ios - 如何将字典数组保存到plist？

Question

Plist只是不会保存自己......

我不明白我在这里做错了什么。请帮忙。

NSString *factorsFile = [[NSBundle mainBundle]pathForResource:@"factors" ofType:@"plist"];
NSMutableArray *factorsArray = [NSMutableArray arrayWithContentsOfFile:factorsFile];

NSMutableDictionary *dictFactor = [NSMutableDictionary dictionary];
[dictFactor setObject:self.nameField.text forKey:@"Factor"];
[dictFactor setObject:self.rankField.text forKey:@"Rank"];

NSLog(@"%@",dictFactor);

[factorsArray addObject:dictFactor];

NSLog(@"%@",factorsArray);

if([factorsArray writeToFile:factorsFile atomically:YES]){
    NSLog(@"lalal");
}

此代码能够进入最后一个 if 循环，但 plist 保持不变......为什么？