OC 之字典／数组混合使用（删除元素 描述器排序）

 NSArray *arr3=@[@{@"name":@"Tim Cook",@"age":@"24",@"sex":@"female",@"score":@"89"},@{@"name":@"Jony Ive",@"age":@"26",@"sex":@"female",@"score":@"76"},@{@"name":@"Steve Jobs",@"age":@"24",@"sex":@"male",@"score":@"67"},@{@"name":@"Robert Brunne",@"age":@"28",@"sex":@"male",@"score":@"88"}];
        
        /*
         1.添加数据姓名:Philip Schiller年龄:29性别:female分数:70到arr数组内。
         2.查找数组内"Steve Jobs"的数据并删除。
         3.按姓名首字母进行排序。
         4.按年龄进行升序排序,如果年龄相同则按性别进行排序。
         5.输出成绩大于或等于80分的学员信息。*/
        NSDictionary *dic=@{@"name":@"Philip Schiller",
                            @"age":@"29",
                            @"sex":@"female",
                            @"score":@"70"};
        NSArray *arr4=[arr3 arrayByAddingObject:dic];
        NSLog(@"姜易成");
        NSLog(@"第一题－－－－－－－－－－－－");
        for(NSDictionary *dic in arr4){
            NSLog(@"%@ %@ %@ %@",dic[@"name"],dic[@"age"],dic[@"sex"],dic[@"score"]);
        }
        NSMutableArray *arr5=[NSMutableArray arrayWithArray:arr4];
        NSMutableArray *arr6=[NSMutableArray arrayWithArray:arr4];
        NSLog(@"第二题－－－－－－－－－－－－");
        for(int i=0;i<arr4.count;i++){
            NSDictionary *dic=arr4[i];
            if([dic[@"name"] isEqual:@"Steve Jobs"]){
                [arr5 removeObject:dic];
            }
        }
        for(NSDictionary *dic in arr5){
            NSLog(@"%@ %@ %@ %@",dic[@"name"],dic[@"age"],dic[@"sex"],dic[@"score"]);
        }
        NSSortDescriptor *sorts=[NSSortDescriptor sortDescriptorWithKey:@"name" ascending:YES];
        [arr6 sortUsingDescriptors:[NSArray arrayWithObjects:sorts, nil]];
        NSLog(@"第三题－－－－－－－－－－－－");
        for(NSDictionary *dic in arr6){
            NSLog(@"%@ %@ %@ %@",dic[@"name"],dic[@"age"],dic[@"sex"],dic[@"score"]);
        }
        NSLog(@"第四题－－－－－－－－－－－－");
        NSSortDescriptor *sortAge=[NSSortDescriptor sortDescriptorWithKey:@"age" ascending:YES];
        NSSortDescriptor *sortSex=[NSSortDescriptor sortDescriptorWithKey:@"sex" ascending:YES];
        [arr6 sortUsingDescriptors:[NSArray arrayWithObjects:sortAge,sortSex, nil]];
        for(NSDictionary *dic in arr6){
            NSLog(@"%@ %@ %@ %@",dic[@"name"],dic[@"age"],dic[@"sex"],dic[@"score"]);
        }
        NSLog(@"第五题－－－－－－－－－－－－");
        for(NSDictionary *dic in arr6){
            int score =[dic[@"score"] intValue];
            if(score>80){
            NSLog(@"%@ %@ %@ %@",dic[@"name"],dic[@"age"],dic[@"sex"],dic[@"score"]);
            }
        }