swift(ios) webview 的优化

概述最近一直在做手机H5的东西，网页写多了，测试也测出问题来了，打开十几个网页后，app出现无响应，app的webview界面出现黑屏等等奇怪的问题。 我试了几遍，APP内存占用从20M飙升到100M＋，到了100M的时候，xcode被断开了，然后问题就一个个冒出来了-_-!  搜索了一下，是uiwebview内存泄漏，然后我就兼容了wkwebview。 wkwebview遇到的问题主要有几个： 1、

最近一直在做手机H5的东西，网页写多了，测试也测出问题来了，打开十几个网页后，app出现无响应，app的webvIEw界面出现黑屏等等奇怪的问题。

我试了几遍，APP内存占用从20M飙升到100M＋，到了100M的时候，xcode被断开了，然后问题就一个个冒出来了-_-!

搜索了一下，是uiwebvIEw内存泄漏，然后我就兼容了wkwebvIEw。

wkwebvIEw遇到的问题主要有几个：

1、多个wkwebvIEw数据不同步，localstorage在a页面能用，去到b页面能用，在b页面写入东西，在a页面看不到

2、跳转新增webvIEw，加载很慢

3、receiveMemoryWarning 之后，或者一段时间没用之后，返回之前的页面，页面变成空白

我解决了这几个问题，并写了一个替代的兼容webvIEw

@H_301_31@

所以标题也可以叫uiwebvIEw的无痛迁移

@H_301_31@

////  GsWebVIEw.swift//  iosclIEnt////  Created by Yeshen on 16/8/31.//  copyright © 2016年 L. All rights reserved.//import Foundationimport UIKitimport WebKitprotocol GsWebVIEwDelegate{    func webVIEw(webVIEw: GsWebVIEw,shouldStartLoaDWithRequest request: String?) -> Bool    func webVIEwDIDStartLoad(webVIEw: GsWebVIEw)    func webVIEwDIDFinishLoad(webVIEw: GsWebVIEw)    func webVIEw(webVIEw: GsWebVIEw,dIDFailLoaDWithError error: NSError?)}class GsWebVIEw :NSObject,uiwebviewdelegate,WKNavigationDelegate,WKUIDelegate{    var delegate:GsWebVIEwDelegate?    var vIEw:UIVIEw?        init(frame:CGRect) {        super.init()        if #available(iOS 8.0,*) {            let config = WKWebVIEwConfiguration()            config.processpool = Processpool.ins.get()            config.preferences = Processpool.ins.getPreferences()            let v = WKWebVIEw(frame: frame,configuration: config)            v.navigationDelegate = self            v.UIDelegate = self            v.opaque = false            self.vIEw = v        }else{            let v = UIWebVIEw(frame: frame)            v.delegate = self            v.dataDetectorTypes = UIDataDetectorTypes.None            self.vIEw = v        }    }        func loadRequest(url:String){        if let url = NSURL(string: url.EncodeURL()){            let request = NSURLRequest(URL: url)            if #available(iOS 8.0,*) {                if let wkweb = vIEw as? WKWebVIEw {                    wkweb.loadRequest(request)                }            } else {                if let uiweb = vIEw as? UIWebVIEw{                    uiweb.loadRequest(request)                }            }        }    }    func setBackgroundcolor(color:UIcolor){        vIEw?.backgroundcolor = color    }        func getScrollVIEw() -> UIScrollVIEw?{        if #available(iOS 8.0,*) {            if let wkweb = vIEw as? WKWebVIEw {                return wkweb.scrollVIEw            }        } else {            if let uiweb = vIEw as? UIWebVIEw{                return uiweb.scrollVIEw            }        }        return nil    }        func runjs(action:String?){        if #available(iOS 8.0,*) {            if let wkweb = vIEw as? WKWebVIEw {                wkweb.runjs(action)            }        } else {            if let uiweb = vIEw as? UIWebVIEw{                uiweb.runjs(action)            }        }    }        func JavaScriptGet(action:String?,callback:((AnyObject?,NSError?) -> VoID)){        if #available(iOS 8.0,*) {            if let wkweb = vIEw as? WKWebVIEw {                wkweb.JavaScriptGet(action,callback: callback)                return            }        } else {            if let uiweb = vIEw as? UIWebVIEw{                let str = uiweb.JavaScriptGet(action)                callback(str,nil)                return            }        }        callback(nil,nil)    }        func getTitle() -> String{        if #available(iOS 8.0,*) {            if let wkweb = vIEw as? WKWebVIEw {                return wkweb.getTitle()            }        } else {            if let uiweb = vIEw as? UIWebVIEw{                return uiweb.getTitle()            }        }        return Strings.empty    }        func reloadFromOrigin(){        if #available(iOS 8.0,*) {            if let wkweb = vIEw as? WKWebVIEw {                wkweb.reloadFromOrigin()            }        } else {            if let uiweb = vIEw as? UIWebVIEw{                uiweb.reload()            }        }    }        func reload(){        self.reload(nil)    }        func reload(optionalUrl:String?){        if #available(iOS 8.0,*) {            if let wkweb = vIEw as? WKWebVIEw {                if(wkweb.URL == nil && optionalUrl != nil){                    loadRequest(optionalUrl!)                    return                }                wkweb.reload()            }        } else {            if let uiweb = vIEw as? UIWebVIEw{                uiweb.reload()            }        }    }        func canGoBack() -> Bool{        if #available(iOS 8.0,*) {            if let wkweb = vIEw as? WKWebVIEw {                return wkweb.canGoBack            }        } else {            if let uiweb = vIEw as? UIWebVIEw{                return uiweb.canGoBack            }        }        return false    }        func goBack() {        if #available(iOS 8.0,*) {            if let wkweb = vIEw as? WKWebVIEw {                wkweb.goBack()            }        } else {            if let uiweb = vIEw as? UIWebVIEw{                uiweb.goBack()            }        }    }        //call on vIEwDIDAppear    //for wkwebvIEw'BUG : Blank screen after running app for a while    var ensure:Int = 0    func ensurePageValID(){        if #available(iOS 8.0,*) {            ensure++            if(ensure > 1){                JavaScriptGet("document.body.children.length > 0",callback: {(data,error) -> VoID in                    var isVaild = true                    if(error == nil && data != nil){                        if let vaild = data as? Bool{                            isVaild = vaild                        }                    }else if(error != nil){                        if(error?.domain == WKErrorDomain && error?.code == 1){                            isVaild = false                        }                    }                    if(!isVaild){                        NSOperationQueue.mainQueue().addOperationWithBlock({()-> VoID in                            self.reloadFromOrigin()                        })                    }                })            }        }else{            //ignore it        }    }    /////////////    func webVIEw(webVIEw: UIWebVIEw,shouldStartLoaDWithRequest request: NSURLRequest,navigationType: UIWebVIEwNavigationType) -> Bool{        if delegate != nil,let url = request.URL?.description.DecodeURL(){            return delegate!.webVIEw(self,shouldStartLoaDWithRequest: url)        }        return true    }    @available(iOS 8.0,*)    func webVIEw(webVIEw: WKWebVIEw,decIDePolicyForNavigationAction navigationAction: WKNavigationAction,decisionHandler: (WKNavigationActionPolicy) -> VoID){        var policy = WKNavigationActionPolicy.Allow        if delegate != nil,let url = navigationAction.request.URL?.deBUGDescription.DecodeURL(){            if(!delegate!.webVIEw(self,shouldStartLoaDWithRequest: url)){                policy = WKNavigationActionPolicy.Cancel            }        }        decisionHandler(policy)    }        //////////////    func webVIEwDIDStartLoad(webVIEw: UIWebVIEw){        if delegate != nil{            delegate?.webVIEwDIDStartLoad(self)        }    }    @available(iOS 8.0,dIDCommitNavigation navigation: WKNavigation!){        if delegate != nil{            delegate?.webVIEwDIDStartLoad(self)        }    }        ////////////    func webVIEwDIDFinishLoad(webVIEw: UIWebVIEw){        if delegate != nil{            delegate?.webVIEwDIDFinishLoad(self)        }    }    @available(iOS 8.0,dIDFinishNavigation navigation: WKNavigation!){        if delegate != nil{            delegate?.webVIEwDIDFinishLoad(self)        }    }    //////////////    func webVIEw(webVIEw: UIWebVIEw,dIDFailLoaDWithError error: NSError?){        if delegate != nil{            delegate?.webVIEw(self,dIDFailLoaDWithError: error)        }    }    @available(iOS 8.0,dIDFailNavigation navigation: WKNavigation!,withError error: NSError){        if delegate != nil{            delegate?.webVIEw(self,dIDFailProvisionalNavigation navigation: WKNavigation!,dIDFailLoaDWithError: error)        }    }    }

@H_301_31@

@available(iOS 8.0,*)extension WKWebVIEw{    func JavaScriptGet(Jscode:String?,NSError?) -> VoID)?) -> String?{        if let Js = Jscode{            self.evaluateJavaScript("JavaScript:" + Js,completionHandler: callback)        }        return nil    }    func runjs(Jscode:String?){        if let Js = Jscode{            self.evaluateJavaScript("JavaScript:" + Js,completionHandler: {(error,data) -> VoID in            })        }    }    func getTitle() -> String{        return self.Title == nil ? Strings.empty : self.Title!    }}extension UIWebVIEw{    func JavaScriptGet(Jscode:String?) -> String?{        if let Js = Jscode{            return self.stringByEvaluatingJavaScriptFromString("JavaScript:" + Js)        }        return nil    }    func runjs(Jscode:String?){        if let Js = Jscode{            self.stringByEvaluatingJavaScriptFromString("JavaScript:" + Js)        }    }    func getTitle() -> String{        if let Title = stringByEvaluatingJavaScriptFromString("document.Title"){            return Title        }        return Strings.empty    }}

@H_301_31@

////  Processpool.swift//  iosclIEnt////  Created by Yeshen on 16/9/2.//  copyright © 2016年 L. All rights reserved.//import Foundationimport WebKit@available(iOS 8.0,*)class LandowProcesspool {        private var pool:WKProcesspool?    private var preferences:WKPreferences?        class var ins: Processpool{        struct Static {            static var oncetoken:dispatch_once_t = 0            static var instance:Processpool? = nil        }        dispatch_once(&Static.oncetoken){            Static.instance = Processpool()        }        return Static.instance!    }        func get() -> WKProcesspool{        if(pool != nil){            return pool!        }        pool = WKProcesspool()        return pool!    }        func getPreferences() ->WKPreferences{        if(preferences != nil){            return preferences!        }        preferences = WKPreferences()        return preferences!    }        }

@H_301_31@

此外，在Target general 的linked frameworks and librarIEs中要引入webkit.framework

@H_301_31@

以上，后面有问题再补充修改

总结

以上是内存溢出为你收集整理的swift(ios) webview 的优化全部内容，希望文章能够帮你解决swift(ios) webview 的优化所遇到的程序开发问题。

如果觉得内存溢出网站内容还不错，欢迎将内存溢出网站推荐给程序员好友。