最近項目里用到了web界面與js交互，項目使用的是UIWebView，但是會出現數據丟失的情況比較麻煩，使用WKWebView可以避免這種情況，下面就寫一些web的基本使用，可能有些使用不當的地方，請指教。 * UIWebView 創建一個類文件，可以定義交互時的函數名，然后定義一個代理，在web界面調用進行相應的操作。 “` //類的.h文件 # import
//類的.m文件 #import "KQJSModel.h"#import "KQPayTypeViewController.h"@implementation KQJSModel-(void)startPay:(int)amount Action:(NSString *)action Teamid:(NSString *)teamid{ NSLog(@"--------amount:%d---------action:%@------teamid:%@",amount,action,teamid); if (self.delegate && [self.delegate respondsToSelector:@selector(goToPayVC:action:teamid:)]) { [self.delegate goToPayVC:amount action:[NSString stringWithFormat:@"%@",action] teamid:[NSString stringWithFormat:@"%@",teamid]]; }}@end//web界面,在代理方法里注入方法名，-(void)webViewDidStartLoad:(UIWebView *)webView{ //首先創建JSContext 對象（此處通過當前webView的鍵獲取到jscontext） JSContext *context=[webView valueForKeyPath:@"documentView.webView.mainFrame.javaScrJavascriptFromString:@"document.title"];; NSLog(@"-----網頁標題---%@",htmlTitle); self.title = [NSString stringWithFormat:@"%@",htmlTitle]; //首先創建JSContext 對象（此處通過當前webView的鍵獲取到jscontext） JSContext *context=[webView valueForKeyPath:@"documentView.webView.mainFrame.javaScriptContext"]; //第二種情況，js是通過對象調用的，我們假設js里面有一個對象 testobject 在調用方法 //首先創建我們新建類的對象，將他賦值給js的對象 KQJSModel *testJO=[[KQJSModel alloc] init]; testJO.delegate = self; //類的協議代理 context[@"IOSApp"]=testJO;}//再調用KQJSModel類的代理方法，在代理方法里實現想要的進行的操作。#PRagma mark -- KQJSModelDelegate-(void)goToPayVC:(int)amount action:(NSString *)action teamid:(NSString *)teamid{//進行界面跳轉，刷新，一定要在主線程里，不然會崩潰 dispatch_async(dispatch_get_main_queue(), ^{ KQPayTypeViewController *pay = [[KQPayTypeViewController alloc] init]; pay.money = [NSString stringWithFormat:@"%d",amount]; pay.action = [NSString stringWithFormat:@"%@",action]; pay.teamid = [NSString stringWithFormat:@"%@",teamid]; if (![action isEqualToString:@""] && action != nil) { pay.vip = @"vip"; } KQCommonNavController *nav = [[KQCommonNavController alloc]initWithRootViewController:pay]; [self presentViewController:nav animated:YES completion:nil]; });}以上就是UIWebView與js的交互，運行就可以進行相應的操作了。
WKWebView 最近才看了WKWebView的使用，就感覺比UIWebView流暢寫，然后自帶的導航進度條，這個感覺很方便，下面是與js的簡單的交互，有不正確的，請留言，謝謝~ #import "ViewController.h"#import <WebKit/WebKit.h>#define kScreenWidth [UIScreen mainScreen].bounds.size.width#define kScreenHeight [UIScreen mainScreen].bounds.size.height@interface ViewController ()<WKUIDelegate,WKNavigationDelegate,WKUIDelegate,WKScriptMessageHandler>@property (nonatomic, strong) WKWebView *wkWebView;@property (nonatomic, strong) WKWebViewConfiguration *wkConfig;/* *1.添加UIProgressView屬性 */@property (nonatomic, strong) UIProgressView *progressView;@end@implementation ViewController#pragma mark - 初始化wkWebView- (WKWebViewConfiguration *)wkConfig { if (!_wkConfig) { _wkConfig = [[WKWebViewConfiguration alloc] init]; _wkConfig.allowsInlineMediaPlayback = YES; _wkConfig.allowsPictureInPictureMediaPlayback = YES; _wkConfig.processPool = [[WKProcessPool alloc] init]; [_wkConfig.userContentController addScriptMessageHandler:self name:@"AppModel"]; //注入的js函數名， } return _wkConfig;}- (WKWebView *)wkWebView { if (!_wkWebView) { _wkWebView = [[WKWebView alloc] initWithFrame:CGRectMake(0, 0, kScreenWidth, kScreenHeight) configuration:self.wkConfig]; // 導航代理 _wkWebView.navigationDelegate = self; // 與webview UI交互代理 _wkWebView.UIDelegate = self; [self.view addSubview:_wkWebView]; } return _wkWebView;}/* *6.在dealloc中取消監聽 */- (void)dealloc { [self.wkWebView removeObserver:self forKeyPath:@"estimatedProgress"];}- (void)viewDidLoad { [super viewDidLoad]; [self startLoad]; /* *2.初始化progressView */ self.progressView = [[UIProgressView alloc] initWithFrame:CGRectMake(0, 64, [[UIScreen mainScreen] bounds].size.width, 2)]; self.progressView.backgroundColor = [UIColor blueColor]; //設置進度條的高度，下面這句代碼表示進度條的寬度變為原來的1倍，高度變為原來的1.5倍. self.progressView.transform = CGAffineTransformMakeScale(1.0f, 1.5f); [self.view addSubview:self.progressView]; /* *3.添加KVO，WKWebView有一個屬性estimatedProgress，就是當前網頁加載的進度，所以監聽這個屬性。 */ [self.wkWebView addObserver:self forKeyPath:@"estimatedProgress" options:NSKeyValueObservingOptionNew context:nil]; UIButton *bavkBtn = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 16, 20)]; [bavkBtn setImage:[UIImage imageNamed:@"navback"] forState:UIControlStateNormal]; [bavkBtn addTarget:self action:@selector(back) forControlEvents:UIControlEventTouchUpInside]; UIBarButtonItem *left = [[UIBarButtonItem alloc] initWithCustomView:bavkBtn]; self.navigationItem.leftBarButtonItem = left;}- (void)back{ if ([self.wkWebView canGoBack]) { [self.wkWebView goBack]; }}#pragma mark - start load web- (void)startLoad { NSString *urlString = @"http://www.baidu.com"; NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:urlString]]; request.timeoutInterval = 15.0f; [self.wkWebView loadRequest:request];}#pragma mark - 監聽/* *4.在監聽方法中獲取網頁加載的進度，并將進度賦給progressView.progress */- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary<NSString *,id> *)change context:(void *)context { if ([keyPath isEqualToString:@"estimatedProgress"]) { self.progressView.progress = self.wkWebView.estimatedProgress; if (self.progressView.progress == 1) { /* *添加一個簡單的動畫，將progressView的Height變為1.4倍 *動畫時長0.25s，延時0.3s后開始動畫 *動畫結束后將progressView隱藏 */ __weak typeof (self)weakSelf = self; [UIView animateWithDuration:0.25f delay:0.3f options:UIViewAnimationOptionCurveEaSEOut animations:^{ weakSelf.progressView.transform = CGAffineTransformMakeScale(1.0f, 1.4f); } completion:^(BOOL finished) { weakSelf.progressView.hidden = YES; }]; } }else{ [super observeValueForKeyPath:keyPath ofObject:object change:change context:context]; }}#pragma mark - WKWKNavigationDelegate Methods/* *5.在WKWebViewd的代理中展示進度條，加載完成后隱藏進度條 *///開始加載- (void)webView:(WKWebView *)webView didStartProvisionalNavigation:(WKNavigation *)navigation { NSLog(@"開始加載網頁"); //開始加載網頁時展示出progressView self.progressView.hidden = NO; //開始加載網頁的時候將progressView的Height恢復為1.5倍 self.progressView.transform = CGAffineTransformMakeScale(1.0f, 1.5f); //防止progressView被網頁擋住 [self.view bringSubviewToFront:self.progressView];}//加載完成- (void)webView:(WKWebView *)webView didFinishNavigation:(WKNavigation *)navigation { NSLog(@"加載完成");}//加載失敗- (void)webView:(WKWebView *)webView didFailProvisionalNavigation:(WKNavigation *)navigation withError:(NSError *)error { NSLog(@"加載失敗"); //加載失敗同樣需要隱藏progressView self.progressView.hidden = YES;}//頁面跳轉- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler { //允許頁面跳轉 NSLog(@"%@",navigationAction.request.URL); decisionHandler(WKNavigationActionPolicyAllow);}#pragma mark - WKUIDelegate- (void)webViewDidClose:(WKWebView *)webView { NSLog(@"%s", __FUNCTION__);}// 在JS端調用alert函數時，會觸發此代理方法。// JS端調用alert時所傳的數據可以通過message拿到// 在原生得到結果后，需要回調JS，是通過completionHandler回調- (void)webView:(WKWebView *)webView runJavaScriptAlertPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(void))completionHandler { NSLog(@"%s", __FUNCTION__); UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"alert" message:@"JS調用alert" preferredStyle:UIAlertControllerStyleAlert]; [alert addAction:[UIAlertAction actionWithTitle:@"確定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) { completionHandler(); }]]; [self presentViewController:alert animated:YES completion:NULL]; NSLog(@"%@", message);}// JS端調用confirm函數時，會觸發此方法// 通過message可以拿到JS端所傳的數據// 在iOS端顯示原生alert得到YES/NO后// 通過completionHandler回調給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調用confirm" preferredStyle:UIAlertControllerStyleAlert]; [alert addAction:[UIAlertAction actionWithTitle:@"確定" 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端調用prompt函數時，會觸發此方法// 要求輸入一段文本// 在原生輸入得到文本內容后，通過completionHandler回調給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調用輸入框" preferredStyle:UIAlertControllerStyleAlert]; [alert addTextFieldWithConfigurationHandler:^(UITextField * _Nonnull textField) { textField.textColor = [UIColor redColor]; }]; [alert addAction:[UIAlertAction actionWithTitle:@"確定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) { completionHandler([[alert.textFields lastObject] text]); }]]; [self presentViewController:alert animated:YES completion:NULL];}- (void)userContentController:(WKUserContentController *)userContentController didReceiveScriptMessage:(WKScriptMessage *)message{}新聞熱點
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