NSArray的排序

最新推荐文章于 2017-10-26 10:03:21 发布

TommyYaphetS

最新推荐文章于 2017-10-26 10:03:21 发布

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分类专栏： iOS OC 文章标签： nsarray 排序

本文链接：https://blog.youkuaiyun.com/hmt20130412/article/details/20449749

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本文介绍了Objective-C中NSArray的四种排序方法：使用内置compare方法、自定义比较方式、使用Block进行排序以及高级排序技巧。通过具体示例展示了如何对字符串数组及自定义对象数组进行有效排序。

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+ (id)studentWithFirstName:(NSString *)firstName lastName:(NSString *)lastName{
    
    Student *stu = [[Student alloc] init];
    
    stu.firstName = firstName;
    stu.lastName = lastName;
    
    return stu;
}

+ (id)studentWithFirstName:(NSString *)firstName lastName:(NSString *)lastName bookName:(NSString *)bookName{

    Student *stu = [Student studentWithFirstName:firstName lastName:lastName];
    
    stu.book = [Book bookWithName:bookName];
    
    return stu;

}

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

- (NSString *)description{

    //return [NSString stringWithFormat:@" %@ %@ %@",self.firstName,self.lastName,self.book.name];
    return [NSString stringWithFormat:@" %@ %@ %@",self.firstName,self.lastName,_book.name];
}


#pragma mark 3.NSArray排序1
void arraySort1(){
    
    NSArray *array = [NSArray arrayWithObjects:@"2",@"3",@"1",@"4", nil];
    
    // 指定系统自带规定的比较方法compare:
    NSArray *array2 = [array sortedArrayUsingSelector:@selector(compare:)];
    NSLog(@"%@",array2);
    
}

#pragma mark 3.NSArray排序2
void arraySort2(){
    
    Student *stu1 = [Student studentWithFirstName:@"hu" lastName:@"mingtao"];
    Student *stu2 = [Student studentWithFirstName:@"zhu" lastName:@"wenpeng"];
    Student *stu3 = [Student studentWithFirstName:@"zhao" lastName:@"weisong"];
    Student *stu4 = [Student studentWithFirstName:@"hu" lastName:@"junpeng"];
    
    NSArray *array = [NSArray arrayWithObjects:stu1,stu2,stu3,stu4, nil];
    
    // 类似JAVA中得compareTo,自己定义比较方式,但是一定要实现compare方法
    NSArray *array2 = [array sortedArrayUsingSelector:@selector(compareStudent:)];
    
    NSLog(@"%@",array2);

}

#pragma mark 3.NSArray排序3-Block排序
void arraySort3(){
    
    Student *stu1 = [Student studentWithFirstName:@"hu" lastName:@"mingtao"];
    Student *stu2 = [Student studentWithFirstName:@"zhu" lastName:@"wenpeng"];
    Student *stu3 = [Student studentWithFirstName:@"zhao" lastName:@"weisong"];
    Student *stu4 = [Student studentWithFirstName:@"hu" lastName:@"junpeng"];
    
    NSArray *array = [NSArray arrayWithObjects:stu1,stu2,stu3,stu4, nil];
    
    NSArray *array2 = [array sortedArrayUsingComparator:^NSComparisonResult(Student *obj1, Student *obj2) {
        NSComparisonResult result = [obj1.firstName compare:obj2.firstName];
        
        if (result == NSOrderedSame) {
            result = [obj1.lastName compare:obj2.lastName];
        }
        
        return result;
    }];
    
    NSLog(@"%@",array2);

    
}

#pragma mark 4.NSArray排序4-高级排序
void arraySort4(){
    
    Student *stu1 = [Student studentWithFirstName:@"hu" lastName:@"mingtao" bookName:@"lianai"];
    Student *stu2 = [Student studentWithFirstName:@"zhu" lastName:@"wenpeng" bookName:@"tianshi"];
    Student *stu3 = [Student studentWithFirstName:@"zhao" lastName:@"weisong" bookName:@"love"];
    Student *stu4 = [Student studentWithFirstName:@"hu" lastName:@"junpeng" bookName:@"qingren"];
    
    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.先按照姓进行排序
    NSSortDescriptor *firstNameDesc = [NSSortDescriptor sortDescriptorWithKey:@"firstName" ascending:YES];
    // 3.先按照名进行排序
    NSSortDescriptor *lastNameDesc = [NSSortDescriptor sortDescriptorWithKey:@"lastName" ascending:YES];

    NSArray *array2 = [array sortedArrayUsingDescriptors:[NSArray arrayWithObjects:bookNameDesc,firstNameDesc,lastNameDesc, nil]];
    
    NSLog(@"%@",array2);
    
    
}