iOS 推送收不到问题

一、常常token会变的话，估计是你注销了 [[UIApplication sharedApplication] unregisterForRemoteNotifications];

二、通常收不到是证书问题，若是以前能收到，后面收不到，那最多是证书问题。

三、本地注册通知方法的改变，主要是ios8之后

#pragma mark - 用户通知(推送) _自定义方法

/** 注册远程通知 */
- (void)registerRemoteNotification {
    
#ifdef __IPHONE_8_0
    if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 8.0) {
        //IOS8 新的通知机制category注册
        UIMutableUserNotificationAction *action1;
        action1 = [[UIMutableUserNotificationAction alloc] init];
        [action1 setActivationMode:UIUserNotificationActivationModeBackground];
        [action1 setTitle:@"取消"];
        [action1 setIdentifier:NotificationActionOneIdent];
        [action1 setDestructive:NO];
        [action1 setAuthenticationRequired:NO];
        
        UIMutableUserNotificationAction *action2;
        action2 = [[UIMutableUserNotificationAction alloc] init];
        [action2 setActivationMode:UIUserNotificationActivationModeBackground];
        [action2 setTitle:@"回复"];
        [action2 setIdentifier:NotificationActionTwoIdent];
        [action2 setDestructive:NO];
        [action2 setAuthenticationRequired:NO];
        
        UIMutableUserNotificationCategory *actionCategory;
        actionCategory = [[UIMutableUserNotificationCategory alloc] init];
        [actionCategory setIdentifier:NotificationCategoryIdent];
        [actionCategory setActions:@[ action1, action2 ]
                        forContext:UIUserNotificationActionContextDefault];
        
        NSSet *categories = [NSSet setWithObject:actionCategory];
        UIUserNotificationType types = (UIUserNotificationTypeAlert |
                                        UIUserNotificationTypeSound |
                                        UIUserNotificationTypeBadge);
        
        UIUserNotificationSettings *settings;
        settings = [UIUserNotificationSettings settingsForTypes:types categories:categories];
        [[UIApplication sharedApplication] registerForRemoteNotifications];
        [[UIApplication sharedApplication] registerUserNotificationSettings:settings];
        
    } else {
        UIRemoteNotificationType apn_type = (UIRemoteNotificationType)(UIRemoteNotificationTypeAlert |
                                                                       UIRemoteNotificationTypeSound |
                                                                       UIRemoteNotificationTypeBadge);
        [[UIApplication sharedApplication] registerForRemoteNotificationTypes:apn_type];
    }
#else
    UIRemoteNotificationType apn_type = (UIRemoteNotificationType)(UIRemoteNotificationTypeAlert |
                                                                   UIRemoteNotificationTypeSound |
                                                                   UIRemoteNotificationTypeBadge);
    [[UIApplication sharedApplication] registerForRemoteNotificationTypes:apn_type];
#endif
}