iOS系统的底层通知框架库示例详解

//基于block处理的通知注册uint32_t notify_register_dispatch(const char *name, int *out_token, dispatch_queue_t queue, notify_handler_t handler)//基于信号处理的通知注册uint32_t notify_register_signal(const char *name, int sig, int *out_token);//基于mach port消息的通知注册uint32_t notify_register_mach_port(const char *name, mach_port_t *notify_port, int flags, int *out_token);//基于文件描述符的通知注册。uint32_t notify_register_file_descriptor(const char *name, int *notify_fd, int flags, int *out_token);

 uint32_t notify_post(const char *name);

//通知的暂停，设置后此token将暂时不会接受消息的通知。uint32_t notify_suspend(int token)//通知的恢复，设置后此token将恢复接受消息的通知。uint32_t notify_resume(int token)//通知的取消，设置后此token将不再接受消息的通知。uint32_t notify_cancel(int token);

//注册一个通知消息检测的token。 uint32_t notify_register_check(const char *name, int *out_token);//检测这个token所对应的通知消息是否被发送过。如果通知消息被发送过则check返回1，否则返回0。 uint32_t notify_check(int token, int *check);

 uint32_t notify_set_state(int token, uint64_t state64) uint32_t notify_get_state(int token, uint64_t *state64)

#include <notify.h>#include <notify_keys.h>void foo(){  int token1, token2, token3;  //注册监听网络状态改变的通知。  notify_register_dispatch(kNotifySCNetworkChange, & token1, dispatch_get_main_queue(), ^(int token) {    //...  });       //注册监听系统磁盘空间不足的通知  notify_register_dispatch(kNotifyVFSLowDiskSpaceRootFS, &token2, dispatch_get_main_queue(), ^(int token) {    //....  });     //注册监听系统时间被改变的通知。  notify_register_dispatch(kNotifyClockSet, &token3, dispatch_get_main_queue(), ^(int token) {    //...  });  }

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