我有一个uiwebview在我的应用程序，显示服务器上承载的HTML文件的数量。如果没有互联网连接，我还想要显示将显示的html文件的本地副本，但我不知道如何执行此操作。我有的.m文件与下面类似。如何加载本地HTML文件，如果没有互联网连接

目前uiwebview将显示远程托管的网页(以下“contact.html”的例子。有没有人能够解释，如果没有可用的互联网我如何加载该文件的本地副本？

#import "ContactMeViewController.h"

@interface ContactMeViewController()

@end

@implementation ContactMeViewController

- (void)viewDidLoad

{

NSString *urlAddress = @"http://www.domain.co.nz/apppages/contact.html";

//Create a URL object.

NSURL *url = [NSURL URLWithString:urlAddress];

//URL Request Object

NSURLRequest *requestObj = [NSURLRequest requestWithURL:url];

//Load the request in the UIWebView.

[webview loadRequest:requestObj];

webview.scalesPageToFit = YES;

}

- (void)viewDidUnload

{

[super viewDidUnload];

// Release any retained subviews of the main view.

// e.g. self.myOutlet = nil;

}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation

{

return (interfaceOrientation == UIInterfaceOrientationPortrait);

}

@end

我已经更新了.m文件如下，却得到了一个空白的屏幕，没有互联网连接，而不是本地文件加载：

#import "ContactMeViewController.h"

@interface ContactMeViewController (UIWebViewDelegate)

@end

@implementation ContactMeViewController

- (void)viewDidLoad

{

NSString *urlAddress = @"http://www.kuranimarsters.co.nz/apppages/contact.html";

//Create a URL object.

NSURL *url = [NSURL URLWithString:urlAddress];

//URL Request Object

NSURLRequest *requestObj = [NSURLRequest requestWithURL:url];

//Load the request in the UIWebView.

[webview loadRequest:requestObj];

webview.scalesPageToFit = YES;

}

-(void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error {

if (-1009 == kCFURLErrorNotConnectedToInternet) {

// if we can identify the error i.e, no internet connection

[self loadHtmlFile];

}

}

-(void)loadHtmlFile

{

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

NSString *documentsDirectory = [paths objectAtIndex:0];

NSString *filePath = [documentsDirectory stringByAppendingPathComponent:@"contact.html"];

NSString *content = [NSString stringWithContentsOfFile:filePath encoding:NSUTF8StringEncoding error:NULL];

NSString* htmlString = [NSString stringWithContentsOfFile:content encoding:NSUTF8StringEncoding error:nil];

[webview loadHTMLString:htmlString baseURL:nil];

}

- (void)viewDidUnload

{

[super viewDidUnload];

// Release any retained subviews of the main view.

// e.g. self.myOutlet = nil;

}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation

{

return (interfaceOrientation == UIInterfaceOrientationPortrait);

}

@end

2015-03-25

KGNZ

+0

使用委托，当错误出现，加载本地HTML网页... –

2015-03-25 06:39:27

+0

您可以尝试https://github.com/rnapier/RNCachingURLProtocol –

2015-03-25 06:42:14