#import <Foundation/Foundation.h>

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

@autoreleasepool {

NSDictionary *dic1=@{@"name":@"小阳",

@"class":@"IOS8",

@"age":@"20"

};

NSDictionary *dic2=@{@"name":@"小红",

@"class":@"IOS8",

@"age":@"67"

};

NSDictionary *dic3=@{@"name":@"小丽",

@"class":@"IOS6",

@"age":@"12"

};

NSDictionary *dic4=@{@"name":@"小杨",

@"class":@"IOS8",

@"age":@"33"

};

NSDictionary *dic5=@{@"name":@"李俊威",

@"class":@"IOS6",

@"age":@"23"

};

NSDictionary *dic6=@{@"name":@"赵玉鑫",

@"class":@"IOS8",

@"age":@"9"

};

NSDictionary *dic7=@{@"name":@"胡旭阳",

@"class":@"IOS6",

@"age":@"20"

};

NSArray *arr=[[NSArray alloc]initWithObjects:dic1,dic2,dic3,dic4,dic5,dic6,dic7,nil];

//1.将以上四个字典存入数组中,输出数据以班级:XXX,姓名:XXX,年龄:XX格式。

NSLog(@"操作前数据????????????");

for (NSDictionary *dic in arr) {

NSLog(@"班级:%@,姓名:%@,年龄:%@",dic[@"class"],dic[@"name"],dic[@"age"]);

}

//2.删除小阳此条数据，列出剩余数据，输出格式同上。

NSMutableArray *muarr=[NSMutableArray array];

for (int i=0; i<arr.count; i++) {

NSDictionary *dic=arr[i];

if ( ![ [dic objectForKey:@"name"] isEqual:@"小阳"]) {

[muarr addObject:dic];

}

}

NSLog(@"删除后数据????????????");

for (NSDictionary *dic in muarr) {

NSLog(@"班级:%@,姓名:%@,年龄:%@",dic[@"class"],dic[@"name"],dic[@"age"]);

}

//3.按照班级进行排序，如果班级相同则按照年龄排序输出数据，格式同上。描述器

//NSSortDescriptor 指定用于对象数组排序的对象属性

NSSortDescriptor *classWithSort=[[NSSortDescriptor alloc]initWithKey:@"class" ascending:YES];

NSSortDescriptor *ageWithSort=[[NSSortDescriptor alloc]initWithKey:@"age" ascending:YES];

NSArray *elementarr=[NSArray arrayWithObjects:ageWithSort,classWithSort, nil];

NSArray *sortArray=[arr sortedArrayUsingDescriptors:elementarr];

NSLog(@"排序后数据????????????");

for (NSDictionary *dic in sortArray) {

NSLog(@"班级:%@,姓名:%@,年龄:%@",dic[@"class"],dic[@"name"],dic[@"age"]);

}

}

return 0;

}