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🦑Introduction to the basic usage of WebView in iOS development

1) Use UIWebView to load a webpage to
run XCode 4.3, create a new Single View Application, and name it WebViewDemo.

2) Load WebView,
add WebView member variable in ViewController.h and add implementation in ViewController.m

> #import <UIKit / UIKit.h>
@interface ViewController: UIViewController
{
UIWebView * webView;
}
@end
ViewController.m-
(void) viewDidLoad
{
[super viewDidLoad];
webView = [[UIWebView alloc] initWithFrame: CGRectMake (0, 0, 320, 480)];
NSURLRequest * request = [NSURLRequest requestWithURL: [NSURL URLWithString: @ "http://www.baidu.com"]];
[self.view addSubview: webView];
[webView loadRequest: request];
}

🦑Run so that the Baidu web page opens-or google.com

🦑The network environment of the mobile phone changes in real time.

When the network is slow, how to prompt the user that the webpage is opening? How to prompt the user when there is an error opening the webpage? At this time, we need to know when the web page opens,
when it loads, and when something goes wrong. Then we need to implement this <UIWebViewDelegate> protocol

3) Implement the protocol and modify it in ViewController.h as follows:

> code :

#import <UIKit / UIKit.h>

@interface ViewController: UIViewController <UIWebViewDelegate>
{
UIWebView * webView;
}
@end