基於textField將新密鑰寫入.plist文件

Question

我想要做的是從基於.plist的數組中填充pickerView，該.plist可以從textField中添加。我有它的工作，但它只添加一個鍵，並在添加新鍵時替換它。例如，如果我添加「hello」，然後嘗試添加另一個，它會用別的替換hello。

- (IBAction)setContext:(id)sender { 

NSString *documentsDirectory = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject]; 

NSString *path = [[NSBundle mainBundle] pathForResource:@"fullArray" ofType:@"plist"]; 
NSString *textFieldText = textField.text; 

NSMutableDictionary *rootDict = [[NSMutableDictionary alloc] initWithContentsOfFile:path]; 
[rootDict setValue:textField.text forKey:textField.text]; 

NSString *writablePath = [documentsDirectory stringByAppendingPathComponent:@"fullArray.plist"]; 
[rootDict writeToFile:writablePath atomically: YES]; 

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); //1 

NSString *plistPath = [documentsDirectory  stringByAppendingPathComponent:@"fullArray.plist"]; //3 

NSDictionary *dictionary = [[NSDictionary alloc] initWithContentsOfFile:plistPath]; 
NSArray *array = [dictionary allKeys]; 

arrayContext = [[NSMutableArray alloc] initWithArray:array]; 

[pickerView selectRow:0 inComponent:0 animated:YES]; 

[textField endEditing:YES]; 

[pickerView reloadAllComponents]; 

} 

我該如何解決這個問題？

Answer 1

好吧，你正在創建每次你撿東西的選擇器時新的NSMutableDictionary，正確的做法是：

1. 創建的NSMutableDictionary作爲屬性。
2. 每次你選擇時，都可以使用[NSString stringWithFormat：]爲該鍵創建一個新的字符串。
3. 使用[mutableDictionary setObject：forKey]在突變字典中使用新創建的密鑰設置新對象。