iOS 推送之APP通知开关状态的监控

点击switch-->跳转到设置页 -->改变通知状态-->返回app刷新switch状态

用户点击开关，switch的状态切换动画会与跳转到设置页的转场动画同时进行，而且会看到switch的状态切换，体验很不好。
解决方案：
在switch上放一个透明button，由button来处理用户事件，而switch只用于展示通知开闭状态

// 在switch上add一个透明button
UIButton *button = [[UIButton alloc] initWithFrame:_notifSwitch.bounds];
[_notifSwitch addSubview:button];
[button addTarget:self action:@selector(switchButtonClicked) forControlEvents:UIControlEventTouchUpInside];

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(refreshSwitch) name:UIApplicationWillEnterForegroundNotification object:nil];


- (void)switchButtonClicked {
    // 跳转到系统设置
    NSURL *settingURL = [NSURL URLWithString:UIApplicationOpenSettingsURLString];
    if (@available(iOS 10.0, *)) {
        [[UIApplication sharedApplication] openURL:settingURL options:[NSDictionary dictionary] completionHandler:nil];
    } else {//iOS10之前
        [[UIApplication sharedApplication] openURL:settingURL];
    }
}

- (void) refreshSwitch {
  UIUserNotificationSettings *setting = [[UIApplication sharedApplication] currentUserNotificationSettings];
  self.notifSwitch.on = (setting.types != UIUserNotificationTypeNone);
}

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