[IOS]UIWebView请求网络页面或者加载本地资源页面

#import <UIKit/UIKit.h>  @interface DXWViewController : UIViewController<UIWebViewDelegate> @property (retain, nonatomic) IBOutlet UIWebView *webview; @property(nonatomic,retain) UIAlertView *alert; @end

ViewController.m:

#import "DXWViewController.h"  @interface DXWViewController ()  @end  @implementation DXWViewController  - (void)viewDidLoad {     [super viewDidLoad]; 	NSURL *url = [NSURL URLWithString:@"http://www.baidu.com"];     NSURLRequest *request = [NSURLRequest requestWithURL:url];     //[self.webview loadRequest:request];          //加载本地资源,html页面     NSString *str = [[NSBundle mainBundle] pathForResource:@"百度图片—全球最大中文图片库" ofType:@"html"];          str = [NSString stringWithContentsOfFile:str encoding:NSUTF8StringEncoding error:nil];     NSLog(@"%@",str);     [self.webview loadHTMLString:str baseURL:[[NSBundle mainBundle] bundleURL]]; }  - (void)didReceiveMemoryWarning {     [super didReceiveMemoryWarning];     // Dispose of any resources that can be recreated. }  - (void)dealloc {     [_webview release];     [_alert release];     [super dealloc]; }  -(void)webViewDidFinishLoad:(UIWebView *)webView {     [self.alert dismissWithClickedButtonIndex:0 animated:YES]; }  -(void)webViewDidStartLoad:(UIWebView *)webView {     self.alert = [[UIAlertView alloc] initWithTitle:@"Loading..." message:nil delegate:nil cancelButtonTitle:nil otherButtonTitles:nil];     [self.alert show];          UIActivityIndicatorView *aiv = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];     aiv.center = CGPointMake(self.alert.bounds.size.width/2, self.alert.bounds.size.height/2);     [aiv startAnimating];     [self.alert addSubview:aiv]; }  @end