iOS应用角标的使用

第一步：导入头文件

#import <UserNotifications/UserNotifications.h>
#import <notify.h>

同时要遵循<UNUserNotificationCenterDelegate>

第二步： 获取通知权限

UNUserNotificationCenter *center = [UNUserNotificationCenter currentNotificationCenter];
center.delegate = self; // 必须写代理，不然无法监听通知的接收与点击
[center requestAuthorizationWithOptions:(UNAuthorizationOptionAlert | UNAuthorizationOptionBadge | UNAuthorizationOptionSound) completionHandler:^(BOOL granted, NSError * _Nullable error) {
    if (granted) {
          // 点击允许 注册成功
        [center getNotificationSettingsWithCompletionHandler:^(UNNotificationSettings * _Nonnull settings) {
       }];
    } else {
          // 点击不允许 注册失败
    }
}];

第三步：触发通知

// 新建通知内容对象（可以有内容、声音、图像等）
UNMutableNotificationContent* content = [[UNMutableNotificationContent alloc] init];
content.title = @"当前位置更新";
content.body = self.currentAddress;
content.sound = [UNNotificationSound defaultSound]; // 默认通知声音

// 通知触发机制。（重复提醒，时间间隔要大于60s
UNTimeIntervalNotificationTrigger *trigger = [UNTimeIntervalNotificationTrigger triggerWithTimeInterval:3.0 repeats:NO];

// 创建UNNotificationRequest通知请求对象
UNNotificationRequest* request = [UNNotificationRequest requestWithIdentifier:requestIdentiferForLocation content:content trigger:trigger];

// 将通知加到通知中心
[[UNUserNotificationCenter currentNotificationCenter] addNotificationRequest:request withCompletionHandler:nil];

// 修改角标
[UIApplication sharedApplication].applicationIconBadgeNumber = 1;