ios_webView

iOS开发中WebView的使用

在AppDelegate.m文件里

view
sourceprint

" class="item about" style="color:rgb(51,51,51); text-decoration:none; margin:0px 0px 0px 8px; padding:0px; border-width:0px 0px 1px; border-bottom-style:dotted; border-bottom-color:rgb(51,51,51); outline:0px; float:left; vertical-align:baseline; position:static; left:auto; top:auto; right:auto; bottom:auto; height:16px; width:16px; display:block; overflow:hidden; text-indent:-5000px">?

01.#import "AppDelegate.h"

02.#import "webTableViewController.h"

03.@implementation AppDelegate

04. 

05.-
(BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions

06.{

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

08.//
Override point for customization after application launch.

09.self.window.backgroundColor
= [UIColor whiteColor];

10.webTableViewController
*web = [[webTableViewController alloc]init];

11.self.window.rootViewController
= web;

12.[self.window
makeKeyAndVisible];

13.return YES;

14.}

新键一个类命名为webTableViewController

webTableViewController.h

view
sourceprint

" class="item about" style="color:rgb(51,51,51); text-decoration:none; margin:0px 0px 0px 8px; padding:0px; border-width:0px 0px 1px; border-bottom-style:dotted; border-bottom-color:rgb(51,51,51); outline:0px; float:left; vertical-align:baseline; position:static; left:auto; top:auto; right:auto; bottom:auto; height:16px; width:16px; display:block; overflow:hidden; text-indent:-5000px">?

01.#import <UIKit/UIKit.h>

02. 

03.@interface webTableViewController
: UIViewController<UIWebViewDelegate>

04.{

05.IBOutlet
UIWebView *webView;

06. 

07.UIActivityIndicatorView
*activityIndicatorView;

08.UIView
*opaqueView;

09.}

10. 

11.@end

webTableViewController.m

view
sourceprint

" class="item about" style="color:rgb(51,51,51); text-decoration:none; margin:0px 0px 0px 8px; padding:0px; border-width:0px 0px 1px; border-bottom-style:dotted; border-bottom-color:rgb(51,51,51); outline:0px; float:left; vertical-align:baseline; position:static; left:auto; top:auto; right:auto; bottom:auto; height:16px; width:16px; display:block; overflow:hidden; text-indent:-5000px">?

01.#import "webTableViewController.h"

02. 

03.@interface webTableViewController
()

04. 

05.@end

06. 

07.@implementation webTableViewController

08.-
(id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil

09.{

10.self
= [super initWithNibName:nibNameOrNil
bundle:nibBundleOrNil];

11.if (self)
{

12.//
Custom initialization

13.}

14.return self;

15.}

16. 

17.-
(void)viewDidLoad

18.{

19.[super viewDidLoad];

20.webView
= [[UIWebView alloc]initWithFrame:CGRectMake(0, 44, 320, 440)];

21.[webView
setUserInteractionEnabled:YES];//是否支持交互

22.//[webView
setDelegate:self];

23.webView.delegate=self;

24.[webView
setOpaque:NO];//opaque是不透明的意思

25.[webView
setScalesPageToFit:YES];//自己主动缩放以适应屏幕

26.[self.view
addSubview:webView];

27. 

28.//载入网页的方式

29.//1.创建并载入远程网页

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

31.[webView
loadRequest:[NSURLRequest requestWithURL:url]];

32.//2.载入本地文件资源

33./*
NSURL *url = [NSURL fileURLWithPath:filePath];

34.NSURLRequest
*request = [NSURLRequest requestWithURL:url];

35.[webView
loadRequest:request];*/

36.//3.读入一个HTML。直接写入一个HTML代码

37.//NSString
*htmlPath = [[[NSBundle mainBundle]bundlePath]stringByAppendingString:@"webapp/test.html"];

38.//NSString
*htmlString = [NSString stringWithContentsOfURL:htmlPath encoding:NSUTF8StringEncoding error:NULL];

39.//[webView
loadHTMLString:htmlString baseURL:[NSURL fileURLWithPath:htmlPath]];

40. 

41.opaqueView
= [[UIView alloc]initWithFrame:CGRectMake(0, 0, 320, 480)];

42.activityIndicatorView
= [[UIActivityIndicatorView alloc]initWithFrame:CGRectMake(0, 0, 320, 480)];

43.[activityIndicatorView
setCenter:opaqueView.center];

44.[activityIndicatorView
setActivityIndicatorViewStyle:UIActivityIndicatorViewStyleWhite];

45.[opaqueView
setBackgroundColor:[UIColor blackColor]];

46.[opaqueView
setAlpha:0.6];

47.[self.view
addSubview:opaqueView];

48.[opaqueView
addSubview:activityIndicatorView];

49. 

50. 

51.}

52. 

53.-(void)webViewDidStartLoad:(UIWebView
*)webView{

54.[activityIndicatorView
startAnimating];

55.opaqueView.hidden
= NO;

56.}

57. 

58.-(void)webViewDidFinishLoad:(UIWebView
*)webView{

59.[activityIndicatorView
startAnimating];

60.opaqueView.hidden
= YES;

61.}

62. 

63.//UIWebView怎样推断
HTTP 404 等错误

64.-(void)connection:(NSURLConnection
*)connection didReceiveResponse:(NSURLResponse *)response{

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

66.NSHTTPURLResponse
*httpResponse = (NSHTTPURLResponse *)response;

67.if ((([httpResponse
statusCode]/100)
== 2))
{

68.//
self.earthquakeData = [NSMutableData data];

69.[UIApplication
sharedApplication].networkActivityIndicatorVisible = YES;

70. 

71.[
webView loadRequest:[ NSURLRequest requestWithURL: url]];

72.webView.delegate
= self;

73.} else {

74.NSDictionary
*userInfo = [NSDictionary dictionaryWithObject:

75.NSLocalizedString(@"HTTP
Error",

76.@"Error
message displayed when receving a connection error.")

77.forKey:NSLocalizedDescriptionKey];

78.NSError
*error = [NSError errorWithDomain:@"HTTP" code:[httpResponse
statusCode] userInfo:userInfo];

79. 

80.if ([error
code] == 404)
{

81.NSLog(@"xx");

82.webView.hidden
= YES;

83.}

84. 

85.}

86.}

87.-
(void)didReceiveMemoryWarning

88.{

89.[super didReceiveMemoryWarning];

90.//
Dispose of any resources that can be recreated.

91.}

92. 

93.@end