How to remove cache in WKWebview?

问题:

Any one worked with WKWebview and tried to clear cache ? If yes, how to do? any example ?

P.S. : Normal NSURLCache is not working.

回答1:

In iOS 9

//// Optional data
NSSet *websiteDataTypes
= [NSSet setWithArray:@[
                        WKWebsiteDataTypeDiskCache,
                        //WKWebsiteDataTypeOfflineWebApplicationCache,
                        WKWebsiteDataTypeMemoryCache,
                        //WKWebsiteDataTypeLocalStorage,
                        //WKWebsiteDataTypeCookies,
                        //WKWebsiteDataTypeSessionStorage,
                        //WKWebsiteDataTypeIndexedDBDatabases,
                        //WKWebsiteDataTypeWebSQLDatabases,
                        //WKWebsiteDataTypeFetchCache, //(iOS 11.3, *)
                        //WKWebsiteDataTypeServiceWorkerRegistrations, //(iOS 11.3, *)
                        ]];
//// All kinds of data
//NSSet *websiteDataTypes = [WKWebsiteDataStore allWebsiteDataTypes];
//// Date from
NSDate *dateFrom = [NSDate dateWithTimeIntervalSince1970:0];
//// Execute
[[WKWebsiteDataStore defaultDataStore] removeDataOfTypes:websiteDataTypes modifiedSince:dateFrom completionHandler:^{
   // Done
}];

回答2:

Swift version:

if #available(iOS 9.0, *) {
  let websiteDataTypes = NSSet(array: [WKWebsiteDataTypeDiskCache, WKWebsiteDataTypeMemoryCache])
  let date = NSDate(timeIntervalSince1970: 0)
  WKWebsiteDataStore.defaultDataStore().removeDataOfTypes(websiteDataTypes as! Set<String>, modifiedSince: date, completionHandler:{ })
} else {
    var libraryPath = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.LibraryDirectory, NSSearchPathDomainMask.UserDomainMask, false).first!
    libraryPath += "/Cookies"

    do {
      try NSFileManager.defaultManager().removeItemAtPath(libraryPath)
    } catch {
      print("error")
    }
    NSURLCache.sharedURLCache().removeAllCachedResponses()
}

Swift3 version:

   if #available(iOS 9.0, *)
    {
        let websiteDataTypes = NSSet(array: [WKWebsiteDataTypeDiskCache, WKWebsiteDataTypeMemoryCache])
        let date = NSDate(timeIntervalSince1970: 0)

        WKWebsiteDataStore.default().removeData(ofTypes: websiteDataTypes as! Set<String>, modifiedSince: date as Date, completionHandler:{ })
    }
    else
    {
        var libraryPath = NSSearchPathForDirectoriesInDomains(FileManager.SearchPathDirectory.libraryDirectory, FileManager.SearchPathDomainMask.userDomainMask, false).first!
        libraryPath += "/Cookies"

        do {
            try FileManager.default.removeItem(atPath: libraryPath)
        } catch {
            print("error")
        }
        URLCache.shared.removeAllCachedResponses()
    }

回答3:

You cannot delete caches only with NSURLCache. After much cut-and-try, I could clear caches by the following steps (as of iOS 8.1.1):

1. Use NSURLCache to delete caches in the same way as you used to do on UIWebView. If you use WKProccessPool, re-initialize it.
2. Delete Caches directory in Library.
3. Delete all WKWebViews

Next time you create WKWebView, caches should be cleared.

ShingoFukuyama/WKWebViewTips

回答4:

I was able to solve this issue by having my WKWebView evaluate window.location.reload. I have a tap gesture recognizer on the web view and whenever it detects a double tap with 2 touches, I run the following:

webView.evaluateJavaScript("window.location.reload(true)", completionHandler: nil);

Hope this helps.

回答5:

Something similar for iOS 9.0 and later:

let store: WKWebsiteDataStore = WKWebsiteDataStore.default()
let dataTypes: Set<String> = WKWebsiteDataStore.allWebsiteDataTypes()
store.fetchDataRecords(ofTypes: dataTypes, completionHandler: { (records: [WKWebsiteDataRecord]) in
  store.removeData(ofTypes: dataTypes, for: records, completionHandler: {
    // do your thing here
  })
})

回答6:

Worked
Swift 3. Version.
For Older Version Swift

import Foundation
import WebKit

func removeWebData() {

    if #available(iOS 9.0, *) {

        let websiteDataTypes = WKWebsiteDataStore.allWebsiteDataTypes()
        let date = NSDate(timeIntervalSince1970: 0)

        WKWebsiteDataStore.default().removeData(ofTypes: websiteDataTypes, modifiedSince: date as Date, completionHandler: {
            #if DEBUG

                print("remove all data in iOS9 later")

            #endif
        })

    }else {

        // Remove the basic cache.
        URLCache.shared.removeAllCachedResponses()

        // Delete system cookie store in the app
        let storage = HTTPCookieStorage.shared
        if let cookies = storage.cookies {
            for cookie in cookies {
                storage.deleteCookie(cookie)
            }
        }


        do {
            // folder 를 삭제하는 대신 contents 를 삭제하는 이유?
            // MainVC 가 호출되면 cache, cookie가 발생하므로 로딩시 확인된 cache, cookie 폴더의
            // contents 에 대해서만 삭제 진행.

            // Clear web cache
            try deleteLibraryFolderContents(folder: "Caches")

            // Remove all cookies stored by the site. This includes localStorage, sessionStorage, and WebSQL/IndexedDB.
            try deleteLibraryFolderContents(folder: "Cookies")

            // Removes all app cache storage.
            try deleteLibraryFolder(folder: "WebKit")

        } catch {
            #if DEBUG

                print("Delete library folders error in iOS9 below")

            #endif

        }
    }
}

/**
 Delete folder in library

 - parameter folder: a folder you want to delete

 - throws: throws an error
 */
func deleteLibraryFolder(folder: String) throws {
    let manager = FileManager.default
    let library = manager.urls(for: .libraryDirectory, in: .userDomainMask).first!
    let dir = library.appendingPathComponent(folder)
    try manager.removeItem(at: dir)
}

/**
 Delete contents in library folder

 - parameter folder: target folder

 - throws: throws an error
 */
private func deleteLibraryFolderContents(folder: String) throws {
    let manager = FileManager.default
    let library = manager.urls(for: FileManager.SearchPathDirectory.libraryDirectory, in: .userDomainMask)[0]
    let dir = library.appendingPathComponent(folder)
    let contents = try manager.contentsOfDirectory(atPath: dir.path)
    for content in contents {
        do {
            try manager.removeItem(at: dir.appendingPathComponent(content))
        } catch where ((error as NSError).userInfo[NSUnderlyingErrorKey] as? NSError)?.code == Int(EPERM) {
            // "EPERM: operation is not permitted". We ignore this.
            #if DEBUG

                print("Couldn't delete some library contents.")

            #endif
        }
    }
}

回答7:

It works for me

 if #available(iOS 9.0, *) {
            let websiteDataTypes = NSSet(array: [WKWebsiteDataTypeDiskCache, WKWebsiteDataTypeMemoryCache])
            let date = NSDate(timeIntervalSince1970: 0)
            WKWebsiteDataStore.defaultDataStore().removeDataOfTypes(websiteDataTypes as! Set<String>, modifiedSince: date, completionHandler:{ })
        }
        else
        {
          NSURLCache.sharedURLCache().removeAllCachedResponses()
        }

回答8:

Swift 3.x version of @Esqarrouth's post

func clearCache() {
    if #available(iOS 9.0, *) {
        let websiteDataTypes = NSSet(array: [WKWebsiteDataTypeDiskCache, WKWebsiteDataTypeMemoryCache])
        let date = NSDate(timeIntervalSince1970: 0)
        WKWebsiteDataStore.default().removeData(ofTypes: websiteDataTypes as! Set<String>, modifiedSince: date as Date, completionHandler:{ })
    } else {
        var libraryPath = NSSearchPathForDirectoriesInDomains(FileManager.SearchPathDirectory.libraryDirectory, FileManager.SearchPathDomainMask.userDomainMask, false).first!
        libraryPath += "/Cookies"

        do {
            try FileManager.default.removeItem(atPath: libraryPath)
        } catch {
            print("error")
        }
        URLCache.shared.removeAllCachedResponses()
    }
}

回答9:

It takes me a few hours, but this works for me! After the loadRequest, I make a reloadFromOrigin! So I force empty cache! [WKWebView loadRequest:request]; [WKWebView reloadFromOrigin];