iOS 检查推送是否打开&跳转到设置页面

UIApplication+Extensions.swift

//
//  UIApplication+Extensions.swift
//
//  Created by Jiang,Zhenhua on 2018/12/17.
//  Copyright © 2018 Daubert. All rights reserved.
//

import UIKit
import UserNotifications

extension UIApplication {
    
    static func isPushNotificationEnabled(completionHandler: @escaping ((Bool) -> Void)) {
        if #available(iOS 10.0, *) {
            UNUserNotificationCenter.current().getNotificationSettings {
                completionHandler($0.authorizationStatus == .authorized)
            }
        } else {
            completionHandler(shared.currentUserNotificationSettings?.types != .none)
        }
    }
    
    static func isPushNotificationEnabledSync() -> Bool {
        var ret = false
        let sema = DispatchSemaphore(value: 0)
        isPushNotificationEnabled { ret = $0 }
        _ = sema.wait(timeout: .distantFuture)
        return ret
    }
    
    static func openNotificationSetting(completionHandler: ((Bool) -> Void)? = nil) {
        if #available(iOS 10.0, *) {
            if let url = URL(string: UIApplicationOpenSettingsURLString) {
                shared.open(url, options: [:], completionHandler: completionHandler)
            }
        } else if let id = Bundle.main.infoDictionary?["CFBundleIdentifier"] as? String,
            let url = URL(string: "prefs:root=\(id)") {
            completionHandler?(shared.openURL(url))
        }
    }
}