ios - 如何在 iOS9 中调用 NSObject 类中的 UIAlertviewController？

Question

由于 iOS9 中警报 View 的弃用，我很难通过 NSObject 类显示警报因为在 UIAlertView 中有一种显示警报的方法 [objaler show] ；但在 iOS 9 中显示警报我们必须使用 presentViewController 这样任何人都可以告诉我如何在 nsobject 类中显示警报 View Controller 。

我想在 NSObject 类中调用的代码如下:

   UIAlertController *alert= [UIAlertController
                               alertControllerWithTitle:@"Login"
                               message:@"Enter your credentials here"
                               preferredStyle:UIAlertControllerStyleAlert];

    UIAlertAction* ok = [UIAlertAction actionWithTitle:@"Done" style:UIAlertActionStyleDefault
                                               handler:^(UIAlertAction * action){
                                                   //Do Some action here
                                               }];
    UIAlertAction* cancel = [UIAlertAction actionWithTitle:@"Cancel" style:UIAlertActionStyleDefault
                                                   handler:^(UIAlertAction * action) {
                                                      NSLog(@"cancel btn");
                                                       [alert dismissViewControllerAnimated:YES completion:nil];

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

}

我的问题是我想在 NSObject 类中调用它。如何做到这一点？

Answer 1

试试这个:

你的 ObjectClassName.h 类

#import <UIKit/UIKit.h>
+ (void)showAlertTitle:(NSString *)title withMessage:(NSString *)message onView:(UIViewController *)viewController;

你的 ObjectClassName.m 类

+ (void)showAlertTitle:(NSString *)title withMessage:(NSString *)message onView:(UIViewController *)viewController
{
    UIAlertController * alert=   [UIAlertController
                                  alertControllerWithTitle:title
                                  message:message
                                  preferredStyle:UIAlertControllerStyleAlert];

    UIAlertAction* okButton = [UIAlertAction
                                actionWithTitle:@"OK"
                                style:UIAlertActionStyleDefault
                                handler:^(UIAlertAction * action)
                                {
                                    //Handel your yes please button action here
                                    [alert dismissViewControllerAnimated:YES completion:nil];

                                }];

    [alert addAction:okButton];

   [viewController presentViewController:alert animated:YES completion:nil];


}

当您调用导入您的对象类时:

#import "ObjectClassName.h";
[ObjectClassName showAlertTitle:@"Alert" withMessage:@"Alert Message" onView:self];