Xcode 4.6 uses nsurlconnection to obtain webpage content (ios6.1, manually encoded, no XIB, no storyboard)

Environment: IOS 6.1 and xcode 4.6

 

1. Create a new project

 

1. Open xcode, file --> New --> project... --> Empty Application

2. The project name is nsurlconnectiondemo. If none of the following options are selected, the creation is complete.

 

Ii. Create a View Controller

 

3. file --> New --> file --> Objective-C Class

4. Create a subclass of uiviewcontroller named testviewcontroller.

 

3. Create a View Controller instance

 

5. Introduce in appdelegate. m

# Import "testviewcontroller. H"

6. Add testviewcontroller to the form

 

-(Bool) Application :( uiapplication *) Application didfinishlaunchingwitexceptions :( nsdictionary *) launchoptions

{

Self. Window = [[[uiappswalloc] initwithframe: [[uiscreenmainscreen] bounds] autorelease];

Testviewcontroller * rootcontroller = [[testviewcontrolleralloc] init];

Self. Window. rootviewcontroller = rootcontroller;

Self. Window. backgroundcolor = [uicolorwhitecolor];

[Self. windowmakekeyandvisible];

[Rootcontroller release];

Returnyes;

}

 

7. Add two variables to testviewcontroller. h.

 

@ Interface testviewcontroller: uiviewcontroller {

Nsmutabledata * pagedata;

Uiwebview * webview;

}

 

8. Add the button and uiwebview in testviewcontroller. M.

 

-(Void) viewdidload

{

[Superviewdidload];

// Do any additional setup after loading the view.

Uibutton * button = [uibuttonbuttonwithtype: uibuttontyperoundedrect];

[Self. View addsubview: button];

[Button settitle: @ "start" forstate: uicontrolstatenormal];

[Button setframe: cgrectmake (300, 40)];

[Button addtarget: selfaction: @ selector (Openurl) forcontrolevents: uicontroleventtouchupinside];

Webview = [[uiwebviewalloc] initwithframe: cgrectmake (0, 50,320,400)];

[Webviewsetuserinteractionenabled: No];

[Webviewsetbackgroundcolor: [uicolorclearcolor];

[Webview setopaque: No];

[Self. View addsubview: webview];

}

 

9. Events for Button clicking

 

-(Void) Openurl

{

 

Nsurl * url = [nsurlurlwithstring: @ "http://www.baidu.com"];

Nsmutableurlrequest * request = [[nsmutableurlrequestalloc] initwithurl: URL cachepolicy: nsurlrequestreloadignoringlocalcachedatatimeoutinterval: 60];

Pagedata = [[nsmutabledata alloc] init];

[Request sethttpmethod: @ "get"];

[Request addvalue: @ "text/html" forhttpheaderfield: @ "Content-Type"];

Nsurlconnection * conn = [[nsurlconnectionalloc] initwithrequest: Request delegate: Self];

[Request release];

[Conn release];

}

 

10. Two methods for implementing the nsurlconnection proxy

 

-(Void) connection :( nsurlconnection *) aconn didreceivedata :( nsdata *) Data {

[Pagedata appenddata: Data];

}

 

-(Void) connectiondidfinishloading :( nsurlconnection *) aconn {

Nsstring * Results = [[nsstringalloc] initwithdata: pagedataencoding: nsutf8stringencoding];

[Webviewloadhtmlstring: Results baseurl: Nil];

}

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