我的应用程序中有一个UIWebView,我想用它来显示一个链接到另一个URL的图像。
我正在使用
<img src="image.jpg" /> to load the image.
问题是图像没有加载(即无法找到),即使它已作为资源添加到我的项目中并被复制到包中。
我已尝试使用NSBundle获取图像的完整路径并使用它,但它仍未显示在Web视图中。
有什么想法吗?
答案 0 :(得分:288)
使用相对路径或文件:引用图像的路径不适用于UIWebView。相反,您必须使用正确的baseURL将HTML加载到视图中:
NSString *path = [[NSBundle mainBundle] bundlePath];
NSURL *baseURL = [NSURL fileURLWithPath:path];
[webView loadHTMLString:htmlString baseURL:baseURL];
然后您可以像这样参考您的图片:
<img src="myimage.png">
答案 1 :(得分:46)
使用此:
[webView loadHTMLString:htmlString baseURL:[[NSBundle mainBundle] bundleURL]];
答案 2 :(得分:24)
我也遇到了这个问题。在我的情况下,我正在处理一些未本地化的图像和其他用于多种语言的图像。基本URL没有为我获取本地化文件夹中的图像。我通过以下方式解决了这个问题:
// make sure you have the image name and extension (for demo purposes, I'm using "myImage" and "png" for the file "myImage.png", which may or may not be localized)
NSString *imageFileName = @"myImage";
NSString *imageFileExtension = @"png";
// load the path of the image in the main bundle (this gets the full local path to the image you need, including if it is localized and if you have a @2x version)
NSString *imagePath = [[NSBundle mainBundle] pathForResource:imageFileName ofType:imageFileExtension];
// generate the html tag for the image (don't forget to use file:// for local paths)
NSString *imgHTMLTag = [NSString stringWithFormat:@"<img src=\"file://%@\" />", imagePath];
然后,在加载内容时,在UIWebView HTML代码中使用imgHTMLTag。
我希望这可以帮助遇到同样问题的人。
答案 3 :(得分:6)
我有一个类似的问题,但所有建议都没有帮助。
然而,问题是* .png本身。 没有Alpha频道。不知何故 Xcode在部署过程中忽略所有没有alpha通道的png文件。
答案 4 :(得分:5)
尝试使用base64图像字符串。
NSData* data = UIImageJPEGRepresentation(image, 1.0f);
NSString *strEncoded = [data base64Encoding];
<img src='data:image/png;base64,%@ '/>,strEncoded
答案 5 :(得分:3)
您可以选择 将文件添加到&#34; MyProj&#34; ,将文件夹(例如带有子文件夹css,img和js以及文件test.html的WEB)添加到项目中并选择 创建文件夹参考 。现在,以下代码将关注所有引用的图像,css和javascript
NSString *filePath = [[NSBundle mainBundle] pathForResource:@"WEB/test.html" ofType:nil];
[webView loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath:filePath]]];
答案 6 :(得分:3)
在Swift 3中:
webView.loadHTMLString("<img src=\"myImg.jpg\">", baseURL: Bundle.main.bundleURL)
即使图像在没有任何修改的文件夹内,这对我也有用。
答案 7 :(得分:2)
在iOS 6 Programming Cookbok中阅读了几章后,开始学习objective-c和iOS编程,我想补充说,如果要从自定义加载资源 bundle并在Web视图中使用它,它可以这样完成:
NSString *resourcesBundlePath = [[NSBundle mainBundle] pathForResource:@"Resources" ofType:@"bundle"];
NSBundle *resourcesBundle = [NSBundle bundleWithPath:resourcesBundlePath];
[self.outletWebView loadHTMLString:[html description] baseURL:[resourcesBundle bundleURL]];
然后,在您的html中,您可以使用“自定义”包作为基本路径来引用资源:
body {
background-image:url('img/myBg.png');
}
答案 8 :(得分:1)
亚当亚历山大的快速版本目标C回答:
let logoImageURL = NSURL(fileURLWithPath: "\(Bundle.main.bundlePath)/PDF_HeaderImage.png")
答案 9 :(得分:0)
如果使用图像的相对链接,则图像不会显示,因为编译iOS应用程序后不会保留所有文件夹结构。您可以做的是将本地网站文件夹转换为包,而不是添加&#39; .bundle &#39;文件扩展名。
因此,如果您的本地网站包含在文件夹&#34; www &#34;中,则应将其重命名为&#34; www.bundle & #34 ;.这允许保留图像文件夹和目录结构。然后加载&#39; index.html &#39;使用&#39; baseURL &#39;将文件作为HTML字符串存入WebView (设置为www.bundle路径)以启用加载相对图像链接。
NSString *mainBundlePath = [[NSBundle mainBundle] resourcePath];
NSString *wwwBundlePath = [mainBundlePath stringByAppendingPathComponent:@"www.bundle"];
NSBundle *wwwBundle = [NSBundle bundleWithPath:wwwBundlePath];
if (wwwBundle != nil) {
NSURL *baseURL = [NSURL fileURLWithPath:[wwwBundle bundlePath]];
NSError *error = nil;
NSString *page = [[NSBundle mainBundle] pathForResource:@"index.html" ofType:nil];
NSString *pageSource = [NSString stringWithContentsOfFile:page encoding:NSUTF8StringEncoding error:&error];
[self.webView loadHTMLString:pageSource baseURL:baseURL];
}
答案 10 :(得分:0)
这些答案对我有帮助 - 特别是文件:\\ xxxxxxx.xxx,但我必须做一个解决方法来显示图像。
就我而言,我的服务器上有一个HTML文件,我将其下载到文档目录。我想用UIWebView中的本地图形显示它,我无法工作。这就是我的所作所为:
因此在启动时将文件复制到文档目录:
-(BOOL)copyBundleFilesToDocumentsDirectoryForFileName:(NSString *)fileNameToCopy OverwriteExisting:(BOOL)overwrite {
//GET DOCUMENTS DIR
//Search for standard documents using NSSearchPathForDirectoriesInDomains
//First Param = Searching the documents directory
//Second Param = Searching the Users directory and not the System
//Expand any tildes and identify home directories.
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDir = [paths objectAtIndex:0];
//COPY FILE FROM NSBUNDLE File to Local Documents Dir
NSString *writableFilePath = [documentsDir stringByAppendingPathComponent:fileNameToCopy];
NSFileManager *fileManager = [NSFileManager defaultManager];
NSError *fileError;
DDLogVerbose(@"File Copy From Bundle to Documents Dir would go to this path: %@", writableFilePath);
if ([fileManager fileExistsAtPath:writableFilePath]) {
DDLogVerbose(@"File %@ already exists in Documents Dir", fileNameToCopy);
if (overwrite) {
[fileManager removeItemAtPath:writableFilePath error:nil];
DDLogVerbose(@"OLD File %@ was Deleted from Documents Dir Successfully", fileNameToCopy);
} else {
return (NO);
}
}
NSArray *fileNameParts = [fileNameToCopy componentsSeparatedByString:@"."];
NSString *bundlePath = [[NSBundle mainBundle]pathForResource:[fileNameParts objectAtIndex:0] ofType:[fileNameParts objectAtIndex:1]];
BOOL success = [fileManager copyItemAtPath:bundlePath toPath:writableFilePath error:&fileError];
if (success) {
DDLogVerbose(@"Copied %@ from Bundle to Documents Dir Successfully", fileNameToCopy);
} else {
DDLogError(@"File %@ could NOT be copied from bundle to Documents Dir due to error %@!!", fileNameToCopy, fileError);
}
return (success);
}
答案 11 :(得分:0)
迅捷版的Lithu T.V回答:
Navigation Bar
答案 12 :(得分:-7)
我的rss-feed(get in RSSItems)的复杂解决方案(或教程)仅适用于设备:
#define CACHE_DIR [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject]
for (RSSItem *item in _dataSource) {
url = [NSURL URLWithString:[item link]];
request = [NSMutableURLRequest requestWithURL:url];
[request setHTTPMethod:@"GET"];
[NSURLConnection sendAsynchronousRequest:request
queue:queue
completionHandler:^(NSURLResponse *response, NSData *data, NSError *error) {
@autoreleasepool {
if (!error) {
NSString *html = [[NSString alloc] initWithData:data
encoding:NSWindowsCP1251StringEncoding];
{
NSError *error = nil;
HTMLParser *parser = [[HTMLParser alloc] initWithString:html error:&error];
if (error) {
NSLog(@"Error: %@", error);
return;
}
HTMLNode *bodyNode = [parser body];
NSArray *spanNodes = [bodyNode findChildTags:@"div"];
for (HTMLNode *spanNode in spanNodes) {
if ([[spanNode getAttributeNamed:@"class"] isEqualToString:@"page"]) {
NSString *absStr = [[response URL] absoluteString];
for (RSSItem *anItem in _dataSource)
if ([absStr isEqualToString:[anItem link]]){
NSArray *spanNodes = [bodyNode findChildTags:@"img"];
for (HTMLNode *spanNode in spanNodes){
NSString *imgUrl = [spanNode getAttributeNamed:@"src"];
if (imgUrl){
[anItem setImage:imgUrl];
break;
}
}
[anItem setHtml:[spanNode rawContents]];
[self subProcessRSSItem:anItem];
}
}
}
[parser release];
}
if (error) {
NSLog(@"Error: %@", error);
return;
}
[[NSNotificationCenter defaultCenter] postNotificationName:notification_updateDatasource
object:self
userInfo:nil];
}else
NSLog(@"Error",[error userInfo]);
}
}];
和
- (void)subProcessRSSItem:(RSSItem*)item{
NSString *html = [item html];
if (html) {
html = [html stringByReplacingOccurrencesOfString:@"<div class=\"clear\"></div>"
withString:@""];
html = [html stringByReplacingOccurrencesOfString:@"<p class=\"link\">"
withString:@""];
html = [html stringByReplacingOccurrencesOfString:@"<div class=\"page\">"
withString:@""];
html = [html stringByReplacingOccurrencesOfString:@"</div>"
withString:@""];
NSArray *array1 = [html componentsSeparatedByString:@"<a"];
if ([array1 count]==2) {
NSArray *array2 = [html componentsSeparatedByString:@"a>"];
html = [[array1 objectAtIndex:0] stringByAppendingString:[array2 objectAtIndex:1]];
}
NSURL *url;
NSString *fileName;
NSString *filePath;
BOOL success;
if ([item image]) {
url = [NSURL URLWithString:
[hostString stringByAppendingString:[item image]]];
NSData *imageData = [NSData dataWithContentsOfURL:url];
fileName = [[[url relativePath] componentsSeparatedByString:@"/"] lastObject];
filePath = [NSString stringWithFormat:@"%@/%@",
CACHE_DIR,
fileName];
//save image locally
success = [[NSFileManager defaultManager] createFileAtPath:filePath
contents:imageData
attributes:nil];
//replace links
html = [html stringByReplacingOccurrencesOfString:[item image]
withString:filePath];
[item setImage:fileName];
//Передадим обновление интерфейса, снабдив индексом обновляемой ячейки
[[NSNotificationCenter defaultCenter] postNotificationName:notification_updateRow
object:self
userInfo:[NSDictionary dictionaryWithObject:@([_dataSource indexOfObject:item])
forKey:@"row"]];
}
//finalize html
html = [NSString stringWithFormat:@"<html><body>%@</body></html>",html];
fileName = [[[item link] componentsSeparatedByString:@"/"] lastObject];
filePath = [NSString stringWithFormat:@"%@/%@",
CACHE_DIR,
fileName];
success = [[NSFileManager defaultManager] createFileAtPath:filePath
contents:[html dataUsingEncoding:NSUTF8StringEncoding]
attributes:nil];
[item setHtml:
(success)?filePath:nil];//for direct download in other case
}
}
视图控制器上的
- (void)viewDidAppear:(BOOL)animated{
RSSItem *item = [[DataSingleton sharedSingleton] selectedRSSItem];
NSString* htmlString = [NSString stringWithContentsOfFile:[item html]
encoding:NSUTF8StringEncoding error:nil];
NSURL *baseURL = [NSURL URLWithString:CACHE_DIR];
[_webView loadHTMLString:htmlString
baseURL:baseURL];
}
rss item class
#import <Foundation/Foundation.h>
@interface RSSItem : NSObject
@property(nonatomic,retain) NSString *title;
@property(nonatomic,retain) NSString *link;
@property(nonatomic,retain) NSString *guid;
@property(nonatomic,retain) NSString *category;
@property(nonatomic,retain) NSString *description;
@property(nonatomic,retain) NSString *pubDate;
@property(nonatomic,retain) NSString *html;
@property(nonatomic,retain) NSString *image;
@end
任何带图片的html的一部分
<html><body>
<h2>blah-blahTC One Tab 7</h2>
<p>blah-blah НТС One.</p>
<p><img width="600" height="412" alt="" src="/Users/wins/Library/Application Support/iPhone Simulator/5.0/Applications/2EAD8889-6482-48D4-80A7-9CCFD567123B/Library/Caches/htc-one-tab-7-concept-1(1).jpg"><br><br>
blah-blah (Hasan Kaymak) blah-blah HTC One Tab 7, blah-blah HTC One. <br><br>
blah-blah
microSD.<br><br>
blah-blah Wi-Fi to 4G LTE.</p>
</p>
</body></html>
保存名称的图片 htc-one-tab-7-concept-1(1).jpg