iOS:读写Plist

Question

我想将令牌从服务器保存到plist中。我不确定我是必须创建plist firs，还是可以在我的文档目录中使用以下代码自动创建它。但是，我不能创建plist并将我的字典写入其中。以下是我的代码

-(void)writeToPlist:(NSString*)value  forkey:(NSString *)key

{
    NSLog(@"Write plist here");

    //NSError *error;

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

    NSString *documentDirectory=[paths objectAtIndex:0];

    NSString* path=[documentDirectory stringByAppendingFormat:@"Util.plist"];

    NSLog(@"The path is %@",path);

    NSFileManager *fileManager=[NSFileManager defaultManager];

    NSMutableDictionary *data;

    if(![fileManager fileExistsAtPath:path])
    {
        path=[[NSBundle mainBundle]pathForResource:@"Util" ofType:@"plist"];
    }


    [data setObject:value forKey:key];

    [data writeToFile:path atomically:YES];//will it create the plist?


}   

Answer 1

为什么不使用NSUserDefaults保存它呢？

下面是一个示例代码：

NSUserDefaults *standardUserDefaults = [NSUserDefaults standardUserDefaults];
if([standardUserDefaults objectForKey:@"your-key-goes-here"] == nil) //this means you don't have that key
{[standardUserDefaults setValue:@"your-value-goes-here" forKey:@"your-key-goes-here"];}
[standardUserDefaults synchronize];  

别忘了在决赛中保持同步。

当您需要数据时，您需要调用standartUserDefaults的:valueForKey方法。

希望这能帮上忙..

Answer 2

我找到了一种通过编程轻松创建plist文件的方法，这对我很有效：

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *path = [documentsDirectory stringByAppendingString:@"/myFile.plist"];
if (![[NSFileManager defaultManager] fileExistsAtPath:path]){
   NSDictionary *emptyDic = [NSDictionary dictionary];
   [emptyDic writeToFile:path atomically:YES];
}

更改if语句中的内容，它就会起作用。