最近做资料文件下载下来并查看的时候，用 WKWebView 打开office 类型的文件的时候是没问题的，但是打开测试人员上传的一个 TXT/PDF 文件就出现了乱码问题，经过查看，应该是文件的编码问题，于是找了两种方式来解决出现的问题。
1、转成二进制文件
- (void)loadURL:(NSURL *)pageURL {
NSString *fileType = [[pageURL lastPathComponent] lowercaseString];
if ([fileType hasSuffix:@".txt"]) {
NSData *data = [NSData dataWithContentsOfURL:pageURL];
[self.webView loadData:data MIMEType:@"text/html" textEncodingName:@"GBK" baseURL:nil];
} else if ([fileType hasSuffix:@".pdf"]){
NSData *data = [NSData dataWithContentsOfURL:pageURL];
[self.webView loadData:data MIMEType:@"application/pdf" textEncodingName:@"GBK" baseURL:nil];
} else {
[self.webView loadRequest:[NSURLRequest requestWithURL:pageURL]];
}
}
官方文档对这个方法的解释:
一个WKNavigation对象包含信息跟踪加载一个网页的进展。
A WKNavigation object contains information for tracking the loading progress of a webpage.
导航web视图加载方法返回的对象,也是传递到导航委托方法来唯一地标识一个网页加载从开始到结束。它没有自己的方法或属性。
A navigation object is returned from the web view load methods and is also passed to the navigation delegate methods to uniquely identify a webpage load from start to finish. It has no method or properties of its own.
2、对文件进行转码
NSString *lastName =[[_webUrlStr lastPathComponent] lowercaseString];
if ([lastName containsString:@".txt"]) {
///编码可以解决 .txt 中文显示乱码问题
NSStringEncoding *useEncodeing = nil;
//带编码头的如utf-8等，这里会识别出来
NSString *body = [NSString stringWithContentsOfFile:_webUrlStr usedEncoding:useEncodeing error:nil];
//识别不到，按GBK编码再解码一次.这里不能先按GB18030解码，否则会出现整个文档无换行bug。
if (!body) {
body = [NSString stringWithContentsOfFile:_webUrlStr encoding:0x80000632 error:nil];
}
//还是识别不到，按GB18030编码再解码一次.
if (!body) {
body = [NSString stringWithContentsOfFile:_webUrlStr encoding:0x80000631 error:nil];
}
//展现
if (body) {
NSString* responseStr = [NSString stringWithFormat:
@"<HTML>"
"<head>"
"<title>Text View</title>"
"</head>"
"<BODY>"
"<pre>"
"%@"
"</pre>"
"</BODY>"
"</HTML>",
body];
[self.webView loadHTMLString:responseStr baseURL:nil];
}else {
NSString *urlString = [[NSBundle mainBundle] pathForAuxiliaryExecutable:_webUrlStr];
urlString = [urlString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSURL *requestUrl = [NSURL URLWithString:urlString];
NSURLRequest *request = [NSURLRequest requestWithURL:requestUrl];
[self.webView loadRequest:request];
}
}
