【移动应用开发技术】iOS如何解决webview加载时序和缓存问题

【移动应用开发技术】iOS如何解决webview加载时序和缓存问题

iOSwebView的加载时序-

(BOOL)webView:(UIWebView

*)webView

shouldStartLoadWithRequest:(NSURLRequest

*)request

navigationType:(UIWebViewNavigationType)navigationType

{

NSLog(@"开始请求webview:%@",request.URL.relativeString);

return

YES;

}

-

(void)webViewDidStartLoad:(UIWebView

*)webView

{

NSLog(@"开始加载webview");

}

-

(void)webViewDidFinishLoad:(UIWebView

*)webView

{

NSLog(@"结束加载webview");

}

-

(void)webView:(UIWebView

*)webView

didFailLoadWithError:(nonnull

NSError

*)error

{

NSLog(@"webView加载失败");

}

WKWebView加载时序:-

(void)webView:(WKWebView

*)webView

decidePolicyForNavigationAction:(WKNavigationAction

*)navigationAction

decisionHandler:(void

(^)(WKNavigationActionPolicy))decisionHandler

{

NSLog(@"webview开始请求");

decisionHandler(WKNavigationActionPolicyAllow);

}

-

(void)webView:(WKWebView

*)webView

didStartProvisionalNavigation:(WKNavigation

*)navigation

{

NSLog(@"webView开始加载");

}

-

(void)webView:(WKWebView

*)webView

decidePolicyForNavigationResponse:(WKNavigationResponse

*)navigationResponse

decisionHandler:(void

(^)(WKNavigationResponsePolicy))decisionHandler

{

NSLog(@"webview开始收到响应");

decisionHandler(WKNavigationResponsePolicyAllow);

}

显示开始加载html

CSS

js

和图片资源等（JS引擎单线程顺序执行）

-

(void)webView:(WKWebView

*)webView

didCommitNavigation:(WKNavigation

*)navigation

{

NSLog(@"1");

}

-

(void)webView:(WKWebView

*)webView

didFinishNavigation:(WKNavigation

*)navigation

{

NSLog(@"webview结束加载内容");

}

-

(void)webView:(WKWebView

*)webView

didFailProvisionalNavigation:(WKNavigation

*)navigation

withError:(NSError

*)error{

NSLog(@"webview加载失败");

}

-

(void)webView:(WKWebView

*)webView

didReceiveServerRedirectForProvisionalNavigation:(WKNavigation

*)navigation{

NSLog(@"开始重定向的函数");

}

-

(void)webView:(WKWebView

*)webView

didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge

*)challenge

completionHandler:(void

(^)(NSURLSessionAuthChallengeDisposition,

NSURLCredential

*))completionHandler

{

NSLog(@"2");

completionHandler(NSURLSessionAuthChallengePerformDefaultHandling,

nil);

}iOSwebView加载html5缓存1.加载html5的过程2.设置清除html5页面缓存/upload/information/20200623/126/121217.png3.设置cssJS文件不从缓存中读取document.write(

"

<script

src='test.js?rnd=

"

+

Math.random()

+

"

'></s

"

+

"

cript>

"

)var

js

=

document.createElement(

"

script

"

)

js.src

=

"

test.js

"

+

Math.random()

document.body.appendChild(js)<script

src="test.js?ver=113"></script>4.iOS清除缓存文件-

(void)removeWebCache{

if

([[UIDevice

currentDevice].systemVersion

floatValue]

>=

9.0)

{

NSSet

*websiteDataTypes=

[NSSet

setWithArray:@[

WKWebsiteDataTypeDiskCache,

//WKWebsiteDataTypeOfflineWebApplication

WKWebsiteDataTypeMemoryCache,

//WKWebsiteDataTypeLocal

WKWebsiteDataTypeCookies,

//WKWebsiteDataTypeSessionStorage,

//WKWebsiteDataTypeIndexedDBDatabases,

//WKWebsiteDataTypeWebSQLDatabases

]];

//

All

kinds

of

data

//NSSet

*websiteDataTypes

=

[WKWebsiteDataStore

allWebsiteDataTypes];

NSDate

*dateFrom

=

[NSDate

dateWithTimeIntervalSince1970:0];

[[WKWebsiteDataStore

defaultDataStore]

removeDataOfTypes:websiteDataTypes

modifiedSince:dateFrom

completionHandler:^{

}];

[[NSURLCache

sharedURLCache]

removeAllCachedResponses];

}

else

{

//先删除cookie

NSHTTPCookie

*cookie;

NSHTTPCookieStorage

*storage

=

[NSHTTPCookieStorage

sharedHTTPCookieStorage];

for

(cookie

in

[storage

cookies])

{

[storage

deleteCookie:cookie];

}

NSString

*libraryDir

=

[NSSearchPathForDirectoriesInDomains(NSLibraryDirectory,

NSUserDomainMask,

YES)

objectAtIndex:0];

NSString

*bundleId

=

[[[NSBundle

mainBundle]

infoDictionary]

objectForKey:@"CFBundleIdentifier"];

NSString

*webkitFolderInLib

=

[NSString

stringWithFormat:@"%@/WebKit",libraryDir];

NSString

*webKitFolderInCaches

=

[NSString

stringWithFormat:@"%@/Caches/%@/WebKit",libraryDir,bundleId];

NSString

*webKitFolderInCachesfs

=

[NSString

stringWithFormat:@"%@/Caches/%@/fsCachedData",libraryDir,bundleId];

NSError

*error;

/*

iOS8.0

WebView

Cache的存放路径

*/

[[NSFileManager

defaultManager]

removeItemAtPath:webKitFolderInCaches

error:&error];

[[NSFileManager

defaultManager]

removeItemAtPath:webkitFolderInLib

error:nil];

/*

iOS7.0

WebView

Cache的存放路径

*/

[[NSFileManager

defaultManager]

removeItemAtPath:webKitFolderInCachesfs

error:&error];

NSString

*cookiesFolderPath

=

[libraryDir

stringByAppendingString:@"/Cookies"];

[[NSFileManager

defaultManager]

removeItemAtPath:cookiesFolderPath

error:&error];

[[NSURLCache

sharedURLCache]

removeAllCachedResponses];

}

}/upload/information/20200623/126/121218.png/upload/information/20200623/126/121219.png

-

(void)webViewDidFinishLoad:(UIWebView

*)webView

{

//防止内存泄漏

[[NSUserDefaults

standardUserDefaults]

setInteger:0

forKey:@"WebKitCacheModelPreferenceKey"];

//本地webkit硬盘图片的缓存；

[[NSUserDefaults

standardUserDefaults]

setBool:NO

forKey:@"WebKitDiskImageCacheEnabled"];//自己添加的，原文没有提到。

//静止webkit离线缓存

[[NSUserDefaults

standardUserDefaults]

setBool:NO

forKey:@"WebKitOfflineWebApplicationCacheEnabled"];//自己添加的，，原文没有提到。

[[NSUserDefaults

standardUserDefaults]

synchronize];

}

-

(void)dealloc

{

[webView

loadHTMLString:@""

baseURL:nil];

[webView

stopLoading];

[webView

removeFromSuperview];

webView

=

nil;

[[NSURLCache

sharedURLCache]

removeAllCachedResponses];

[[NSURLCache

sharedURLCache]

setDiskCapacity:0];

[[NSURLCache

sharedURLCache]

setMemoryCapacity:0];

NSLog(@