为什么在iphone中保存NSArray总是失败

我想保存NSArray，但是失败了，为什么？为什么在iphone中保存NSArray总是失败

-(void)SaveDataAll:(NSMutableArray *)dataToSave:(NSString *)name 
    { 
      NSArray *array = [NSArray arrayWithArray:dataToSave]; 


      // save path 
      NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, 
                   NSUserDomainMask, YES); 

      if ([paths count] > 0) 
      { 
       // Array path 
       NSString *arrayPath = [[paths objectAtIndex:0] 
             stringByAppendingPathComponent:name]; 

       NSLog(@"SaveDataAll array====%@",array); 
       NSLog(@"SaveDataAll dataToSave====%@",dataToSave); 
       // save array 
       [array writeToFile:arrayPath atomically:YES]; 

       // getout 
       NSArray *arrayFromFile = [NSArray arrayWithContentsOfFile:arrayPath]; 

       NSLog(@"SaveDataAll ====%@",arrayFromFile); 
      } 
    }

这是印刷阵列。

2013-01-22 16:51:45.010 [49227:c07] SaveDataAll array====(
    "\U4ee5\U8272\U5217\U548c\U4f0a\U6717\Uff1a\U4e00\U500b\U611b\U60c5\U6545\U4e8b\Uff1f", 
    "\U53f2\U63d0\U82ac\Uff0e\U611b\U5ef8\U65af: \U4e00\U500b\U7236\U89aa\U8207\U5973\U5152\U7684\U9023\U7e6b\Uff0c\U4e00\U6b21\U4e00\U5f35\U7167\U7247", 
    "Molly Crockett \U8ac7\U5c0f\U5fc3\U300c\U795e\U7d93\U80e1\U8aaa\U300d", 
    "Maz Jobrani: \U7576\U4e00\U500b\U6c99\U70cf\U5730\U963f\U62c9\U4f2f\U4eba\U3001\U5370\U5ea6\U4eba\U3001\U548c\U4f0a\U6717\U4eba\U8d70\U9032\U5361\U9054\U7684\U9152\U5427....", 
    "Ellen 't Hoen: \U85e5\U7269\U5c08\U5229\U806f\U76df\Uff0c\U62ef\U6551\U751f\U547d", 
    "Nina Tandon\Uff1a \U7d44\U7e54\U5de5\U7a0b\U5b78\U662f\U91ab\U7642\U500b\U4eba\U5316\U7684\U9060\U666f?", 
    "\U5091\U592b\Uff0e\U53f2\U5bc6\U65af\Uff1a\U5f9e\U76e3\U7344\U5b78\U5230\U7684\U7d93\U5546\U4e4b\U9053", 
    "Bobby Ghosh: \U70ba\U4f55\U5168\U7403\U8056\U6230\U5df2\U7d93\U8f38\U4e86", 
    "\U4fdd\U7f85\U00b7\U5361\U8fea\U5c3c\Uff08Paolo Cardini\Uff09\Uff1a \U5225\U518d\U4e00\U5fc3\U591a\U7528\U4e86\Uff01\U8a66\U8a66\U5c08\U5fc3\U4e00\U81f4\U5427\Uff01", 
    "Munir Virani: \U6211\U5982\U4f55\U611b\U4e0a\U79bf\U9df9", 
    "\U73cd\U59ae\Uff0e\U96ea\U666e\Uff1a\U7834\U788e\U7684\U8eab\U9ad4\U4e0d\U4ee3\U8868\U7834\U788e\U7684\U4eba", 
    "Ernesto Sirolli: \U60f3\U8981\U5e6b\U52a9\U4eba\U55ce? \U9589\U4e0a\U5634\Uff0c\U7136\U5f8c\U807d\U5427!", 
    "14:57", 
    "03:38", 
    "11:18", 
    "07:11", 
    "11:16", 
    "06:19", 
    "05:00", 
    "16:31", 
    "02:52", 
    "06:41", 
    "18:57", 
    "17:09", 
    "14:57", 
    "03:38", 
    "11:18", 
    "07:11", 
    "11:16", 
    "06:19", 
    "05:00", 
    "16:31", 
    "02:52", 
    "06:41", 
    "18:57", 
    "17:09", 
    "<UIImage: 0x95075d0>", 
    "<UIImage: 0xa297da0>", 
    "<UIImage: 0xa29c480>", 
    "<UIImage: 0xa27bae0>", 
    "<UIImage: 0xa29b5c0>", 
    "<UIImage: 0x950c0d0>", 
    "<UIImage: 0xa29fcb0>", 
    "<UIImage: 0x950cee0>", 
    "<UIImage: 0xa2a0310>", 
    "<UIImage: 0x9509310>", 
    "<UIImage: 0x95509a0>", 
    "<UIImage: 0xa297fe0>", 
    "/talks/lang/zh-tw/israel_and_iran_a_love_story.html", 
    "/talks/lang/zh-tw/steven_addis_a_father_daughter_bond_one_photo_at_a_time.html", 
    "/talks/lang/zh-tw/molly_crockett_beware_neuro_bunk.html", 
    "/talks/lang/zh-tw/maz_jobrani_a_saudi_an_indian_and_an_iranian_walk_into_a_qatari_bar.html", 
    "/talks/lang/zh-tw/ellen_t_hoen_pool_medical_patents_save_lives.html", 
    "/talks/lang/zh-tw/nina_tandon_could_tissue_engineering_mean_personalized_medicine.html", 
    "/talks/lang/zh-tw/jeff_smith_lessons_in_business_from_prison.html", 
    "/talks/lang/zh-tw/bobby_ghosh_why_global_jihad_is_losing.html", 
    "/talks/lang/zh-tw/paolo_cardini_forget_multitasking_try_monotasking.html", 
    "/talks/lang/zh-tw/munir_virani_why_i_love_vultures.html", 
    "/talks/lang/zh-tw/janine_shepherd_a_broken_body_isn_t_a_broken_person.html", 
    "/talks/lang/zh-tw/ernesto_sirolli_want_to_help_someone_shut_up_and_listen.html" 
)

但NSLog(@"SaveDataAll ====%@",arrayFromFile); arrayFromFile always always is nil？

来源

2013-01-22 user1924507

尝试打印arrayPath并查看您是否获得有效位置。 – vshall

确实 - [NSArray writeToFile：atomically：]返回YES？ – RolandasR

请不要说出你的方法！这使得维护和使用变得更加困难。编辑：我输入vshall和GameBit打败我，所以请分享这些信息。 –

您在阵列有UIImage的 - 它们不能被保存

来源

2013-01-22 09:32:00 RolandasR

你的阵列有图像也。所以你不能直接保存到你的位置。所以你必须将NSArray转换为NSData格式。并将数据存储到您的位置。

NSData *data=[NSKeyedArchiver archivedDataWithRootObject:yourarrayName]; 
       [data writeToFile:yourfullpath atomically:YES];

明智的同时检索文件使用下面的代码。

NSData *NewData=[NSData dataWithContentsOfFile:yourfullpath]; 
NSArray *arrayNew=[NSKeyedUnarchiver unarchiveObjectWithData:NewData];

来源

2013-01-22 10:07:42 Senthilkumar

感谢RolandasR

因为在阵列UIImage - 他们不能保存

这是一个简单的方法，通过---- “archivedDataWithRootObject” 解决这个问题---- ---可以获得数组的根对象。

- （空）SaveDataAll：（NSMutableArray的*）dataToSave：（的NSString *）名称{

[self Save_str:dataToSave:name]; 
}

- （空）Save_str：（NSMutableArray的*）dataToSave1：（的NSString *）名称{

// -(void)SaveData:(NSInteger)rowChoice 
{ 



    //change from nsmutalblearray to nsarray 
    NSArray *array = [NSArray arrayWithArray:dataToSave1]; 

    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, 
                 NSUserDomainMask, YES); 

    if ([paths count] > 0) 
    { 
     // Array的保存路径 
     NSString *arrayPath = [[paths objectAtIndex:0] 
           stringByAppendingPathComponent:name]; 


     NSData *data=[NSKeyedArchiver archivedDataWithRootObject:array]; 


     bool saveok=[data writeToFile:arrayPath atomically:YES]; 

     if (saveok) { 
      NSLog(@"SaveDataAll saveok====true"); 

     } 
     else{ 
      NSLog(@"SaveDataAll saveok====false"); 
     } 

    } 

} 
}

来源

2013-02-26 13:25:46 user1924507

为什么在iphone中保存NSArray总是失败

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