我已经在这里工作了好几个小时，据说我应该按照应有的方式行事，但是当应用程序内的通知消失时，它并没有调用我的userNotificationCenter:(UNUserNotificationCenter *)center
willPresentNotification:(UNNotification *)notification
withCompletionHandler:(void (^)(UNNotificationPresentationOptions options))方法，根本没有任何事情发生。
应用程序会在不在应用程序时按预期发出通知，但在进入时不会发出任何通知。
这是我的代码，如果你能看到我做错的话，请告诉我。
Class NotificationDelegate.h：
#import <UIKit/UIKit.h>
#import <UserNotifications/UserNotifications.h>
@interface NotificationDelegate : UNUserNotificationCenter <UNUserNotificationCenterDelegate>
- (void)userNotificationCenter:(UNUserNotificationCenter *)center
willPresentNotification:(UNNotification *)notification
withCompletionHandler:(void (^)(UNNotificationPresentationOptions))completionHandler;
- (void)userNotificationCenter:(UNUserNotificationCenter *)center
didReceiveNotificationResponse:(UNNotificationResponse *)response
withCompletionHandler:(void (^)())completionHandler;
@end
NotificationDelegate.m：
#import "NotificationDelegate.h"
@implementation NotificationDelegate
//Called when a notification is delivered to a foreground app.
-(void)userNotificationCenter:(UNUserNotificationCenter *)center
willPresentNotification:(UNNotification *)notification
withCompletionHandler:(void (^)(UNNotificationPresentationOptions options))completionHandler{
NSLog(@"User Info : %@",notification.request.content.userInfo);
[self sendMessage:[UIApplication sharedApplication] message:notification.request.content];
completionHandler(UNAuthorizationOptionSound | UNAuthorizationOptionAlert | UNAuthorizationOptionBadge);
}
- (void) sendMessage:(UIApplication *)application message:(UNNotificationContent *)content{
UIAlertController *ac = [UIAlertController alertControllerWithTitle:content.title
message:content.body
preferredStyle:UIAlertControllerStyleAlert];
UIAlertAction *action = [UIAlertAction actionWithTitle:@"Go Away!" style:UIAlertActionStyleDefault handler:nil];
[ac addAction:action];
dispatch_async(dispatch_get_main_queue(), ^{
[application.keyWindow.rootViewController presentViewController:ac animated:YES completion:nil];
});
}
//Called to let your app know which action was selected by the user for a given notification.
-(void)userNotificationCenter:(UNUserNotificationCenter *)center
didReceiveNotificationResponse:(UNNotificationResponse *)response
withCompletionHandler:(void(^)())completionHandler{
NSLog(@"User Info : %@",response.notification.request.content.userInfo);
}
@end
AppDelegate.h：
#import <UIKit/UIKit.h>
#import "NotificationDelegate.h"
@import UserNotifications;
@interface AppDelegate : UIResponder <UIApplicationDelegate>
@property (strong, nonatomic) UNUserNotificationCenter *center;
@property (strong, nonatomic) NotificationDelegate *ncdel;
@property (strong, nonatomic) UIWindow *window;
@end
AppDelegate.m：
#import "AppDelegate.h"
@import UserNotifications;
@interface AppDelegate ()
@end
@implementation AppDelegate
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
self.center = [UNUserNotificationCenter currentNotificationCenter];
self.center.delegate = self.ncdel;
return YES;
}
ViewController.m：
#import "ViewController.h"
@interface ViewController ()
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
self.pvHelper = [[PickerViewHelperViewController alloc] init];
self.pickerView.dataSource = self.pvHelper;
self.pickerView.delegate = self.pvHelper;
self.pvHelper.answer = [NSNumber numberWithInteger:10];
}
- (void) requestPermission{
UNAuthorizationOptions options = UNAuthorizationOptionAlert + UNAuthorizationOptionSound + UNAuthorizationOptionBadge;
UNUserNotificationCenter *center = [UNUserNotificationCenter currentNotificationCenter];
[center requestAuthorizationWithOptions:options
completionHandler:^(BOOL granted, NSError * _Nullable error) {
if (!granted) {
NSLog(@"Something went wrong");
}
}];
}
- (void) createNotification:(NSNumber *)time{
UNMutableNotificationContent *content = [[UNMutableNotificationContent alloc] init];
content.title = [NSString localizedUserNotificationStringForKey:@"Alarming, isn't it?" arguments:nil];
content.body = [NSString localizedUserNotificationStringForKey:@"Listen to me my love" arguments:nil];
content.sound = [UNNotificationSound defaultSound];
content.badge = [NSNumber numberWithInteger:99];
UNTimeIntervalNotificationTrigger *trigger = [UNTimeIntervalNotificationTrigger triggerWithTimeInterval:[time integerValue]
repeats:NO];
//Note: Calling addNotificationRequest with the same identifier string will replace the existing notification. If you want to schedule multiple requests use a different identifier each time.
NSString *identifier = @"Alarm Triggered";
UNNotificationRequest *req = [UNNotificationRequest requestWithIdentifier:identifier content:content trigger:trigger];
UNUserNotificationCenter *center = [UNUserNotificationCenter currentNotificationCenter];
[center addNotificationRequest:req withCompletionHandler:^(NSError * _Nullable error) {
if(error != nil){
NSLog(@"Something went wrong: %@", error);
}
else{
NSLog(@"I have requested the Notification be made");
}
}];
}
- (IBAction)buttonTappedSetAlarm:(id)sender {
[self requestPermission];
[self createNotification: [[self pvHelper] answer]];
}
这对此并不重要，但我的单一视图应用程序只有10,20,30 ... 60秒，分钟，小时的选择器，我做数学计算以获得请求的时间。
就像我说的那样，请求在应用程序之外按预期工作，但是应用程序在前台，没有任何事情发生，而且它真的困扰我。
非常感谢任何帮助。
答案 0 :(得分：1)
我想出了怎么做。
我摆脱了尝试在另一个类中实现UNUserNotificationCenterDelegate并在我的视图控制器中完成它：
#import <UIKit/UIKit.h>
#import "PickerViewHelperViewController.h"
@import UserNotifications;
@interface ViewController : UIViewController <UNUserNotificationCenterDelegate>
@property (weak, nonatomic) IBOutlet UIPickerView *pickerView;
@property (strong, nonatomic) PickerViewHelperViewController *pvHelper;
// Two methods needed to implement from the UNUserNotificationCenterDelegate
- (void)userNotificationCenter:(UNUserNotificationCenter *)center
willPresentNotification:(UNNotification *)notification
withCompletionHandler:(void (^)(UNNotificationPresentationOptions))completionHandler;
- (void)userNotificationCenter:(UNUserNotificationCenter *)center
didReceiveNotificationResponse:(UNNotificationResponse *)response
withCompletionHandler:(void (^)())completionHandler;
@end
然后只需在我的.m文件中附带代码即可显示本地通知。
- (void) sendMessage:(UIApplication *)application title:(NSString *)title message:(NSString *)message{
UIAlertController *ac = [UIAlertController alertControllerWithTitle:title
message:message
preferredStyle:UIAlertControllerStyleAlert];
UIAlertAction *action = [UIAlertAction actionWithTitle:@"Go Away!" style:UIAlertActionStyleDefault handler:nil];
[ac addAction:action];
dispatch_async(dispatch_get_main_queue(), ^{
[application.keyWindow.rootViewController presentViewController:ac animated:YES completion:^{
application.applicationIconBadgeNumber = 0;
}];
});
}
//Called when a notification is delivered to a foreground app.
-(void)userNotificationCenter:(UNUserNotificationCenter *)center
willPresentNotification:(UNNotification *)notification
withCompletionHandler:(void (^)(UNNotificationPresentationOptions options))completionHandler{
NSLog(@"User Info : %@",notification.request.content.userInfo);
[self sendMessage:[UIApplication sharedApplication] title:@"local notification within App" message:notification.request.content.body];
completionHandler(UNAuthorizationOptionSound | UNAuthorizationOptionBadge);
}
//Called when a notification is delivered to a background app.
-(void)userNotificationCenter:(UNUserNotificationCenter *)center
didReceiveNotificationResponse:(UNNotificationResponse *)response
withCompletionHandler:(void(^)())completionHandler{
NSLog(@"User Info : %@",response.notification.request.content.userInfo);
[self sendMessage:[UIApplication sharedApplication]
title:@"I habe been opened from outside the App"
message:response.notification.request.content.body];
completionHandler(UNAuthorizationOptionSound | UNAuthorizationOptionAlert | UNAuthorizationOptionBadge);
}
我的创建通知和请求上述权限方法在代码中保持不变。
这允许在应用中显示本地通知，并在通过通知打开应用时显示通知。