iOS中判断消息推送是否打开

根据 [[UIApplication sharedApplication] enabledRemoteNotificationTypes] 的返回值来进行判断，该返回值是一个枚举值，如下：
typedef enum {
UIRemoteNotificationTypeNone = 0,
UIRemoteNotificationTypeBadge = 1 << 0,
UIRemoteNotificationTypeSound = 1 << 1,
UIRemoteNotificationTypeAlert = 1 << 2,
UIRemoteNotificationTypeNewsstandContentAvailability = 1 << 3,
} UIRemoteNotificationType;
如果是 UIRemoteNotificationTypeNone ，则可以认为推送开关没有打开，反之亦然。

update
ios8以后以上方法废弃
使用
UIUserNotificationSettings *settings = [[UIApplication sharedApplication]currentUserNotificationSettings];

if (settings.types==UIUserNotificationTypeNone) {

//关闭了

}