IOS進(jìn)階之WKWebView

基本使用方法
WKWebView有兩個(gè)delegate,WKUIDelegate 和 WKNavigationDelegate。WKNavigationDelegate主要處理一些跳轉(zhuǎn)、加載處理操作，WKUIDelegate主要處理JS腳本，確認(rèn)框，警告框等。因此WKNavigationDelegate更加常用。
比較常用的方法：

#pragma mark - lifeCircle
- (void)viewDidLoad { 
[super viewDidLoad]; 
webView = [[WKWebView alloc]init]; 
[self.view addSubview:webView]; 
[webView mas_makeConstraints:^(MASConstraintMaker *make) { make.left.equalTo(self.view); make.right.equalTo(self.view); make.top.equalTo(self.view); make.bottom.equalTo(self.view); 
}]; 
webView.UIDelegate = self; 
webView.navigationDelegate = self; 
[webView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@"http://www.baidu.com"]]];
}
#pragma mark- WKNavigationDelegate
// 頁(yè)面開(kāi)始加載時(shí)調(diào)用
- (void)webView:(WKWebView *)webView didStartProvisionalNavigation:(WKNavigation *)navigation{
}
// 當(dāng)內(nèi)容開(kāi)始返回時(shí)調(diào)用
- (void)webView:(WKWebView *)webView didCommitNavigation:(WKNavigation *)navigation{
}
// 頁(yè)面加載完成之后調(diào)用
- (void)webView:(WKWebView *)webView didFinishNavigation:(WKNavigation *)navigation{
}
// 頁(yè)面加載失敗時(shí)調(diào)用
- (void)webView:(WKWebView *)webView didFailProvisionalNavigation:(WKNavigation *)navigation{
}
// 接收到服務(wù)器跳轉(zhuǎn)請(qǐng)求之后調(diào)用
- (void)webView:(WKWebView *)webView didReceiveServerRedirectForProvisionalNavigation:(WKNavigation *)navigation{
}
// 在收到響應(yīng)后，決定是否跳轉(zhuǎn)
- (void)webView:(WKWebView *)webView decidePolicyForNavigationResponse:(WKNavigationResponse *)navigationResponse decisionHandler:(void (^)(WKNavigationResponsePolicy))decisionHandler{
 NSLog(@"%@",navigationResponse.response.URL.absoluteString);
 //允許跳轉(zhuǎn) 
decisionHandler(WKNavigationResponsePolicyAllow); 
//不允許跳轉(zhuǎn) 
//decisionHandler(WKNavigationResponsePolicyCancel);
}
// 在發(fā)送請(qǐng)求之前，決定是否跳轉(zhuǎn)
- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler{ NSLog(@"%@",navigationAction.request.URL.absoluteString); 
//允許跳轉(zhuǎn) 
decisionHandler(WKNavigationActionPolicyAllow); 
//不允許跳轉(zhuǎn) //decisionHandler(WKNavigationActionPolicyCancel);
}
#pragma mark - WKUIDelegate
// 創(chuàng)建一個(gè)新的WebView
- (WKWebView *)webView:(WKWebView *)webView createWebViewWithConfiguration:(WKWebViewConfiguration *)configuration forNavigationAction:(WKNavigationAction *)navigationAction windowFeatures:(WKWindowFeatures *)windowFeatures{ 
  return [[WKWebView alloc]init];
}
// 輸入框
- (void)webView:(WKWebView *)webView runJavaScriptTextInputPanelWithPrompt:(NSString *)prompt defaultText:(nullable NSString *)defaultText initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(NSString * __nullable result))completionHandler{ 
  completionHandler(@"http");
}
// 確認(rèn)框
- (void)webView:(WKWebView *)webView runJavaScriptConfirmPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(BOOL result))completionHandler{ 
  completionHandler(YES);
}
// 警告框
- (void)webView:(WKWebView *)webView runJavaScriptAlertPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(void))completionHandler{ 
NSLog(@"%@",message); completionHandler();
}

OC與JS交互
WKWebview提供了API實(shí)現(xiàn)js交互 不需要借助JavaScriptCore或者webJavaScriptBridge。使用WKUserContentController實(shí)現(xiàn)js native交互。簡(jiǎn)單的說(shuō)就是先注冊(cè)約定好的方法，然后再調(diào)用。

JS調(diào)用OC方法
oc代碼(有誤，內(nèi)存不釋放):

@interface ViewController ()<WKUIDelegate,WKNavigationDelegate,WKScriptMessageHandler>
{ 
WKWebView * webView;
 WKUserContentController* userContentController;
}
@end
@implementation ViewController
#pragma mark - lifeCircle
- (void)viewDidLoad {
 [super viewDidLoad]; 
//配置環(huán)境 
WKWebViewConfiguration * configuration = [[WKWebViewConfiguration alloc]init];
userContentController =[[WKUserContentController alloc]init]; 
configuration.userContentController = userContentController;
webView = [[WKWebView alloc]initWithFrame:CGRectMake(0, 0, 100, 100) configuration:configuration]; 
//注冊(cè)方法 
[userContentController addScriptMessageHandler:self name:@"sayhello"];
//注冊(cè)一個(gè)name為sayhello的js方法
 [self.view addSubview:webView]; 
[webView mas_makeConstraints:^(MASConstraintMaker *make) { make.left.equalTo(self.view); make.right.equalTo(self.view); make.top.equalTo(self.view); make.bottom.equalTo(self.view); 
}]; 
webView.UIDelegate = self; 
webView.navigationDelegate = self; 
[webView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@"http://www.test.com"]]];
}
- (void)dealloc{ 
//這里需要注意，前面增加過(guò)的方法一定要remove掉。 [userContentController removeScriptMessageHandlerForName:@"sayhello"];}
#pragma mark - WKScriptMessageHandler
- (void)userContentController:(WKUserContentController *)userContentController didReceiveScriptMessage:(WKScriptMessage *)message{ 
NSLog(@"name:%@\\\\n body:%@\\\\n frameInfo:%@\\\\n",message.name,message.body,message.frameInfo);
}
@end

上面的OC代碼如果認(rèn)證測(cè)試一下就會(huì)發(fā)現(xiàn)dealloc并不會(huì)執(zhí)行，這樣肯定是不行的，會(huì)造成內(nèi)存泄漏。原因是[userContentController addScriptMessageHandler:self name:@"sayhello"];這句代碼造成無(wú)法釋放內(nèi)存。（ps:試了下用weak指針還是不能釋放，不知道是什么原因。）因此還需要進(jìn)一步改進(jìn)，正確的寫法是用一個(gè)新的controller來(lái)處理,新的controller再繞用delegate繞回來(lái)。

oc代碼(正確寫法):

@interface ViewController ()<WKUIDelegate,WKNavigationDelegate,WKScriptMessageHandler>
{ 
WKWebView * webView; 
WKUserContentController* userContentController;
}
@end
@implementation ViewController
#pragma mark - lifeCircle
- (void)viewDidLoad { 
[super viewDidLoad]; 
//配置環(huán)境 
WKWebViewConfiguration * configuration = [[WKWebViewConfiguration alloc]init]; 
userContentController =[[WKUserContentController alloc]init]; configuration.userContentController = userContentController; 
webView = [[WKWebView alloc]initWithFrame:CGRectMake(0, 0, 100, 100) configuration:configuration]; 
//注冊(cè)方法 WKDelegateController * delegateController = [[WKDelegateController alloc]init]; 
delegateController.delegate = self; 
[userContentController addScriptMessageHandler:delegateController name:@"sayhello"]; 
[self.view addSubview:webView]; 
[webView mas_makeConstraints:^(MASConstraintMaker *make) { make.left.equalTo(self.view); make.right.equalTo(self.view); make.top.equalTo(self.view); make.bottom.equalTo(self.view); 
}]; 
webView.UIDelegate = self; 
webView.navigationDelegate = self;
 [webView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@"http://www.test.com"]]];
}
- (void)dealloc{ 
//這里需要注意，前面增加過(guò)的方法一定要remove掉。 [userContentController removeScriptMessageHandlerForName:@"sayhello"];
}
#pragma mark - WKScriptMessageHandler
- (void)userContentController:(WKUserContentController *)userContentController didReceiveScriptMessage:(WKScriptMessage *)message{ 
NSLog(@"name:%@\\\\n body:%@\\\\n frameInfo:%@\\\\n",message.name,message.body,message.frameInfo);
}
@end

WKDelegateController代碼：

#import <UIKit/UIKit.h>
#import <WebKit/WebKit.h>
@protocol WKDelegate <NSObject>
- (void)userContentController:(WKUserContentController *)userContentController didReceiveScriptMessage:(WKScriptMessage *)message;
@end
@interface WKDelegateController : UIViewController <WKScriptMessageHandler>
@property (weak , nonatomic) id<WKDelegate> delegate;
@end

.m代碼：

#import "WKDelegateController.h"
@interface WKDelegateController ()
@end
@implementation WKDelegateController
- (void)viewDidLoad {
 [super viewDidLoad];
}
- (void)userContentController:(WKUserContentController *)userContentController didReceiveScriptMessage:(WKScriptMessage *)message{ 
if ([self.delegate respondsToSelector:@selector(userContentController:didReceiveScriptMessage:)]) { 
  [self.delegate userContentController:userContentController didReceiveScriptMessage:message];
 }
}
@end

h5代碼:

<html><head> <script>function say(){//前端需要用 window.webkit.messageHandlers.注冊(cè)的方法名.postMessage({body:傳輸?shù)臄?shù)據(jù)} 來(lái)給native發(fā)送消息 window.webkit.messageHandlers.sayhello.postMessage({body: 'hello world!'});}</script></head> <body> <h1>hello world</h1> <button onclick="say()">say hello</button> </body></html>

打印出的log：

 name:sayhello
 body:{ 
  body = "hello world!";
} 
frameInfo:<WKFrameInfo: 0x7f872060ce20; isMainFrame = YES;
 request = <NSMutableURLRequest: 0x618000010a30> { URL: http://www.test.com/ }>

WebViewJavascriptBridge
一般來(lái)說(shuō)，一個(gè)好的UI總有一個(gè)大神會(huì)開(kāi)發(fā)出一個(gè)好的第三方封裝框架。WebViewJavascriptBridge的作者也做了一套支持WKWebView與JS交互的第三方框架:WKWebViewJavascriptBridge。
cocoaPods: pod 'WebViewJavascriptBridge', '~> 5.0.5'

github地址：https://github.com/marcuswestin/WebViewJavascriptBridge

主要方法如下：

//初始化方法
+ (instancetype)bridgeForWebView:(WKWebView*)webView;
+ (void)enableLogging;
//注冊(cè)函數(shù)名
- (void)registerHandler:(NSString*)handlerName handler:(WVJBHandler)handler;
//調(diào)用函數(shù)名
- (void)callHandler:(NSString*)handlerName;
- (void)callHandler:(NSString*)handlerName data:(id)data;
- (void)callHandler:(NSString*)handlerName data:(id)data responseCallback:(WVJBResponseCallback)responseCallback;
//重置
- (void)reset;
//設(shè)置WKNavigationDelegate
- (void)setWebViewDelegate:(id<WKNavigationDelegate>)webViewDelegate;

基本的實(shí)現(xiàn)方法和上面寫的差不多，就是封裝了一下，有興趣的童鞋可以自己pod下來(lái)使用。
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