str = [array componentsJoinedByString:@","];
     NSLog(@"%@", str);

     [array writeToFile:@"/Users/hellovoidworld/Study/Foundation/NSArray2/array.txt"atomically:YES];
 }

 

(2)读取文件

 voidarrayOther()
 {
    NSArray*array = [NSArrayarrayWithObjects:@"",@"",@"",@"",nil];
    NSString*str = [arraycomponentsJoinedByString:@","];
    NSLog(@"%@", str);

 //    [array writeToFile:@"/Users/hellovoidworld/Study/Foundation/NSArray2/array.txt" atomically:YES];

    NSString*path =@"/Users/hellovoidworld/Study/Foundation/NSArray2/array.txt";
    NSArray*array2 = [NSArrayarrayWithContentsOfFile:path];
    NSLog(@"%@", array2);
 }

 

3.数组排序

（1）指定元素的排序方法进行排序

         // 默认的排序方法
         NSArray *array = @[@"b", @"d", @"a", @"z"];
         NSLog(@"排序前 %@", array);

         NSArray *array2 = [array sortedArrayUsingSelector:@selector(compare:)];
         NSLog(@"排序后 %@", array2);

         // 使用block排序
         NSArray *array3 = @[@"z", @"", @"b", @"", @"x"];
         NSArray *array4 = [array3 sortedArrayUsingComparator:^NSComparisonResult(id obj1, id obj2)
         {
             return [obj1 compare:obj2];
         }];
         NSLog(@"使用block排序后 %@", array4);

 

（2）对自定义类型进行排序

Student.m

 @implementationStudent

 + (Student*) initWithFirstName:(NSString*) firstName withLastName:(NSString*) lastName
 {
    Student*stu =  [[[Studentalloc]init]autorelease];
     stu.firstName  = firstName;
     stu.lastName= lastName;
    returnstu;
 }

 - (void)dealloc
 {
     [_firstNamerelease];
     [_lastNamerelease];
     [superdealloc];
 }

 - (NSComparisonResult)compareStudent:(Student*) stu
 {
    NSComparisonResultresult =  [self.lastNamecompare: stu.lastName];
    if(result ==NSOrderedSame)
     {
         result = [self.firstNamecompare:stu.firstName];
     }

    returnresult;
 }

main.m

 - (NSString*) description
 {
    return[NSStringstringWithFormat:@"[%@-%@]",self.firstName,self.lastName];
 }

 @end

 voidarraySort2()
 {
     Student *stu1 = [Student initWithFirstName:@"Sinon"withLastName:@"Huang"];
     Student *stu2 = [Student initWithFirstName:@"Franky"withLastName:@"Xie"];
     Student *stu3 = [Student initWithFirstName:@"Mon"withLastName:@"Yao"];
     Student *stu4 = [Student initWithFirstName:@"JJ"withLastName:@"Deng"];

     NSArray *array = [NSArray arrayWithObjects:stu1, stu2, stu3, stu4,nil];
     NSArray *array2 = [array sortedArrayUsingSelector:@selector(compareStudent:)];
     NSLog(@"%@", array2);
 }

 

（3）使用block进行排序

 voidarraySort3()
 {
    Student*stu1 = [StudentinitWithFirstName:@"Sinon"withLastName:@"Huang"];
    Student*stu2 = [StudentinitWithFirstName:@"Franky"withLastName:@"Xie"];
    Student*stu3 = [StudentinitWithFirstName:@"Mon"withLastName:@"Yao"];
    Student*stu4 = [StudentinitWithFirstName:@"JJ"withLastName:@"Deng"];

    NSArray*array = [NSArrayarrayWithObjects:stu1, stu2, stu3, stu4,nil];
    NSArray*array2 = [arraysortedArrayUsingComparator:^NSComparisonResult(Student*obj1,Student*obj2) {
        NSComparisonResultresult =  [obj1.lastNamecompare: obj2.lastName];
        if(result ==NSOrderedSame)
         {
             result = [obj1.firstNamecompare:obj2.firstName];
         }

        returnresult;
     }];

    NSLog(@"%@", array2);
 }

 

（4）使用描述器进行排序

 voidarraySort4()
 {
    Student*stu1 = [StudentinitWithFirstName:@"Sinon"withLastName:@"Huang"withBook:[BookbookWithName:@"Jave Programming"]];
    Student*stu2 = [StudentinitWithFirstName:@"Franky"withLastName:@"Xie"withBook:[BookbookWithName:@"Cook"]];
    Student*stu3 = [StudentinitWithFirstName:@"Mon"withLastName:@"Yao"withBook:[BookbookWithName:@"History"]];
    Student*stu4 = [StudentinitWithFirstName:@"JJ"withLastName:@"Deng"withBook:[BookbookWithName:@"Biographic"]];

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

    NSSortDescriptor*desc1 = [NSSortDescriptorsortDescriptorWithKey:@"book.name"ascending:YES];
    NSSortDescriptor*desc2 = [NSSortDescriptorsortDescriptorWithKey:@"lastName"ascending:YES];
    NSSortDescriptor*desc3 = [NSSortDescriptorsortDescriptorWithKey:@"firstName"ascending:YES];

    NSArray*array2 = [arraysortedArrayUsingDescriptors:[NSArrayarrayWithObjects:desc1, desc2, desc3,nil]];

    NSLog(@"%@", array2);

 }