在Objective-C中添加UIAlertController下的文本视图

UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"标题" message:@"消息内容" preferredStyle:UIAlertControllerStyleAlert];

[alertController addTextFieldWithConfigurationHandler:^(UITextField * _Nonnull textField) {
    textField.placeholder = @"请输入文本";
}];

UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:nil];
UIAlertAction *okAction = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
    // 处理用户点击确定按钮后的逻辑
    UITextField *textField = alertController.textFields.firstObject;
    NSString *inputText = textField.text;
    NSLog(@"用户输入的文本：%@", inputText);
}];

[alertController addAction:cancelAction];
[alertController addAction:okAction];

UIViewController *currentViewController = [UIApplication sharedApplication].keyWindow.rootViewController;
[currentViewController presentViewController:alertController animated:YES completion:nil];