1. WKWebView 的问题
1.1. 不能管理 cookies
每次 request 的时候把 cookies 设置进去
1.2. 缓存问题
WKWebView会忽视默认的网络存储， NSURLCache, NSHTTPCookieStorage, NSCredentialStorage。 目前是这样的，WKWebView有自己的进程，同样也有自己的存储空间用来存储cookie和cache， 其他的网络类如NSURLConnection是无法访问到的。导致无法自定义请求。这样导致了在使用时遇到了H5页面修改了，APP却没有更新到，想清理缓存却无从下手，
方法一：url后面加上时间戳， 方法二：iOS9之后WKWebView才有清除缓存的方法：
if ([[[UIDevicecurrentDevice] systemVersion]intValue ] > 8) {
NSArray * types =@[WKWebsiteDataTypeMemoryCache,WKWebsiteDataTypeDiskCache]; // 9.0之后才有的
NSSet *websiteDataTypes = [NSSetsetWithArray:types];
NSDate *dateFrom = [NSDatedateWithTimeIntervalSince1970:0];
[[WKWebsiteDataStoredefaultDataStore] removeDataOfTypes:websiteDataTypesmodifiedSince:dateFrom completionHandler:^{
}];
}else{
NSString *libraryPath = [NSSearchPathForDirectoriesInDomains(NSLibraryDirectory,NSUserDomainMask, YES) objectAtIndex:0];
NSString *cookiesFolderPath = [libraryPathstringByAppendingString:@"/Cookies"];
NSLog(@"%@", cookiesFolderPath);
NSError *errors;
[[NSFileManagerdefaultManager] removeItemAtPath:cookiesFolderPatherror:&errors];
}
1.3. WKWebView发起的资源请求也是不经过NSURLProtocol
1.4. POST请求无法发送参数
- 使用NSURLSession解决WKWebView无法POST参数的问题（性能和结果都可能有问题，不推荐使用）
- 使用JavaScript解决WKWebView无法发送POST参数问题
1.5. alert() 不起作用
要实现
WKUIDelegate的- (void)webView:(WKWebView *)webView runJavaScriptAlertPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(void))completionHandler方法
1.6. 跨域
WKNavigationDelegate的- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler
1.7. 一个可点击的标签带有 target='_blank' 时，导致WKWebView无法加载点击后的网页的问题
解决办法：
- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler {
if (!navigationAction.targetFrame.isMainFrame) {
[webView evaluateJavaScript:@"var a = document.getElementsByTagName('a');for(var i=0;i<a.length;i++){a[i].setAttribute('target','');}" completionHandler:nil];
}
decisionHandler(WKNavigationActionPolicyAllow);
}
1.8. 一些特殊应用：tel://，mailto://，微信的，自定义协议 不会跳转
解决办法：
- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler {
NSURL *URL = navigationAction.request.URL;
if ([self externalAppRequiredToOpenURL:URL]) {
if ([[UIApplication sharedApplication] canOpenURL:URL]) {
[[UIApplication sharedApplication] openURL:URL];
decisionHandler(WKNavigationActionPolicyCancel);
return;
}
} else {
if (!navigationAction.targetFrame) {
[webView loadRequest:navigationAction.request];
decisionHandler(WKNavigationActionPolicyCancel);
return;
}
}
decisionHandler(WKNavigationActionPolicyAllow);
}
/**
是否为打开外部 App
@param URL URL description
@return YES: 是的
*/
- (BOOL)externalAppRequiredToOpenURL:(NSURL *)URL {
NSString *scheme = URL.scheme;
if (scheme.length) {
NSSet *validSchemes = [NSSet setWithArray:@[@"http", @"https"]];
return ![validSchemes containsObject:URL.scheme];
} else {
return NO;
}
}
1.9. 不支持 keyboardDisplayRequiresUserAction
添加
+ (void)load {
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
// support keyboardDisplayRequiresUserAction
SEL sel = sel_getUid("_startAssistingNode:userIsInteracting:blurPreviousNode:userObject:");
Class WKContentView = NSClassFromString(@"WKContentView");
Method method = class_getInstanceMethod(WKContentView, sel);
IMP originalImp = method_getImplementation(method);
IMP imp = imp_implementationWithBlock(^void(id me, void* arg0, BOOL arg1, BOOL arg2, id arg3) {
((void (*)(id, SEL, void*, BOOL, BOOL, id))originalImp)(me, sel, arg0, TRUE, arg2, arg3);
});
method_setImplementation(method, imp);
});
}
1.10. 没有 scalesPageToFit 参数
1.11. 本地文件 iframe 间通信报跨域错误
SecurityError (DOM Exception 18): Blocked a frame with origin "null" from accessing a frame with origin "null". Protocols, domains, and ports must match.
解决不了
1.12. Other
忘了是做什么用的了
if (navigationAction.navigationType == WKNavigationTypeLinkActivated && [url.scheme isEqualToString:@"https"]) {
[[UIApplication sharedApplication] openURL:url];
decisionHandler(WKNavigationActionPolicyCancel);
return;
}