webViewDidFinishLoad因为网页里的重定向，会调用多次，使用web view.isLoading来解决

我编码如下，但我发现 webViewDidFinishLoad() 会发生若干次。
如何知道 webViewDidFinishLoad() 最后发生吗？
iNavigate = 0;

- (void)webViewDidFinishLoad:(UIWebView *)webView
{

iNavigate ++;

NSLog(@"Navigate Count = %d", iNavigate);

if (iNavigate >1)
{
CGRect rect = self.webView.frame;
rect.size.height = rect.size.height - toolBarBrowser.frame.size.height;
self.webView.frame = rect;
self.toolBarBrowser.hidden = FALSE;
}

barButtonBack.enabled = (self.webView.canGoBack);
barButtonForward.enabled = (self.webView.canGoForward);

}

//解决方法 1:
//您可以使用 (webview.isLoading) 来知道 UIWebView webViewDidFinishLoad 最后或发生不
- (void)webViewDidFinishLoad:(UIWebView *)webView{
if (!webView.isLoading){
[self ChickUrlIsDownload:myWebview.request.URL.absoluteString];
}
{
[progress setProgress:1 animated:YES];
[progress removeFromSuperview];
progress=nil;
}
if ([myWebview canGoBack]) {
[btn_back setSelected:YES];
}else{
[btn_back setSelected:NO];
}
[btn_back setEnabled:btn_back.selected];
if ([myWebview canGoForward]) {
[btn_go setSelected:YES];
}else{
[btn_go setSelected:NO];
}
[btn_go setEnabled:btn_go.selected];
//获取到title
NSString *title=[webView stringByEvaluatingJavaScriptFromString:@"document.title"];
if (title.length>16) {
sel_title=[NSString stringWithFormat:@"%@%@",[title substringWithRange:NSMakeRange(0,16)],@"..."];
}else{
sel_title=title;
}
NSLog(@"_str_title=%@",sel_title);
}