ios_webView

iOS开发中WebView的使用

在AppDelegate.m文件里

 

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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

 

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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

 

 

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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