UIWebView及加载loading界面

#import <UIKit/UIKit.h>

@interface MainViewController : UIViewController

{

    UIWebView *webView;

}

#import "MainViewController.h"

@interface MainViewController ()<UIWebViewDelegate>

@end

@implementation MainViewController

- (void)viewDidLoad {

    [superviewDidLoad];

    // Do any additional setup after loading the view.

    

    //创建webView

    webView = [[UIWebViewalloc] initWithFrame:CGRectMake(0,0, 375,550)];

    webView.delegate =self;

    NSURLRequest *request = [NSURLRequestrequestWithURL:[NSURLURLWithString:@"http://www.baidu.com"]];

    [self.viewaddSubview:webView];

    [webView loadRequest:request];

    

}

    //网页开始加载的时候调用

- (void )webViewDidStartLoad:(UIWebView  *)webView

{

    UIView *view = [[UIViewalloc] initWithFrame:CGRectMake(0,0, 375, 550)];

    [view setTag:108];

    [view setBackgroundColor:[UIColorblackColor]];

    [view setAlpha:0.5];

    [self.viewaddSubview:view];

    

    //loading界面

    UIActivityIndicatorView *activityIndicator = [[UIActivityIndicatorViewalloc]initWithFrame:CGRectMake(0,0, 32,32)];

    [activityIndicator setCenter:view.center];

    [activityIndicator setActivityIndicatorViewStyle:UIActivityIndicatorViewStyleWhite];

    [view addSubview:activityIndicator];

    

    [activityIndicator startAnimating];

    

}

    //网页加载完成的时候调用

- (void )webViewDidFinishLoad:(UIWebView  *)webView

{

     UIActivityIndicatorView *activityIndicator = [[UIActivityIndicatorViewalloc]initWithFrame:CGRectMake(0,0, 32,32)];

    [activityIndicator stopAnimating];

    UIView *view = (UIView *)[self.viewviewWithTag:108];

    [view removeFromSuperview];

    

}

    //网页加载失败的时候调用

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

{

    UIActivityIndicatorView *activityIndicator = [[UIActivityIndicatorViewalloc]initWithFrame:CGRectMake(0,0, 32,32)];

    [activityIndicator stopAnimating];

    UIView *view = (UIView *)[self.viewviewWithTag:108];

    [view removeFromSuperview];

}