如何检查 iPhone 上的通知是否已启用

Question

如何检查 iPhone 上的通知是否已启用？ 我安装应用程序，应用程序说确认启用应用程序的推送通知，我单击“确定”。但如果 iPhone 上禁用了通知，则此操作不会启用通知。 如何检查？

Answer 1

这应该有效：

UIRemoteNotificationType types = [[UIApplication sharedApplication] enabledRemoteNotificationTypes];
if (types == UIRemoteNotificationTypeNone) 
   // Disabled

Answer 2

这在 iOS8 中发生了变化。要同时支持 iOS8 及更低版本，请执行以下操作

+ (BOOL)notificationServicesEnabled {
    BOOL isEnabled = NO;

    if ([[UIApplication sharedApplication] respondsToSelector:@selector(currentUserNotificationSettings)]){
        UIUserNotificationSettings *notificationSettings = [[UIApplication sharedApplication] currentUserNotificationSettings];

        if (!notificationSettings || (notificationSettings.types == UIUserNotificationTypeNone)) {
            isEnabled = NO;
        } else {
            isEnabled = YES;
        }
    } else {
        UIRemoteNotificationType types = [[UIApplication sharedApplication] enabledRemoteNotificationTypes];
        if (types & UIRemoteNotificationTypeAlert) {
            isEnabled = YES;
        } else{
            isEnabled = NO;
        }
    }

    return isEnabled;
}