iOS 绑定系统日历，并且添加提醒事件

好久没有更新啦，最近沉迷于加班，无法自拔，现在程序媛上线了~

一、背景

前几天有个需求，需要用户点击一个开启日历的按钮，然后将当前的事件和系统日历绑定，并且在连续的几天的中午12点给用户提醒消息，OK，废话不多说，上代码

二、实现方式

1、首先在info.plist文件中添加权限

Privacy - Calendars Usage Description 访问日历的权限
Privacy - Reminders Usage Description 访问提醒事件的权限

2、判断是否有权限

class EventCalendar: NSObject {
    //单例
    static let eventStore = EKEventStore()
    
    ///用户是否授权使用日历
    func isEventStatus() -> Bool {
        let eventStatus = EKEventStore.authorizationStatus(for: EKEntityType.event)
        if eventStatus == .denied || eventStatus == .restricted {
            return false
        }
        return true
    }
}

EventCalendar.eventStore.requestAccess(to: EKEntityType.event) { [unowned self] (granted, error) in
//用户没授权
                if !granted {
                    let alertViewController = UIAlertController(title: "提示", message: "请在iPhone的\"设置->隐私->日历\"选项中,允许***访问你的日历。", preferredStyle: .alert)
                    let actionCancel = UIAlertAction(title: "取消", style: .cancel, handler: { (action) in
                    })
                    let actinSure = UIAlertAction(title: "设置", style: .default, handler: { (action) in
                        //跳转到系统设置主页
                        if let url = URL(string: UIApplicationOpenSettingsURLString) {
                            //根据iOS系统版本，分别处理
                            if #available(iOS 10, *) {
                                UIApplication.shared.open(url)
                            } else {
                                UIApplication.shared.openURL(url)
                            }
                        }
                    })
                    alertViewController.addAction(actionCancel)
                    alertViewController.addAction(actinSure)
                    self.present(alertViewController, animated: true, completion: nil)
                    return
                }
}

3、获取第二天中午12点的date

func getTomorrowDate(_ timeCount: Int, dayCount: Int) -> Date {
        let calendar = NSCalendar.current
        var componts = calendar.dateComponents([.weekday, .year, .month, .day], from: Date())
        guard let day = componts.day else {
            return Date()
        }
        componts.day = day + dayCount
        let tomorrowInterval: TimeInterval = TimeInterval((calendar.date(from: componts)?.timeIntervalSince1970 ?? 0) + TimeInterval(timeCount * 60 * 60))
        let dateFormatter = DateFormatter()
        dateFormatter.dateFormat = "yyyy-MM-dd HH:mm:ss"
        let tomorrowDate = Date(timeIntervalSince1970: tomorrowInterval)
        return tomorrowDate
    }

最后附上Demo