Foundation框架--数组中内容的排序种类 实例

//1.数组按照存入数据的顺序存储的。

        NSArray *array=@[@"b",@"d",@"1",@"a",@"z",@"2"];

        NSLog(@"排序前 array %@",array);

       array= [array sortedArrayUsingSelector:@selector(compare:)];

        NSLog(@"排序后 array %@",array);

        //2.使用block方式排序。

        NSArray *array1=@[@"z",@"4",@"3",@"x"];

        NSLog(@"array1 排序前%@",array1);

        array1 =[array1 sortedArrayUsingComparator:^NSComparisonResult(id obj1, id obj2) {

//            NSComparisonResult rersult=[obj1 compare:obj2];

//            return rersult;

            return [obj1 compare:obj2];

        }];

        NSLog(@"array1 排序后 %@",array1);

        //3.自定对象的排序，根据属性排序

        Person *p=[[Person alloc]initWithName:@"jack "andYear:@"1990" andAge:20];

        Person *p1=[[Person alloc]initWithName:@"tom" andYear:@"2000"andAge:21];

        Person *p2=[[Person alloc]initWithName:@"hoo "andYear:@"1908" andAge:18];

        Person *p3=[[Person alloc]initWithName:@"hoo1 "andYear:@"1907" andAge:18];

        NSArray *array2=@[p,p1,p2,p3];

        NSLog(@"排序前 array2 %@",array2);

        NSSortDescriptor *d1=[NSSortDescriptor sortDescriptorWithKey:@"age" ascending:YES];

        NSSortDescriptor *d2=[NSSortDescriptor sortDescriptorWithKey:@"year" ascending:YES];

        NSArray *descripts=@[d1,d2];

        array2 =[array2 sortedArrayUsingDescriptors:descripts];

        NSLog(@"排序后 array2%@",array2);

        //4.自定义对象的block方法排序

        NSArray *array4=@[p,p1,p2,p3];

        NSLog(@"array4 排序前%@",array4);

        array4=[array4 sortedArrayUsingComparator:^NSComparisonResult(id obj1, id obj2) {

            Person *p1=obj1;

            Person *p2=obj2;

            return [p1.year compare:p2.year];

        }];

        NSLog(@"array4 排序后 %@",array4);