UIWebView加载时如何实现UIActivityIndi??catorView？ (iPhone O

webview加载文件本地,所以它加载非常快,但是当它加载外部页面它加载缓慢,我需要指示符…

FirstViewController.h

#import <UIKit/UIKit.h>

 @interface FirstViewController : 
 UIViewController <UIWebViewDelegate>{
    IBOutlet UIWebView *webview1;   
    NSURL *urlLocation;     
    IBOutlet UIActivityIndicatorView *m_activity; 
 }

 @property (nonatomic,retain) UIActivityIndicatorView *m_activity;

 - (IBAction)searchbutton:(id)sender;
 - (IBAction)home:(id)sender;

 @end

FirstViewController.m

#import "FirstViewController.h"

 @implementation FirstViewController


 @synthesize m_activity;

 // viewWillAppear loads every time younopen up this View

 - (void)viewWillAppear:(BOOL)animated {
   NSString *filePath = [[NSBundle mainBundle] pathForResource:@"index" ofType:@"html"];          
   urlLocation = [NSURL fileURLWithPath:filePath];  
   [webview1 loadRequest:[NSURLRequest requestWithURL:urlLocation]]; 
 }




 - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {     
  if (self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]) {      
     //Initialization code      
     m_activity = nil;  
   }    
   return self; 
 }

 - (void)webViewDidFinishLoad:(UIWebView *)webView {    
   m_activity.hidden= TRUE;     
   [m_activity stopAnimating];  
   NSLog(@"Web View started loading...");
 }

 - (void)webViewDidStartLoad:(UIWebView *)webView {     
   m_activity.hidden= FALSE;    
   [m_activity startAnimating];     
   NSLog(@"Web View Did finish loading");
 }