ios 判断用户是否开启通知

 if (@available(iOS 10.0, *)) {
        [[UNUserNotificationCenter currentNotificationCenter]getNotificationSettingsWithCompletionHandler:^(UNNotificationSettings * _Nonnull settings) {
            if (settings.authorizationStatus == UNAuthorizationStatusDenied) {
                // 用户未授权通知
                dispatch_async(dispatch_get_main_queue(), ^{

                });
            }else if (settings.authorizationStatus == UNAuthorizationStatusAuthorized) {
                dispatch_async(dispatch_get_main_queue(), ^{

                });
            }
        }];
        
        
    } else {
        if ([[UIApplication sharedApplication] currentUserNotificationSettings].types  == UIRemoteNotificationTypeNone) {
            dispatch_async(dispatch_get_main_queue(), ^{

            });
        }else {
            dispatch_async(dispatch_get_main_queue(), ^{

            });
        }
        
    }

如有错误欢迎指正