ios 设置 applicationIconBadgeNumber(多少消息未读)

先加权限

UIUserNotificationSettings *mySettings = [UIUserNotificationSettings settingsForTypes:UIUserNotificationTypeBadge categories:nil];
    [[UIApplication sharedApplication] registerUserNotificationSettings:mySettings];
[UIApplication sharedApplication].applicationIconBadgeNumber = 13;

然后推出 显示未读消息13条

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