Question

这是我的AlertView代码：

- (void)initializeAlertControllerForOneButtonWithTitle:(NSString *)title withMessage:(NSString *)msg withYesButtonTitle:(NSString *)yesButtonTitle withYesButtonAction:(id)yesButtonAction
{
    UIAlertController * alert = [UIAlertController
                                 alertControllerWithTitle:title
                                 message:msg
                                 preferredStyle:UIAlertControllerStyleAlert];

    UIAlertAction* yesBtn = [UIAlertAction
                             actionWithTitle:yesButtonTitle
                             style:UIAlertActionStyleDefault
                             handler:^(UIAlertAction * action) {
                                 if (self.activityIndicator.animating) {
                                     [self.activityIndicator stopAnimating];
                                 }

                                 if ([title isEqualToString:@"Wrong Password!"]) {
                                     self.editTextField.text = @"";
                                     [self.editTextField becomeFirstResponder];
                                 }
                             }];

    [alert addAction:yesBtn];

    [self presentViewController:alert animated:YES completion:nil];
}

我正在尝试使用NSNotificatoin Response方法触发此警报。我的Notification Response代码：

- (void)receiveSMSVerificationResponse:(NSNotification *)notification
{
    SMSVerificationDigitClassModel *smsVerificationDigitClassModel = [[SMSVerificationDigitClassModel alloc] init];
    smsVerificationDigitClassModel = [notification object];

    if (smsVerificationDigitClassModel.viewControllerName == ViewControllerNameProfileInfoEditViewController) {

        if ([self alreadyRegisteredPhoneNumber:smsVerificationDigitClassModel.phoneNumber] == YES) {
            NSLog(@"jogajog");
            [self initializeAlertControllerForOneButtonWithTitle:@"Already Registered!" withMessage:kAlreadyRegisteredPhoneNumberMSGForChangePhoneNumber withYesButtonTitle:@"Ok" withYesButtonAction:nil];

        } else {
            if ([AdditionalClasses internetConnectionCheck] == YES) {
                self.userModelClass.phone_number = smsVerificationDigitClassModel.phoneNumber;
                [self updateUserModel:self.userModelClass];
            } else {
                [self noInternetConnectionAlert];
            }
        }
        //Check if that phone number is already used
        // udate phone numner in server
        // update phone number in core data
        //[self goToSignUpViewControllerWithPhoneNumber:smsVerificationDigitClassModel.phoneNumber];
    }
}

我从断点检查它，此行[self initializeAlertControllerForOneButtonWithTitle:@"Already Registered!" withMessage:kAlreadyRegisteredPhoneNumberMSGForChangePhoneNumber withYesButtonTitle:@"Ok" withYesButtonAction:nil];实际上正在调用，但警报视图没有弹出。它说：

“警告：尝试显示其视图不在窗口层次结构中！”

我尝试添加通知观察方法：

- (void)addNotificationObserver
{
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotification object:nil];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(receiveUserModelResponse:) name:@"sendUpdateRequestToServerForPhoneNumberWithUserModel" object:nil];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(receiveSMSVerificationResponse:) name:@"SMSVerificationForPhoneNumber" object:nil];
}

在viewDidLoad，viewDidAppear＆amp; viewWillAppear中的removeObserver和dealloc中的- (void)dealloc { [[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillShowNotification object:nil]; [[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardWillHideNotification object:nil]; [[NSNotificationCenter defaultCenter] removeObserver:self name:@"sendUpdateRequestToServerForPhoneNumberWithUserModel" object:nil]; [[NSNotificationCenter defaultCenter] removeObserver:self name:@"SMSVerificationForPhoneNumber" object:nil]; }，

window hierarchy!

但根本没有显示。那么，如何更改此viewController中的TEMPLATE_DIRS = (os.path.join(os.path.dirname(__file__),'templates').replace('\\','/'),)。如果您理解，请回复。非常感谢。

Answer 1

在主队列调度队列块中调用initializeAlertControllerForOneButtonWithTitle方法。

所有用户界面操作都应该是主要威胁。

#include <string>
#include <list>
#include <memory>
#include <iostream>

class A
 { };

class B
 { };

template <typename>
struct specIndex
 { static constexpr std::size_t value { 0U }; }; // generic version

template <typename T>
struct specIndex<std::list<T> &>
 { static constexpr std::size_t value { 1U }; }; // pro lists

template <typename T>
struct specIndex<std::list<T> const &>
 { static constexpr std::size_t value { 1U }; }; // pro lists

template <typename T, std::size_t = specIndex<T>::value>
class C
 { };

template<typename T>
class C<T, 1U> : public A, public B
 {
   private:
      T & l_ref;

   public:
      C (T & lr) : l_ref{lr}
       { std::cout << "- list version" << std::endl; }
 };

int main ()
 {
   std::list<long>  sll;

   C<int>                     a;
   C<std::list<long> &>       b{sll};
   C<std::list<long> const &> c{sll};
 }

NSNotification响应中未触发“UIAlertController”

1 个答案: