与webView进行交互,webView小记

哈士奇的罪恶 · 发表于 2019-3-6 15:51:48

一、与webView进行交互，调用web页面中的需要传参的函数时，参数需要带单引号，或者双引号（双引号需要进行转义在转义字符前加\）,在传递json字符串时不需要加单引号或双引号。

-(void)webViewDidFinishLoad:(UIWebView *)webView
{
NSString *sendJsStr=[NSString stringWithFormat:@"openFile(\"%@\")",jsDocPathStr];
[webView stringByEvaluatingJavaScriptFromString:sendJsStr];
}

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2、在该代理方法中判断与webView的交互，可通过html里定义的协议实现

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

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3、只有在webView加载完毕之后在能够调用对应页面中的js方法。（对应方法如第一条）

4、为webView添加背景图片

approvalWebView.backgroundColor=[UIColor clearColor];
approvalWebView.opaque=NO;//这句话很重要，webView是否是不透明的，no为透明
//在webView下添加个imageView展示图片就可以了

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5、获取webView页面内容信息

NSString *docStr=[webView stringByEvaluatingJavaScriptFromString:@"document.documentElement.textContent"];//获取web页面内容信息，此处获取的是个json字符串
SBJsonParser *parserJson=[[[SBJsonParser alloc]init]autorelease];
NSDictionary *contentDic=[parserJson objectWithString:docStr];//将json字符串转化为字典

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6、加载本地文件的方法

第一种方法：
NSString* path = [[NSBundle mainBundle] pathForResource:name ofType:@"html" inDirectory:@"mobile"];//mobile是根目录，name是文件名称，html是文件类型
[webView loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath:path]]]; //加载本地文件
第二种方法：
NSString *resourcePath = [[NSBundle mainBundle] resourcePath];
NSString *filePath = [resourcePath stringByAppendingPathComponent:@"mobile.html"];
NSString *htmlstring=[[NSString alloc] initWithContentsOfFile:filePath encoding:NSUTF8StringEncoding error:nil];
[uiwebview loadHTMLString:htmlstring baseURL:[NSURL fileURLWithPath:[[NSBundle mainBundle] bundlePath]]];

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7、将文件下载到本地址然后再用webView打开

NSString *resourceDocPath = [[NSString alloc] initWithString:[[[[NSBundle mainBundle] resourcePath] stringByDeletingLastPathComponent] stringByAppendingPathComponent:@"Documents"]];
self.filePath = [resourceDocPath stringByAppendingPathComponent:[NSString stringWithFormat:@"maydoc%@",docType]];
NSData *attachmentData = [[NSData alloc] initWithContentsOfURL:[NSURL URLWithString:theUrl]];
[attachmentData writeToFile:filePath atomically:YES];
NSURL *url = [NSURL fileURLWithPath:filePath];
NSURLRequest *requestObj = [NSURLRequest requestWithURL:url];
[attachmentWebView loadRequest:requestObj];
//删除指定目录下的文件
NSFileManager *magngerDoc=[NSFileManager defaultManager];
[magngerDoc removeItemAtPath:filePath error:nil];

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8、处理webView展示txt文档乱码问题

if ([theType isEqualToString:@".txt"])
{
//txt分带编码和不带编码两种，带编码的如UTF-8格式txt，不带编码的如ANSI格式txt
//不带的，可以依次尝试GBK和GB18030编码
NSString* aStr = [[NSString alloc] initWithData:attachmentData encoding:NSUTF8StringEncoding];
if (!aStr)
{
//用GBK进行编码
aStr=[[NSString alloc] initWithData:attachmentData encoding:0x80000632];
}
if (!aStr)
{
//用GBK编码不行,再用GB18030编码
aStr=[[NSString alloc] initWithData:attachmentData encoding:0x80000631];
}
//通过html语言进行排版
NSString* responseStr = [NSString stringWithFormat:
@"<HTML>"
"<head>"
"<title>Text View</title>"
"</head>"
"<BODY>"
"<pre>"
"%@"
"/pre>"
"</BODY>"
"</HTML>",
aStr];
[attachmentWebView loadHTMLString:responseStr baseURL:[NSURL fileURLWithPath:[[NSBundle mainBundle] bundlePath]]];
return;
}

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9 、使用webView加载本地或网络文件整个流程

1、 Loading a local PDF file into the web view
- (void)viewDidLoad {
[super viewDidLoad];
//从本地加载
NSString *thePath = [[NSBundle mainBundle] pathForResource:@"iPhone_User_Guide" ofType:@"pdf"];
if (thePath) {
NSData *pdfData = [NSData dataWithContentsOfFile:thePath];
[(UIWebView *)self.view loadData:pdfData MIMEType:@"application/pdf"
textEncodingName:@"utf-8" baseURL:nil];
}
//从网络加载
[self.myWebView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@"http://www.apple.com/"]]];
}
2、The web-view delegate managing network loading
- (void)webViewDidStartLoad:(UIWebView *)webView
{
// starting the load, show the activity indicator in the status bar
[UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
}
- (void)webViewDidFinishLoad:(UIWebView *)webView
{
// finished loading, hide the activity indicator in the status bar
[UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
}
- (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error
{
// load error, hide the activity indicator in the status bar
[UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
// report the error inside the webview
NSString* errorString = [NSString stringWithFormat:
@"<html><center><font size=+5 color='red'>An error occurred:<br>%@</font></center></html>",
error.localizedDescription];
[self.myWebView loadHTMLString:errorString baseURL:nil];
}
3、Stopping a load request when the web view is to disappear
- (void)viewWillDisappear:(BOOL)animated
{
if ( [self.myWebView loading] ) {
[self.myWebView stopLoading];
}
self.myWebView.delegate = nil; // disconnect the delegate as the webview is hidden
[UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
}
/************/
引用自苹果官方文档（displaying web content）

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10、查找webView中的scrollview

- (void) addScrollViewListener
{
UIScrollView* currentScrollView;
for (UIView* subView in self.webView.subviews) {
if ([subView isKindOfClass:[UIScrollView class]]) {
currentScrollView = (UIScrollView*)subView;
currentScrollView.delegate = self;
}
}
}

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11、去掉webView的阴影，做成类似scrollView

- (void)clearBackgroundWithColor:(UIColor*)color
{
// 去掉webview的阴影
self.backgroundColor = color;
for (UIView* subView in [self subviews])
{
if ([subView isKindOfClass:[UIScrollView class]]) {
for (UIView* shadowView in [subView subviews])
{
if ([shadowView isKindOfClass:[UIImageView class]]) {
[shadowView setHidden:YES];
}
}
}
}
}

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12、取消长按webView上的链接弹出actionSheet的问题

-(void)webViewDidFinishLoad:(UIWebView *)webView
{
[webView stringByEvaluatingJavaScriptFromString:@"document.documentElement.style.webkitTouchCallout = 'none';"];
}

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与webView进行交互,webView小记

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