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
所以标题也可以叫uiwebview的无痛迁移
//
// GsWebView.swift
// iosclient
//
// Created by Yeshen on 16/8/31.
// Copyright © 2016年 L. All rights reserved.
//
import Foundation
import UIKit
import WebKit
protocol 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)
}
}
}
@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
}
}
//
// ProcessPool.swift
// iosclient
//
// Created by Yeshen on 16/9/2.
// Copyright © 2016年 L. All rights reserved.
//
import Foundation
import 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!
}
}
此外，在Target general 的linked frameworks and libraries中要引入webkit.framework
以上，后面有问题再补充修改
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