Iphone Plist-flie中的插入

我不熟悉iphone

我已经存储了dGameData.plist文件，在“根”字典下的“根”字典下，我有一个名为“gameProgress”的数组，我想在这个“gameProgress”数组中插入数据

下面是我的代码

-(void)writeDataToPhone
{
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

    NSString *documentsDirectory = [paths objectAtIndex:0];

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

    // read or create plist

    NSMutableDictionary *dict;

    NSFileManager *fileManager = [NSFileManager defaultManager];

    if ( [fileManager fileExistsAtPath:plistPath] ) {

        // Reading the Plist from inside the if

        //statement

        NSLog(@"dictionary existed, reading %@", plistPath);

        dict = [NSMutableDictionary dictionaryWithContentsOfFile:plistPath];

    }

   NSNumber *newNumberOfCompletedLevels = [NSNumber numberWithInt:1];

    [dict setObject:newNumberOfCompletedLevels forKey:@"gameProgress"];

    NSLog(@"writing to %@…", plistPath);

    [dict writeToFile:plistPath atomically:YES];


NSLog(@"dictionary values are…:");

for (id key in dict) {

    NSLog(@"key=%@, value=%@", key, [dict objectForKey:key]);

    }
}

但是我的数组是空的，没有插入任何内容

---

我的代码有什么问题？为了在数组中插入值，我应该在代码中做些什么更改呢？错误在

dict

对象中。您尚未初始化它

请使用这行代码：

NSMutableDictionary *dict = [NSMutableDictionary alloc] init];

而不是：

NSMutableDictionary *dict; 

---

这会解决你的问题。请告诉我您的反馈。

您需要初始化

dict

对象

NSMutableDictionary *dict = [NSMutableDictionary alloc] init];

工作非常好。 我只是喜欢

NSArray*Path=NSSearchPathForDirectoriesInDomains（NSDocumentDirectory，NSUserDomainMask，是）

---

有时这也是一个原因。感谢您的回复，但plist文件中没有插入任何内容。请检查此项以在dict中插入值。NSString*NewNumberOfCompletedLevel=[NSString stringWithFormat@“%d”，1]；[dict setObject:newNumberOfCompletedLevels-forKey:@“gameProgress”]；

NSString *documentsDirectory = [paths objectAtIndex:0];

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

// read or create plist

NSMutableDictionary *dict=[[NSMutableDictionary alloc]init];

NSFileManager *fileManager = [NSFileManager defaultManager];

if ( [fileManager fileExistsAtPath:plistPath] ) {

    // Reading the Plist from inside the if

    //statement

    NSLog(@"dictionary existed, reading %@", plistPath);

    dict = [NSMutableDictionary dictionary
}

NSNumber *newNumberOfCompletedLevels = [NSNumber numberWithInt:5];

[dict setObject:newNumberOfCompletedLevels forKey:@"gameProgress"];

NSLog(@"writing to %@…", plistPath);

[dict writeToFile:plistPath atomically:YES];


NSLog(@"dictionary values are…:");

for (id key in dict)
{

    NSLog(@"key=%@, value=%@", key, [dict objectForKey:key]);

}