UIAlertView 与 UITextField - 使用 NSUserDefaults 保存

发布于 2024-12-25 04:58:03 字数 906 浏览 5 评论 0原文

在我的 ViewDidLoad 的 .m 文件中，我有以下代码：

 if (![@"1" isEqualToString:[[NSUserDefaults standardUserDefaults] objectForKey:@"Name"]]) {
    [[NSUserDefaults standardUserDefaults] setValue:@"1" forKey:@"Name"];
    [[NSUserDefaults standardUserDefaults] synchronize];


UIAlertView *alertview = [[UIAlertView alloc] initWithTitle:@"What is your name?" message:@"\n\n\n" delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:@"Send", nil];

UITextField *utextfield = [[UITextField alloc] initWithFrame:CGRectMake (9.0, 60.0, 260.0, 25.0)]; utextfield.placeholder =@"Username";
[utextfield setBackgroundColor:[UIColor whiteColor]];
[alertview addSubview:utextfield];

[alertview show];

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{

}

如您所见，用户可以在此处保存他的姓名，这样他就不必一遍又一遍地输入它。除此之外，他不会再被询问是否输入了。但应用程序在加载时并没有显示名称，而是显示数字 1。我想我在这里遗漏了明显的内容。

原文

In the .m file of my ViewDidLoad I have the following code:

 if (![@"1" isEqualToString:[[NSUserDefaults standardUserDefaults] objectForKey:@"Name"]]) {
    [[NSUserDefaults standardUserDefaults] setValue:@"1" forKey:@"Name"];
    [[NSUserDefaults standardUserDefaults] synchronize];


UIAlertView *alertview = [[UIAlertView alloc] initWithTitle:@"What is your name?" message:@"\n\n\n" delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:@"Send", nil];

UITextField *utextfield = [[UITextField alloc] initWithFrame:CGRectMake (9.0, 60.0, 260.0, 25.0)]; utextfield.placeholder =@"Username";
[utextfield setBackgroundColor:[UIColor whiteColor]];
[alertview addSubview:utextfield];

[alertview show];

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{

}

As you can see the user can save his name here so he doesn't have to enter it over and over again. In addition to that he won't get asked again if he entered it. BUT instead of displaying the name when its loaded, the app displays the number 1. I guess I'm missing the obvious here.

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沫雨熙 2025-01-01 04:58:03

您永远不会设置 Name 值，应该在 alertView:clickedButtonAtIndex: 中完成

我还建议取消 @"1"，并检查 nil （如 @Roman 建议）或存储另一个默认键中的 BOOL。

...
utextfield.tag = 9876; // some value likely not in use by the internals



- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex {
  if (buttonIndex == alertView.cancelButtonIndex) {
    [[NSUserDefaults standardUserDefaults] removeObjectForKey:@"Name"];
  } else if (buttonIndex == alertView.firstOtherButtonIndex) {
    UITextField *utextfield = (UITextField *)[alertView viewWithTag:9876];
    [[NSUserDefaults standardUserDefaults] setValue:utextfield.text forKey:@"Name"];
  }
  [[NSUserDefaults standardUserDefaults] synchronize];
}

你可以根据你的逻辑进行调整

You are never setting the Name value, it should be done in alertView:clickedButtonAtIndex:

I would also suggest doing away with the @"1", and either checking for nil (as @Roman suggests) or storing a BOOL in another defaults key.

...
utextfield.tag = 9876; // some value likely not in use by the internals



- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex {
  if (buttonIndex == alertView.cancelButtonIndex) {
    [[NSUserDefaults standardUserDefaults] removeObjectForKey:@"Name"];
  } else if (buttonIndex == alertView.firstOtherButtonIndex) {
    UITextField *utextfield = (UITextField *)[alertView viewWithTag:9876];
    [[NSUserDefaults standardUserDefaults] setValue:utextfield.text forKey:@"Name"];
  }
  [[NSUserDefaults standardUserDefaults] synchronize];
}

you can adjust that as your logic suits you

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