ios-遍历和排序

//
//  main.m
//  OC-遍历和排序-homework
//
//  Created by dllo on 16/2/25.
//  Copyright © 2016年 dllo. All rights reserved.
//
 
#import <Foundation/Foundation.h>
#import "Person.h"
int main(int argc, const char * argv[]) {
    @autoreleasepool {
//        要求 :
//        1、创建1个包含5个字符串元素的数组; 2、 for循环倒序输出所有元素; 3、 for...in完成所有字符串元素的拼接( 成 个
//            新的字符串),并输出拼接好的字符串。
        NSArray *strArray = @[@"nanjing", @"shanghai", @"beijing", @"shangxi", @"chongqing"];
        for (int i = 0; i < strArray.count; i++) {
            NSLog(@"%@", [strArray objectAtIndex:strArray.count - 1 - i]);
        }
        NSMutableString *str = [NSMutableString stringWithCapacity:20];
        for (NSString *string in strArray) {
            [str appendString:string];
        }
        NSLog(@"%@", str);
 
//        要求:
//        1、创建1个包含5个person对象的数组(姓名 英 ); 2、 for循环找到年龄最 的Person对象; 3、 for...in遍历数组,把 于某个年龄的Person对象的姓名后  拼接上字符串“-brother”。
 
        Person *per1 = [[Person alloc]initWithName:@"ma" sex:@"male" age:26];
        Person *per2 = [[Person alloc]initWithName:@"liutaifeng" sex:@"male" age:22];
        Person *per3 = [[Person alloc]initWithName:@"zhengfeng " sex:@"male" age:23];
        Person *per4 = [[Person alloc]initWithName:@"ma" sex:@"male" age:27];
        Person *per5 = [[Person alloc]initWithName:@"ma" sex:@"male" age:29];
        NSArray *array = [NSArray arrayWithObjects:per1, per2, per3, per4, per5, nil];
        Person *per = [[Person alloc]initWithName:@"majian" sex:@"male" age:29];
        for (int i = 0; i < array.count; i++) {
            if ([[array objectAtIndex:i] age] < [per age]) {
                per = [array objectAtIndex:i];
            }
        }
        NSLog(@"%@", [per name]);
 
        NSArray *newArray = [array sortedArrayUsingSelector:@selector(compareWithName:)];
        NSLog(@"%@", newArray);
 
        NSArray *newArray2 = [array sortedArrayUsingSelector:@selector(compareWithSex:)];
        NSLog(@"%@", newArray2);
 
        NSArray *newArray3 = [array sortedArrayUsingSelector:@selector(compareWithAge:)];
        NSLog(@"%@", newArray3);
 
        NSSortDescriptor *sortOfName = [[NSSortDescriptor alloc]initWithKey:@"name" ascending:YES];
 
        NSSortDescriptor *sortOfAge = [[NSSortDescriptor alloc]initWithKey:@"age" ascending:YES];
 
        NSArray *array1 = [array sortedArrayUsingDescriptors:@[sortOfName, sortOfAge]];
        NSLog(@"%@", array1);
 
    }
    return 0;
}

Person.m文件:

//
//  Person.m
//  OC-遍历和排序-homework
//
//  Created by dllo on 16/2/25.
//  Copyright © 2016年 dllo. All rights reserved.
//
 
#import "Person.h"
 
@implementation Person
 
- (instancetype)initWithName:(NSString *)name sex:(NSString *)sex age:(NSInteger)age{
    self = [super init];
    if (self) {
        _name= name;
        _age = age;
        _sex = sex;
    }
    return self;
 
}
- (NSComparisonResult)compareWithName:(Person *)anOtherPerson{
 
    return [self.name compare:anOtherPerson.name];
 
}
 
- (NSComparisonResult)compareWithAge:(Person *)anOtherPerson{
    if (self.age > anOtherPerson.age) {
        return NSOrderedDescending;
    }else if(self.age < anOtherPerson.age){
        return NSOrderedAscending;
 
    }else{
        return NSOrderedSame;
    }
 
}
- (NSComparisonResult)compareWithSex:(Person *)anOtherPerson{
    return [self.sex compare:anOtherPerson.sex];
}
- (NSString *)description
{
    return [NSString stringWithFormat:@"name:%@, sex:%@, age:%ld", _name, _sex, _age];
}
@end