iOS开发中WebView的使用

在AppDelegate.m文件里

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

webTableViewController.m

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

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