[OC Foundation框架

1.派生

voidarrayNew()
{
   NSArray*array = [NSArrayarrayWithObjects:@"1",@"2",nil];
   NSArray*array2 = [arrayarrayByAddingObject:@"3"];
   NSLog(@"%@", array2);
   
   
   NSArray*array4 = [NSArrayarrayWithObjects:@"1",@"2",@"3",nil];
   NSRangerange =NSMakeRange(1,2);
   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:@"1",@"2",@"3",@"4",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:@"1",@"2",@"3",@"4",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", @"4", @"b", @"3", @"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);
   
}