iOS8之后有了WKWebView,相信都知道WKWebView比UIWebView性能好很多,然而真正用起来,你会发现WKWebView各种坑...我曾经有几次想换回UIWebView,网上看了各种关于WKWebView的,发现很多最终都换回了UIWebView...
下面将踩过的坑记录下
- 关于Cookie同步
- WKWebView有自己的缓存机制,如果想同步session需要注意一下几个地方
1.使用全局的processPool,
@interface XXWebKitSupport : NSObject
@property (nonatomic, strong,readonly) WKProcessPool *processPool;
+ (instancetype)sharedSupport;
+ (WKWebView *)createSharableWKWebView;
@end
@interface XXWebKitSupport ()
@property (nonatomic, strong) WKProcessPool *processPool;
@end
@implementation XXWebKitSupport
+ (instancetype)sharedSupport {
static XXWebKitSupport *_instance;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
_instance = [XXWebKitSupport new];
});
return _instance;
}
- (instancetype)init {
if (self = [super init]) {
self.processPool = [WKProcessPool new];
}
return self;
}
+ (WKWebView *)createSharableWKWebView {
WKUserContentController* userContentController = [WKUserContentController new];
NSMutableString *cookies = [NSMutableString string];
WKUserScript * cookieScript = [[WKUserScript alloc] initWithSource:[cookies copy]
injectionTime:WKUserScriptInjectionTimeAtDocumentStart
forMainFrameOnly:NO];
[userContentController addUserScript:cookieScript];
WKWebViewConfiguration *configuration = [WKWebViewConfiguration new];
// 一下两个属性是允许H5视屏自动播放,并且全屏,可忽略
configuration.allowsInlineMediaPlayback = YES;
configuration.mediaPlaybackRequiresUserAction = NO;
// 全局使用同一个processPool
configuration.processPool = [[XXWebKitSupport sharedSupport] processPool];
configuration.userContentController = userContentController;
WKWebView *wk_webView = [[WKWebView alloc] initWithFrame:CGRectZero configuration:configuration];
return wk_webView;
}
- 在WKNavigationDelegate代理方法中将cookie设置到本地
- (void)webView:(WKWebView *)webView decidePolicyForNavigationResponse:(WKNavigationResponse *)navigationResponse decisionHandler:(void (^)(WKNavigationResponsePolicy))decisionHandler{
NSHTTPURLResponse *response = (NSHTTPURLResponse *)navigationResponse.response;
// 获取cookie,并设置到本地
NSArray *cookies =[NSHTTPCookie cookiesWithResponseHeaderFields:[response allHeaderFields] forURL:response.URL];
for (NSHTTPCookie *cookie in cookies) {
[[NSHTTPCookieStorage sharedHTTPCookieStorage] setCookie:cookie];
}
decisionHandler(WKNavigationResponsePolicyAllow);
}
3.在WKWebView加载请求的时候注入Cookie
NSURL *url = [NSURL URLWithString:urlString];
NSMutableString *cookies = [NSMutableString string];
NSMutableURLRequest *requestObj = [NSMutableURLRequest requestWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:10];
// 一般都只需要同步JSESSIONID,可视不同需求自己做更改
NSString * JSESSIONID;
// 获取本地所有的Cookie
NSArray *tmp = [[NSHTTPCookieStorage sharedHTTPCookieStorage] cookies];
for (NSHTTPCookie * cookie in tmp) {
if ([cookie.name isEqualToString:@"JSESSIONID"]) {
JSESSIONID = cookie.value;
break;
}
}
if (JSESSIONID.length) {
// 格式化Cookie
[cookies appendFormat:@"JSESSIONID=%@;",JSESSIONID];
}
// 注入Cookie
[requestObj setValue:cookies forHTTPHeaderField:@"Cookie"];
// 加载请求
[self.wk_webView loadRequest:requestObj];
4.经过以上几步已经可以同步Cookie了,第一次请求是没有jsessionid的,服务器会返回一个给你,然后我们在代理方法中的response中拦截并注入到本地,在下一次加载的时候再从本地取出并注入,从而达到同步Cookie的目的
之前有试过在创建WKWebView的时候使用js脚本注入,但是没有成功,代码如下,
+ (WKWebView *)_createContentSharableWKWebView
{
WKUserContentController* userContentController = [WKUserContentController new];
NSMutableString *cookies = [NSMutableString string];
NSDictionary *constantCookies = [[self sharedSupport] constantCookies];
[constantCookies enumerateKeysAndObjectsUsingBlock:^(NSString *key, NSString *obj, BOOL *stop) {
[cookies appendFormat:@"document.cookie='%@=%@';\n", key, obj];
}];
WKUserScript * cookieScript = [[WKUserScript alloc] initWithSource:[cookies copy]
injectionTime:WKUserScriptInjectionTimeAtDocumentStart
forMainFrameOnly:NO];
[userContentController addUserScript:cookieScript];
WKWebViewConfiguration *configuration = [WKWebViewConfiguration new];
configuration.processPool = [[_SFWebKitSupport sharedSupport] processPool];
configuration.userContentController = userContentController;
WKWebView *wk_webView = [[WKWebView alloc] initWithFrame:CGRectZero configuration:configuration];
return wk_webView;
}
具体什么原因导致的,我也不是很清楚,希望知道的朋友告知~,也有可能是因为我项目的需求是同步jsessionid导致的,因为jsessionid是HtppOnly,不允许通过js脚本修改,
此为踩坑第一篇,回头再继续第二篇
