IOS中UIWebView、WKWebView之JS交互

做客户端开发，肯定避免不了JS交互，于是自己对苹果接口做了个简易封装：

JSExport-->UIWebView+Interaction、WKScriptMessageHandler -->WKWebView+Interaction以备以后使用。

代码非常简洁，见这里：https://github.com/V5zhou/JSInteraction.git

旧方式

旧的交互方式有通过UIWebViewDelegate实现的：JS与客户端定义好跳转页面参数，在将要跳转时捕获关键字，然后处理业务。

iOS端：

- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType {
  NSString *urlString = [[request URL] absoluteString];
  if ([urlString isEqualToString:@"objc://loading"]) {
    if (_gotoRootViewController) {
      _gotoRootViewController();
    }
  }
  return YES;
}

JS端：

<!DOCTYPE html>
<html>
  <title>test</title>
  <meta charset="utf-8">
    <body>
      <a href="javascript:document.location = 'objc://loading'" rel="external nofollow" class="btn">这是交互按钮</a>
    </body>
</html>

UIWebView+JSExport方式

导入JavaScriptCore.framework，并导入我的扩展类#import "UIWebView+Interaction.h"。

使用方式

OC调JS：

[_webView InterActionToJs:@"alertMobile('15625298071')"];

JS调OC:

- (void)webViewDidFinishLoad:(UIWebView *)webView {
  [self.webView InterActionToOc:^(InterActionOcType functionType, NSDictionary *param) {
    switch (functionType) {
      case InterActionOcType_alert:
      {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:param[@"title"] message:param[@"content"] delegate:nil cancelButtonTitle:nil otherButtonTitles:@"确定", nil];
        [alert show];
      }
        break;
      case InterActionOcType_present:
      {
        self.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
        Class Cls = NSClassFromString(param[@"toController"]);
        BOOL isAnimate = [param[@"animate"] boolValue];
        UIViewController *ctl = [[Cls alloc] init];
        [self presentViewController:ctl animated:isAnimate completion:nil];
      }
        break;

      default:
        break;
    }
  }];
}

添加动作

//自定义添加功能类型
typedef NS_ENUM(NSUInteger, InterActionOcType) {
  InterActionOcType_alert = 0,
  InterActionOcType_present,
  InterActionOcType_xxxxxxx,   //有啥需求就和这里添加
};

并且对应的html中添加JS,参数封装为字典形式。例：

function myPresent(ctl) {
      var param = new Array();
      param["animate"] = 1;
      param["toController"] = "SecondViewController";
      WebViewInteraction.callBack(1, param);
    }

其中callBack是通过这个JSExport实现的

@protocol WebViewJSExport <JSExport>
JSExportAs
(callBack /** callBack 作为js方法的别名 */,
 - (void)awakeOC:(InterActionOcType)type param:(NSDictionary *)param
 );
@end

WKWebView+WKScriptMessageHandler方式

导入WebKit.framework，并导入我的扩展类#import "WKWebView+Interaction.h"。

使用方式

OC调JS：

[self.wkWebView InterActionToJs:@"JSReloadTitle('你点了刷新JS按钮，我没猜错！')"];

JS调OC:

//注册交互类型
  [self.wkWebView registerScriptTypes:@{@"OCDismiss" : @(WKInterActionOcType_dismiss),
                     @"OCShowAlert" : @(WKInterActionOcType_alert)}];

  [self.wkWebView InterActionToOc:^(WKInterActionOcType functionType, NSDictionary *param) {
    switch (functionType) {
      case WKInterActionOcType_dismiss:
      {
        BOOL isAnimate = [param[@"animate"] boolValue];
        [self dismissViewControllerAnimated:isAnimate completion:nil];
      }
        break;
      case WKInterActionOcType_alert:
      {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"JS去做平方" message:nil delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"确定", nil];
        alert.alertViewStyle = UIAlertViewStylePlainTextInput;
        [alert show];
      }
        break;
      default:
        break;
    }
  }];

添加动作

//自定义添加功能类型
typedef NS_ENUM(NSUInteger, WKInterActionOcType) {
  WKInterActionOcType_alert = 0,
  WKInterActionOcType_dismiss,
  WKInterActionOcType_xxxxxxx,   //有啥需求就和这里添加
};

并且对应的html中添加JS,参数封装为字典形式。例：

//js调oc
function myDismiss() {
  window.webkit.messageHandlers.OCDismiss.postMessage({"animate" : 1});  //这里的OCDismiss对应注册类型
}

其中callBack是通过WKScriptMessageHandler实现的

- (void)userContentController:(WKUserContentController *)userContentController didReceiveScriptMessage:(WKScriptMessage *)message {
  dispatch_async(dispatch_get_main_queue(), ^{
    NSString *name = message.name;
    NSDictionary *value = message.body;
    WKInterActionOcType type = [self.typeDict[name] integerValue];
    if (self.block) {
      self.block(type, value);
    }
  });
}

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