我遇到过很多方法从本地html文件加载和重新加载UIWebView的内容,但似乎我不断回来的问题。
在我的项目中,我有一个webView,可以动态加载从我在XCode项目中的50个不同HTML文件之一中提取的HTML内容。 根据用户之前在viewController上按下的按钮,使用不同的HTML文件重新加载webView的内容。大多数时候一切正常,但在调用webViewDidFinishLoad委托方法之后,webView将只显示“(null)”。
我不明白发生了什么,当我在这个viewController上来回转换并重新加载webView时,HTML内容最终会在同一个HTML文件中正确显示。
以下是在webView中加载HTML的代码(从viewWillAppear
方法调用):
- (void) reloadWebViewFromLocalFile{
// Reset the UIWebView
[self.contentWebView removeFromSuperview];
self.contentWebView = nil;
self.contentWebView = [[UIWebView alloc] initWithFrame:CGRectMake(0, 0, 320, 1)];
[self.contentWebView setContentMode:UIViewContentModeScaleAspectFit];
[self.contentWebView setDelegate:self];
[self.contentScrollView addSubview:self.contentWebView];
[self.contentWebView release];
NSString *fileName = [[NSBundle mainBundle] pathForResource:[NSString stringWithFormat:@"%d.%d",self.currentIndexPath.section+1,self.currentIndexPath.row+1] ofType:@"html"];
NSString *CSSContent = [NSString stringWithFormat:@"<style type=\"text/css\">body{padding-left:8px;padding-right:8px;font-family:\"%@\";}p{text-align:justify;}img{max-width:300px;display:block; margin:auto;}strong{font-family:\"%@\";}h1{font-size:20;font-family:\"%@\"}h2{font-size:18;font-family:\"%@\"}h3{font-size:17;font-family:\"%@\"}</style><script type=\"text/javascript\">touchMove = function(event) {event.preventDefault();}</script>", FONT_STAG_BOOK, FONT_STAG_SEMIBOLD, FONT_STAG_SEMIBOLD, FONT_STAG_SEMIBOLD, FONT_STAG_SEMIBOLD];
self.HTMLString = [NSString stringWithFormat:@"<html><head>%@</head>%@</html>",CSSContent,[NSString stringWithUTF8String:[[NSData dataWithContentsOfFile:fileName] bytes]]];
[self.contentWebView loadHTMLString:self.HTMLString baseURL:[NSURL fileURLWithPath:[[NSBundle mainBundle] bundlePath]]];
}
这是webViewDidFinishLoad
委托方法:
- (void)webViewDidFinishLoad:(UIWebView *)webView{
NSString *stringContent = [self.contentWebView stringByEvaluatingJavaScriptFromString:@"document.body.innerHTML"];
float height = [[self.contentWebView stringByEvaluatingJavaScriptFromString:@"document.body.offsetHeight;"] floatValue] + 20;
[self.contentWebView setFrame:CGRectMake(0, 0, 320, height)];
[self.contentScrollView setContentSize:CGSizeMake(0, height+self.nextButton.frame.size.height)];
[self.nextButton setFrame:CGRectMake(0, height, 320, self.nextButton.frame.size.height)];
if ([self.contentWebView respondsToSelector:@selector(scrollView)]) {
self.contentWebView.scrollView.scrollEnabled = NO; // available starting in iOS 5
} else {
for (id subview in self.contentWebView .subviews)
if ([[subview class] isSubclassOfClass: [UIScrollView class]])
((UIScrollView *)subview).scrollEnabled = NO;
}
}
编辑:忘记复制粘贴在webView中实际加载HTML字符串的行
答案 0 :(得分:0)
问题似乎是使用bytes
函数,如果内容编码不准确,则该函数效果不佳......
[NSString stringWithUTF8String:[[NSData dataWithContentsOfFile:fileName] bytes]];
应该是
[[NSString alloc] initWithData:[NSData dataWithContentsOfFile:fileName] encoding:NSUTF8StringEncoding];