判断用户是否打开了推送

#pragma mark - 是否开启APP推送
/**是否开启推送*/
+ (BOOL)isSwitchAppNotification {
    if (IOS_VERSION >= 10.0) {
        __block BOOL result = NO;
        //异步线程中操作是否完成
        __block BOOL inThreadOperationComplete = NO;
        [[UNUserNotificationCenter currentNotificationCenter] getNotificationSettingsWithCompletionHandler:^(UNNotificationSettings * _Nonnull settings) {
            if (settings.authorizationStatus == UNAuthorizationStatusDenied) {
                result = NO;
            }else if (settings.authorizationStatus == UNAuthorizationStatusNotDetermined) {
                result = NO;
            }else if (settings.authorizationStatus == UNAuthorizationStatusAuthorized) {
                result = YES;
            }else {
                result = NO;
            }
            inThreadOperationComplete = YES;
        }];
        
        while (!inThreadOperationComplete) {
            [NSThread sleepForTimeInterval:0];
        }
        return result;
    }
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wdeprecated-declarations"
    else if (IOS_VERSION >= 8.0)
    {
        UIUserNotificationSettings *setting = [[UIApplication sharedApplication] currentUserNotificationSettings];
        if (UIUserNotificationTypeNone != setting.types) {
            return YES;
        }else {
            return NO;
        }
        
    }else
    {
        UIRemoteNotificationType type = [[UIApplication sharedApplication] enabledRemoteNotificationTypes];
        if(UIRemoteNotificationTypeNone != type) {
            return YES;
        }else {
            return NO;
        }
    }
#pragma clang diagnostic pop
}

然后如果用户没有打开推送按钮
跳转到应用相关设置页面

    if (switch.on) {
        if (IOS_VERSION >= 10.0) {
            NSURL * url = [NSURL URLWithString:UIApplicationOpenSettingsURLString];
            [[UIApplication sharedApplication]openURL:url options:@{} completionHandler:^(BOOL success) {
                
            }];
        }else{
            //[[[NSBundle mainBundle] infoDictionary] objectForKey:@"CFBundleIdentifier"]] 应用标识
            NSURL * url = [NSURL URLWithString:[NSString stringWithFormat:@"prefs:root=%@",[[[NSBundle mainBundle] infoDictionary] objectForKey:@"CFBundleIdentifier"]]];
            [[UIApplication sharedApplication]openURL:url];
        }
    }

参考资料

iOS应用内跳转到指定系统设置页