Objective C中NSArray数组排序总结(二)
2014-08-04 19:41
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总结OC中数组排序3种方法:sortedArrayUsingSelector:;sortedArrayUsingComparator:;sortedArrayUsingDescriptors:
1、利用block语法(sortedArrayUsingComparator:)
苹果官方提供了block语法,比较方便。其中数组排序可以用sortedArrayUsingComparator:方法,代码如下:
01 void sortArray3(){
02 NSArray *array = [NSArray arrayWithObjects:@"1bc",@"4b6",@"123",@"789",@"3ef", nil];
03 NSArray *sortedArray = [array sortedArrayUsingComparator:^NSComparisonResult(id obj1, id obj2) {
04
05 //这里的代码可以参照上面compare:默认的排序方法,也可以把自定义的方法写在这里,给对象排序
06 NSComparisonResult result = [obj1 compare:obj2];
07 return result;
08 }];
09 NSLog(@"排序后:%@",sortedArray);
10 }
2、高级排序(sortedArrayUsingDescriptors:)
如果是这样一种情况呢?Person类里有另外一个类的变量,比如说Person类除了name,age变量,还有一辆车Car类型,Car类里有个name属性。对Person对象进行排序,有这样的要求:按照Car的name排序,如果是同一辆车,也就是Car的name相同,那么再按照年龄进行排序,如果年龄也相同,最后按照Person的name进行排序。
上面这样就要使用第三种方法,利用排序描述器,不多说,有兴趣可以看看API介绍。代码如下:
首先写个Car类,实现类Car.m代码如下:
01 #import "Car.h"
02 @implementation Car
03
04 +(Car *)initWithName:(NSString *)name{
05 Car *car = [Car alloc] init];
06 car.name = name;
07 return car;
08 }
09
10 @end
然后改写Person类,实现类Person.m代码如下:
01 #import "Person.h"
02 #import "Car.h"
03 @implementation Person
04
05 +(Person *)personWithAge:(int)age withName:(NSString *)name withCar:(Car *)car{
06 Person *person = [[Person alloc] init];
07 person.age = age;
08 person.name = name;
09 person.car = car;
10 return person;
11 }
12
13 //这里重写description方法,用于最后测试排序结果显示
14 -(NSString *)description{
15 return [NSString stringWithFormat:@"age is %zi , name is %@, car is %@",_age,_name,_car.name];
16 }
17
18 @end 主函数代码如下:
01 void sortArray4(){
02 //首先来3辆车,分别是奥迪、劳斯莱斯、宝马
03 Car *car1 = [Car initWithName:@"Audio"];
04 Car *car2 = [Car initWithName:@"Rolls-Royce"];
05 Car *car3 = [Car initWithName:@"BMW"];
06
07 //再来5个Person,每人送辆车,分别为car2、car1、car1、car3、car2
08 Person *p1 = [Person personWithAge:23 withName:@"zhangsan" withCar:car2];
09 Person *p2 = [Person personWithAge:21 withName:@"zhangsan" withCar:car1];
10 Person *p3 = [Person personWithAge:24 withName:@"lisi" withCar:car1];
11 Person *p4 = [Person personWithAge:23 withName:@"wangwu" withCar:car3];
12 Person *p5 = [Person personWithAge:23 withName:@"wangwu" withCar:car2];
13
14
15 //加入数组
16 NSArray *array = [NSArray arrayWithObjects:p1,p2,p3,p4,p5, nil];
17
18 //构建排序描述器
19 NSSortDescriptor *carNameDesc = [NSSortDescriptor sortDescriptorWithKey:@"car.name" ascending:YES];
20 NSSortDescriptor *personNameDesc = [NSSortDescriptor sortDescriptorWithKey:@"name" ascending:YES];
21 NSSortDescriptor *personAgeDesc = [NSSortDescriptor sortDescriptorWithKey:@"age" ascending:YES];
22
23 //把排序描述器放进数组里,放入的顺序就是你想要排序的顺序
24 //我这里是:首先按照年龄排序,然后是车的名字,最后是按照人的名字
25 NSArray *descriptorArray = [NSArray arrayWithObjects:personAgeDesc,carNameDesc,personNameDesc, nil];
26
27 NSArray *sortedArray = [array sortedArrayUsingDescriptors: descriptorArray];
28 NSLog(@"%@",sortedArray);
29 } 结果如下:
从结果看出,先按照age排序,如果age相同,按照car排序,如果car相同,按照name排序。
(注意:上面两种排序方法要想实现字符串显示,请重写description方法)
1、利用block语法(sortedArrayUsingComparator:)
苹果官方提供了block语法,比较方便。其中数组排序可以用sortedArrayUsingComparator:方法,代码如下:
01 void sortArray3(){
02 NSArray *array = [NSArray arrayWithObjects:@"1bc",@"4b6",@"123",@"789",@"3ef", nil];
03 NSArray *sortedArray = [array sortedArrayUsingComparator:^NSComparisonResult(id obj1, id obj2) {
04
05 //这里的代码可以参照上面compare:默认的排序方法,也可以把自定义的方法写在这里,给对象排序
06 NSComparisonResult result = [obj1 compare:obj2];
07 return result;
08 }];
09 NSLog(@"排序后:%@",sortedArray);
10 }
2、高级排序(sortedArrayUsingDescriptors:)
如果是这样一种情况呢?Person类里有另外一个类的变量,比如说Person类除了name,age变量,还有一辆车Car类型,Car类里有个name属性。对Person对象进行排序,有这样的要求:按照Car的name排序,如果是同一辆车,也就是Car的name相同,那么再按照年龄进行排序,如果年龄也相同,最后按照Person的name进行排序。
上面这样就要使用第三种方法,利用排序描述器,不多说,有兴趣可以看看API介绍。代码如下:
首先写个Car类,实现类Car.m代码如下:
01 #import "Car.h"
02 @implementation Car
03
04 +(Car *)initWithName:(NSString *)name{
05 Car *car = [Car alloc] init];
06 car.name = name;
07 return car;
08 }
09
10 @end
然后改写Person类,实现类Person.m代码如下:
01 #import "Person.h"
02 #import "Car.h"
03 @implementation Person
04
05 +(Person *)personWithAge:(int)age withName:(NSString *)name withCar:(Car *)car{
06 Person *person = [[Person alloc] init];
07 person.age = age;
08 person.name = name;
09 person.car = car;
10 return person;
11 }
12
13 //这里重写description方法,用于最后测试排序结果显示
14 -(NSString *)description{
15 return [NSString stringWithFormat:@"age is %zi , name is %@, car is %@",_age,_name,_car.name];
16 }
17
18 @end 主函数代码如下:
01 void sortArray4(){
02 //首先来3辆车,分别是奥迪、劳斯莱斯、宝马
03 Car *car1 = [Car initWithName:@"Audio"];
04 Car *car2 = [Car initWithName:@"Rolls-Royce"];
05 Car *car3 = [Car initWithName:@"BMW"];
06
07 //再来5个Person,每人送辆车,分别为car2、car1、car1、car3、car2
08 Person *p1 = [Person personWithAge:23 withName:@"zhangsan" withCar:car2];
09 Person *p2 = [Person personWithAge:21 withName:@"zhangsan" withCar:car1];
10 Person *p3 = [Person personWithAge:24 withName:@"lisi" withCar:car1];
11 Person *p4 = [Person personWithAge:23 withName:@"wangwu" withCar:car3];
12 Person *p5 = [Person personWithAge:23 withName:@"wangwu" withCar:car2];
13
14
15 //加入数组
16 NSArray *array = [NSArray arrayWithObjects:p1,p2,p3,p4,p5, nil];
17
18 //构建排序描述器
19 NSSortDescriptor *carNameDesc = [NSSortDescriptor sortDescriptorWithKey:@"car.name" ascending:YES];
20 NSSortDescriptor *personNameDesc = [NSSortDescriptor sortDescriptorWithKey:@"name" ascending:YES];
21 NSSortDescriptor *personAgeDesc = [NSSortDescriptor sortDescriptorWithKey:@"age" ascending:YES];
22
23 //把排序描述器放进数组里,放入的顺序就是你想要排序的顺序
24 //我这里是:首先按照年龄排序,然后是车的名字,最后是按照人的名字
25 NSArray *descriptorArray = [NSArray arrayWithObjects:personAgeDesc,carNameDesc,personNameDesc, nil];
26
27 NSArray *sortedArray = [array sortedArrayUsingDescriptors: descriptorArray];
28 NSLog(@"%@",sortedArray);
29 } 结果如下:
从结果看出,先按照age排序,如果age相同,按照car排序,如果car相同,按照name排序。
(注意:上面两种排序方法要想实现字符串显示,请重写description方法)
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