NSArray 数组排序

1. //方法1,使用自带的比较器

2. //compare是数组自带的比较方法

3. NSArray *array=[NSArray arrayWithObjects:@"3",@"1",@"2", nil];

4. NSArray *array2= [array sortedArrayUsingSelector:@selector(compare:)];

5. NSLog(@"%@",array2);

结果是升序排列

1. //方式二：使用块完成排

2. NSArray *array = [NSArray arrayWithObjects:@"1bc",@"4b6",@"123",@"789",@"3ef", nil];

3. NSArray *sortedArray = [array sortedArrayUsingComparator:^NSComparisonResult(id obj1, id obj2) {

4.            

5. //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

6.    NSComparisonResult result = [obj1 compare:obj2];

7.    return result;

8. }];

9. NSLog(@"排序后:%@",sortedArray);

方法3:自定义排序

1. #import <Foundation/Foundation.h>

3. @interface Person : NSObject

4. @property NSString* name;

5. @property int age;

7. -(id)initWithNameAndAge:(NSString*) aName and:(int) aAge;

8. -(NSComparisonResult)comparePersonByAge:(Person *)person;

9. -(NSComparisonResult)comparePersonByName:(Person *)person;

10. @end

1. #import "Person.h"

3. @implementation Person

4. @synthesize name,age;

5. -(id)initWithNameAndAge:(NSString*) aName and:(int) aAge{

6.    if (self=[super init]) {

7.        

8.        name=aName;

9.        age=aAge;

10.        

11.    }

12.    return self;

13. }

15. //自定义排序方法

16. -(NSComparisonResult)comparePersonByAge:(Person *)person{

17.    //默认按年龄排序

18.    NSComparisonResult result = [[NSNumber numberWithInt:person.age] compare:[NSNumber numberWithInt:self.age]];//注意:基本数据类型要进行数据转换

19.    //如果年龄一样，就按照名字排序

20.    //if (result == NSOrderedSame) {

21.    //    result = [self.name compare:person.name];

22.    //}

23.    return result;

24. }

26. -(NSComparisonResult)comparePersonByName:(Person *)person{

27.    //默认按年龄排序

28.    NSComparisonResult result = [ person.name compare:self.name];//注意:基本数据类型要进行数据转换

29.    //如果年龄一样，就按照名字排序

30.    if (result == NSOrderedSame) {

31.        result = [[NSNumber numberWithInt:person.age] compare:[NSNumber numberWithInt:self.age]];

32.    }

33.    return result;

34. }

37. - (NSString *)description

38. {

39.    return [NSString stringWithFormat:@"%@    %d", name,age];

40. }

41. @end

1. #import <Foundation/Foundation.h>

2. #import "Person.h"

4. int main(int argc, const char * argv[]) {

5.    @autoreleasepool {

6.        Person *p1 = [[Person alloc]initWithNameAndAge:@" qweasadsasd" and:25];

7.        Person *p2 = [[Person alloc]initWithNameAndAge:@" 1234" and:28];

8.        Person *p3 = [[Person alloc]initWithNameAndAge:@"123" and:2];

9.        Person *p4 = [[Person alloc]initWithNameAndAge:@"zxc" and:89];

10.        Person *p5 = [[Person alloc]initWithNameAndAge:@"123" and:8];

11.        

12.        NSArray * persons = [NSArray arrayWithObjects:p1,p2,p3,p4,p5,nil];

13.        NSArray *sortedArray = [persons sortedArrayUsingSelector:@selector(comparePersonByName:)];

14.        NSLog(@"排序后:%@",sortedArray);

15.    }

16.    return 0;

17. }

方法四：高级排序