iOS开发中WebView的使用

在AppDelegate.m文件中

#import "AppDelegate.h"
#import "webTableViewController.h"
@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    // Override point for customization after application launch.
    self.window.backgroundColor = [UIColor whiteColor];
    webTableViewController *web = [[webTableViewController alloc]init];
    self.window.rootViewController = web;
    [self.window makeKeyAndVisible];
    return YES;
}

新键一个类命名为webTableViewController

webTableViewController.h

#import <UIKit/UIKit.h>

@interface webTableViewController : UIViewController<UIWebViewDelegate>
{
    IBOutlet UIWebView *webView;
    
    UIActivityIndicatorView *activityIndicatorView;
    UIView *opaqueView;
}

@end

#import "webTableViewController.h"

@interface webTableViewController ()

@end

@implementation webTableViewController
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    webView = [[UIWebView alloc]initWithFrame:CGRectMake(0, 44, 320, 440)];
    [webView setUserInteractionEnabled:YES];//是否支持交互
    //[webView setDelegate:self];
    webView.delegate=self;
    [webView setOpaque:NO];//opaque是不透明的意思
    [webView setScalesPageToFit:YES];//自动缩放以适应屏幕
    [self.view addSubview:webView];
    
    //加载网页的方式
    //1.创建并加载远程网页
    NSURL *url = [NSURL URLWithString:@"http://www.baidu.com"];
    [webView loadRequest:[NSURLRequest requestWithURL:url]];
    //2.加载本地文件资源
   /* NSURL *url = [NSURL fileURLWithPath:filePath];
    NSURLRequest *request = [NSURLRequest requestWithURL:url];
    [webView loadRequest:request];*/
    //3.读入一个HTML，直接写入一个HTML代码
    //NSString *htmlPath = [[[NSBundle mainBundle]bundlePath]stringByAppendingString:@"webapp/loadar.html"];
    //NSString *htmlString = [NSString stringWithContentsOfURL:htmlPath encoding:NSUTF8StringEncoding error:NULL];
    //[webView loadHTMLString:htmlString baseURL:[NSURL fileURLWithPath:htmlPath]];
    
    opaqueView = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 320, 480)];
    activityIndicatorView = [[UIActivityIndicatorView alloc]initWithFrame:CGRectMake(0, 0, 320, 480)];
    [activityIndicatorView setCenter:opaqueView.center];
    [activityIndicatorView setActivityIndicatorViewStyle:UIActivityIndicatorViewStyleWhite];
    [opaqueView setBackgroundColor:[UIColor blackColor]];
    [opaqueView setAlpha:0.6];
    [self.view addSubview:opaqueView];
    [opaqueView addSubview:activityIndicatorView];
    
    
}

-(void)webViewDidStartLoad:(UIWebView *)webView{
    [activityIndicatorView startAnimating];
    opaqueView.hidden = NO;
}

-(void)webViewDidFinishLoad:(UIWebView *)webView{
    [activityIndicatorView startAnimating];
    opaqueView.hidden = YES;
}

//UIWebView如何判断 HTTP 404 等错误
-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response{
    NSURL *url = [NSURL URLWithString:@"http://www.baidu.com"];
    NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse *)response;
    if ((([httpResponse statusCode]/100) == 2)) {
        // self.earthquakeData = [NSMutableData data];
        [UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
        
        [ webView loadRequest:[ NSURLRequest requestWithURL: url]];
        webView.delegate = self;
    } else {
        NSDictionary *userInfo = [NSDictionary dictionaryWithObject:
                                  NSLocalizedString(@"HTTP Error",
                                                    @"Error message displayed when receving a connection error.")
                                                             forKey:NSLocalizedDescriptionKey];
        NSError *error = [NSError errorWithDomain:@"HTTP" code:[httpResponse statusCode] userInfo:userInfo];
        
        if ([error code] == 404) {
            NSLog(@"xx");
            webView.hidden = YES;
        }
        
    }
}
- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

iOS开发中WebView的使用,布布扣,bubuko.com

iOS开发中WebView的使用