xcode 4.6 使用NSURLConnection 获取网页内容(iOS6.1,纯手工编码,无xib,无storyboard)

环境 iOS   6.1, xcode 4.6


一、创建新项目


1、打开 xcode,File --> New --> Project... -->Empty Application

2、项目名称 NSURLConnectionDemo,下面所有选项全部不选,完成创建。


二、创建视图控制器


3、File-->New-->File-->Objective-C class

4、创建UIViewController的子类,命名 TestViewController


三、创建视图控制器实例


5、在 AppDelegate.m中引入 

#import "TestViewController.h"

6、添加TestViewController到窗体

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions

{

    self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];

    TestViewController *rootController = [[TestViewController alloc]init];

    self.window.rootViewController = rootController;

    self.window.backgroundColor = [UIColor whiteColor];

    [self.window makeKeyAndVisible];

    [rootController release];

    return YES;

}


7、在TestViewController.h 中添加两个变量

@interface TestViewController : UIViewController{

    NSMutableData * pageData ;

    UIWebView *webView;

}


8、在TestViewController.m 中添加按钮和 UIWebView

- (void)viewDidLoad

{

    [super viewDidLoad];

// Do any additional setup after loading the view.

    UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];

    [self.view addSubview:button];

    [button setTitle:@"start" forState:UIControlStateNormal];

    [button setFrame:CGRectMake(10,20, 300, 40)];

    [button addTarget:self action:@selector(openUrl) forControlEvents:UIControlEventTouchUpInside];

    

     webView = [[UIWebView alloc] initWithFrame:CGRectMake(0, 50, 320, 400)];

    [webView setUserInteractionEnabled:NO];

    [webView setBackgroundColor:[UIColor clearColor]];

    [webView setOpaque:NO];

    

    

    [self.view addSubview:webView];

}


9、实现按钮点击的事件

-(void)openUrl

{


    NSURL *url = [NSURL URLWithString:@"http://www.baidu.com"];

    NSMutableURLRequest *request = [[NSMutableURLRequest alloc ]initWithURL:url cachePolicy:NSURLRequestReloadIgnoringLocalCacheData timeoutInterval:60];

    pageData = [[NSMutableData alloc]init];

    [request setHTTPMethod:@"GET"];

    [request addValue:@"text/html" forHTTPHeaderField:@"Content-Type"];

    NSURLConnection *conn = [[NSURLConnection alloc]initWithRequest:request delegate:self];

    [request release];

    [conn release];

}


10、实现 NSURLConnection 代理的两个方法

- (void)connection:(NSURLConnection *)aConn didReceiveData:(NSData *)data {

[pageData appendData:data];

}


- (void)connectionDidFinishLoading:(NSURLConnection *)aConn {

    NSString *results = [[NSString alloc] initWithData:pageData encoding:NSUTF8StringEncoding];

[webView loadHTMLString:results baseURL:nil];

    

}


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