ios 本地推送

    iOS上有两种消息通知，一种是本地消息（Local Notification），一种是远程消息(Push Notification，也叫Remote Notification)，设计这两种通知的目的都是为了提醒用户，现在有些什么新鲜的事情发生了，吸引用户重新打开应用。本地推送也可以通过服务器控制，比如说如果有新消息了，推送消息，但是，前提是程序必须是打开的，而远程推送，是通过苹果APNS服务器，推送给手机，手机在推送给具体的哪个程序，一般远程推送用到的比较多.

   先介绍本地推送:

//接收本地推送
- ( void )application:(UIApplication *)application didReceiveLocalNotification:(UILocalNotification *)notification{
    NSLog(@ "%@" ,notification.alertBody);
    UILabel*label = [[UILabel alloc]init];
    label.frame = CGRectMake( 0 , 0 , 160 , 20 );
    label.layer.cornerRadius = 10 ;
    label.backgroundColor = [UIColor blackColor];
    label.text = notification.alertBody;
    label.textColor = [UIColor whiteColor];
    label.font = [UIFont systemFontOfSize: 12 ];
    label.textAlignment = NSTextAlignmentCenter;

    [self.window addSubview:label];
}

1.首先，先在appdelegate中注册：

<span style="color:#006600;">- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
 
    [application registerUserNotificationSettings:[UIUserNotificationSettings settingsForTypes:UIUserNotificationTypeAlert|UIUserNotificationTypeBadge|UIUserNotificationTypeSound categories:nil]];//注册本地推送
    return YES;
}</span>

2.然后，在具体的viewcontroller中实现推送：

<span style="color:#006600;">- (IBAction)localPushNow:(id)sender {
  
    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
        //本地推送
        UILocalNotification*notification = [[UILocalNotification alloc]init];
        NSDate * pushDate = [NSDate dateWithTimeIntervalSinceNow:10];
        if (notification != nil) {
            notification.fireDate = pushDate;
            notification.timeZone = [NSTimeZone defaultTimeZone];
            notification.repeatInterval = kCFCalendarUnitDay;
            notification.soundName = UILocalNotificationDefaultSoundName;
            notification.alertBody = @"hello，world";
            notification.applicationIconBadgeNumber = 0;
            NSDictionary*info = [NSDictionary dictionaryWithObject:@"test" forKey:@"name"];
            notification.userInfo = info;
            [[UIApplication sharedApplication] scheduleLocalNotification:notification];
             
        }
    });
 
}</span>

3.在appdelegate中会接收到推送信息：

//接收本地推送
- (void)application:(UIApplication *)application didReceiveLocalNotification:(UILocalNotification *)notification{
    NSLog(@"%@",notification.alertBody);
    UILabel*label = [[UILabel alloc]init];
    label.frame = CGRectMake(0, 0, 160, 20);
    label.layer.cornerRadius = 10;
    label.backgroundColor = [UIColor blackColor];
    label.text = notification.alertBody;
    label.textColor = [UIColor whiteColor];
    label.font = [UIFont systemFontOfSize:12];
    label.textAlignment = NSTextAlignmentCenter;
     
    [self.window addSubview:label];
}

过程中可能会出现如下状况：

Attempting to schedule a local notification……with a sound but haven't received permission from the user to play sounds

Attempting to schedule a local notification……with an alert but haven't received permission from the user to display alerts

可能是因为你没有注册，或者设置中没有开启推送功能，