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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

🦑Hold down control + command + up arrow key, switch to ViewController.m file, this is what we type in the file-(void) webView, you can see the following implementation method:

4) UIWebView mainly has the following delegate methods:

1.- (void) webViewDidStartLoad: (UIWebView *) webView; execute this method when loading starts.
2.- (void) webViewDidFinishLoad: (UIWebView *) webView; execute this method when loading is completed.
3.- (void) webView: (UIWebView *) webView didFailLoadWithError: (NSError *) error; execute this method when loading error.

We can place activityIndicatorView into the first two delegate methods.

> code -(void) webViewDidStartLoad: (UIWebView *) webView
{
[activityIndicatorView startAnimating];
}
-(void) webViewDidFinishLoad: (UIWebView *) webView
{
[activityIndicatorView stopAnimating];
}

🦑The buttonPress method is very simple, just call the
loadWebPageWithString method that we started to define:
Copy codecode show as below:

-(IBAction) buttonPress: (id) sender
{
[textField resignFirstResponder];
[self loadWebPageWithString: textField.text];