IOS以编程方式创建UIAlertViewController [英] IOS create UIAlertViewController programmatically

问题描述

我正在使用带代码的ViewController（没有故事板）。我正在尝试添加和AlertController

I'm working on a ViewController with code (no storyboard). I'm trying to add and AlertController

我已在.m中声明属性

@property (nonatomic, strong) UIAlertController *alertController;

和中的init> loadview 方法

//alertviewController
    _alertController = [[UIAlertController alloc]initWithNibName:nil bundle:nil];

并在 viewDidLoad 中调用alertview：

And call the alertview in viewDidLoad:

_alertController = [UIAlertController alertControllerWithTitle:@"Error display content" message:@"Error connecting to server, no local database" preferredStyle:UIAlertControllerStyleAlert];

UIAlertAction *ok = [UIAlertAction actionWithTitle:@"OK" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
                LandingPageViewController *viewController = [[LandingPageViewController alloc] initWithNibName:nil bundle:nil];
    //            viewController.showNavBarBackButton = YES;
                [[AppDelegate sharedAppDelegate].rootViewController cPushViewController:viewController];
}];
[_alertController addAction:ok];
[self presentViewController:_alertController animated:YES completion:nil];

我不知道为什么警报没有出现。我的代码出了点问题。如何以编程方式设置和调用 alertViewController ？

I dont' know why the alert is not showing up. Some thing wrong with my code. How to set up and call alertViewController programmatically?

推荐答案

- (void)logoutButtonPressed
{
     UIAlertController * alert = [UIAlertController
                                 alertControllerWithTitle:@"Logout"
                                 message:@"Are You Sure Want to Logout!"
                                 preferredStyle:UIAlertControllerStyleAlert];

    //Add Buttons

    UIAlertAction* yesButton = [UIAlertAction
                                actionWithTitle:@"Yes"
                                style:UIAlertActionStyleDefault
                                handler:^(UIAlertAction * action) {
                                    //Handle your yes please button action here
                                    [self clearAllData];
                                }];

    UIAlertAction* noButton = [UIAlertAction
                               actionWithTitle:@"Cancel"
                               style:UIAlertActionStyleDefault
                               handler:^(UIAlertAction * action) {
                                   //Handle no, thanks button
                               }];

    //Add your buttons to alert controller

    [alert addAction:yesButton];
    [alert addAction:noButton];

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

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