iOS js与WKWebView交互
2018-01-25 本文已影响152人
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1.浏览web页面,点击某个方法,并传值给oc原生,原生界面做出响应.
使用场景: 浏览web页面商品,点击查看详情,进入原生界面浏览商品详情.
#import <JavaScriptCore/JavaScriptCore.h>
#import <WebKit/WebKit.h>
@interface ViewController ()<WKNavigationDelegate,UIScrollViewDelegate,WKUIDelegate,WKScriptMessageHandler>
@property (nonatomic, strong) WKWebView *webView;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
self.view .backgroundColor =[UIColor whiteColor];
WKWebViewConfiguration *config = [[WKWebViewConfiguration alloc] init];
config.preferences = [[WKPreferences alloc] init];
config.preferences.minimumFontSize = 10;
config.preferences.javaScriptEnabled = YES;
config.preferences.javaScriptCanOpenWindowsAutomatically = NO;
config.userContentController = [[WKUserContentController alloc] init];
config.processPool = [[WKProcessPool alloc] init];
self.webView = [[WKWebView alloc] initWithFrame:self.view.bounds configuration:config];
//记得实现对应协议,不然方法不会实现.
self.webView.UIDelegate = self;
self.webView.navigationDelegate =self;
[self.view addSubview:self.webView];
[self.webView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@"http://192.168.1.188/index1.html"]]];
// **************** 此处划重点 **************** //
//添加注入js方法, oc与js端对应实现
[config.userContentController addScriptMessageHandler:self name:@"collectSendKey"];
[config.userContentController addScriptMessageHandler:self name:@"collectIsLogin"];
//js端代码实现实例(此处为js端实现代码给大家粘出来示范的!!!):
//window.webkit.messageHandlers.collectSendKey.postMessage({body: 'goodsId=1212'});
}
#pragma mark - WKScriptMessageHandler
//实现js注入方法的协议方法
- (void)userContentController:(WKUserContentController *)userContentController
didReceiveScriptMessage:(WKScriptMessage *)message {
//找到对应js端的方法名,获取messge.body
if ([message.name isEqualToString:@"collectSendKey"]) {
NSLog(@"%@", message.body);
}
}
2.浏览web页面,传递值给js界面,js界面通过值判断处理逻辑.
使用场景: 浏览web页面商品,加入购物车,js通过oc原生传递过去的userId是否为空,来判断当前app是否登录,未登录,跳转原生界面登录,已登录,则直接加入购物车
#pragma mark --------- WKNavigationDelegate --------------
// 加载成功,传递值给js
- (void)webView:(WKWebView *)webView didFinishNavigation:(WKNavigation *)navigation
{
//获取userId
//传递userId给 js端
NSString * userId = DEF_GET_OBJECT(UserID);
NSString * jsUserId;
if (!userId) {
jsUserId =@"";
}else{
jsUserId =userId;
}
//之所以给userId重新赋值,貌似是如果userId为空null 那么传给js端,js说无法判断,只好说,如果userId为null,重新定义为空字符串.如果大家有好的建议,可以在下方留言.
//同时,这个地方需要注意的是,js端并不能查看我们给他传递的是什么值,也无法打印,貌似是语言问题? 还是js骗我文化低,反正,咱们把值传给他,根据双方商量好的逻辑,给出判断,如果正常,那就ok了.
NSString * jsStr =[NSString stringWithFormat:@"sendKey('%@')",jsUserId];
[self.webView evaluateJavaScript:jsStr completionHandler:^(id _Nullable result, NSError * _Nullable error) {
//此处可以打印error.
}];
//js端获取传递值代码实现实例(此处为js端实现代码给大家粘出来示范的!!!):
//function sendKey(user_id){
$("#input").val(user_id);
}
}
//依然是这个协议方法,获取注入方法名对象,获取js返回的状态值.
#pragma mark - WKScriptMessageHandler
- (void)userContentController:(WKUserContentController *)userContentController
didReceiveScriptMessage:(WKScriptMessage *)message {
//js端判断如果userId为空,则返回字符串@"toLogin" ,或者返回其它值. js端代码实现实例(此处为js端实现代码给大家粘出来示范的!!!):
function collectIsLogin(goods_id){
if (/(iPhone|iPad|iPod|iOS)/i.test(navigator.userAgent)) {
try {
if( $("#input").val()){
window.webkit.messageHandlers.collectGzhu.postMessage({body: "'"+goods_id+"'"});
}else{
window.webkit.messageHandlers.collectGzhu.postMessage({body: 'toLogin'});
}
}catch (e){
//浏览器
alert(e);
}
//oc原生处理:
if ([message.name isEqualToString:@"collectIsLogin"]) {
NSDictionary * messageDict = (NSDictionary *)message.body;
if ([messageDict[@"body"] isEqualToString:@"toLogin"]) {
NSLog(@"登录");
}else{
NSLog(@"正常跳转");
NSLog(@"mess --- id == %@",message.body);
}
}
}
3.在交互中,关于alert (单对话框)函数、confirm(yes/no对话框)函数、prompt(输入型对话框)函数时,实现代理协议 WKUIDelegate ,则系统方法里有三个对应的协议方法.大家可以进入WKUIDelegate 协议类里面查看.
#pragma mark - WKUIDelegate
- (void)webViewDidClose:(WKWebView *)webView {
NSLog(@"%s", __FUNCTION__);
}
// 在JS端调用alert函数时，会触发此代理方法。
// JS端调用alert时所传的数据可以通过message拿到
// 在原生得到结果后，需要回调JS，是通过completionHandler回调
- (void)webView:(WKWebView *)webView runJavaScriptAlertPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(void))completionHandler {
NSLog(@"%s", __FUNCTION__);
UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"alert" message:@"JS调用alert" preferredStyle:UIAlertControllerStyleAlert];
[alert addAction:[UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
completionHandler();
}]];
[self presentViewController:alert animated:YES completion:NULL];
NSLog(@"%@", message);
}
// JS端调用confirm函数时，会触发此方法
// 通过message可以拿到JS端所传的数据
// 在iOS端显示原生alert得到YES/NO后
// 通过completionHandler回调给JS端
- (void)webView:(WKWebView *)webView runJavaScriptConfirmPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(BOOL result))completionHandler {
NSLog(@"%s", __FUNCTION__);
UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"confirm" message:@"JS调用confirm" preferredStyle:UIAlertControllerStyleAlert];
[alert addAction:[UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
completionHandler(YES);
}]];
[alert addAction:[UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
completionHandler(NO);
}]];
[self presentViewController:alert animated:YES completion:NULL];
NSLog(@"%@", message);
}
// JS端调用prompt函数时，会触发此方法
// 要求输入一段文本
// 在原生输入得到文本内容后，通过completionHandler回调给JS
- (void)webView:(WKWebView *)webView runJavaScriptTextInputPanelWithPrompt:(NSString *)prompt defaultText:(nullable NSString *)defaultText initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(NSString * __nullable result))completionHandler {
NSLog(@"%s", __FUNCTION__);
NSLog(@"%@", prompt);
UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"textinput" message:@"JS调用输入框" preferredStyle:UIAlertControllerStyleAlert];
[alert addTextFieldWithConfigurationHandler:^(UITextField * _Nonnull textField) {
textField.textColor = [UIColor redColor];
}];
[alert addAction:[UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
completionHandler([[alert.textFields lastObject] text]);
}]];
[self presentViewController:alert animated:YES completion:NULL];
}
