WKWebView

看看WKWebView的頭文件聲明：

// webview 配置，具體看下面
@property (nonatomic, readonly, copy) WKWebViewConfiguration *configuration;

// 導(dǎo)航代理 
@property (nullable, nonatomic, weak) id <WKNavigationDelegate> navigationDelegate;

// 用戶交互代理
@property (nullable, nonatomic, weak) id <WKUIDelegate> UIDelegate;

// 頁面前進(jìn)宫仗、后退列表
@property (nonatomic, readonly, strong) WKBackForwardList *backForwardList;

// 默認(rèn)構(gòu)造器
- (instancetype)initWithFrame:(CGRect)frame configuration:(WKWebViewConfiguration *)configuration NS_DESIGNATED_INITIALIZER;

// 已不再使用
- (instancetype)initWithCoder:(NSCoder *)coder NS_UNAVAILABLE;

// 與UIWebView一樣的加載請求API
- (nullable WKNavigation *)loadRequest:(NSURLRequest *)request;

// 加載URL
- (nullable WKNavigation *)loadFileURL:(NSURL *)URL allowingReadAccessToURL:(NSURL *)readAccessURL NS_AVAILABLE(10_11, 9_0);

// 直接加載HTML
- (nullable WKNavigation *)loadHTMLString:(NSString *)string baseURL:(nullable NSURL *)baseURL;

// 直接加載data
- (nullable WKNavigation *)loadData:(NSData *)data MIMEType:(NSString *)MIMEType characterEncodingName:(NSString *)characterEncodingName baseURL:(NSURL *)baseURL NS_AVAILABLE(10_11, 9_0);

// 前進(jìn)或者后退到某一頁面
- (nullable WKNavigation *)goToBackForwardListItem:(WKBackForwardListItem *)item;

// 頁面的標(biāo)題，這昆支持KVO的
@property (nullable, nonatomic, readonly, copy) NSString *title;

// 當(dāng)前請求的URL俄精，它是支持KVO的
@property (nullable, nonatomic, readonly, copy) NSURL *URL;

// 標(biāo)識(shí)當(dāng)前是否正在加載內(nèi)容中了赌，它是支持KVO的
@property (nonatomic, readonly, getter=isLoading) BOOL loading;

// 當(dāng)前加載的進(jìn)度晚碾，范圍為[0, 1]
@property (nonatomic, readonly) double estimatedProgress;

// 標(biāo)識(shí)頁面中的所有資源是否通過安全加密連接來加載克伊，它是支持KVO的
@property (nonatomic, readonly) BOOL hasOnlySecureContent;

// 當(dāng)前導(dǎo)航的證書鏈，支持KVO
@property (nonatomic, readonly, copy) NSArray *certificateChain NS_AVAILABLE(10_11, 9_0);

// 是否可以招待goback操作季研，它是支持KVO的
@property (nonatomic, readonly) BOOL canGoBack;
// 是否可以執(zhí)行g(shù)ofarward操作，支持KVO
@property (nonatomic, readonly) BOOL canGoForward;

// 返回上一頁面叛溢，如果不能返回膏潮，則什么也不干
- (nullable WKNavigation *)goBack;

// 進(jìn)入下一頁面，如果不能前進(jìn)掌腰，則什么也不干
- (nullable WKNavigation *)goForward;

// 重新載入頁面
- (nullable WKNavigation *)reload;

// 重新從原始URL載入
- (nullable WKNavigation *)reloadFromOrigin;

// 停止加載數(shù)據(jù)
- (void)stopLoading;

// 執(zhí)行JS代碼
- (void)evaluateJavaScript:(NSString *)javaScriptString completionHandler:(void (^ __nullable)(__nullable id, NSError * __nullable error))completionHandler;

// 標(biāo)識(shí)是否支持左狰住、右swipe手勢是否可以前進(jìn)、后退
@property (nonatomic) BOOL allowsBackForwardNavigationGestures;

// 自定義user agent齿梁，如果沒有則為nil
@property (nullable, nonatomic, copy) NSString *customUserAgent NS_AVAILABLE(10_11, 9_0);

// 在iOS上默認(rèn)為NO催植，標(biāo)識(shí)不允許鏈接預(yù)覽
@property (nonatomic) BOOL allowsLinkPreview NS_AVAILABLE(10_11, 9_0);

#if TARGET_OS_IPHONE
/*! @abstract The scroll view associated with the web view.
*/
@property (nonatomic, readonly, strong) UIScrollView *scrollView;
#endif

#if !TARGET_OS_IPHONE
// 標(biāo)識(shí)是否支持放大手勢，默認(rèn)為NO
@property (nonatomic) BOOL allowsMagnification;

// 放大因子勺择，默認(rèn)為1
@property (nonatomic) CGFloat magnification;

// 根據(jù)設(shè)置的縮放因子來縮放頁面创南，并居中顯示結(jié)果在指定的點(diǎn)
- (void)setMagnification:(CGFloat)magnification centeredAtPoint:(CGPoint)point;

#endif

WKWebViewConfiguration配置

WKWebViewConfiguration *config = [[WKWebViewConfiguration alloc] init];

WKPreferences偏好設(shè)置

目前在iOS平臺(tái)上偏好設(shè)置只有三個(gè)屬性可以設(shè)置，如下：

// 設(shè)置偏好設(shè)置
config.preferences = [[WKPreferences alloc] init];
// 默認(rèn)為0
config.preferences.minimumFontSize = 10;
// 默認(rèn)認(rèn)為YES
config.preferences.javaScriptEnabled = YES;
// 在iOS上默認(rèn)為NO省核，表示不能自動(dòng)通過窗口打開
config.preferences.javaScriptCanOpenWindowsAutomatically = NO;

WKProcessPool內(nèi)容處理池

WKProcessPool并沒有公開任何的屬性或者方法稿辙，不需要配置：

config.processPool = [[WKProcessPool alloc] init];

其實(shí)我們也沒有必須去創(chuàng)建它。

WKUserContentController內(nèi)容交互控制器

我們要通過JS與webview內(nèi)容交互气忠，就需要到這個(gè)類了邻储，它的所有屬性及方法說明如下：

// 只讀屬性，所有添加的WKUserScript都在這里可以獲取到
@property (nonatomic, readonly, copy) NSArray<WKUserScript *> *userScripts;

// 注入JS
- (void)addUserScript:(WKUserScript *)userScript;

// 移除所有注入的JS
- (void)removeAllUserScripts;

// 添加scriptMessageHandler到所有的frames中旧噪，則都可以通過
// window.webkit.messageHandlers.<name>.postMessage(<messageBody>)
// 發(fā)送消息
// 比如吨娜，JS要調(diào)用我們原生的方法，就可以通過這種方式了
- (void)addScriptMessageHandler:(id <WKScriptMessageHandler>)scriptMessageHandler name:(NSString *)name;

// 根據(jù)name移除所注入的scriptMessageHandler
- (void)removeScriptMessageHandlerForName:(NSString *)name;

WKUserScript

在WKUserContentController中舌菜，所有使用到WKUserScript萌壳。WKUserContentController是用于與JS交互的類，而所注入的JS是WKUserScript對象日月。它的所有屬性和方法如下：

// JS源代碼
@property (nonatomic, readonly, copy) NSString *source;

// JS注入時(shí)間
@property (nonatomic, readonly) WKUserScriptInjectionTime injectionTime;

// 只讀屬性袱瓮，表示JS是否應(yīng)該注入到所有的frames中還是只有main frame.
@property (nonatomic, readonly, getter=isForMainFrameOnly) BOOL forMainFrameOnly;

// 初始化方法，用于創(chuàng)建WKUserScript對象
// source：JS源代碼
// injectionTime：JS注入的時(shí)間
// forMainFrameOnly：是否只注入main frame
- (instancetype)initWithSource:(NSString *)source injectionTime:(WKUserScriptInjectionTime)injectionTime forMainFrameOnly:(BOOL)forMainFrameOnly;
WKUserScriptInjectionTime

typedef NS_ENUM(NSInteger, WKUserScriptInjectionTime) {
   WKUserScriptInjectionTimeAtDocumentStart,
   WKUserScriptInjectionTimeAtDocumentEnd
} NS_ENUM_AVAILABLE(10_10, 8_0);

它是一個(gè)枚舉類型爱咬，只有在文檔開始加載時(shí)注入和加載結(jié)束時(shí)注入尺借。

WKWebsiteDataStore存儲(chǔ)的Web內(nèi)容

iOS9.0以后才能使用這個(gè)類。它是代表webview不同的數(shù)據(jù)類型精拟，包括cookies燎斩、disk虱歪、memory caches、WebSQL栅表、IndexedDB數(shù)據(jù)庫和本地存儲(chǔ)笋鄙。

從這里看，要優(yōu)化Webview好像可以通過它來實(shí)現(xiàn)怪瓶，不過要求iOS9.0以上才能使用∠袈洌現(xiàn)在6.0都沒有拋棄的我，從來不能考慮這種最新的洗贰。

// 默認(rèn)數(shù)據(jù)存儲(chǔ)
+ (WKWebsiteDataStore *)defaultDataStore;

// 返回非持久化存儲(chǔ)找岖，數(shù)據(jù)不會(huì)寫入文件系統(tǒng)
+ (WKWebsiteDataStore *)nonPersistentDataStore;

// 已經(jīng)不可用
- (instancetype)init NS_UNAVAILABLE;

// 只讀屬性，表示是否是持久化存儲(chǔ)
@property (nonatomic, readonly, getter=isPersistent) BOOL persistent;

// 獲取所有web內(nèi)容的數(shù)據(jù)存儲(chǔ)類型集敛滋，比如cookies许布、disk等
+ (NSSet<NSString *> *)allWebsiteDataTypes;

// 獲取某些指定數(shù)據(jù)存儲(chǔ)類型的數(shù)據(jù)
- (void)fetchDataRecordsOfTypes:(NSSet<NSString *> *)dataTypes completionHandler:(void (^)(NSArray<WKWebsiteDataRecord *> *))completionHandler;

// 刪除某些指定類型的數(shù)據(jù)
- (void)removeDataOfTypes:(NSSet<NSString *> *)dataTypes forDataRecords:(NSArray<WKWebsiteDataRecord *> *)dataRecords completionHandler:(void (^)(void))completionHandler;

// 刪除某些指定類型的數(shù)據(jù)且修改日期是指定的日期
- (void)removeDataOfTypes:(NSSet<NSString *> *)websiteDataTypes modifiedSince:(NSDate *)date completionHandler:(void (^)(void))completionHandler;

所有的dataTypes是下面這些系統(tǒng)所定義的：

WK_EXTERN NSString * const WKWebsiteDataTypeDiskCache NS_AVAILABLE(10_11, 9_0);

WK_EXTERN NSString * const WKWebsiteDataTypeMemoryCache NS_AVAILABLE(10_11, 9_0);

WK_EXTERN NSString * const WKWebsiteDataTypeOfflineWebApplicationCache NS_AVAILABLE(10_11, 9_0);

WK_EXTERN NSString * const WKWebsiteDataTypeCookies NS_AVAILABLE(10_11, 9_0);

WK_EXTERN NSString * const WKWebsiteDataTypeSessionStorage NS_AVAILABLE(10_11, 9_0);

WK_EXTERN NSString * const WKWebsiteDataTypeLocalStorage NS_AVAILABLE(10_11, 9_0);

WK_EXTERN NSString * const WKWebsiteDataTypeWebSQLDatabases NS_AVAILABLE(10_11, 9_0);

WK_EXTERN NSString * const WKWebsiteDataTypeIndexedDBDatabases NS_AVAILABLE(10_11, 9_0);

WKWebsiteDataRecord

iOS9.0以后才可用。

website的數(shù)據(jù)存儲(chǔ)記錄類型绎晃，它只有兩個(gè)屬性：

// 通常是域名
@property (nonatomic, readonly, copy) NSString *displayName;

// 存儲(chǔ)的數(shù)據(jù)類型集
@property (nonatomic, readonly, copy) NSSet<NSString *> *dataTypes;

WKSelectionGranularity選擇粒度

它表示在webview上選擇內(nèi)容的粒度蜜唾，只有下面這兩種類型：

typedef NS_ENUM(NSInteger, WKSelectionGranularity) {
    WKSelectionGranularityDynamic,
    WKSelectionGranularityCharacter,
} NS_ENUM_AVAILABLE_IOS(8_0);

它是用于webview內(nèi)容交互時(shí)選擇內(nèi)容的粒度類型設(shè)置。比如說箕昭，當(dāng)使用WKSelectionGranularityDynamic時(shí)灵妨，而所選擇的內(nèi)容是單個(gè)塊，這時(shí)候granularity可能會(huì)是單個(gè)字符落竹；當(dāng)所選擇的web內(nèi)容不限制于某個(gè)塊時(shí)泌霍，granularity可能會(huì)是單個(gè)塊。

WKNavigationDelegate

@protocol WKNavigationDelegate <NSObject>
@optional
 
// 決定導(dǎo)航的動(dòng)作述召，通常用于處理跨域的鏈接能否導(dǎo)航朱转。WebKit對跨域進(jìn)行了安全檢查限制，不允許跨域积暖，因此我們要對不能跨域的鏈接
// 單獨(dú)處理藤为。但是，對于Safari是允許跨域的夺刑，不用這么處理缅疟。
// 這個(gè)是決定是否Request
- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler;
 
// 決定是否接收響應(yīng)
// 這個(gè)是決定是否接收response
// 要獲取response，通過WKNavigationResponse對象獲取
- (void)webView:(WKWebView *)webView decidePolicyForNavigationResponse:(WKNavigationResponse *)navigationResponse decisionHandler:(void (^)(WKNavigationResponsePolicy))decisionHandler;
 
// 當(dāng)main frame的導(dǎo)航開始請求時(shí)遍愿，會(huì)調(diào)用此方法
- (void)webView:(WKWebView *)webView didStartProvisionalNavigation:(null_unspecified WKNavigation *)navigation;
 
// 當(dāng)main frame接收到服務(wù)重定向時(shí)存淫，會(huì)回調(diào)此方法
- (void)webView:(WKWebView *)webView didReceiveServerRedirectForProvisionalNavigation:(null_unspecified WKNavigation *)navigation;
 
// 當(dāng)main frame開始加載數(shù)據(jù)失敗時(shí)，會(huì)回調(diào)
- (void)webView:(WKWebView *)webView didFailProvisionalNavigation:(null_unspecified WKNavigation *)navigation withError:(NSError *)error;
 
// 當(dāng)main frame的web內(nèi)容開始到達(dá)時(shí)沼填，會(huì)回調(diào)
- (void)webView:(WKWebView *)webView didCommitNavigation:(null_unspecified WKNavigation *)navigation;
 
// 當(dāng)main frame導(dǎo)航完成時(shí)桅咆，會(huì)回調(diào)
- (void)webView:(WKWebView *)webView didFinishNavigation:(null_unspecified WKNavigation *)navigation;
 
// 當(dāng)main frame最后下載數(shù)據(jù)失敗時(shí)，會(huì)回調(diào)
- (void)webView:(WKWebView *)webView didFailNavigation:(null_unspecified WKNavigation *)navigation withError:(NSError *)error;
 
// 這與用于授權(quán)驗(yàn)證的API坞笙，與AFN岩饼、UIWebView的授權(quán)驗(yàn)證API是一樣的
- (void)webView:(WKWebView *)webView didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge completionHandler:(void (^)(NSURLSessionAuthChallengeDisposition disposition, NSURLCredential *__nullable credential))completionHandler;
 
// 當(dāng)web content處理完成時(shí)荚虚，會(huì)回調(diào)
- (void)webViewWebContentProcessDidTerminate:(WKWebView *)webView NS_AVAILABLE(10_11, 9_0);
 
@end
 

WKNavigationActionPolicy

導(dǎo)航動(dòng)作決定策略：

typedef NS_ENUM(NSInteger, WKNavigationActionPolicy) {
    WKNavigationActionPolicyCancel,
    WKNavigationActionPolicyAllow,
} NS_ENUM_AVAILABLE(10_10, 8_0);

它是枚舉類型，只有Cancel和Allow這兩種籍茧。設(shè)置為Cancel就是不允許導(dǎo)航版述，就不會(huì)跳轉(zhuǎn)鏈接。

WKNavigationResponsePolicy

typedef NS_ENUM(NSInteger, WKNavigationResponsePolicy) {
   WKNavigationResponsePolicyCancel,
   WKNavigationResponsePolicyAllow,
} NS_ENUM_AVAILABLE(10_10, 8_0);

WKNavigationResponse

WKNavigationResponse是導(dǎo)航響應(yīng)類硕糊，通過它可以獲取相關(guān)響應(yīng)的信息：

NS_CLASS_AVAILABLE(10_10, 8_0)
@interface WKNavigationResponse : NSObject
 
// 是否是main frame
@property (nonatomic, readonly, getter=isForMainFrame) BOOL forMainFrame;
 
// 獲取響應(yīng)response
@property (nonatomic, readonly, copy) NSURLResponse *response;
 
// 是否顯示MIMEType
@property (nonatomic, readonly) BOOL canShowMIMEType;
 
@end

只有接收響應(yīng)與不接收響應(yīng)兩種院水。

WKNavigationAction

WKNavigationAction對象包含關(guān)于導(dǎo)航的action的信息，用于make policy decisions简十。它只有以下幾個(gè)屬性：

// 正在請求的導(dǎo)航的frame
@property (nonatomic, readonly, copy) WKFrameInfo *sourceFrame;

// 目標(biāo)frame，如果這是新的window撬腾，它會(huì)是nil
@property (nullable, nonatomic, readonly, copy) WKFrameInfo *targetFrame;

// 導(dǎo)航類型螟蝙，如下面的小標(biāo)題WKNavigationType
@property (nonatomic, readonly) WKNavigationType navigationType;

// 導(dǎo)航的請求
@property (nonatomic, readonly, copy) NSURLRequest *request;

WKNavigationType

WKNavigationType類型是枚舉類型，它的可選值如下:

typedef NS_ENUM(NSInteger, WKNavigationType) {
// 鏈接已經(jīng)點(diǎn)擊
   WKNavigationTypeLinkActivated,
   // 表單提交
   WKNavigationTypeFormSubmitted,
   // 前進(jìn)民傻、后退
   WKNavigationTypeBackForward,
   // 重新載入
   WKNavigationTypeReload,
   // 表單重新提交
   WKNavigationTypeFormResubmitted,
   // 其它
   WKNavigationTypeOther = -1,
} NS_ENUM_AVAILABLE(10_10, 8_0);

WKUIDelegate

@protocol WKUIDelegate <NSObject>
@optional

// 創(chuàng)建新的webview
// 可以指定配置對象胰默、導(dǎo)航動(dòng)作對象、window特性
- (nullable WKWebView *)webView:(WKWebView *)webView createWebViewWithConfiguration:(WKWebViewConfiguration *)configuration forNavigationAction:(WKNavigationAction *)navigationAction windowFeatures:(WKWindowFeatures *)windowFeatures;

// webview關(guān)閉時(shí)回調(diào)
- (void)webViewDidClose:(WKWebView *)webView NS_AVAILABLE(10_11, 9_0);

// 調(diào)用JS的alert()方法
- (void)webView:(WKWebView *)webView runJavaScriptAlertPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(void))completionHandler;

// 調(diào)用JS的confirm()方法
- (void)webView:(WKWebView *)webView runJavaScriptConfirmPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(BOOL result))completionHandler;

// 調(diào)用JS的prompt()方法
- (void)webView:(WKWebView *)webView runJavaScriptTextInputPanelWithPrompt:(NSString *)prompt defaultText:(nullable NSString *)defaultText initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(NSString * __nullable result))completionHandler;

@end

WKBackForwardList

WKBackForwardList表示webview中可以前進(jìn)或者后退的頁面列表漓踢。其聲明如下：

NS_CLASS_AVAILABLE(10_10, 8_0)
@interface WKBackForwardList : NSObject
 
// 當(dāng)前正在顯示的item（頁面）
@property (nullable, nonatomic, readonly, strong) WKBackForwardListItem *currentItem;
 
// 后一頁牵署，如果沒有就是nil
@property (nullable, nonatomic, readonly, strong) WKBackForwardListItem *backItem;
 
// 前一頁，如果沒有就是nil
@property (nullable, nonatomic, readonly, strong) WKBackForwardListItem *forwardItem;
 
// 根據(jù)下標(biāo)獲取某一個(gè)頁面的item
- (nullable WKBackForwardListItem *)itemAtIndex:(NSInteger)index;
 
// 可以進(jìn)行g(shù)oback操作的頁面列表
@property (nonatomic, readonly, copy) NSArray<WKBackForwardListItem *> *backList;
 
// 可以進(jìn)行g(shù)oforward操作的頁面列表
@property (nonatomic, readonly, copy) NSArray<WKBackForwardListItem *> *forwardList;
 
@end

WKBackForwardListItem

頁面導(dǎo)航前進(jìn)喧半、后退列表項(xiàng)：

NS_CLASS_AVAILABLE(10_10, 8_0)
@interface WKBackForwardListItem : NSObject

// 該頁面的URL
@property (readonly, copy) NSURL *URL;

// 該頁面的title
@property (nullable, readonly, copy) NSString *title;

// 初始請求該item的請求的URL
@property (readonly, copy) NSURL *initialURL;

@end