本文只是作为笔记，更多的解释看文末大神的解释
html文本
<!DOCTYPE html>
<html>
<head>
<title>iOS and Js</title>
<style type="text/css">
* {
font-size: 40px;
}
</style>
</head>
<body>
<div style="margin-top: 100px">
<br/>
<div><input type="button" value="不带参" onclick="buttomA()"></div>
<br/>
<div><input type="button" value="带参" onclick="buttomB()"></div><br/>
</div>
<div id="SwiftDiv">
<span id="jsParamFuncSpan" style="color: red; font-size: 50px;"></span>
</div>
<script type="text/javascript">
function buttomA() {
window.webkit.messageHandlers.showSendMsg.postMessage(null);
}
function buttomB() {
window.webkit.messageHandlers.showParameterMsg.postMessage(['参数One', '参数Two']);
}
function getJsValue() {
return "js中传递出来的分享内容";
}
</script>
</body>
</html>
OC代码
#import "WKWebViewController.h"
#import <WebKit/WebKit.h>
#define SCREEN_HEIGHT ([UIScreen mainScreen].bounds.size.height)
#define SCREEN_WIDTH ([UIScreen mainScreen].bounds.size.width)
#define NAV_HEIGHT [[UIApplication sharedApplication] statusBarFrame].size.height + self.navigationController.navigationBar.frame.size.height
@interface WKWebViewController ()<WKNavigationDelegate,UIScrollViewDelegate,WKUIDelegate,WKScriptMessageHandler>
@property (nonatomic, strong) WKWebView *wkwebView;
@property (nonatomic, strong) CALayer *progresslayer;
@end
@implementation WKWebViewController
- (CALayer *)progresslayer
{
if (!_progresslayer) {
UIView *progress = [[UIView alloc]initWithFrame:CGRectMake(0,0, SCREEN_WIDTH, 3)];
progress.backgroundColor = [UIColor clearColor];
[self.view addSubview:progress];
CALayer *layer = [CALayer layer];
layer.frame = CGRectMake(0, 0, 0, 3);
layer.backgroundColor = [UIColor orangeColor].CGColor;
[progress.layer addSublayer:layer];
self.progresslayer = layer;
}
return _progresslayer;
}
-(void)viewWillDisappear:(BOOL)animated{
[super viewWillDisappear:animated];
//避免引起循环引用，导致控制器无法被释
[self.wkwebView.configuration.userContentController removeScriptMessageHandlerForName:@"showSendMsg"];
[self.wkwebView.configuration.userContentController removeScriptMessageHandlerForName:@"showParameterMsg"];
}
- (void)viewDidLoad {
[super viewDidLoad];
self.title = @"WKWebView";
[self configWkWebView];
UIButton *rightBtn = [UIButton buttonWithType:UIButtonTypeCustom];
rightBtn.frame = CGRectMake(0, 0, 35, 35);
[rightBtn setTitle:@"分享" forState:UIControlStateNormal];
[rightBtn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
[rightBtn addTarget:self action:@selector(shareBtnClick) forControlEvents:UIControlEventTouchUpInside];
self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:rightBtn];
}
- (void )configWkWebView{
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.wkwebView = [[WKWebView alloc] initWithFrame:self.view.bounds configuration:config];
[self.wkwebView addObserver:self forKeyPath:@"estimatedProgress" options:NSKeyValueObservingOptionNew context:nil];
self.wkwebView.UIDelegate = self;
self.wkwebView.navigationDelegate =self;
[self.view addSubview:self.wkwebView];
NSString *filePath = [[NSBundle mainBundle] pathForResource:@"demo" ofType:@"html"];
NSURL *baseURL = [[NSBundle mainBundle] bundleURL];
[self.wkwebView loadHTMLString:[NSString stringWithContentsOfFile:filePath encoding:NSUTF8StringEncoding error:nil] baseURL:baseURL];
//js调OC
[config.userContentController addScriptMessageHandler:self name:@"showSendMsg"];
[config.userContentController addScriptMessageHandler:self name:@"showParameterMsg"];
}
#pragma mark - WKScriptMessageHandler
- (void)userContentController:(WKUserContentController *)userContentController didReceiveScriptMessage:(WKScriptMessage *)message{
//js调OC
if ([message.name isEqualToString:@"showSendMsg"]) {
//不带参按钮点击时间处理
[self showMsg:@"不带参"];
}
if ([message.name isEqualToString:@"showParameterMsg"]) {
//带参按钮点击时间处理
NSString *showMsg = @"";
NSArray *args = message.body;
for (NSString *str in args) {
NSLog(@"参数 ---- %@",str);
if ([showMsg isEqualToString:@""]) {
showMsg = [NSString stringWithFormat:@"%@",str];
}else{
showMsg = [NSString stringWithFormat:@"%@-%@",showMsg,str];
}
}
[self showMsg:showMsg];
}
}
- (void)showMsg:(NSString *)msg {
[[[UIAlertView alloc] initWithTitle:nil message:msg delegate:nil cancelButtonTitle:nil otherButtonTitles:@"OK", nil] show];
}
//进度条
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary<NSString *,id> *)change context:(void *)context{
if ([keyPath isEqualToString:@"estimatedProgress"]) {
self.progresslayer.opacity = 1;
if ([change[@"new"] floatValue] < [change[@"old"] floatValue]) {
return;
}
self.progresslayer.frame = CGRectMake(0, 0, self.view.bounds.size.width * [change[@"new"] floatValue], 3);
if ([change[@"new"] floatValue] == 1) {
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(.4 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
self.progresslayer.opacity = 0;
});
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(.5 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
self.progresslayer.frame = CGRectMake(0, 0, 0, 3);
});
}
}else{
[super observeValueForKeyPath:keyPath ofObject:object change:change context:context];
}
}
/**
清理网页缓存
*/
- (void)deleteWebCache {
if ([[UIDevice currentDevice].systemVersion floatValue] >= 9.0) {
NSSet *websiteDataTypes = [NSSet setWithArray:@[WKWebsiteDataTypeDiskCache,
//WKWebsiteDataTypeOfflineWebApplicationCache,
WKWebsiteDataTypeMemoryCache,
//WKWebsiteDataTypeLocalStorage,
//WKWebsiteDataTypeCookies,
//WKWebsiteDataTypeSessionStorage,
//WKWebsiteDataTypeIndexedDBDatabases,
//WKWebsiteDataTypeWebSQLDatabases
]];
//// Date from
NSDate *dateFrom = [NSDate dateWithTimeIntervalSince1970:0];
//// Execute
[[WKWebsiteDataStore defaultDataStore] removeDataOfTypes:websiteDataTypes modifiedSince:dateFrom completionHandler:^{
// Done
}];
} else {
NSString *libraryPath = [NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES) objectAtIndex:0];
NSString *cookiesFolderPath = [libraryPath stringByAppendingString:@"/Cookies"];
NSError *errors;
[[NSFileManager defaultManager] removeItemAtPath:cookiesFolderPath error:&errors];
}
}
- (void)dealloc{
[self deleteWebCache];
[(WKWebView *)self.wkwebView removeObserver:self forKeyPath:@"estimatedProgress"];
}
#pragma mark -- OC调用js
- (void)shareBtnClick{
//如果方法里需要传参数，需要用 '' 套着
[self.wkwebView evaluateJavaScript:@"getJsValue()" completionHandler:^(id _Nullable response, NSError * _Nullable error) {
//JS 返回结果
NSLog(@"返回结果-%@ \n错误-%@",response,error);
[self showMsg:[NSString stringWithFormat:@"JS中返回结果-%@",response]];
}];
}
@end
下面这个老表对于OC与js交互有比较全面的一套解释，从他的文章中可以学到很多👇
参考链接
Demo集合
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