(0085)iOS开发之OC与JS交互高级用法（JavaScriptCore）

本文主要是介绍(0085)iOS开发之OC与JS交互高级用法（JavaScriptCore），希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

前述：JavaScriptCore你不知道的OC与JS之间交互。OC与JS之间用model实现交互、通讯、传值！好玩！

几乎三年来一直断断续续接触OC与JS交互，每次觉得UIWebView OC与JS的交互已经很熟练了，但是每次研究它都会有新的收获。也越来越感觉JS和OC交互原来这么顺滑，越来越无感！完全可以像OC一样使用OC的对象，属性，方法！真心是太方便了！

##其实之前我也总结过OC与JS交互无非三种情况：WebViewJavascriptBridge、JavaScriptCore、拦截URL。##

有人问我？“我想给jsmodel中让h5返回一堆参数可以不？”
根据这个问题？我就动手实践了一下！这里使用的JavaScriptCore的JSExport 实现的！

实践代码：https://github.com/muyushifang07/jsCallOCModel

第一部分：

//
//  ELLiveJSModel.h
//  JavaScriptCoreDemo
//
//  Created by giifidev on 2018/8/21.
//  Copyright © 2018年 reborn. All rights reserved.
//#import <Foundation/Foundation.h>
#import <JavaScriptCore/JSExport.h>@class ELLiveJSModel;
@protocol MyPointExports <JSExport>@property (nonatomic,assign) double x;
@property (nonatomic,assign) double y;- (NSString *)description;
- (ELLiveJSModel *)makePointX:(double)x PointY:(double)y;@end@interface ELLiveJSModel : NSObject<MyPointExports>@property (nonatomic,assign) double x;
@property (nonatomic,assign) double y;- (NSString *)description;
- (ELLiveJSModel *)makePointX:(double)x PointY:(double)y;@end

//
//  ELLiveJSModel.m
//  JavaScriptCoreDemo
//
//  Created by giifidev on 2018/8/21.
//  Copyright © 2018年 reborn. All rights reserved.
//#import "ELLiveJSModel.h"@implementation ELLiveJSModel- (NSString *)description {// self.x = 7;// self.y = 9;// 这里可以看到前端赋的值20，前端直接可以操作OC 的model以及属性NSLog(@"打印model的X的值-----:%f",self.x);return @"description";
}- (ELLiveJSModel *)makePointX:(double)x PointY:(double)y {ELLiveJSModel *model = [[ELLiveJSModel alloc]init];model.x = x;model.y = y;NSLog(@"返回一个新的model.x:%f model.y:%f",model.x,model.y);return model;
}@end

第二部分：##

//
//  JSModelViewController.m
//  JavaScriptCoreDemo
//
//  Created by giifidev on 2018/8/21.
//  Copyright © 2018年 reborn. All rights reserved.
//#import "JSModelViewController.h"
#import "ELLiveJSModel.h"#define kScreenWidth                [UIScreen mainScreen].bounds.size.width
#define kScreenHeight               [UIScreen mainScreen].bounds.size.height@interface JSModelViewController ()<UIWebViewDelegate>
@property(nonatomic, strong) UIWebView *webView;
@property(nonatomic, strong) JSContext *context;
@end@implementation JSModelViewController
- (void)viewDidLoad
{[super viewDidLoad];// Do any additional setup after loading the view from its nib.self.title = @"indexModel";self.view.backgroundColor = [UIColor whiteColor];self.webView = [[UIWebView alloc] initWithFrame:CGRectMake(0, 0, kScreenWidth, kScreenHeight)];[self.view addSubview:self.webView];NSString *path = [[NSBundle mainBundle] pathForResource:@"indexModel" ofType:@"html"];NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL fileURLWithPath:path]];self.webView.delegate = self;[self.webView loadRequest:request];
}#pragma mark - UIWebViewDelegate- (void)webViewDidFinishLoad:(UIWebView *)webView
{// 获取html title设置导航栏 titleself.title = [webView stringByEvaluatingJavaScriptFromString:@"document.title"];self.context = [webView valueForKeyPath:@"documentView.webView.mainFrame.javaScriptContext"];// 捕捉异常回调self.context.exceptionHandler = ^(JSContext *context, JSValue *exceptionValue) {context.exception = exceptionValue;NSLog(@"异常信息: %@",exceptionValue);};// model 的方法JS与OC交互ELLiveJSModel *jsModel = [ELLiveJSModel new];self.context[@"testobject"] = jsModel;// 注意：jsModel 是在OC的对象名字，testobject 是在JS中的对象名字// 模拟JS调用方法NSString *jsCallOCModelFunction = @"testobject.description()";JSValue *valu = [self.context evaluateScript:jsCallOCModelFunction];NSLog(@"vali----:%@",[valu toString]);  // 返回值NSLog(@"尚未赋值X的log:%f",jsModel.x);// 模拟JS调用方法 给testobject.x赋值NSString *jsCallOCModelFunction1 = @"testobject.x=30";[self.context evaluateScript:jsCallOCModelFunction1];NSLog(@"jsCallOCFunction1----%f",jsModel.x);// JS双参数调用的例子NSString *jsCallOCModelFunction2 = @"testobject.makePointXPointY('20','50')";[self.context evaluateScript:jsCallOCModelFunction2];NSLog(@"jsCallOCFunction2----%f",jsModel.x);
}- (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error
{NSLog(@"error == %@",error);
}- (void)didReceiveMemoryWarning {[super didReceiveMemoryWarning];// Dispose of any resources that can be recreated.
}@end