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iOS - 判断用户是否允许推送通知(iOS7/iOS8)

(iOS8中 用户开启的推送通知类型 对应的是 UIUserNotificationType (下边代码中 UIUserNotificationSettings 的types属性的类型) ,iOS7对应的是 UIRemoteNotificationType)

此处以iOS8的UIUserNotificationType为例,(如下图)当本地通知或push/远程通知 推送时,这个常量指明了app如何去提醒用户(比如:Badge,Sound,Alert的组合)

iOS - 判断用户是否允许推送通知(iOS7/iOS8)

那么如何获得呢,在iOS8中是通过types属性,[[UIApplication sharedApplication] currentUserNotificationSettings].types

iOS - 判断用户是否允许推送通知(iOS7/iOS8)

如上图,获得之后,我们要知道的是这个property储存了所有你指定的推送类型(Badge,Sound,Alert),而在图一中我们知道了推送类型对应的bitmask:(以四位二进制为例)

UIUserNotificationTypeNone     = 0 ,             == 0000                                 0

UIUserNotificationTypeBadge = 1 << 0 ,     == 0001      1左移0位     2^0 = 1

UIUserNotificationTypeSound = 1 << 1 ,     == 0010      1左移1位     2^1 = 2 

UIUserNotificationTypeAlert = 1 << 2 ,   == 0100      1左移2位    2^2 = 4

(以前老师教c语言的时候说过,还可以把左移当做乘2,右移除2)

假如用户勾选推送时显示badge和提示sound,那么types的值就是3(1+2) ==  0001 & 0010 =  0011    ==  2^0 + 2 ^1 = 3

所以,如果用户没有允许推送,types的值必定为0

 1 /**  2  *  check if user allow local notification of system setting  3  *  4  *  @return YES-allowed,otherwise,NO.  5  */  6 + (BOOL)isAllowedNotification {  7     //iOS8 check if user allow notification  8     if ([UIDevice isSystemVersioniOS8]) {// system is iOS8  9         UIUserNotificationSettings *setting = [[UIApplication sharedApplication] currentUserNotificationSettings]; 10         if (UIUserNotificationTypeNone != setting.types) { 11             return YES; 12         } 13     } else {//iOS7 14         UIRemoteNotificationType type = [[UIApplication sharedApplication] enabledRemoteNotificationTypes]; 15         if(UIRemoteNotificationTypeNone != type) 16             return YES; 17     } 18      19     return NO; 20 }

下面这个方法我是添加在UIDecive的Category中的,用于判断当前系统版本是大于iOS8还是小于iOS8的

 1 /**  2  *  check if the system version is iOS8  3  *  4  *  @return YES-is iOS8,otherwise,below iOS8  5  */  6 + (BOOL)isSystemVersioniOS8 {  7     //check systemVerson of device  8     UIDevice *device = [UIDevice currentDevice];  9     float sysVersion = [device.systemVersion floatValue]; 10      11     if (sysVersion >= 8.0f) { 12         return YES; 13     } 14     return NO; 15 }
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