ios – 如何用plist写入数据？

- (IBAction)save:(id)sender
{
    NSString *path = [[NSBundle mainBundle] pathForResource:@"drinks" ofType:@"plist"];
    NSString *drinkName = self.name.text;
    NSString *drinkIngredients = self.ingredients.text;
    NSString *drinkDirection = self.directions.text;
    NSArray *values = [[NSArray alloc] initWithObjects:drinkDirection,drinkIngredients,drinkName,nil];
    NSArray *keys = [[NSArray alloc] initWithObjects:DIRECTIONS_KEY,INGREDIENTS_KEY,NAME_KEY,nil];
    NSDictionary *dict = [[NSDictionary alloc] initWithObjects:values forKeys:keys];
    [self.drinkArray addObject:dict];
    NSLog(@"%@",self.drinkArray);
    [self.drinkArray writeToFile:path atomically:YES];
}

您正在尝试将文件写入应用程序包,这是不可能的.而是将文件保存到Documents文件夹.

NSString *path = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES) lastObject];
path = [path stringByAppendingPathComponent:@"drinks.plist"];

pathForResource方法只能用于读取您在Xcode中添加到项目中的资源.

以下是您在应用中修改plist时通常执行的操作：
1.首次启动时,将drinks.plist从应用程序包复制到应用程序的Documents文件夹(使用NSFileManager).
2.读/写时仅使用Documents文件夹中的文件.

UPDATE

这是初始化drinkArray属性的方法：

NSString *destPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,YES) lastObject];
destPath = [destPath stringByAppendingPathComponent:@"drinks.plist"];

// If the file doesn't exist in the Documents Folder,copy it.
NSFileManager *fileManager = [NSFileManager defaultManager];

if (![fileManager fileExistsAtPath:destPath]) {
    NSString *sourcePath = [[NSBundle mainBundle] pathForResource:@"drinks" ofType:@"plist"];
    [fileManager copyItemAtPath:sourcePath toPath:destPath error:nil];
}

// Load the Property List.
drinkArray = [[NSArray alloc] initWithContentsOfFile:destPath];