ios - UIAlertView 文本字段键盘类型

Question

我在警报视图中显示文本字段键盘类型时遇到问题。我想显示数字键盘，但它不起作用。

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

switch (alertView.tag) {
    case 1:
        if (buttonIndex == 0) {
            UITextField *textField = [alertView textFieldAtIndex:0];
            textField.keyboardType = UIKeyboardTypeNumberPad;
            [self performSelectorOnMainThread:@selector(ProcessDeleteTransaction:) withObject:textField.text waitUntilDone:NO];
        }
        break;
    case 2:
        [self.navigationController popToRootViewControllerAnimated:YES];
        break;
    default:
        break;
}

}

Answer 1

尝试这个：

UIAlertView *a = [[UIAlertView alloc] initWithTitle:@"Howdie" message:@"msg" delegate:self cancelButtonTitle:@"OK" otherButtonTitles: nil];
a.alertViewStyle = UIAlertViewStylePlainTextInput;
UITextField *textField = [a textFieldAtIndex:0];
assert(textField);
textField.keyboardType = UIKeyboardTypeNumberPad;

[a show];

Answer 2

我不确定您为什么要为 UIAlertViewDelegate 方法发布代码。为什么在创建 UIAlertView 时不配置键盘类型？

实际上，我以前从未尝试过，但有时间试一试，这段代码运行良好：

UIAlertView *alert = [[UIAlertView alloc] initWithTitle:nil message:@"Test" delegate:self cancelButtonTitle:@"OK" otherButtonTitles: nil];
alert.alertViewStyle = UIAlertViewStylePlainTextInput;
UITextField *textField = [alert textFieldAtIndex:0];
textField.keyboardType = UIKeyboardTypeNumberPad;

[alert show];

Answer 3

如您所知，- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex当用户单击警报视图上的按钮时调用的委托方法，但textField.keyboardType应该在之前设置becomeFirstResponder..所以您应该设置一次keyboardType属性[[UIAlertView alloc] init]

Answer 4

尝试这个：

- (void)willPresentAlertView:(UIAlertView *)alertView {
    [[alertView textFieldAtIndex:0] setKeyboardType:UIKeyboardTypeDecimalPad];
    [[alertView textFieldAtIndex:0] becomeFirstResponder];
}