我使用下面的方法从我的plist获取一个数组,然后将某个值增加1,然后保存它。但是我记录了数组,每次实际上值并没有增加。
在我的plist中,我有一个数组,并且在这个数字值中,每个都被设置为0.因此,每次我再次运行它,它似乎回到0。
NSString *path = [[NSBundle mainBundle] bundlePath];
NSString *finalPath = [path stringByAppendingPathComponent:@"Words.plist"];
NSMutableDictionary *dict = [NSMutableDictionary dictionaryWithContentsOfFile:finalPath];
NSMutableArray *errors = [dict objectForKey:[NSString stringWithFormat:@"Errors%d.%d", [[stageSelectionTable indexPathForSelectedRow] section] +1, [[stageSelectionTable indexPathForSelectedRow] row] +1]];
int a = [[errors objectAtIndex:wordIndexPath] intValue];
a += 1;
NSNumber *b = [NSNumber numberWithInt:a];
[errors replaceObjectAtIndex:wordIndexPath withObject:b];
[errors writeToFile:finalPath atomically:YES];
您只能写入documents-folder中的文件。你不能写你的包!
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *filePath = [documentsDirectory stringByAppendingPathComponent:@"Namelist.plist"];
您可以使用NSFilemanager
将Plist-File复制到documents-folder。
要获取文件的路径:
- (NSString *)filePath {
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *filePath = [documentsDirectory stringByAppendingPathComponent:@"MyFile.plist"];
return filePath;
}
要复制该文件(如果该文件不存在):
NSFileManager *fileManager = [NSFileManager defaultManager];
if (![fileManager fileExistsAtPath:[self filePath]]) {
NSString *path = [[NSBundle mainBundle] pathForResource:@"MyFile" ofType:@"plist"];
[fileManager copyItemAtPath:path toPath:[self filePath] error:nil];
}
现在您可以将NSDictionary
写入Documents-Directory:
[dict writeToFile:[self filePath] atomically:YES];
但是你真的需要更新dict中的数组!
您正在将数组写入磁盘,而不是数组源自的字典:
[dict writeToFile:finalPath atomically:YES];
此外,在保存之前,您需要将Errors%d.%d
对象替换为更新的对象:
[dict setObject:errors forKey:/* your formatted key*/];
最后,正如@ mavrick3指出的那样,您无法将文件保存到捆绑包中,只能保存到应用程序的文档目录中。