day04-04-NSArray2

Objective-c

//  main.m
//  day04-04-NSArray2
//
//  Created by Aaron on 15/7/6.
//  Copyright (c) 2015年 Aaron. All rights reserved.
//
#import <Foundation/Foundation.h>
/*
 NSArray *array = @[@1,@2,@3];
 [array count];
 [array objectAtIndex:0];
 id obj = array[0];
 [array indexOfObject:@1];
 [array containsObject:@1];
 [array firstObject];
 [array lastObject];
 [array indexOfObject:@1 inRange:NSMakeRange(0, 2)];
 [array subarrayWithRange:NSMakeRange(0, 2)];
 [array objectsAtIndexes:[NSIndexSet indexSetWithIndex:2]];
 */
//数组的遍历
#if 0
int main(int argc, const char * argv[]) {
    @autoreleasepool {
        NSArray *array = @[@"hello",@"world",@"hello",@"nihao"];
        //第一种方式:循环
#if 0
        for(int i = 0; i < array.count; i++)
        {
            id obj = array[i];
            NSLog(@"%@",obj);
        }
        for(NSInteger i = [array count]-1; i >= 0; i--)
        {
            id obj = array[i];
            NSLog(@"%@",obj);
        }
#endif
        //第二种方式: for in 结构
        //快速遍历
        //不能方便的使用i做下标
        //在使用for in结构的时候,不要改变数组的容量
        //只能完整的正序遍历一次
        //for(id obj in array)
        for(NSString *obj in array)
        {
//            if([obj isKindOfClass:[NSNumber class]])
//            {
                //NSLog(@"%@   %ld",obj,[array indexOfObject:obj]);
//            }
        }
        //第三种方式:枚举器
        NSEnumerator *enumerator = [array objectEnumerator];
        enumerator = [array reverseObjectEnumerator];
        id obj = nil;
        while(obj = [enumerator nextObject])
        {
            NSLog(@"%@",obj);
        }
    }
    return 0;
}
#endif
#if 0
int main()
{
    NSArray *array = @[@90,@88,@99,@50,@76,@52];
    NSMutableIndexSet *indexSet = [NSMutableIndexSet indexSet];
    for(int i = 0; i < [array count]; i++)
    {
        NSNumber *obj = [array objectAtIndex:i];
        if([obj integerValue] >= 60)
        {
            [indexSet addIndex:i];
        }
    }
    NSArray *sub = [array objectsAtIndexes:indexSet];
    NSLog(@"%@",sub);
}
#endif
//字符串和数组
#if 0
int main()
{
    NSString *path = @"/users/Aaron/desktop/file.txt";
    //以指定的字符串来切割字符串
    NSArray *array = [path componentsSeparatedByString:@"/d"];
    array  = [path componentsSeparatedByCharactersInSet:[NSCharacterSet characterSetWithCharactersInString:@"/"]];
    NSLog(@"%@",array);
    NSMutableString *str = [NSMutableString string];
    for(id obj in array)
    {
        if(![obj isEqualToString:@""])
        {
            [str appendFormat:@"/%@",obj];
            //NSLog(@"%@",obj);
        }
    }
    NSLog(@"%@",str);
    NSString *newStr = [array componentsJoinedByString:@"/"];
    NSLog(@"%@",newStr);
    //http://www.taobao.com/market/nvzhuang/qiang.php?spm=a21bo.7724922.8458.2.3nzdsq&acm=20140506001.1003.2.331846&uuid=AEDSuvcX_6UEJDkEXPAQCAXE5qpJkVjym&scm=1003.2.20140506001.OTHER_1436484331037_331846&pos=1
    NSArray *array1 = @[@"name=xiaobai",@"number=100",@"device=Iphone"];
    NSString *sss = [array1 componentsJoinedByString:@"&"];
    NSLog(@"%@",sss);
}
#endif
//可变数组
#if 0
int main()
{
    NSMutableArray *array = [NSMutableArray array];
    NSMutableArray *array1 = [NSMutableArray arrayWithArray:@[@1,@2]];
    //可变数组仅仅是在不可变的基础上添加了增删改
    //增
    //addObject: 往数组中增加一个元素,注意是增加到末尾
    [array1 addObject:@3];
    NSLog(@"%@",array1);
    //插入元素到指定的索引
    [array1 insertObject:@"..." atIndex:0];
    NSLog(@"%@",array1);
    //将其他数组的元素按顺序添加到当前数组
    [array addObjectsFromArray:array1];
    NSLog(@"-----%@",array);
//    NSMutableIndexSet *indexSet = [NSMutableIndexSet indexSet];
//    [indexSet addIndex:0];
//    [indexSet addIndex:2];
//    [indexSet addIndex:1];
//    [indexSet addIndex:3];
//    [array insertObjects:array1 atIndexes:indexSet];
//    NSLog(@"%@",array);
    //删除数组中的某一个对象
    //只要出现的对象都删掉
    [array addObject:@"..."];
    //[array removeObject:@"..."];
    NSLog(@"%@",array);
    //删掉指定的索引对应的对象
    [array removeObjectAtIndex:0];
    NSLog(@"%@",array);
    //删除所有对象
    //[array removeAllObjects];
    //替换元素
    [array replaceObjectAtIndex:3 withObject:@"+++++"];
    NSLog(@"%@",array);
    //快速修改数组
    [array setArray:@[@0,@9,@8]];
    NSLog(@"%@",array);
}
#endif
#if 0
int main()
{
    NSMutableArray *array = [NSMutableArray array];
    for(int i = 0; i < 5; i++)
    {
        int temp;
        scanf("%d",&temp);
        [array addObject:[NSNumber numberWithInt:temp]];
    }
    NSLog(@"%@",array);
}
#endif
#if 0
int main()
{
    //数组排序
    NSMutableArray *array = [NSMutableArray array];
    for(int i = 0 ; i < 20; i++)
    {
        NSString *str = [NSString stringWithFormat:@"string%d",i];
        [array addObject:str];
    }
    //第一种方式: 自己用循环来实现
    for(int i = 0; i < [array count]-1; i++)
    {
        for(int j = 0; j < [array count]-i-1; j++)
        {
            if([(NSString *)[array objectAtIndex:j] compare:[array objectAtIndex:j+1]] == NSOrderedAscending)
            {
                [array exchangeObjectAtIndex:j withObjectAtIndex:j+1];
            }
        }
    }
    NSLog(@"%@",array);
}
#endif
#import "Dog.h"
//#if 0
int main()
{
    NSMutableArray *array = [NSMutableArray array];
    for(int i = 0; i < 10; i++)
    {
        Dog *dog = [[Dog alloc] initWithAge:arc4random_uniform(20) andWeight:arc4random_uniform(50)];
        [array addObject:dog];
    }
    NSLog(@"%@",array);
//#endif
//#if 0
    for(int i = 0; i < [array count]-1; i++)
    {
        for(int j = 0; j < [array count]-i-1; j++)
        {
            if([(Dog *)[array objectAtIndex:j] compareByAgeWithOtherDog:[array objectAtIndex:j+1]] == NSOrderedAscending)
//            if([[array objectAtIndex:j] age] < [[array objectAtIndex:j+1] age])
            {
                [array exchangeObjectAtIndex:j withObjectAtIndex:j+1];
            }
        }
    }
//#endif
//#if 0
    [array sortUsingSelector:@selector(sortByAgeWithOtherDog:)];
    NSLog(@"%@",array);
}
//#endif

#import <Foundation/Foundation.h>
@interface Dog : NSObject
{
    NSInteger _age;
    NSInteger _weight;
}
-(instancetype)initWithAge:(NSInteger)age andWeight:(NSInteger)weight;
-(NSComparisonResult)compareByAgeWithOtherDog:(Dog *)dog;
-(BOOL)sortByAgeWithOtherDog:(Dog *)dog;
-(NSInteger)age;
//-(NSInteger)weight;
@end

#import "Dog.h"
@implementation Dog
-(instancetype)initWithAge:(NSInteger)age andWeight:(NSInteger)weight
{
    if(self = [super init])
    {
        _age = age;
        _weight = weight;
    }
    return self;
}
-(NSInteger)age
{
    return _age;
}
//-(NSInteger)weight{
//    return _weight;
//}
-(NSComparisonResult)compareByAgeWithOtherDog:(Dog *)dog
{
    if(_age > [dog age])
    {
        return NSOrderedDescending;
    }
    else if(_age == [dog age])
    {
        return NSOrderedSame;
    }
    else
    {
        return NSOrderedAscending;
    }
}
-(BOOL)sortByAgeWithOtherDog:(Dog *)dog
{
    return _age < [dog age];
}
-(NSString *)description
{
    return [NSString stringWithFormat:@"dog age: %5ld weight: %5ld",_age,_weight];
}
@end