在咱们平日的开发中,难免有原生与H5的交互,好比说:从原生页面的一个按钮,点击以后跳转到了一个H5的页面A,A页面中又有一个按钮,点击以后,又加载了一个新的H5页面B,从B点击一个按钮,又加载一个新的H5页面C,若是此时咱们点击左上角的返回按钮,会直接返回到咱们的原生页面;html
是否是上面给用户的体验很很差(固然残品经理会以为是,咱们都是无所谓的啦),此时咱们想要从新定制返回按钮,咱们想要从C页面判断是否还有上一级H5页面可供返回,若是有上一级页面仍是H5,点击左上角的返回则返回到B页面,而且在B页面的左上角加上一个关闭按钮,这个关闭按钮的做用主要是为了关闭全部的H5的页面,直接返回到咱们原生的页面;若是咱们不点击关闭按钮,仍是点击返回,则从B页面返回到A页面;再次点击返回,则关闭了H5的页面,回到了原生的页面;git
说的也许有点儿绕,不过大体思想就是:先判断当前的H5页面是否能够返回:github
//判断当前H5是否能够返回 [self.webView canGoBack]
若是能够返回,则返回到上一个H5页面,并在左上角添加一个关闭按钮,若是不能够返回,则直接:web
//回到原生页面 [self.navigationController popViewControllerAnimated:YES];
下面是个人主要实现代码,我写一个继承与UIViewController的类,接受了UIWebviewDelegate,并定义了一个UIwebview的属性,给外面留了一个方法,只须要传递一个URL,咱们就能够加载;若是有地方须要加载H5的页面,咱们能够直接集成与这个类,这样的好处在于方便维护;网络
固然我封装的这个类,同时也是支持HTTPS的请求的;话很少说,代码以下:ide
建立一个类,继承与UIViewController,.h中的代码函数
#import <UIKit/UIKit.h> @interface SYWebViewController : UIViewController<UIWebViewDelegate, NSURLConnectionDelegate> //定义一个属性,方便外接调用 @property (nonatomic, strong) UIWebView *webView; //声明一个方法,外接调用时,只须要传递一个URL便可 - (void)loadHTML:(NSString *)htmlString; @end
.m中的实现以下:字体
#import "SYWebViewController.h" @interface NSURLRequest (InvalidSSLCertificate) + (BOOL)allowsAnyHTTPSCertificateForHost:(NSString*)host; + (void)setAllowsAnyHTTPSCertificate:(BOOL)allow forHost:(NSString*)host; @end @interface SYWebViewController () @property (nonatomic, strong) NSURLRequest *request; //判断是不是HTTPS的 @property (nonatomic, assign) BOOL isAuthed; //返回按钮 @property (nonatomic, strong) UIBarButtonItem *backItem; //关闭按钮 @property (nonatomic, strong) UIBarButtonItem *closeItem; @end @implementation SYWebViewController - (void)viewDidLoad { [super viewDidLoad]; self.view.backgroundColor = [UIColor whiteColor]; self.webView = [[UIWebView alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height - 64)]; [self.view addSubview:self.webView]; [self addLeftButton]; } //加载URL - (void)loadHTML:(NSString *)htmlString { NSURL *url = [NSURL URLWithString:htmlString]; self.request = [NSURLRequest requestWithURL:url cachePolicy:NSURLRequestReloadIgnoringLocalCacheData timeoutInterval:5.0]; [NSURLRequest setAllowsAnyHTTPSCertificate:YES forHost:[url host]]; [self.webView loadRequest:self.request]; } #pragma mark - UIWebViewDelegate //开始加载 - (BOOL)webView:(UIWebView *)awebView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType { NSString* scheme = [[request URL] scheme]; //判断是否是https if ([scheme isEqualToString:@"https"]) { //若是是https:的话,那么就用NSURLConnection来重发请求。从而在请求的过程中吧要请求的URL作信任处理。 if (!self.isAuthed) { NSURLConnection* conn = [[NSURLConnection alloc] initWithRequest:request delegate:self]; [conn start]; [awebView stopLoading]; return NO; } } return YES; } //设置webview的title为导航栏的title - (void)webViewDidFinishLoad:(UIWebView *)webView { self.title = [webView stringByEvaluatingJavaScriptFromString:@"document.title"]; } #pragma mark ================= NSURLConnectionDataDelegate <NSURLConnectionDelegate> - (BOOL)connection:(NSURLConnection *)connection canAuthenticateAgainstProtectionSpace:(NSURLProtectionSpace *)protectionSpace { return [protectionSpace.authenticationMethod isEqualToString:NSURLAuthenticationMethodServerTrust]; } - (void)connection:(NSURLConnection *)connection willSendRequestForAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge { if ([challenge previousFailureCount] == 0) { self.isAuthed = YES; //NSURLCredential 这个类是表示身份验证凭据不可变对象。凭证的实际类型声明的类的构造函数来肯定。 NSURLCredential *cre = [NSURLCredential credentialForTrust:challenge.protectionSpace.serverTrust]; [challenge.sender useCredential:cre forAuthenticationChallenge:challenge]; } } - (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error { NSLog(@"网络不给力"); } - (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response { self.isAuthed = YES; //webview 从新加载请求。 [self.webView loadRequest:self.request]; [connection cancel]; } #pragma mark - 添加关闭按钮 - (void)addLeftButton { self.navigationItem.leftBarButtonItem = self.backItem; } //点击返回的方法 - (void)backNative { //判断是否有上一层H5页面 if ([self.webView canGoBack]) { //若是有则返回 [self.webView goBack]; //同时设置返回按钮和关闭按钮为导航栏左边的按钮 self.navigationItem.leftBarButtonItems = @[self.backItem, self.closeItem]; } else { [self closeNative]; } } //关闭H5页面,直接回到原生页面 - (void)closeNative { [self.navigationController popViewControllerAnimated:YES]; } #pragma mark - init - (UIBarButtonItem *)backItem { if (!_backItem) { _backItem = [[UIBarButtonItem alloc] init]; UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom]; //这是一张“<”的图片,可让美工给切一张 UIImage *image = [UIImage imageNamed:@"sy_back"]; [btn setImage:image forState:UIControlStateNormal]; [btn setTitle:@"返回" forState:UIControlStateNormal]; [btn addTarget:self action:@selector(backNative) forControlEvents:UIControlEventTouchUpInside]; [btn.titleLabel setFont:[UIFont systemFontOfSize:17]]; [btn setTitleColor:[UIColor sy_backColor] forState:UIControlStateNormal]; //字体的多少为btn的大小 [btn sizeToFit]; //左对齐 btn.contentHorizontalAlignment = UIControlContentHorizontalAlignmentLeft; //让返回按钮内容继续向左边偏移15,若是不设置的话,就会发现返回按钮离屏幕的左边的距离有点儿大,不美观 btn.contentEdgeInsets = UIEdgeInsetsMake(0, -15, 0, 0); btn.frame = CGRectMake(0, 0, 40, 40); _backItem.customView = btn; } return _backItem; } - (UIBarButtonItem *)closeItem { if (!_closeItem) { _closeItem = [[UIBarButtonItem alloc] initWithTitle:@"关闭" style:UIBarButtonItemStylePlain target:self action:@selector(closeNative)]; } return _closeItem; } @end
具体的使用方法就是,建立一个类,继承与这类:SYWebViewControlleratom
#import <UIKit/UIKit.h> #import "SYWebViewController.h" @interface SYFlashHTMLViewController : SYWebViewController @end
而后在这个类的.m中的viewDidLoad中,调用父视图加载URL的方法,即:lua
- (void)viewDidLoad { [super viewDidLoad]; self.webView.delegate = self; [self loadHTML:self.htmlString]; }
效果以下图:打开百度(图片1),点击图片进入(图片2),点击返回返回到(图片3),图片1和图片的区别在于多了个关闭按钮:
GitHub地址:https://github.com/FirstDKS521/DKSWebView 纯手打,喜欢点个赞,但愿对看到的你有所帮助!!!