iOS开发——应用图标上显示消息数量

UIApplication *app = [UIApplication sharedApplication];

app.applicationIconBadgeNumber = num;

UIUserNotificationSettings *settings = [UIUserNotificationSettings settingsForTypes:UIUserNotificationTypeBadge categories:nil];

[[UIApplication sharedApplication] registerUserNotificationSettings:settings];

float version = [[[UIDevice currentDevice] systemVersion] floatValue];

if (version >= 8.0) {

　　 UIUserNotificationSettings *settings = [UIUserNotificationSettings settingsForTypes:UIUserNotificationTypeBadge categories:nil];

　　[[UIApplication sharedApplication] registerUserNotificationSettings:settings];

}