新建一个html文件，如图
新建空的文件
保存为html文件
一、 1.1 改变html的标签
<html>
<head>
<meta charset="UTF-8">
<title>改变html中的标签</title>
</head>
<body>
<p id="word">123456789</p>
<ul>
<li class="change">你好</li>
<li>我好</li>
<li>大家好</li>
<li>真的好</li>
</ul>
</body>
</html>
1.1.1 在mainstoryborad中新建一个webView，如图
创建webView
1.1.2
#import "ViewController.h"
@interface ViewController ()<UIWebViewDelegate,UIPickerViewDelegate,UINavigationControllerDelegate>
@property (weak, nonatomic) IBOutlet UIWebView *webView;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// 1.增删改查 index.html
NSURL *url = [[NSBundle mainBundle] URLForResource:@"index" withExtension:@"html"];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
[self.webView loadRequest:request];
实现代理方法
// 1.增删改查 index.html
#pragma mark - **************** 1.改变html中的字符串
- (void)webViewDidFinishLoad:(UIWebView *)webView{
// 删除
NSString *remove = @"var word = document.getElementById('word');";
NSString *removeFinal = @"word.remove();";
[webView stringByEvaluatingJavaScriptFromString:remove];
[webView stringByEvaluatingJavaScriptFromString:removeFinal];
// 更改
NSString *change = @"var change = document.getElementsByClassName('change')[0];" "change.innerHTML = '改变了';";
[webView stringByEvaluatingJavaScriptFromString:change];
// 插入
NSString *insert = @"var img = document.createElement('img');"
"img.src = 'IMG_0001.JPG';"
"img.width = '80';"
"img.height = '180';"
"document.body.appendChild(img);";
[webView stringByEvaluatingJavaScriptFromString:insert];
}
1.1.3 改变前后的效果图
原加载的html
用oc修改后的html
二、改变网页中标签
2.1 新建xianhua.html
暂时不适用本地html，在viewDidload中添加代码
// 2.加载网页 网页版手机鲜花网 改变网页中标签
NSURL *url = [NSURL URLWithString:@"http://www.xianhua.cn/m/?u=318719"];
// NSURL *url = [[NSBundle mainBundle] URLForResource:@"xianhua" withExtension:@"html"];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
[self.webView loadRequest:request];
self.webView.backgroundColor = [UIColor grayColor];
2.1.2加载效果如图
原网页加载效果
2.2.1 遵循代理，修改原网页标签
// 2.加载网页 网页版手机鲜花网 改变网页中标签
#pragma mark - **************** 2.操作网页 --手机鲜花网
- (void)webViewDidFinishLoad:(UIWebView *)webView{
NSString *str1 = @"var h1 = document.getElementsByTagName('h1')[0];"
"h1.innerHTML='我把它改了哦';";
[webView stringByEvaluatingJavaScriptFromString:str1];
NSString *str3 = @"document.body.outerHTML";
NSString *html = [webView stringByEvaluatingJavaScriptFromString:str3];
NSLog(@"html======%@",html);
}
2.2.2 修改后的效果如图
修改后的效果
2.2.3 将打印的html复制到xianhua.html中
打印的html
2.3.1 将加载方式换成加载本地html
- (void)viewDidLoad {
[super viewDidLoad];
// 2.加载网页 网页版手机鲜花网 改变网页中标签
// NSURL *url = [NSURL URLWithString:@"http://www.xianhua.cn/m/?u=318719"];
NSURL *url = [[NSBundle mainBundle] URLForResource:@"xianhua" withExtension:@"html"];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
[self.webView loadRequest:request];
self.webView.backgroundColor = [UIColor grayColor];
}
2.3.2从本地加载html的效果
本地加载xianhua.html
三、访问系统相册
3.1.1新建本地html
<html>
<head>
<meta charset="UTF-8">
</head>
<body>
<button onclick="getImage()">访问相册</button>
<script>
function getImage(){
<!-- alert(0);-->
window.location.href = '123://image';
}
</script>
</body>
</html>
3.1.2加载本地html
- (void)viewDidLoad {
[super viewDidLoad];
// 3.访问系统相册
NSURL *url = [[NSBundle mainBundle] URLForResource:@"interviewImg" withExtension:@"html"];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
[self.webView loadRequest:request];
self.webView.backgroundColor = [UIColor grayColor];
}
3.1.3遵循代理，调用相册
// 3.访问系统相册
#pragma mark - **************** 3.访问系统相册
- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType{
NSString *str = request.URL.absoluteString;
NSRange range = [str rangeOfString:@"123://"]; // 注意用http会出现尾缀多/的问题
if (range.location != NSNotFound) {
NSString *method = [str substringFromIndex:range.location+range.length];
NSLog(@"method ======= %@",method);
SEL sel = NSSelectorFromString(method);
[self performSelector:sel];
}
NSLog(@"str ====== %@",str);
return YES;
}
- (void)image{
UIImagePickerController *pickerController = [[UIImagePickerController alloc] init];
pickerController.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
[self presentViewController:pickerController animated:YES completion:nil];
}
3.2 效果如图
调用系统相册
四、拿到html中input的值
4.1 新建userMessage.html
<html>
<head>
<meta charset="UTF-8">
</head>
<body>
<p></p>
<span>用户名</span>
<input id="userName">
<p></p>
<span>密码</span>
<input id="pwd" type="password">
<p></p>
<button id="btn">登录</button>
<script>
var userName = document.getElementById('userName');
var pwd = document.getElementById('pwd');
var btn = document.getElementById('btn');
<!-- function getMessage(){-->
<!-- var name = userName.value;-->
<!-- var password = pwd.value;-->
<!-- -->
<!-- window.location.href='123://'+name+'?'+password;-->
<!--<!-- alert(0);--> // 此行注释了-->
<!-- }-->
btn.onclick = function(){
var name = userName.value;
var password = pwd.value;
window.location.href='123://'+name+'?'+password;
}
</script>
</body>
</html>
4.2 加载本地userMessage.html
- (void)viewDidLoad {
[super viewDidLoad];
// 4.拿到用户名和密码
NSURL *url = [[NSBundle mainBundle] URLForResource:@"userMessage" withExtension:@"html"];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
[self.webView loadRequest:request];
self.webView.backgroundColor = [UIColor grayColor];
}
4.3 效果如图
加载html页面
4.4 遵循代理，拿到html中input的值
// 4.拿到用户名和密码
#pragma mark - **************** 拿到用户名和密码
-(BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType{
NSString *str = request.URL.absoluteString;
NSRange range = [str rangeOfString:@"123://"];
// NSLog(@"str ===== %@",str);
if (range.location != NSNotFound) {
NSString *method = [str substringFromIndex:range.location+range.length];
NSLog(@"method ====== %@",method);
}
return YES;
}
4.5 拿到用户名和密码，并输出打印结果
输出的打印结果
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