WebView的几种使用方法：
首先：配置Plist文件 可以进行网络请求
Property Plist
或者：Source Code写入HTML格式
Source Code
否则:你懂得~~😂
未配置Plist文件，请求失败
使用StoryBoard拖3个WebView，平分了整个屏幕：
StoryBoard创建好界面
再把背景色设置为紫色。
三个WebView：
@property (strong, nonatomic) IBOutlet UIWebView *webV_1;
@property (strong, nonatomic) IBOutlet UIWebView *webV_2;
@property (strong, nonatomic) IBOutlet UIWebView *webV_3;
获取本地文件内容（HTML文件）
创建本地文件
创建、命名
在“MyCreateFile.html”本地文件，编辑HTML格式的内容：
<html>
<meta charset="UTF-8">
<head lang="en">
<meta charset="UTF-8">
<h1 style='color:blue'>
What's The Fox say？
</h1>
</head>
<br> </br>
<body>
<h1>What's The Fox say？</h1> <!-- 一级标题 -->
<h2>我的HTML标题Lev2</h2>
<h3>我的HTML标题Lev3</h3>
<h4>我的HTML标题Lev4</h4>
<h5>我的HTML标题Lev5</h5>
<h6>我的HTML标题Lev6</h6> <!-- 六级标题 -->
<p>
<p style='color:red'> <!-- 颜色改变 -->
老子的HTML学习第一次
</p>
<p>
劳资的HTML学习第一次 What's The Fox says
劳资HTML学习第一次 劳资HTML学习第一次
劳资HTML学习第一次劳资HTML学习第一次
</p>
<input type="button" value="按钮">
<input type = "color"> <br/> <!-- <br/>:自动换行 -->
<!-- <br />=<br>...</br> -->
<input type = "text" placeholder="请输入账号"> <br/>
<a href="https://www.baidu.com">百度一下，你就上当
</a>
<form>
<input type='checkbox' name='sex' value='male' selected=selected>程序员
<input type='checkbox' name='sex' value='male' selected=selected>老板 <br/> <!-- checkbox:多选框 -->
<input type='radio' name='sex' value='male' selected=selected>男人
<input type='radio' name='sex' value='female'>女人 <!-- radio:单选框 -->
</form>
</body>
</html>
[self loadLocalHtml];
-(void)loadLocalHtml
{
//1.从本地获取HTML文件
NSString * path = [[NSBundle mainBundle] pathForResource:@"MyCreateFile" ofType:@"html"];
//2.从文件中获取HTML字符串
NSString * htmlStr = [NSString stringWithContentsOfFile:path encoding:NSUTF8StringEncoding error:nil];
//3.加载在webview中
[self.webV_1 loadHTMLString:htmlStr baseURL:nil];
//4.可以 加载在Label的⭐️富文本⭐️中 (但是只能观看~😂😂😂)
//NSData * data = [htmlStr dataUsingEncoding:NSUTF8StringEncoding]; //Label的字体 大小 并不能影响 html字体的大小
//NSAttributedString * str = [[NSAttributedString alloc] initWithData:data options:@{NSDocumentTypeDocumentAttribute:NSHTMLTextDocumentType} documentAttributes:nil error:nil];
//self.htmlLB.attributedText = str;
}
[self.webV_1 loadHTMLString:htmlStr baseURL:nil];
对于“[ loadHTMLString: baseURL: ]”方法，可以替换为：
NSURL * webURL = [NSURL fileURLWithPath:path]; //通过文件路径字符串获取URL
NSURLRequest * URLRequest = [NSURLRequest requestWithURL:webURL];//设置请求 提交的相关URL
[self.webV_1 loadRequest:URLRequest]; //提交请求
好处：URL(统一资源定位符~~)不但可以获取本地文件内容，也可以加载网络信息。
当然“[ loadHTMLString: baseURL: ]”方法可以加载HTML格式或CSS格式的网络信息！ 之前自己只是将网络上请求的信息(CSS格式)加载出来了而已！
之前处理 网络**请求到的**CCS格式的信息
网上说法：⭐️baseURL如果是一个网络路径，就能加载 网络上的CSS信息了！⭐️但是自己还没试过。。。。。
希望明白的朋友指点一下~ ！
苹果官方 不推荐用来加载网络信息：(😂 当然有时候 官方就是屁~)
“ - loadHTMLString:baseURL: ”方法
“ - loadRequest: ”方法
本地HTML文件加载 展示效果
总结：
1.“<head></head>”部分 只有一个蓝色标题。
2.“<br><br/>”效果与“<br/> ”相同 (换行操作)。
3.“程序员”、“老板” 为多选项；“男人”、“女人” 为单选项。
4.点击“百度一下，你就上当”，进入百度网页。
※5.WebView的背景色跟UIScrollView一样(包含了一个UIScrollView属性)，蓝色会被内容视图遮挡。
从服务器加载 HTML页面
[self loadInternetHtml];
//从服务器加载HTML页面
-(void)loadInternetHtml
{
//加载服务器HTML页面的 模式
// NSString *urlStr = [NSString stringWithFormat:@"%@/appservice/getAnnouncementDetail.do?id=%@",O2O_URL,self.idStr];
NSString *urlStr = @"https://www.baidu.com";
NSURL *url = [NSURL URLWithString:urlStr];
NSLog(@"url:%@",url);
NSURLRequest *request = [NSURLRequest requestWithURL:url];
[self.webV_1 loadRequest:request];
}
直接跳转到 所需要展示的页面
使用WebView的delegate方法：
@interface ViewController () <UIWebViewDelegate> // 设置代理
[self useWebViewDelegate];
-(void)useWebViewDelegate
{
self.webV_2.delegate = self; // ⭐️设置代理
self.webV_2.scrollView.bounces = NO;//禁止WebView的弹簧效果
NSString *urlStr = @"https://www.baidu.com";
NSURL *url = [NSURL URLWithString:urlStr];
NSLog(@"url:%@",url);
NSURLRequest * request = [NSURLRequest requestWithURL:url];
[self.webV_2 loadRequest:request];
}
#pragma mark - UIWebView Delegate
- (void)webViewDidStartLoad:(UIWebView *)webView
{ 开始加载时调用的方法
}
- (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error
{加载失败时调用的方法
}
// 禁止webview中的链接点击 (用于 ：⭐️过滤 请求条件)
-(BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest*)request navigationType:(UIWebViewNavigationType)navigationType
{ // 页面准备加载内容时调用，通过返回值来进行判断是否要加载
if (webView == self.webV_2) { // 是第二个WebView
if(navigationType == UIWebViewNavigationTypeLinkClicked)
{ //判断点击的是否为 链接
return NO; //返回“NO”，不加载到链接的页面
}else{
return YES;
}
} else { // 其他WebView可以响应 链接
return YES;
}
}
加载效果：
第二个WebView每次点击到响应的类型，都会判断是否为“链接”类型：如果是，不予响应(进入链接页面)。如果点击的 是链接类型，不予响应
-(void)webViewDidFinishLoad:(UIWebView *)webView
{ // 加载完后触发
if (webView == self.webV_2) { // 是第二个WebView
NSString * fontStr = @"document.getElementsByTagName('body')[0].style.webkitTextSizeAdjust= '50%'";//字体大小
// ………………
[self.webV_2 stringByEvaluatingJavaScriptFromString:fontStr];
}
}
加载效果：
第二个WebView的字体，缩小为原来的50%
JavaScript方式，操作web数据
需要等UIWebView中的页面加载完成之后去调用。
“ - (NSString *)stringByEvaluatingJavaScriptFromString:(NSString *)script;”方法向UIWebView传递一段需要执行的JavaScript代码，最后获取执行结果。
在 - (void)viewDidLoad { }里面：
[self useJavaScriptWay];
-(void)useJavaScriptWay {
self.webV_3.delegate = self; //设置代理
NSURL *url =[[NSURL alloc] initWithString:@"https://www.baidu.com"];
NSURLRequest *request = [[NSURLRequest alloc] initWithURL:url];
[self.webV_3 loadRequest:request];
}
在页面加载完成后，去调用WebView的“stringByEvaluatingJavaScriptFromString”方法:
-(void)webViewDidFinishLoad:(UIWebView *)webView
{ // 加载完后触发
if (webView == self.webV_3) {
[self changeValueForUsingJavaScriptWay];
}
}
-(void)changeValueForUsingJavaScriptWay {
// 获取当前页面的URL
NSString *currentURL = [self.webV_3 stringByEvaluatingJavaScriptFromString:@"document.location.href"];
//获取当前页面的标题名称
NSString *title = [self.webV_3 stringByEvaluatingJavaScriptFromString:@"document.title"];
NSLog(@"%URL:@====title:%@",currentURL,title);
// ⭐️交互格式⭐️
//[self.webV_3 stringByEvaluatingJavaScriptFromString:@"方法名(%@)",参数] ];
//插入js代码
//[self.webV_3 stringByEvaluatingJavaScriptFromString:@"var script = document.createElement('script');"
//"script.type = 'text/javascript';"
//"script.text = \"function myFunction() { "
//"var field = document.getElementsByName('q')[0];"
//"field.value='goyoholBest.com';"
//"document.forms[0].submit();"
//"}\";"
//"document.getElementsByTagName('head')[0].appendChild(script);"];
//给网页增加utf-8编码
//[self.webV_3 stringByEvaluatingJavaScriptFromString:
//@"var tagHead =document.documentElement.firstChild;"
//"var tagMeta = document.createElement(\"meta\");"
//"tagMeta.setAttribute(\"http-equiv\", \"Content-Type\");"
//"tagMeta.setAttribute(\"content\", \"text/html; charset=utf-8\");"
//"var tagHeadAdd = tagHead.appendChild(tagMeta);"];
//给网页增加css样式
//[self.webV_3 stringByEvaluatingJavaScriptFromString:
//@"var tagHead =document.documentElement.firstChild;"
//"var tagStyle = document.createElement(\"style\");"
//"tagStyle.setAttribute(\"type\", \"text/css\");"
//"tagStyle.appendChild(document.createTextNode(\"BODY{padding: 20pt 15pt}\"));"
//"var tagHeadAdd = tagHead.appendChild(tagStyle);"];
//拦截网页图片 并修改图片大小
[self.webV_3 stringByEvaluatingJavaScriptFromString:
@"var script = document.createElement('script');"
"script.type = 'text/javascript';"
"script.text = \"function ResizeImages() { "
"var myimg,oldwidth;"
"var maxwidth=50;" //缩放系数
"for(i=0;i <document.images.length;i++){"
"myimg = document.images[i];"
"if(myimg.width > maxwidth){"
"oldwidth = myimg.width;"
"myimg.width = maxwidth;"
"myimg.height = myimg.height * (maxwidth/oldwidth);"
"}"
"}"
"}\";"
"document.getElementsByTagName('head')[0].appendChild(script);"];
[self.webV_3 stringByEvaluatingJavaScriptFromString:@"ResizeImages();"];
}
加载的效果：图片被缩小 及 进入一个页面打印其URL及title信息
图片被缩小
2016-12-26 01:39:52.008 WebViewUse-Demo[3221:164983] https://www.baidu.com/====百度一下
2016-12-26 01:39:58.571 WebViewUse-Demo[3221:164983] https://www.baidu.com/#iact=wiseindex%2Ftabs%2Fnews%2Factivity%2Fnewsdetail%3D%257B%2522linkData%2522%253A%257B%2522name%2522%253A%2522iframe%252Fmib-iframe%2522%252C%2522id%2522%253A%2522feed%2522%252C%2522index%2522%253A0%252C%2522url%2522%253A%2522https%253A%252F%252Fm.baidu.com%252Ffeed%252Fdata%252Flandingpage%253Fnid%253D3286129817483816749%2526n_type%253D1%2526p_from%253D2%2522%252C%2522title%2522%253A%2522%25E7%2588%25B1%25E7%25BE%258E%25E5%25B0%25B1%25E8%25A6%2581%25E7%2598%25A6%25E7%2598%25A6%25E7%2598%25A6%2522%257D%257D====百度一下
2016-12-26 01:39:59.196 WebViewUse-Demo[3221:164983] https://www.baidu.com/#iact=wiseindex%2Ftabs%2Fnews%2Factivity%2Fnewsdetail%3D%257B%2522linkData%2522%253A%257B%2522name%2522%253A%2522iframe%252Fmib-iframe%2522%252C%2522id%2522%253A%2522feed%2522%252C%2522index%2522%253A0%252C%2522url%2522%253A%2522https%253A%252F%252Fm.baidu.com%252Ffeed%252Fdata%252Flandingpage%253Fnid%253D3286129817483816749%2526n_type%253D1%2526p_from%253D2%2522%252C%2522title%2522%253A%2522%25E7%2588%25B1%25E7%25BE%258E%25E5%25B0%25B1%25E8%25A6%2581%25E7%2598%25A6%25E7%2598%25A6%25E7%2598%25A6%2522%257D%257D====百度一下
2016-12-26 01:40:11.736 WebViewUse-Demo[3221:164983] https://www.baidu.com/#iact=wiseindex%2Ftabs%2Fnews%2Factivity%2Fnewsdetail%3D%257B%2522linkData%2522%253A%257B%2522name%2522%253A%2522iframe%252Fmib-iframe%2522%252C%2522id%2522%253A%2522feed%2522%252C%2522index%2522%253A0%252C%2522url%2522%253A%2522https%253A%252F%252Fm.baidu.com%252Ffeed%252Fdata%252Flandingpage%253Fdsp%253Dwise%2526nid%253D3267967319825678069%2526n_type%253D1%2526p_from%253D3%2522%257D%257D====百度一下
2016-12-26 01:40:12.039 WebViewUse-Demo[3221:164983] https://www.baidu.com/#iact=wiseindex%2Ftabs%2Fnews%2Factivity%2Fnewsdetail%3D%257B%2522linkData%2522%253A%257B%2522name%2522%253A%2522iframe%252Fmib-iframe%2522%252C%2522id%2522%253A%2522feed%2522%252C%2522index%2522%253A0%252C%2522url%2522%253A%2522https%253A%252F%252Fm.baidu.com%252Ffeed%252Fdata%252Flandingpage%253Fdsp%253Dwise%2526nid%253D3267967319825678069%2526n_type%253D1%2526p_from%253D3%2522%257D%257D====百度一下
2016-12-26 01:41:11.831 WebViewUse-Demo[3221:164983] https://www.baidu.com/#iact=wiseindex%2Ftabs%2Fnews%2Factivity%2Fnewsdetail%3D%257B%2522linkData%2522%253A%257B%2522name%2522%253A%2522iframe%252Fmib-iframe%2522%252C%2522id%2522%253A%2522feed%2522%252C%2522index%2522%253A0%252C%2522url%2522%253A%2522https%253A%252F%252Fm.baidu.com%252Ffeed%252Fdata%252Flandingpage%253Fnid%253D3286129817483816749%2526n_type%253D1%2526p_from%253D2%2522%252C%2522title%2522%253A%2522%25E7%2588%25B1%25E7%25BE%258E%25E5%25B0%25B1%25E8%25A6%2581%25E7%2598%25A6%25E7%2598%25A6%25E7%2598%25A6%2522%257D%257D====百度一下
2016-12-26 01:41:12.409 WebViewUse-Demo[3221:164983] https://www.baidu.com/#iact=wiseindex%2Ftabs%2Fnews%2Factivity%2Fnewsdetail%3D%257B%2522linkData%2522%253A%257B%2522name%2522%253A%2522iframe%252Fmib-iframe%2522%252C%2522id%2522%253A%2522feed%2522%252C%2522index%2522%253A0%252C%2522url%2522%253A%2522https%253A%252F%252Fm.baidu.com%252Ffeed%252Fdata%252Flandingpage%253Fnid%253D3286129817483816749%2526n_type%253D1%2526p_from%253D2%2522%252C%2522title%2522%253A%2522%25E7%2588%25B1%25E7%25BE%258E%25E5%25B0%25B1%25E8%25A6%2581%25E7%2598%25A6%25E7%2598%25A6%25E7%2598%25A6%2522%257D%257D====百度一下
2016-12-26 01:41:13.252 WebViewUse-Demo[3221:164983] https://www.baidu.com/#iact=wiseindex%2Ftabs%2Fnews%2Factivity%2Fnewsdetail%3D%257B%2522linkData%2522%253A%257B%2522name%2522%253A%2522iframe%252Fmib-iframe%2522%252C%2522id%2522%253A%2522feed%2522%252C%2522index%2522%253A0%252C%2522url%2522%253A%2522https%253A%252F%252Fm.baidu.com%252Ffeed%252Fdata%252Flandingpage%253Fnid%253D3286129817483816749%2526n_type%253D1%2526p_from%253D2%2522%252C%2522title%2522%253A%2522%25E7%2588%25B1%25E7%25BE%258E%25E5%25B0%25B1%25E8%25A6%2581%25E7%2598%25A6%25E7%2598%25A6%25E7%2598%25A6%2522%257D%257D====百度一下
2016-12-26 01:41:13.599 WebViewUse-Demo[3221:164983] https://www.baidu.com/#iact=wiseindex%2Ftabs%2Fnews%2Factivity%2Fnewsdetail%3D%257B%2522linkData%2522%253A%257B%2522name%2522%253A%2522iframe%252Fmib-iframe%2522%252C%2522id%2522%253A%2522feed%2522%252C%2522index%2522%253A0%252C%2522url%2522%253A%2522https%253A%252F%252Fm.baidu.com%252Ffeed%252Fdata%252Flandingpage%253Fnid%253D3286129817483816749%2526n_type%253D1%2526p_from%253D2%2522%252C%2522title%2522%253A%2522%25E7%2588%25B1%25E7%25BE%258E%25E5%25B0%25B1%25E8%25A6%2581%25E7%2598%25A6%25E7%2598%25A6%25E7%2598%25A6%2522%257D%257D====百度一下
我现在看到“百度”，就😵😵😵
Tips：
使用较少的方法，也更自由：
- (void)loadData:(NSData *)data MIMEType:(NSString *)MIMEType textEncodingName:(NSString *)textEncodingName baseURL:(NSURL *)baseURL;
其中：data是文件数据，MIMEType是文件类型，textEncodingName是编码类型，baseURL是素材资源路径。
属性和变量:
@property (nonatomic,readonly,retain)UIScrollView *scrollView; // 内置的scrollView
@property (nonatomic,readonly,retain)NSURLRequest *request; // URL请求
@property (nonatomic,readonly,getter=canGoBack)BOOL canGoBack; // 获取能否返回上一级
@property (nonatomic,readonly,getter=canGoForward)BOOL canGoForward; // 获取能否跳转下一级
@property (nonatomic,readonly,getter=isLoading)BOOL loading; // 获取是否 正在加载数据
@property (nonatomic)UIDataDetectorTypes dataDetectorTypesNS_AVAILABLE_IOS(3_0); // 设置某些数据变为链接形式，这个枚举可以设置如电话号，地址，邮箱等转化为链接
@property (nonatomic)BOOL allowsInlineMediaPlaybackNS_AVAILABLE_IOS(4_0); // 设置是否使用内联播放器播放视频
@property (nonatomic)BOOL mediaPlaybackRequiresUserActionNS_AVAILABLE_IOS(4_0); // 设置视频是否自动播放
@property (nonatomic)BOOL mediaPlaybackAllowsAirPlayNS_AVAILABLE_IOS(5_0); // 设置音频播放是否支持AirPlay功能
@property (nonatomic)BOOL suppressesIncrementalRenderingNS_AVAILABLE_IOS(6_0); // 设置是否将数据加载如内存后渲染界面
@property (nonatomic)BOOL keyboardDisplayRequiresUserActionNS_AVAILABLE_IOS(6_0); // 设置用户交互模式
@property (nonatomic)UIWebPaginationMode paginationModeNS_AVAILABLE_IOS(7_0);
此属性是用来设置一种模式，当网页大小超出view时，可将网页设置成以“翻页”的效果展示，枚举如下：
typedef NS_ENUM(NSInteger, UIWebPaginationMode) {
UIWebPaginationModeUnpaginated, // 不使用翻页效果
UIWebPaginationModeLeftToRight, // 将网页超出部分分页，从左向右进行翻页
UIWebPaginationModeTopToBottom, // 将网页超出部分分页，从上向下进行翻页
UIWebPaginationModeBottomToTop, // 将网页超出部分分页，从下向上进行翻页
UIWebPaginationModeRightToLeft // 将网页超出部分分页，从右向左进行翻页
};
@property (nonatomic)CGFloat pageLengthNS_AVAILABLE_IOS(7_0); // 设置每一页的长度
@property (nonatomic)CGFloat gapBetweenPagesNS_AVAILABLE_IOS(7_0); // 设置每一页的间距
@property (nonatomic,readonly)NSUInteger pageCountNS_AVAILABLE_IOS(7_0); // 获取分页数
- (void)reload; // 重新加载数据
- (void)stopLoading; // 停止加载数据
- (void)goBack; // 返回上一级
- (void)goForward; // 跳转下一级
暂时就说这么多吧！！之后还会写一篇JS交互的文章~
也不知道什么时候了~~ ？哈哈😂😂
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