Question

我在我的应用中需要输入提示，我已尝试过这个

// Create a new item
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"New item" message:@"Enter a name for the item" delegate:nil cancelButtonTitle:@"Cancel" otherButtonTitles:@"Add", nil];
alert.alertViewStyle = UIAlertViewStylePlainTextInput;
[alert show];

然后像这样处理它：

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{
// The user created a new item, add it
if (buttonIndex == 1) {
    // Get the input text
    NSString *newItem = [[alertView textFieldAtIndex:0] text];
}
}

但它看起来不像clickedButtonAtIndex被调用，为什么？

亲切的问候，埃里克

Answer 1

您需要设置委托。

alert.delegate = self; //Or some other object other than self

或者，当您初始化警报时：

UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"New item" 
                                                message:@"Enter a name for the item"
                                               delegate:self
                                      cancelButtonTitle:@"Cancel"
                                      otherButtonTitles:@"Add", nil];

Answer 2

未调用方法，因为您未设置委托。
将自己作为代理人传递，以便获得对它的引用。

UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"New item" message:@"Enter a name for the item" delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:@"Add", nil];

UIAlertView输入提示

2 个答案: