数组排序

#import <Foundation/Foundation.h>

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

@autoreleasepool {

NSArray *arr=@[@{@"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。

*/

NSMutableArray *newarr= [[NSMutableArray alloc]initWithArray:arr];

NSDictionary *arr1=@{@"name":@"Philip Schiller",@"age":@"29",@"sex":@"female",@"score":@"70"};

[newarr addObject:arr1];

/* 2.查找数组内"Steve Jobs"的数据并删除。*/

for (int i=0; i<[newarr count]; i++) {

NSDictionary *dic=newarr[i];

if ([dic[@"name"]isEqual:@"Steve Jobs"]) {

[newarr removeObject: dic];

}

}

/*3.按姓名首字母进行排序。*/

NSSortDescriptor *des=[NSSortDescriptor sortDescriptorWithKey:@"name" ascending:1];

NSArray *arr2 =[newarr sortedArrayUsingDescriptors:[NSArray arrayWithObjects:des, nil]];

for (NSDictionary *dic in arr2) {

NSLog(@"%@ %@ %@ %@",dic[@"name"],dic[@"age"],dic[@"sex"],dic[@"score"]);

}

/*4.按年龄进行升序排序,如果年龄相同则按性别进行排序。*/

NSSortDescriptor *des1=[NSSortDescriptor sortDescriptorWithKey:@"age" ascending:1];

NSSortDescriptor *des4=[NSSortDescriptor sortDescriptorWithKey:@"sex" ascending:1];

NSArray *arr3 =[newarr sortedArrayUsingDescriptors:[NSArray arrayWithObjects:des1,des4, nil]];

for (NSDictionary *dic1 in arr3) {

NSLog(@"%@ %@ %@ %@",dic1[@"name"],dic1[@"age"],dic1[@"sex"],dic1[@"score"]);

}

/*5.输出成绩大于或等于80分的学员信息。*/

for (NSDictionary *dic3 in arr2) {

int num=[dic3[@"score"] intValue];

if (num>=80) {

NSLog(@"%@ %@ %@ %@",dic3[@"name"],dic3[@"age"],dic3[@"sex"],dic3[@"score"]);

}

}

}

return 0;

}