版本記錄

前言

iOS8和OS X 10.10以后，蘋果推出了新框架WebKit赶舆，提供了替換UIWebView的組件WKWebView类少。各種UIWebView的問題沒有了，速度更快了羹唠，占用內(nèi)存少了。接下來幾篇我們就對WebKit框架進(jìn)行全面深度的解析娄昆，還是老規(guī)矩佩微，從簡單到復(fù)雜，從面到點萌焰。

WebKit框架結(jié)構(gòu)

先看一下該框架的基本信息哺眯。

下面我們就看一下WebKit框架。

大家可以這個框架內(nèi)容不是很多扒俯，比較重要的就是WKWebView以及其他幾個代理奶卓。

在窗口中顯示網(wǎng)頁內(nèi)容。 實現(xiàn)瀏覽器功能撼玄，如跟隨用戶激活的鏈接夺姑，管理后退列表以及管理最近訪問過的頁面的歷史記錄。

WebKit提供了一系列在窗口中顯示網(wǎng)頁內(nèi)容的類掌猛，并實現(xiàn)了瀏覽器功能盏浙，例如用戶點擊鏈接后，管理后退列表以及管理最近訪問的頁面歷史留潦。 WebKit極大地簡化了加載網(wǎng)頁的復(fù)雜過程只盹，也就是從HTTP服務(wù)器異步請求網(wǎng)頁內(nèi)容，其中響應(yīng)可以以隨機(jī)順序遞增或部分由網(wǎng)絡(luò)錯誤引起兔院。 WebKit還簡化了顯示可以包含各種MIME類型的內(nèi)容的過程殖卑，并且每個框架元素都有自己的一組滾動條。

重要：只能從您的應(yīng)用程序的主線程或主調(diào)度隊列中調(diào)用WebKit函數(shù)和方法坊萝。

WKWebView基本

一個WKWebView對象展示Web內(nèi)容的交互孵稽，比如app內(nèi)部瀏覽。你可以使用WKWebView類將Web內(nèi)容嵌入到你的app中十偶，為了實現(xiàn)這個目的菩鲜，首先需要創(chuàng)建一個WKWebView對象，把它設(shè)置為View惦积，并發(fā)送申請加載Web內(nèi)容接校。

在使用方法initWithFrame:configuration:創(chuàng)建WKWebView對象以后，你需要加載網(wǎng)絡(luò)Web內(nèi)容。使用方法loadHTMLString:baseURL:開始加載本地HTML文件蛛勉，或者使用方法loadRequest:開始加載Web內(nèi)容鹿寻；使用方法stopLoading停止加載；使用屬性loading去判斷Web視圖是否正在記載中诽凌；給對象設(shè)置delegate屬性毡熏，需要遵守協(xié)議WKUIDelegate以對web的內(nèi)容進(jìn)行跟蹤。

允許用戶根據(jù)Webpage歷史向前或者向后進(jìn)行查詢侣诵，使用 goBack和goForward方法作為事件按鈕痢法，當(dāng)用戶不能移動查詢的時候，使用canGoBack 和 canGoForward屬性讓按鈕disable杜顺。

默認(rèn)情況下财搁，web視圖上出現(xiàn)的電話號會自動的轉(zhuǎn)化為電話鏈接，當(dāng)電話鏈接被點擊時躬络，手機(jī)app就會彈出撥號頁面妇拯。如果要關(guān)掉這個默認(rèn)行為，需要設(shè)置dataDetectorTypes屬性為WKDataDetectorTypes洗鸵，它標(biāo)志著不包含WKDataDetectorTypePhoneNumber標(biāo)志位。

你可以使用方法setMagnification:centeredAtPoint:可編程的設(shè)置web內(nèi)容第一次在webView上面展示的尺寸仗嗦，這樣膘滨，用戶可以使用手勢改變尺寸。

WKWebView API

下面我們就看一下WKWebView的API稀拐。

#import <WebKit/WKFoundation.h>

#if WK_API_ENABLED

#if TARGET_OS_IPHONE
#import <UIKit/UIKit.h>
#else
#import <AppKit/AppKit.h>
#endif

NS_ASSUME_NONNULL_BEGIN

@class WKBackForwardList;
@class WKBackForwardListItem;
@class WKNavigation;
@class WKWebViewConfiguration;

@protocol WKNavigationDelegate;
@protocol WKUIDelegate;

/*!
 A WKWebView object displays interactive Web content.
 @helperclass @link WKWebViewConfiguration @/link
 Used to configure @link WKWebView @/link instances.
 */
#if TARGET_OS_IPHONE
WK_EXTERN API_AVAILABLE(macosx(10.10), ios(8.0))
@interface WKWebView : UIView
#else
WK_EXTERN API_AVAILABLE(macosx(10.10), ios(8.0))
@interface WKWebView : NSView
#endif

/*! @abstract A copy of the configuration with which the web view was
 initialized. */
@property (nonatomic, readonly, copy) WKWebViewConfiguration *configuration;

/*! @abstract The web view's navigation delegate. */
@property (nullable, nonatomic, weak) id <WKNavigationDelegate> navigationDelegate;

/*! @abstract The web view's user interface delegate. */
@property (nullable, nonatomic, weak) id <WKUIDelegate> UIDelegate;

/*! @abstract The web view's back-forward list. */
@property (nonatomic, readonly, strong) WKBackForwardList *backForwardList;

/*! @abstract Returns a web view initialized with a specified frame and
 configuration.
 @param frame The frame for the new web view.
 @param configuration The configuration for the new web view.
 @result An initialized web view, or nil if the object could not be
 initialized.
 @discussion This is a designated initializer. You can use
 @link -initWithFrame: @/link to initialize an instance with the default
 configuration. The initializer copies the specified configuration, so
 mutating the configuration after invoking the initializer has no effect
 on the web view.
 */
- (instancetype)initWithFrame:(CGRect)frame configuration:(WKWebViewConfiguration *)configuration NS_DESIGNATED_INITIALIZER;

- (nullable instancetype)initWithCoder:(NSCoder *)coder NS_DESIGNATED_INITIALIZER;

/*! @abstract Navigates to a requested URL.
 @param request The request specifying the URL to which to navigate.
 @result A new navigation for the given request.
 */
- (nullable WKNavigation *)loadRequest:(NSURLRequest *)request;

/*! @abstract Navigates to the requested file URL on the filesystem.
 @param URL The file URL to which to navigate.
 @param readAccessURL The URL to allow read access to.
 @discussion If readAccessURL references a single file, only that file may be loaded by WebKit.
 If readAccessURL references a directory, files inside that file may be loaded by WebKit.
 @result A new navigation for the given file URL.
 */
- (nullable WKNavigation *)loadFileURL:(NSURL *)URL allowingReadAccessToURL:(NSURL *)readAccessURL API_AVAILABLE(macosx(10.11), ios(9.0));

/*! @abstract Sets the webpage contents and base URL.
 @param string The string to use as the contents of the webpage.
 @param baseURL A URL that is used to resolve relative URLs within the document.
 @result A new navigation.
 */
- (nullable WKNavigation *)loadHTMLString:(NSString *)string baseURL:(nullable NSURL *)baseURL;

/*! @abstract Sets the webpage contents and base URL.
 @param data The data to use as the contents of the webpage.
 @param MIMEType The MIME type of the data.
 @param encodingName The data's character encoding name.
 @param baseURL A URL that is used to resolve relative URLs within the document.
 @result A new navigation.
 */
- (nullable WKNavigation *)loadData:(NSData *)data MIMEType:(NSString *)MIMEType characterEncodingName:(NSString *)characterEncodingName baseURL:(NSURL *)baseURL API_AVAILABLE(macosx(10.11), ios(9.0));

/*! @abstract Navigates to an item from the back-forward list and sets it
 as the current item.
 @param item The item to which to navigate. Must be one of the items in the
 web view's back-forward list.
 @result A new navigation to the requested item, or nil if it is already
 the current item or is not part of the web view's back-forward list.
 @seealso backForwardList
 */
- (nullable WKNavigation *)goToBackForwardListItem:(WKBackForwardListItem *)item;

/*! @abstract The page title.
 @discussion @link WKWebView @/link is key-value observing (KVO) compliant
 for this property.
 */
@property (nullable, nonatomic, readonly, copy) NSString *title;

/*! @abstract The active URL.
 @discussion This is the URL that should be reflected in the user
 interface.
 @link WKWebView @/link is key-value observing (KVO) compliant for this
 property.
 */
@property (nullable, nonatomic, readonly, copy) NSURL *URL;

/*! @abstract A Boolean value indicating whether the view is currently
 loading content.
 @discussion @link WKWebView @/link is key-value observing (KVO) compliant
 for this property.
 */
@property (nonatomic, readonly, getter=isLoading) BOOL loading;

/*! @abstract An estimate of what fraction of the current navigation has been completed.
 @discussion This value ranges from 0.0 to 1.0 based on the total number of
 bytes expected to be received, including the main document and all of its
 potential subresources. After a navigation completes, the value remains at 1.0
 until a new navigation starts, at which point it is reset to 0.0.
 @link WKWebView @/link is key-value observing (KVO) compliant for this
 property.
 */
@property (nonatomic, readonly) double estimatedProgress;

/*! @abstract A Boolean value indicating whether all resources on the page
 have been loaded over securely encrypted connections.
 @discussion @link WKWebView @/link is key-value observing (KVO) compliant
 for this property.
 */
@property (nonatomic, readonly) BOOL hasOnlySecureContent;

/*! @abstract A SecTrustRef for the currently committed navigation.
 @discussion @link WKWebView @/link is key-value observing (KVO) compliant 
 for this property.
 */
@property (nonatomic, readonly, nullable) SecTrustRef serverTrust API_AVAILABLE(macosx(10.12), ios(10.0));

/*! @abstract A Boolean value indicating whether there is a back item in
 the back-forward list that can be navigated to.
 @discussion @link WKWebView @/link is key-value observing (KVO) compliant
 for this property.
 @seealso backForwardList.
 */
@property (nonatomic, readonly) BOOL canGoBack;

/*! @abstract A Boolean value indicating whether there is a forward item in
 the back-forward list that can be navigated to.
 @discussion @link WKWebView @/link is key-value observing (KVO) compliant
 for this property.
 @seealso backForwardList.
 */
@property (nonatomic, readonly) BOOL canGoForward;

/*! @abstract Navigates to the back item in the back-forward list.
 @result A new navigation to the requested item, or nil if there is no back
 item in the back-forward list.
 */
- (nullable WKNavigation *)goBack;

/*! @abstract Navigates to the forward item in the back-forward list.
 @result A new navigation to the requested item, or nil if there is no
 forward item in the back-forward list.
 */
- (nullable WKNavigation *)goForward;

/*! @abstract Reloads the current page.
 @result A new navigation representing the reload.
 */
- (nullable WKNavigation *)reload;

/*! @abstract Reloads the current page, performing end-to-end revalidation
 using cache-validating conditionals if possible.
 @result A new navigation representing the reload.
 */
- (nullable WKNavigation *)reloadFromOrigin;

/*! @abstract Stops loading all resources on the current page.
 */
- (void)stopLoading;

/* @abstract Evaluates the given JavaScript string.
 @param javaScriptString The JavaScript string to evaluate.
 @param completionHandler A block to invoke when script evaluation completes or fails.
 @discussion The completionHandler is passed the result of the script evaluation or an error.
*/
- (void)evaluateJavaScript:(NSString *)javaScriptString completionHandler:(void (^ _Nullable)(_Nullable id, NSError * _Nullable error))completionHandler;

/*! @abstract A Boolean value indicating whether horizontal swipe gestures
 will trigger back-forward list navigations.
 @discussion The default value is NO.
 */
@property (nonatomic) BOOL allowsBackForwardNavigationGestures;

/*! @abstract The custom user agent string or nil if no custom user agent string has been set.
*/
@property (nullable, nonatomic, copy) NSString *customUserAgent API_AVAILABLE(macosx(10.11), ios(9.0));

/*! @abstract A Boolean value indicating whether link preview is allowed for any
 links inside this WKWebView.
 @discussion The default value is YES on Mac and iOS.
 */
@property (nonatomic) BOOL allowsLinkPreview API_AVAILABLE(macosx(10.11), ios(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
/* @abstract A Boolean value indicating whether magnify gestures will
 change the web view's magnification.
 @discussion It is possible to set the magnification property even if
 allowsMagnification is set to NO.
 The default value is NO.
 */
@property (nonatomic) BOOL allowsMagnification;

/* @abstract The factor by which the page content is currently scaled.
 @discussion The default value is 1.0.
 */
@property (nonatomic) CGFloat magnification;

/* @abstract Scales the page content by a specified factor and centers the
 result on a specified point.
 * @param magnification The factor by which to scale the content.
 * @param point The point (in view space) on which to center magnification.
 */
- (void)setMagnification:(CGFloat)magnification centeredAtPoint:(CGPoint)point;

#endif

@end

#if !TARGET_OS_IPHONE

@interface WKWebView (WKIBActions) <NSUserInterfaceValidations>

/*! @abstract Action method that navigates to the back item in the
 back-forward list.
 @param sender The object that sent this message.
 */
- (IBAction)goBack:(nullable id)sender;

/*! @abstract Action method that navigates to the forward item in the
 back-forward list.
 @param sender The object that sent this message.
 */
- (IBAction)goForward:(nullable id)sender;

/*! @abstract Action method that reloads the current page.
 @param sender The object that sent this message.
 */
- (IBAction)reload:(nullable id)sender;

/*! @abstract Action method that reloads the current page, performing
 end-to-end revalidation using cache-validating conditionals if possible.
 @param sender The object that sent this message.
 */
- (IBAction)reloadFromOrigin:(nullable id)sender;

/*! @abstract Action method that stops loading all resources on the current
 page.
 @param sender The object that sent this message.
 */
- (IBAction)stopLoading:(nullable id)sender;

@end

#endif

@interface WKWebView (WKDeprecated)

@property (nonatomic, readonly, copy) NSArray *certificateChain API_DEPRECATED_WITH_REPLACEMENT("serverTrust", macosx(10.11, 10.12), ios(9.0, 10.0));

@end

NS_ASSUME_NONNULL_END

#endif

從上面可以看到火邓，WKWebView有一個本類，還有兩個分類德撬，WKIBActions和WKDeprecated铲咨。

1. 初始化方法

由于他繼承的是UIView，所以可以有初始化方法initWithFrame:蜓洪，此外就是API中提供的初始化方法纤勒。

/*! @abstract Returns a web view initialized with a specified frame and
 configuration.
 @param frame The frame for the new web view.
 @param configuration The configuration for the new web view.
 @result An initialized web view, or nil if the object could not be
 initialized.
 @discussion This is a designated initializer. You can use
 @link -initWithFrame: @/link to initialize an instance with the default
 configuration. The initializer copies the specified configuration, so
 mutating the configuration after invoking the initializer has no effect
 on the web view.
 */

- (instancetype)initWithFrame:(CGRect)frame configuration:(WKWebViewConfiguration *)configuration NS_DESIGNATED_INITIALIZER;

2. 加載網(wǎng)頁

#import "ViewController.h"
#import <WebKit/WebKit.h>
#import <WebKit/WKWebView.h>

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    WKWebView *webView = [[WKWebView alloc] initWithFrame:self.view.bounds];
    [webView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@"https://www.baidu.com"]]];
    [self.view addSubview:webView];
}

@end

下面看一下示例圖。

3. 代理方法

WKNavigationDelegate

該方法用來追蹤加載過程（頁面開始加載隆檀、加載完成摇天、加載失敗）恐仑、決定是否執(zhí)行跳轉(zhuǎn)泉坐。

// 頁面開始加載時調(diào)用
- (void)webView:(WKWebView *)webView didStartProvisionalNavigation:(WKNavigation *)navigation;

// 當(dāng)內(nèi)容開始返回時調(diào)用
- (void)webView:(WKWebView *)webView didCommitNavigation:(WKNavigation *)navigation;

// 頁面加載完成之后調(diào)用
- (void)webView:(WKWebView *)webView didFinishNavigation:(WKNavigation *)navigation;

// 頁面加載失敗時調(diào)用
- (void)webView:(WKWebView *)webView didFailProvisionalNavigation:(WKNavigation *)navigation;

頁面跳轉(zhuǎn)的代理方法有三種，分為（收到跳轉(zhuǎn)與決定是否跳轉(zhuǎn)兩種）

// 接收到服務(wù)器跳轉(zhuǎn)請求之后調(diào)用
- (void)webView:(WKWebView *)webView didReceiveServerRedirectForProvisionalNavigation:(WKNavigation *)navigation;

// 在收到響應(yīng)后裳仆，決定是否跳轉(zhuǎn)
- (void)webView:(WKWebView *)webView decidePolicyForNavigationResponse:(WKNavigationResponse *)navigationResponse decisionHandler:(void (^)(WKNavigationResponsePolicy))decisionHandler;

// 在發(fā)送請求之前腕让，決定是否跳轉(zhuǎn)
- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler;

WKUIDelegate

@protocol WKUIDelegate <NSObject>

@optional

/*! @abstract Creates a new web view.
 @param webView The web view invoking the delegate method.
 @param configuration The configuration to use when creating the new web
 view.
 @param navigationAction The navigation action causing the new web view to
 be created.
 @param windowFeatures Window features requested by the webpage.
 @result A new web view or nil.
 @discussion The web view returned must be created with the specified configuration. WebKit will load the request in the returned web view.

 If you do not implement this method, the web view will cancel the navigation.
 */
- (nullable WKWebView *)webView:(WKWebView *)webView createWebViewWithConfiguration:(WKWebViewConfiguration *)configuration forNavigationAction:(WKNavigationAction *)navigationAction windowFeatures:(WKWindowFeatures *)windowFeatures;

/*! @abstract Notifies your app that the DOM window object's close() method completed successfully.
  @param webView The web view invoking the delegate method.
  @discussion Your app should remove the web view from the view hierarchy and update
  the UI as needed, such as by closing the containing browser tab or window.
  */
- (void)webViewDidClose:(WKWebView *)webView API_AVAILABLE(macosx(10.11), ios(9.0));

/*! @abstract Displays a JavaScript alert panel.
 @param webView The web view invoking the delegate method.
 @param message The message to display.
 @param frame Information about the frame whose JavaScript initiated this
 call.
 @param completionHandler The completion handler to call after the alert
 panel has been dismissed.
 @discussion For user security, your app should call attention to the fact
 that a specific website controls the content in this panel. A simple forumla
 for identifying the controlling website is frame.request.URL.host.
 The panel should have a single OK button.

 If you do not implement this method, the web view will behave as if the user selected the OK button.
 */
- (void)webView:(WKWebView *)webView runJavaScriptAlertPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(void))completionHandler;

/*! @abstract Displays a JavaScript confirm panel.
 @param webView The web view invoking the delegate method.
 @param message The message to display.
 @param frame Information about the frame whose JavaScript initiated this call.
 @param completionHandler The completion handler to call after the confirm
 panel has been dismissed. Pass YES if the user chose OK, NO if the user
 chose Cancel.
 @discussion For user security, your app should call attention to the fact
 that a specific website controls the content in this panel. A simple forumla
 for identifying the controlling website is frame.request.URL.host.
 The panel should have two buttons, such as OK and Cancel.

 If you do not implement this method, the web view will behave as if the user selected the Cancel button.
 */
- (void)webView:(WKWebView *)webView runJavaScriptConfirmPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(BOOL result))completionHandler;

/*! @abstract Displays a JavaScript text input panel.
 @param webView The web view invoking the delegate method.
 @param message The message to display.
 @param defaultText The initial text to display in the text entry field.
 @param frame Information about the frame whose JavaScript initiated this call.
 @param completionHandler The completion handler to call after the text
 input panel has been dismissed. Pass the entered text if the user chose
 OK, otherwise nil.
 @discussion For user security, your app should call attention to the fact
 that a specific website controls the content in this panel. A simple forumla
 for identifying the controlling website is frame.request.URL.host.
 The panel should have two buttons, such as OK and Cancel, and a field in
 which to enter text.

 If you do not implement this method, the web view will behave as if the user selected the Cancel button.
 */
- (void)webView:(WKWebView *)webView runJavaScriptTextInputPanelWithPrompt:(NSString *)prompt defaultText:(nullable NSString *)defaultText initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(NSString * _Nullable result))completionHandler;

#if TARGET_OS_IPHONE

/*! @abstract Allows your app to determine whether or not the given element should show a preview.
 @param webView The web view invoking the delegate method.
 @param elementInfo The elementInfo for the element the user has started touching.
 @discussion To disable previews entirely for the given element, return NO. Returning NO will prevent 
 webView:previewingViewControllerForElement:defaultActions: and webView:commitPreviewingViewController:
 from being invoked.
 
 This method will only be invoked for elements that have default preview in WebKit, which is
 limited to links. In the future, it could be invoked for additional elements.
 */
- (BOOL)webView:(WKWebView *)webView shouldPreviewElement:(WKPreviewElementInfo *)elementInfo API_AVAILABLE(ios(10.0));

/*! @abstract Allows your app to provide a custom view controller to show when the given element is peeked.
 @param webView The web view invoking the delegate method.
 @param elementInfo The elementInfo for the element the user is peeking.
 @param defaultActions An array of the actions that WebKit would use as previewActionItems for this element by 
 default. These actions would be used if allowsLinkPreview is YES but these delegate methods have not been 
 implemented, or if this delegate method returns nil.
 @discussion Returning a view controller will result in that view controller being displayed as a peek preview.
 To use the defaultActions, your app is responsible for returning whichever of those actions it wants in your 
 view controller's implementation of -previewActionItems.
 
 Returning nil will result in WebKit's default preview behavior. webView:commitPreviewingViewController: will only be invoked
 if a non-nil view controller was returned.
 */
- (nullable UIViewController *)webView:(WKWebView *)webView previewingViewControllerForElement:(WKPreviewElementInfo *)elementInfo defaultActions:(NSArray<id <WKPreviewActionItem>> *)previewActions API_AVAILABLE(ios(10.0));

/*! @abstract Allows your app to pop to the view controller it created.
 @param webView The web view invoking the delegate method.
 @param previewingViewController The view controller that is being popped.
 */
- (void)webView:(WKWebView *)webView commitPreviewingViewController:(UIViewController *)previewingViewController API_AVAILABLE(ios(10.0));

#endif // TARGET_OS_IPHONE

#if !TARGET_OS_IPHONE

/*! @abstract Displays a file upload panel.
 @param webView The web view invoking the delegate method.
 @param parameters Parameters describing the file upload control.
 @param frame Information about the frame whose file upload control initiated this call.
 @param completionHandler The completion handler to call after open panel has been dismissed. Pass the selected URLs if the user chose OK, otherwise nil.

 If you do not implement this method, the web view will behave as if the user selected the Cancel button.
 */
- (void)webView:(WKWebView *)webView runOpenPanelWithParameters:(WKOpenPanelParameters *)parameters initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(NSArray<NSURL *> * _Nullable URLs))completionHandler API_AVAILABLE(macosx(10.12));

#endif

@end

4. 加載JS

// 圖片縮放的js代碼
NSString *js = @"var count = document.images.length;
for (var i = 0; i < count; i++) 
{var image = document.images[i];image.style.width=320;};
window.alert('找到' + count + '張圖');"; 

// 根據(jù)JS字符串初始化WKUserScript對象 WKUserScript *script = [[WKUserScript alloc] initWithSource:js injectionTime:WKUserScriptInjectionTimeAtDocumentEnd forMainFrameOnly:YES]; 

// 根據(jù)生成的WKUserScript對象，初始化WKWebViewConfiguration WKWebViewConfiguration *config = [[WKWebViewConfiguration alloc] init]; 
[config.userContentController addUserScript:script]; 
_webView = [[WKWebView alloc] initWithFrame:self.view.bounds configuration:config]; 
[_webView loadHTMLString:@"<head></head>![](http://upload-images.jianshu.io/upload_images/3691932-35e3997ed3c00f05.jpg?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)"baseURL:nil];
[self.view addSubview:_webView];

WKWenView新特性及優(yōu)點

• 在性能歧斟、穩(wěn)定性纯丸、功能方面有很大提升（最直觀的體現(xiàn)就是加載網(wǎng)頁是占用的內(nèi)存偏形，模擬器加載百度與開源中國網(wǎng)站時，WKWebView占用23M液南，而UIWebView占用85M）壳猜；
• 允許JavaScript的Nitro庫加載并使用（UIWebView中限制）；
• 支持了更多的HTML5特性滑凉；
• 高達(dá)60fps的滾動刷新率以及內(nèi)置手勢统扳；
• 將UIWebViewDelegate與UIWebView重構(gòu)成了14類與3個協(xié)議。

后記

未完畅姊，待續(xù)~~~