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UIWebView与WKWebView使用详解

程序员文章站 2022-04-19 23:09:40
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iOS网络3—UIWebView与WKWebView使用详解
阅读目录

一、整体介绍
二、UIWebView使用说明
三、WKWebView使用说明
四、示例代码
五、github代码下载
一、整体介绍
UIWebView自iOS2就有,WKWebView从iOS8才有,毫无疑问WKWebView将逐步取代笨重的UIWebView。通过简单的测试即可发现UIWebView占用过多内存,且内存峰值更是夸张。WKWebView网页加载速度也有提升,但是并不像内存那样提升那么多。下面列举一些其它的优势:

更多的支持HTML5的特性
官方宣称的高达60fps的滚动刷新率以及内置手势
Safari相同的JavaScript引擎
将UIWebViewDelegate与UIWebView拆分成了14类与3个协议(官方文档说明)
另外用的比较多的,增加加载进度属性:estimatedProgress
二、UIWebView使用说明
1 举例:简单的使用
UIWebView使用非常简单,可以分为三步,也是最简单的用法,显示网页

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  • (void)simpleExampleTest {
    // 1.创建webview,并设置大小,"20"为状态栏高度
    UIWebView *webView = [[UIWebView alloc] initWithFrame:CGRectMake(0, 20, self.view.frame.size.width, self.view.frame.size.height - 20)];
    // 2.创建请求
    NSMutableURLRequest *request =[NSMutableURLRequest requestWithURL:[NSURL URLWithString:@“http://www.cnblogs.com/mddblog/”]];
    // 3.加载网页
    [webView loadRequest:request];

    // 最后将webView添加到界面
    [self.view addSubview:webView];
    }
    复制代码
    2 一些实用函数
    加载函数。

  • (void)loadRequest:(NSURLRequest *)request;

  • (void)loadHTMLString:(NSString *)string baseURL:(nullable NSURL *)baseURL;

  • (void)loadData:(NSData *)data MIMEType:(NSString *)MIMEType textEncodingName:(NSString *)textEncodingName baseURL:(NSURL *)baseURL;
    UIWebView不仅可以加载HTML页面,还支持pdf、word、txt、各种图片等等的显示。下面以加载mac桌面上的png图片:/Users/coohua/Desktop/bigIcon.png为例

// 1.获取url
NSURL *url = [NSURL fileURLWithPath:@"/Users/coohua/Desktop/bigIcon.png"];
// 2.创建请求
NSURLRequest *request=[NSURLRequest requestWithURL:url];
// 3.加载请求
[self.webView loadRequest:request];
网页导航刷新有关函数
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// 刷新

  • (void)reload;
    // 停止加载
  • (void)stopLoading;
    // 后退函数
  • (void)goBack;
    // 前进函数
  • (void)goForward;
    // 是否可以后退
    @property (nonatomic, readonly, getter=canGoBack) BOOL canGoBack;
    // 是否可以向前
    @property (nonatomic, readonly, getter=canGoForward) BOOL canGoForward;
    // 是否正在加载
    @property (nonatomic, readonly, getter=isLoading) BOOL loading;
    复制代码
    3 代理协议使用:UIWebViewDelegate
    一共有四个方法

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/// 是否允许加载网页,也可获取js要打开的url,通过截取此url可与js交互

  • (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType {

    NSString *urlString = [[request URL] absoluteString];
    urlString = [urlString stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

    NSArray *urlComps = [urlString componentsSeparatedByString:@"?/"];
    NSLog(@“urlString=%@—urlComps=%@”,urlString,urlComps);
    return YES;
    }
    /// 开始加载网页

  • (void)webViewDidStartLoad:(UIWebView *)webView {
    NSURLRequest *request = webView.request;
    NSLog(@“webViewDidStartLoad-url=%@–%@”,[request URL],[request HTTPBody]);
    }
    /// 网页加载完成

  • (void)webViewDidFinishLoad:(UIWebView *)webView {
    NSURLRequest *request = webView.request;
    NSURL *url = [request URL];
    if ([url.path isEqualToString:@"/normal.html"]) {
    NSLog(@“isEqualToString”);
    }
    NSLog(@“webViewDidFinishLoad-url=%@–%@”,[request URL],[request HTTPBody]);
    NSLog(@"%@",[self.webView stringByEvaluatingJavaScriptFromString:@“document.title”]);
    }
    /// 网页加载错误

  • (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error {
    NSURLRequest *request = webView.request;
    NSLog(@“didFailLoadWithError-url=%@–%@”,[request URL],[request HTTPBody]);

}
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4 与js交互
主要有两方面:js执行OC代码、oc调取写好的js代码

js执行OC代码:js是不能执行oc代码的,但是可以变相的执行,js可以将要执行的操作封装到网络请求里面,然后oc拦截这个请求,获取url里面的字符串解析即可,这里用到代理协议的- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType函数。
oc调取写好的js代码:这里用到UIwebview的一个方法。示例代码一个是网页定位,一个是获取网页title:
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// 实现自动定位js代码, htmlLocationID为定位的位置(由js开发人员给出),实现自动定位代码,应该在网页加载完成之后再调用
NSString *javascriptStr = [NSString stringWithFormat:@“window.location.href = ‘#%@’”,htmlLocationID];
// webview执行代码
[self.webView stringByEvaluatingJavaScriptFromString:javascriptStr];

// 获取网页的title
NSString *title = [self.webView stringByEvaluatingJavaScriptFromString:@“document.title”];
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与js交互的实例
很多时候,我们要对网页做一些编辑,比如加载一个网页后,个别原因,我们不想显示新闻的来源,如下图的新闻来源“新华网”,网页的链接如下:http://op.inews.qq.com/mcms/h5/default/detail?id=NEW2016103101306200&refer=100000050(可能已经失效)

http://7xs4tc.com1.z0.glb.clouddn.com/webpage_label.png

那我们就可以使用js代码将这个标签去掉,且只留下时间。js代码的编写,根据火狐浏览器查看它的标签名称,然后做处理,如上图,具体代码如下:

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  • (void)deleteNewsSource {
    // 1.去掉页面标题
    NSMutableString *str = [NSMutableString string];
    // 去掉导航页,如果想把“腾讯新闻”导航栏一并去掉,就打开注释
    // [str appendString:@“document.getElementsByClassName(‘g-header’)[0].style.display = ‘none’;”];
    // 来源
    [str appendString:@“if(document.getElementsByClassName(‘g-wrapper-author’)[0].innerHTML.indexOf(’ ‘) == -1){document.getElementsByClassName(‘g-wrapper-author’)[0].innerHTML = document.getElementsByClassName(‘g-wrapper-author’)[0].innerHTML}else{document.getElementsByClassName(‘g-wrapper-author’)[0].innerHTML = document.getElementsByClassName(‘g-wrapper-author’)[0].innerHTML.split(’ ')[1];}”];
    // 执行js代码
    [_webView stringByEvaluatingJavaScriptFromString:str];
    }
    复制代码

代码执行的时机,一般情况下是等待网页加载完成- (void)webViewDidFinishLoad:(UIWebView *)webView里面执行,比较合理,但是有延迟,我们会发现刚开始有来源,然后突然又没有了,即js代码执行有延迟。

这样的话,我们可以在- (void)webViewDidStartLoad:(UIWebView *)webView网页开始加载里面开启一个定时器,比如定时0.2秒(根据需要自己设定),在定时器里面不停的调用- (void)deleteNewsSource方法即可解决。然后在- (void)webViewDidFinishLoad:(UIWebView *)webView里面关掉定时器。另外定时器容易引起循环引用,一定要注意释放。比如可以在viewDidDisappear方法里释放定时器。。。

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  • (void)webViewDidStartLoad:(UIWebView *)webView {
    // 1.去掉页面来源标签,时间根据需要自己设置,定时器在这里开启具有一定危险性
    NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval:0.2 target:self selector:@selector(deleteNewsSource) userInfo:nil repeats:YES];
    [[NSRunLoop mainRunLoop] addTimer:timer forMode:NSDefaultRunLoopMode];
    self.timer = timer;
    }
    复制代码

三、WKWebView使用说明
1 简单使用
与UIWebview一样,仅需三步:

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  • (void)simpleExampleTest {
    // 1.创建webview,并设置大小,"20"为状态栏高度
    WKWebView *webView = [[WKWebView alloc] initWithFrame:CGRectMake(0, 20, self.view.frame.size.width, self.view.frame.size.height - 20)];
    // 2.创建请求
    NSMutableURLRequest *request =[NSMutableURLRequest requestWithURL:[NSURL URLWithString:@“http://www.cnblogs.com/mddblog/”]];
    // 3.加载网页
    [webView loadRequest:request];

    // 最后将webView添加到界面
    [self.view addSubview:webView];
    }
    复制代码
    2 一些实用函数
    加载网页函数
    相比UIWebview,WKWebView也支持各种文件格式,并新增了loadFileURL函数,顾名思义加载本地文件,不要用loadRequest来加载本地HTML,另外,加载网页显示属于UI,所以应在主线程里面执行加载网页函数,不过即使在其它线程执行了加载网页函数,也没关系,苹果已做了处理,保证UI在主线程更新。
    复制代码
    /// 模拟器调试加载mac本地文件

  • (void)loadLocalFile {
    // 1.创建webview,并设置大小,“20"为状态栏高度
    WKWebView *webView = [[WKWebView alloc] initWithFrame:CGRectMake(0, 20, self.view.frame.size.width, self.view.frame.size.height - 20)];
    // 2.创建url userName:电脑用户名
    NSURL *url = [NSURL fileURLWithPath:@”/Users/userName/Desktop/bigIcon.png"];
    // 3.加载文件
    [webView loadFileURL:url allowingReadAccessToURL:url];
    // 最后将webView添加到界面
    [self.view addSubview:webView];
    }

/// 其它三个加载函数

  • (WKNavigation *)loadRequest:(NSURLRequest *)request;
  • (WKNavigation *)loadHTMLString:(NSString *)string baseURL:(nullable NSURL *)baseURL;
  • (WKNavigation *)loadData:(NSData *)data MIMEType:(NSString *)MIMEType characterEncodingName:(NSString *)characterEncodingName baseURL:(NSURL *)baseURL;
    复制代码
    网页导航刷新相关函数
    和UIWebview几乎一样,不同的是有返回值,WKNavigation(已更新),另外增加了函数reloadFromOrigin和goToBackForwardListItem。
    reloadFromOrigin会比较网络数据是否有变化,没有变化则使用缓存,否则从新请求。
    goToBackForwardListItem:比向前向后更强大,可以跳转到某个指定历史页面
    复制代码
    @property (nonatomic, readonly) BOOL canGoBack;
    @property (nonatomic, readonly) BOOL canGoForward;
  • (WKNavigation *)goBack;
  • (WKNavigation *)goForward;
  • (WKNavigation *)reload;
  • (WKNavigation *)reloadFromOrigin; // 增加的函数
  • (WKNavigation *)goToBackForwardListItem:(WKBackForwardListItem *)item; // 增加的函数
  • (void)stopLoading;
    复制代码
    一些常用属性
    allowsBackForwardNavigationGestures:BOOL类型,是否允许左右划手势导航,默认不允许
    estimatedProgress:加载进度,取值范围0~1
    title:页面title
    .scrollView.scrollEnabled:是否允许上下滚动,默认允许
    backForwardList:WKBackForwardList类型,访问历史列表,可以通过前进后退按钮访问,或者通过goToBackForwardListItem函数跳到指定页面
    执行js代码

/// jsStr为要执行的js代码,字符串形式
[webView evaluateJavaScript:jsStr completionHandler:^(id item, NSError * _Nullable error) {
// 执行结果回调
}];
3 代理协议使用
一共有三个代理协议:

WKNavigationDelegate:最常用,和UIWebViewDelegate功能类似,追踪加载过程,有是否允许加载、开始加载、加载完成、加载失败。下面会对函数做简单的说明,并用数字标出调用的先后次序:1-2-3-4-5
三个是否允许加载函数:

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/// 接收到服务器跳转请求之后调用 (服务器端redirect),不一定调用

  • (void)webView:(WKWebView *)webView didReceiveServerRedirectForProvisionalNavigation:(WKNavigation *)navigation;
    /// 3 在收到服务器的响应头,根据response相关信息,决定是否跳转。decisionHandler必须调用,来决定是否跳转,参数WKNavigationActionPolicyCancel取消跳转,WKNavigationActionPolicyAllow允许跳转
  • (void)webView:(WKWebView *)webView decidePolicyForNavigationResponse:(WKNavigationResponse *)navigationResponse decisionHandler:(void (^)(WKNavigationResponsePolicy))decisionHandler;
    /// 1 在发送请求之前,决定是否跳转
  • (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler;
    复制代码
    追踪加载过程函数:

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/// 2 页面开始加载

  • (void)webView:(WKWebView *)webView didStartProvisionalNavigation:(WKNavigation *)navigation;
    /// 4 开始获取到网页内容时返回
  • (void)webView:(WKWebView *)webView didCommitNavigation:(WKNavigation *)navigation;
    /// 5 页面加载完成之后调用
  • (void)webView:(WKWebView *)webView didFinishNavigation:(WKNavigation *)navigation;
    /// 页面加载失败时调用
  • (void)webView:(WKWebView *)webView didFailProvisionalNavigation:(WKNavigation *)navigation;
    复制代码
    WKScriptMessageHandler:必须实现的函数,是APP与js交互,提供从网页中收消息的回调方法,即js可以调用app的方法
    当然需要对webview做一些特殊处理,创建的时候调用initWithFrame:configuration:做一些配置,configuration为WKWebViewConfiguration类型,具体不再详述,代理方法如下:

/// message: 收到的脚本信息.

  • (void)userContentController:(WKUserContentController *)userContentController didReceiveScriptMessage:(WKScriptMessage *)message;
    当然,app也可以执行js代码,如下:
    /// jsStr为要执行的js代码,字符串形式
    [webView evaluateJavaScript:jsStr completionHandler:^(id item, NSError * _Nullable error) {
    // 执行结果回调
    }];
    WKUIDelegate:UI界面相关,原生控件支持,三种提示框:输入、确认、警告。首先将web提示框拦截然后再做处理。
    复制代码
    /// 创建一个新的WebView
  • (WKWebView *)webView:(WKWebView *)webView createWebViewWithConfiguration:(WKWebViewConfiguration *)configuration forNavigationAction:(WKNavigationAction *)navigationAction windowFeatures:(WKWindowFeatures *)windowFeatures;
    /// 输入框
  • (void)webView:(WKWebView *)webView runJavaScriptTextInputPanelWithPrompt:(NSString *)prompt defaultText:(nullable NSString *)defaultText initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(NSString * __nullable result))completionHandler;
    /// 确认框
  • (void)webView:(WKWebView *)webView runJavaScriptConfirmPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(BOOL result))completionHandler;
    /// 警告框
  • (void)webView:(WKWebView *)webView runJavaScriptAlertPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(void))completionHandler;
    复制代码
    四、示例代码
    代码可以实现一般网络显示,加载本地文件(pdf、word、txt、图片等等)
    搜索框搜索界面,搜索框输入file://则加载本地文件,http://则加载网络内容,如果两者都不是则搜索输入的关键字。
    下部网络导航,后退、前进、刷新、用Safari打开链接四个按钮

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/// 控件高度
#define kSearchBarH 44
#define kBottomViewH 44

/// 屏幕大小尺寸
#define kScreenWidth [UIScreen mainScreen].bounds.size.width
#define kScreenHeight [UIScreen mainScreen].bounds.size.height

#import “ViewController.h”
#import <WebKit/WebKit.h>

@interface ViewController () <UISearchBarDelegate, WKNavigationDelegate>

@property (nonatomic, strong) UISearchBar *searchBar;
/// 网页控制导航栏
@property (weak, nonatomic) UIView *bottomView;

@property (nonatomic, strong) WKWebView *wkWebView;

@property (weak, nonatomic) UIButton *backBtn;
@property (weak, nonatomic) UIButton *forwardBtn;
@property (weak, nonatomic) UIButton *reloadBtn;
@property (weak, nonatomic) UIButton *browserBtn;

@property (weak, nonatomic) NSString *baseURLString;

@end

@implementation ViewController

  • (void)viewDidLoad {
    [super viewDidLoad];
    // [self simpleExampleTest];

    [self addSubViews];
    [self refreshBottomButtonState];

    [self.wkWebView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@“http://www.cnblogs.com/mddblog/”]]];

}

  • (void)simpleExampleTest {
    // 1.创建webview,并设置大小,“20"为状态栏高度
    WKWebView *webView = [[WKWebView alloc] initWithFrame:CGRectMake(0, 20, self.view.frame.size.width, self.view.frame.size.height - 20)];
    // 2.创建请求
    NSMutableURLRequest *request =[NSMutableURLRequest requestWithURL:[NSURL URLWithString:@“http://www.cnblogs.com/mddblog/”]];
    // // 3.加载网页
    [webView loadRequest:request];
    // [webView loadFileURL:[NSURL fileURLWithPath:@”/Users/userName/Desktop/bigIcon.png"] allowingReadAccessToURL:[NSURL fileURLWithPath:@"/Users/userName/Desktop/bigIcon.png"]];
    // 最后将webView添加到界面
    [self.view addSubview:webView];
    }
    /// 模拟器加载mac本地文件

  • (void)loadLocalFile {
    // 1.创建webview,并设置大小,“20"为状态栏高度
    WKWebView *webView = [[WKWebView alloc] initWithFrame:CGRectMake(0, 20, self.view.frame.size.width, self.view.frame.size.height - 20)];
    // 2.创建url userName:电脑用户名
    NSURL *url = [NSURL fileURLWithPath:@”/Users/userName/Desktop/bigIcon.png"];
    // 3.加载文件
    [webView loadFileURL:url allowingReadAccessToURL:url];
    // 最后将webView添加到界面
    [self.view addSubview:webView];
    }

  • (void)addSubViews {
    [self addBottomViewButtons];

    [self.view addSubview:self.searchBar];

    [self.view addSubview:self.wkWebView];
    }

  • (void)addBottomViewButtons {
    // 记录按钮个数
    int count = 0;
    // 添加按钮
    UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
    [button setTitle:@“后退” forState:UIControlStateNormal];
    [button setTitleColor:[UIColor colorWithRed:249 / 255.0 green:102 / 255.0 blue:129 / 255.0 alpha:1.0] forState:UIControlStateNormal];
    [button setTitleColor:[UIColor lightGrayColor] forState:UIControlStateHighlighted];
    [button setTitleColor:[UIColor lightGrayColor] forState:UIControlStateDisabled];
    [button.titleLabel setFont:[UIFont systemFontOfSize:15]];
    button.tag = ++count; // 标记按钮
    [button addTarget:self action:@selector(onBottomButtonsClicled:) forControlEvents:UIControlEventTouchUpInside];
    [self.bottomView addSubview:button];
    self.backBtn = button;

    button = [UIButton buttonWithType:UIButtonTypeCustom];
    [button setTitle:@“前进” forState:UIControlStateNormal];
    [button setTitleColor:[UIColor colorWithRed:249 / 255.0 green:102 / 255.0 blue:129 / 255.0 alpha:1.0] forState:UIControlStateNormal];
    [button setTitleColor:[UIColor lightGrayColor] forState:UIControlStateHighlighted];
    [button setTitleColor:[UIColor lightGrayColor] forState:UIControlStateDisabled];
    [button.titleLabel setFont:[UIFont systemFontOfSize:15]];
    button.tag = ++count;
    [button addTarget:self action:@selector(onBottomButtonsClicled:) forControlEvents:UIControlEventTouchUpInside];
    [self.bottomView addSubview:button];
    self.forwardBtn = button;

    button = [UIButton buttonWithType:UIButtonTypeCustom];
    [button setTitle:@“重新加载” forState:UIControlStateNormal];
    [button setTitleColor:[UIColor colorWithRed:249 / 255.0 green:102 / 255.0 blue:129 / 255.0 alpha:1.0] forState:UIControlStateNormal];
    [button setTitleColor:[UIColor lightGrayColor] forState:UIControlStateHighlighted];
    [button setTitleColor:[UIColor lightGrayColor] forState:UIControlStateDisabled];
    [button.titleLabel setFont:[UIFont systemFontOfSize:15]];
    button.tag = ++count;
    [button addTarget:self action:@selector(onBottomButtonsClicled:) forControlEvents:UIControlEventTouchUpInside];
    [self.bottomView addSubview:button];
    self.reloadBtn = button;

    button = [UIButton buttonWithType:UIButtonTypeCustom];
    [button setTitle:@“Safari” forState:UIControlStateNormal];
    [button setTitleColor:[UIColor colorWithRed:249 / 255.0 green:102 / 255.0 blue:129 / 255.0 alpha:1.0] forState:UIControlStateNormal];
    [button setTitleColor:[UIColor lightGrayColor] forState:UIControlStateHighlighted];
    [button setTitleColor:[UIColor lightGrayColor] forState:UIControlStateDisabled];
    [button.titleLabel setFont:[UIFont systemFontOfSize:15]];
    button.tag = ++count;
    [button addTarget:self action:@selector(onBottomButtonsClicled:) forControlEvents:UIControlEventTouchUpInside];
    [self.bottomView addSubview:button];
    self.browserBtn = button;
    // 统一设置frame
    [self setupBottomViewLayout];
    }

  • (void)setupBottomViewLayout
    {
    int count = 4;
    CGFloat btnW = 80;
    CGFloat btnH = 30;

    CGFloat btnY = (self.bottomView.bounds.size.height - btnH) / 2;
    // 按钮间间隙
    CGFloat margin = (self.bottomView.bounds.size.width - btnW * count) / count;

    CGFloat btnX = margin * 0.5;
    self.backBtn.frame = CGRectMake(btnX, btnY, btnW, btnH);

    btnX = self.backBtn.frame.origin.x + btnW + margin;
    self.forwardBtn.frame = CGRectMake(btnX, btnY, btnW, btnH);

    btnX = self.forwardBtn.frame.origin.x + btnW + margin;
    self.reloadBtn.frame = CGRectMake(btnX, btnY, btnW, btnH);

    btnX = self.reloadBtn.frame.origin.x + btnW + margin;
    self.browserBtn.frame = CGRectMake(btnX, btnY, btnW, btnH);
    }
    /// 刷新按钮是否允许点击

  • (void)refreshBottomButtonState {
    if ([self.wkWebView canGoBack]) {
    self.backBtn.enabled = YES;
    } else {
    self.backBtn.enabled = NO;
    }

    if ([self.wkWebView canGoForward]) {
    self.forwardBtn.enabled = YES;
    } else {
    self.forwardBtn.enabled = NO;
    }
    }
    /// 按钮点击事件

  • (void)onBottomButtonsClicled:(UIButton *)sender {
    switch (sender.tag) {
    case 1:
    {
    [self.wkWebView goBack];
    [self refreshBottomButtonState];
    }
    break;
    case 2:
    {
    [self.wkWebView goForward];
    [self refreshBottomButtonState];
    }
    break;
    case 3:
    [self.wkWebView reload];
    break;
    case 4:
    [[UIApplication sharedApplication] openURL:self.wkWebView.URL];
    break;
    default:
    break;
    }
    }

#pragma mark - WKWebView WKNavigationDelegate 相关
/// 是否允许加载网页 在发送请求之前,决定是否跳转

  • (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler {

    NSString *urlString = [[navigationAction.request URL] absoluteString];

    urlString = [urlString stringByRemovingPercentEncoding];
    // NSLog(@“urlString=%@”,urlString);
    // 用://截取字符串
    NSArray *urlComps = [urlString componentsSeparatedByString:@"?/"];
    if ([urlComps count]) {
    // 获取协议头
    NSString *protocolHead = [urlComps objectAtIndex:0];
    NSLog(@“protocolHead=%@”,protocolHead);
    }
    decisionHandler(WKNavigationActionPolicyAllow);
    }

#pragma mark - searchBar代理方法
/// 点击搜索按钮

  • (void)searchBarSearchButtonClicked:(UISearchBar *)searchBar {
    // 创建url
    NSURL *url = nil;
    NSString *urlStr = searchBar.text;

    // 如果file://则为打开bundle本地文件,http则为网站,否则只是一般搜索关键字
    if([urlStr hasPrefix:@“file://”]){
    NSRange range = [urlStr rangeOfString:@“file://”];
    NSString *fileName = [urlStr substringFromIndex:range.length];
    url = [[NSBundle mainBundle] URLForResource:fileName withExtension:nil];
    // 如果是模拟器加载电脑上的文件,则用下面的代码
    // url = [NSURL fileURLWithPath:fileName];
    }else if(urlStr.length>0){
    if ([urlStr hasPrefix:@“http://”]) {
    url=[NSURL URLWithString:urlStr];
    } else {
    urlStr=[NSString stringWithFormat:@“http://www.baidu.com/s?wd=%@”,urlStr];
    }
    urlStr = [urlStr stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLQueryAllowedCharacterSet]];
    url=[NSURL URLWithString:urlStr];

    }
    NSURLRequest *request=[NSURLRequest requestWithURL:url];

    // 加载请求页面
    [self.wkWebView loadRequest:request];
    }
    #pragma mark - 懒加载

  • (UIView *)bottomView {
    if (_bottomView == nil) {
    UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, kScreenHeight - kBottomViewH, kScreenWidth, kBottomViewH)];
    view.backgroundColor = [UIColor colorWithRed:230/255.0 green:230/255.0 blue:230/255.0 alpha:1];
    [self.view addSubview:view];
    _bottomView = view;
    }
    return _bottomView;
    }

  • (UISearchBar *)searchBar {
    if (_searchBar == nil) {
    UISearchBar *searchBar = [[UISearchBar alloc] initWithFrame:CGRectMake(0, 20, kScreenWidth, kSearchBarH)];
    searchBar.delegate = self;
    searchBar.text = @“http://www.cnblogs.com/mddblog/”;
    _searchBar = searchBar;

    }
    return _searchBar;
    }

  • (WKWebView *)wkWebView {
    if (_wkWebView == nil) {
    WKWebView *webView = [[WKWebView alloc] initWithFrame:CGRectMake(0, 20 + kSearchBarH, kScreenWidth, kScreenHeight - 20 - kSearchBarH - kBottomViewH)];
    webView.navigationDelegate = self;
    // webView.scrollView.scrollEnabled = NO;

      //        webView.backgroundColor = [UIColor colorWithPatternImage:self.image];
      // 允许左右划手势导航,默认允许
      webView.allowsBackForwardNavigationGestures = YES;
      _wkWebView = webView;
    

    }

    return _wkWebView;
    }

@end

原文链接

相关标签: webview