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数据持久化—真机上的Plist写入

2024-08-08 13:01:18   218人阅读

其实写入不到真机里面主要是你写入时，当前那文件夹里你要写入的plist根本不存在

所以你怎么写都写不进去，所以你必须先创建你要写入的plist;

你用这样初始化程序就能自己创建：

[cpp] view plaincopy
  1. NSMutableArray *dictplist = [[NSMutableArray alloc] init];  
  2.                        [dictplist insertObject:markName atIndex:0];  
  3.                          
  4.                        [dictplist writeToFile:plistPath atomically:YES];  

直接下面这种是不行的

[cpp] view plaincopy
  1. NSMutableArray *array = [[NSMutableArray alloc] initWithContentsOfFile:plistPath];  
  2.                        [array insertObject:markName atIndex:0];  
  3.                          
  4.                        [array writeToFile:plistPath atomically:YES];  

下面是具体的实现方法

一般plist 的写入位置在

写入文件的位置:(Library文件夹)

[cpp] view plaincopy
  1. NSString *lib = [NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES) lastObject];  
  2.                     NSString *libPath = [lib stringByAppendingString:@"/Caches"];  
  3.                     NSString* plistPath = [libPath stringByAppendingFormat:@"/bookmark.plist"];  
  4.                       
  5.                     NSLog(@"%@",plistPath);  
  6.                     if(![[NSFileManager defaultManager] fileExistsAtPath:plistPath]) {  
  7.                         NSMutableArray *dictplist = [[NSMutableArray alloc] init];  
  8.                         [dictplist insertObject:markName atIndex:0];  
  9.                           
  10.                         [dictplist writeToFile:plistPath atomically:YES];  
  11.                         NSLog(@"------1-----%@",dictplist);  
  12.                     }  
  13.                     else  
  14.                     {  
  15.                         NSMutableArray *array = [[NSMutableArray alloc] initWithContentsOfFile:plistPath];  
  16.                         [array insertObject:markName atIndex:0];  
  17.                           
  18.                         [array writeToFile:plistPath atomically:YES];  
  19.                         NSLog(@"-------2----%@",array);  
  20.                     }  


写入文件的位置:（ Document 文件夹)

[cpp] view plaincopy
  1. NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);  
  2.                      
  3.                    //获取完整路径  
  4.                      
  5.                    NSString *documentsDirectory = [paths objectAtIndex:0];  
  6.                      
  7.                    NSString *plistPath = [documentsDirectory stringByAppendingPathComponent:@"test2.plist"];  
  8.              
  9.                    NSLog(@"%@",plistPath);  
  10.   
  11.                    if(![[NSFileManager defaultManager] fileExistsAtPath:plistPath]) {  
  12.                        NSMutableArray *dictplist = [[NSMutableArray alloc] init];  
  13.                        [dictplist insertObject:markName atIndex:0];  
  14.   
  15.                        [dictplist writeToFile:plistPath atomically:YES];  
  16.                        NSLog(@"------1-----%@",dictplist);  
  17.                    }  
  18.                    else  
  19.                    {  
  20.                        NSMutableArray *array = [[NSMutableArray alloc] initWithContentsOfFile:plistPath];  
  21.                        [array insertObject:markName atIndex:0];  
  22.   
  23.                        [array writeToFile:plistPath atomically:YES];  
  24.                        NSLog(@"-------2----%@",array);  
  25.                     }  

 

下面的是参考 http://blog.csdn.net/smallsky_keke/article/details/7431277

这篇文章是自己通过实践获取，在网上查过很多资料，也走了不上的弯路，由于刚开始学子不久，只是把自己遇到的问题贡献给大家

一，创建文件   

    

    //获取路径对象

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

   //获取完整路径

    NSString *documentsDirectory = [paths objectAtIndex:0];

    NSString *plistPath = [documentsDirectory stringByAppendingPathComponent:@"test.plist"];

   NSMutableDictionary *dictplist = [[NSMutableDictionaryalloc ] init];

   //设置属性值

    [dictplist setObject:@"张三" forKey:@"name"];

    [dictplist setObject:@"李四"forKey:@"name1"];

    [dictplist setObject:@"王五"forKey:@"name2"];

   //写入文件

    [dictplist writeToFile:plistPath atomically:YES];

这个是创建了一个简单的plist文件，创建后的图1为：


下面是创建了一种多键值的plist文件，代码和图如下：

 

//获取路径对象

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

   //获取完整路径

    NSString *documentsDirectory = [paths objectAtIndex:0];

    NSString *plistPath = [documentsDirectory stringByAppendingPathComponent:@"test.plist"];

   NSMutableDictionary *dictplist = [[NSMutableDictionaryalloc ] init];

   //定义第一个插件的属性

   NSMutableDictionary *plugin1 = [[NSMutableDictionaryalloc]init];

    [plugin1 setObject:@"张三"forKey:@"name1"];

    [plugin1 setObject:@"李四"forKey:@"name2"];

   //定义第二个插件的属性

   NSMutableDictionary *plugin2 = [[NSMutableDictionaryalloc]init];

    [plugin2 setObject:@"王五"forKey:@"name1"];

    [plugin2 setObject:@"赵斌"forKey:@"name2"];

   //设置属性值

    [dictplist setObject:plugin1 forKey:@"初一班"];

    [dictplist setObject:plugin2 forKey:@"初二班"];

   //写入文件

    [dictplist writeToFile:plistPath atomically:YES];

      

图2：

    

针对图1进行修改的程序，代码如下：

    NSString *path = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES)       objectAtIndex:0]stringByAppendingPathComponent:@"test.plist"];    

   NSMutableDictionary *applist = [[[NSMutableDictionaryalloc]initWithContentsOfFile:path]mutableCopy];    

    NSString *name = [applist objectForKey:@"name"];    

    name = @"山山";   

    [applist setObject:name forKey:@"name"];

    [applist writeToFile:path atomically:YES];

执行后如下图：

    


针对图2进行修改的程序，代码如下：

   

   

      [dictplist writeToFile:plistPath atomically:YES];

   NSString *path = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES)objectAtIndex:0]stringByAppendingPathComponent:@"test.plist"];

    

   //根据路径获取test.plist的全部内容

    NSMutableDictionary *infolist= [[[NSMutableDictionaryalloc]initWithContentsOfFile:path]mutableCopy];

    

    

    //获取初一班的信息

    NSMutableDictionary *info = [infolist objectForKey:@"初一班"];

    

    NSString *name1 = [info objectForKey:@"name1"];

    

    name1 = @"山山";

    

    [info setValue:name1 forKey:@"name1"];

    [infolist setValue:info forKey:@"初一班"];

    [infolist writeToFile:path atomically:YES];


图如下：

    

以上两个修改信息的地方，必须要加入红色标记的方法，才能在表里进行增改操作。

以上是个人的学习心得，请大家多多指教。

   

数据持久化—真机上的Plist写入


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