本篇文章依然是使用WKWebview来操作交互，继续认识一下WKWebview,上面文章介绍了WKWebview一些新特性，这里补充一下与之交互用到的三大代理，html文件中以及文章中会用到
WKNavigationDelegate，与页面导航加载相关
WKUIDelegate，与JS交互时的ui展示相关，比较JS的alert、confirm、prompt
WKScriptMessageHandler，与js交互相关，通常是ios端注入名称，js端通过window.webkit.messageHandlers.{NAME}.postMessage()来发消息到ios端
1.使用Html文件
html文件.png
Share == Message name
postMessage == Message body
2.创建WKWebViewConfiguration，并且配置各个API对应的MessageHandler。
基础配置，导入框架，实现协议
#import <WebKit/WebKit.h>
@interface WKWebViewController ()<WKUIDelegate,WKScriptMessageHandler>
代码实现
- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
// addScriptMessageHandler 很容易导致循环引用
// 控制器 强引用了WKWebView,WKWebView copy(强引用了）configuration， configuration copy （强引用了）userContentController
// userContentController 强引用了 self （控制器）
[self.webView.configuration.userContentController addScriptMessageHandler:self name:@"ScanAction"];
[self.webView.configuration.userContentController addScriptMessageHandler:self name:@"Location"];
[self.webView.configuration.userContentController addScriptMessageHandler:self name:@"Share"];
[self.webView.configuration.userContentController addScriptMessageHandler:self name:@"Color"];
[self.webView.configuration.userContentController addScriptMessageHandler:self name:@"Pay"];
[self.webView.configuration.userContentController addScriptMessageHandler:self name:@"Shake"];
[self.webView.configuration.userContentController addScriptMessageHandler:self name:@"GoBack"];
[self.webView.configuration.userContentController addScriptMessageHandler:self name:@"PlaySound"];
}
// 需要注意的是addScriptMessageHandler很容易引起循环引用，导致控制器无法被释放，所以需要加入以下这段：
- (void)viewWillDisappear:(BOOL)animated
{
[super viewWillDisappear:animated];
// 因此这里要记得移除handlers
[self.webView.configuration.userContentController removeScriptMessageHandlerForName:@"ScanAction"];
[self.webView.configuration.userContentController removeScriptMessageHandlerForName:@"Location"];
[self.webView.configuration.userContentController removeScriptMessageHandlerForName:@"Share"];
[self.webView.configuration.userContentController removeScriptMessageHandlerForName:@"Color"];
[self.webView.configuration.userContentController removeScriptMessageHandlerForName:@"Pay"];
[self.webView.configuration.userContentController removeScriptMessageHandlerForName:@"Shake"];
[self.webView.configuration.userContentController removeScriptMessageHandlerForName:@"GoBack"];
[self.webView.configuration.userContentController removeScriptMessageHandlerForName:@"PlaySound"];
}
3.创建WKWebView。
- (void)initWKWebView
{
WKWebViewConfiguration *configuration = [[WKWebViewConfiguration alloc] init];
WKPreferences *preferences = [WKPreferences new];
preferences.javaScriptCanOpenWindowsAutomatically = YES;
preferences.minimumFontSize = 40.0;
configuration.preferences = preferences;
self.webView = [[WKWebView alloc] initWithFrame:self.view.frame configuration:configuration];
NSString *urlStr = [[NSBundle mainBundle] pathForResource:@"index.html" ofType:nil];
NSURL *fileURL = [NSURL fileURLWithPath:urlStr];
[self.webView loadFileURL:fileURL allowingReadAccessToURL:fileURL];
self.webView.UIDelegate = self;
[self.view addSubview:self.webView];
}
4.实现协议方法。
- (void)userContentController:(WKUserContentController *)userContentController didReceiveScriptMessage:(WKScriptMessage *)message
{
//Share == Message name
//postMessage == Message body
// message.body -- Allowed types are NSNumber, NSString, NSDate, NSArray,NSDictionary, and NSNull.
NSLog(@"body:%@",message.body);
if ([message.name isEqualToString:@"ScanAction"]) {
NSLog(@"扫一扫");
} else if ([message.name isEqualToString:@"Location"]) {
[self getLocation];
} else if ([message.name isEqualToString:@"Share"]) {
[self shareWithParams:message.body];
} else if ([message.name isEqualToString:@"Color"]) {
[self changeBGColor:message.body];
} else if ([message.name isEqualToString:@"Pay"]) {
[self payWithParams:message.body];
} else if ([message.name isEqualToString:@"Shake"]) {
[self shakeAction];
} else if ([message.name isEqualToString:@"GoBack"]) {
[self goBack];
} else if ([message.name isEqualToString:@"PlaySound"]) {
[self playSound:message.body];
}
}
关于WKScriptMessage的定义
@interface WKScriptMessage : NSObject
/*! @abstract The body of the message.
@discussion Allowed types are NSNumber, NSString, NSDate, NSArray,
NSDictionary, and NSNull.
*/
@property (nonatomic, readonly, copy) id body;
/*! @abstract The web view sending the message. */
@property (nullable, nonatomic, readonly, weak) WKWebView *webView;
/*! @abstract The frame sending the message. */
@property (nonatomic, readonly, copy) WKFrameInfo *frameInfo;
/*! @abstract The name of the message handler to which the message is sent.
*/
@property (nonatomic, readonly, copy) NSString *name;
WKScriptMessage有两个关键属性name 和 body。
因为我们给每一个OC 方法取了一个name，那么我们就可以根据name 来区分执行不同的方法。body 中存着JS 要给OC 传的参数。
- (void)payWithParams:(NSDictionary *)tempDic
{
if (![tempDic isKindOfClass:[NSDictionary class]]) {
return;
}
NSString *orderNo = [tempDic objectForKey:@"order_no"];
long long amount = [[tempDic objectForKey:@"amount"] longLongValue];
NSString *subject = [tempDic objectForKey:@"subject"];
NSString *channel = [tempDic objectForKey:@"channel"];
NSLog(@"%@---%lld---%@---%@",orderNo,amount,subject,channel);
// 支付操作
// 将支付结果返回给js
NSString *jsStr = [NSString stringWithFormat:@"payResult('%@')",@"支付成功"];
[self.webView evaluateJavaScript:jsStr completionHandler:^(id _Nullable result, NSError * _Nullable error) {
NSLog(@"%@----%@",result, error);
}];
}
5.处理HTML中JS调用。
// 见文章开头图片文件
function scanClick() {
window.webkit.messageHandlers.ScanAction.postMessage(null);
}
function shareClick() {
window.webkit.messageHandlers.Share.postMessage({title:'测试分享的标题',content:'测试分享的内容',url:'http://m.rblcmall.com/share/openShare.htm?share_uuid=shdfxdfdsfsdfs&share_url=http://m.rblcmall.com/store_index_32787.htm&imagePath=http://c.hiphotos.baidu.com/image/pic/item/f3d3572c11dfa9ec78e256df60d0f703908fc12e.jpg'});
}
6.OC调用js
// 将分享结果返回给js
NSString *jsStr = [NSString stringWithFormat:@"shareResult('%@','%@','%@')",title,content,url];
[self.webView evaluateJavaScript:jsStr completionHandler:^(id _Nullable result, NSError * _Nullable error) {
NSLog(@"%@----%@",result, error);
}];
注意方法调用，传递参数根据在js中的参数格式。
以上交互操作，还是鉴于WKWebview操作的基础上，使用MessageHandler来实现。
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