将IOS数据保存到plist [英] Saving IOS data to plist

问题描述

我正在将这些数据写入plist文件，但是每次写入时，它都会替换以前的内容.也就是说，它会覆盖我重新加载页面时以前拥有的所有数据.我如何才能保留以前的数据，或者有人可以指出我的操作不正确?

I am writing these data to plist file, but every time I write, it replaces whatever was there before. I.e it is overwriting whatever data I had previously when I reload the page. How can I make the previous data persist or could someone point out what I am not doing correctly?

- (IBAction)buttonClickSave:(id)sender;
{
 pathList=[self getFilePath];

    if(![[NSFileManager defaultManager] fileExistsAtPath:pathList])
    {

        [[NSFileManager defaultManager] copyItemAtPath:[[NSBundle mainBundle] pathForResource:@"adresses" ofType:@"plist" ]toPath:pathList error:nil];
    }
    NSString *Name = @"Names";
    NSString *email = @"email";
    NSString *phone = @"phone";

    NSMutableArray *values = [[NSMutableArray alloc] initWithObjects:Name, email, phone, nil];
    NSMutableArray *keys = [[NSMutableArray alloc] initWithObjects:kTitleKey, kEmail, kPhone, nil];
    NSDictionary *dict = [[NSDictionary alloc] initWithObjects:values forKeys:keys];
    [self.arraysData addObject:dict];

    [self.arraysData writeToFile:pathList atomically:YES];
}

推荐答案

要初始化数组，请使用现有文件作为其源.这样可以确保您添加的所有条目都不会覆盖，而是对现有数据进行更改.

To initialize the array, use the existing file as its source. This will ensure that whatever entries you are adding is not overwriting but making changes to existing data.

因此，无论您在初始化arraysData的何处，都应使用以下代码:

So, wherever you are initializing the arraysData, use following code:

arraysData = [NSMutableArray arrayWithContentsOfFile: [self getFilePath]]; 

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