数据持久化—真机上的Plist写入

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：

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

直接下面这种是不行的

1. NSMutableArray *array = [[NSMutableArray alloc] initWithContentsOfFile:plistPath];
2. [array insertObject:markName atIndex:0];
3. [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)

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

写入文件的位置:（ Document 文件夹)

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

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。