直奔核心:

#import "TechnologyDetailViewController.h" #define kScreenWidth [UIScreen mainScreen].bounds.size.width #define kScreenHeight [UIScreen mainScreen].bounds.size.height @interface TechnologyDetailViewController () @property (nonatomic,retain)UIWebView *webView;//显示详情页面 @end
@implementation TechnologyDetailViewController - (void)dealloc { self.webView = nil; self.ids = nil; [super dealloc]; } - (void)viewDidLoad { [super viewDidLoad]; //设置背景 self.view.backgroundColor = [UIColor yellowColor]; //调用请求网络数据 [self readDataFromNetWork]; // self.automaticallyAdjustsScrollViewInsets = NO; [self.view addSubview:self.webView]; }

懒加载UIWebView

//懒加载 - (UIWebView *)webView{ if (!_webView) { self.webView = [[[UIWebView alloc]initWithFrame:CGRectMake(0,0, [UIScreen mainScreen].bounds.size.width, [UIScreen mainScreen].bounds.size.height)]autorelease]; self.webView.backgroundColor = [UIColor orangeColor]; } return [[_webView retain ]autorelease]; }

核心代码如下: //解析数据 - (void)readDataFromNetWork{ NSString *str = [NSString stringWithFormat:@"%@/full.html",self.ids]; NSURL *url = [NSURL URLWithString:str]; NSURLRequest *request = [NSURLRequest requestWithURL:url]; [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) { NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil]; NSString *body = dic[self.ids][@"body"]; NSString * title = dic[self.ids][@"title"]; NSString *digest = dic[self.ids][@"digest"]; NSString *ptime = dic[self.ids][@"ptime"]; NSString * source = dic[self.ids][@"source"]; NSArray * img = dic[self.ids][@"img" ] ; // NSLog(@"%@",img); if (img.count) { for (int i = 0; i < img.count; i ++) { NSString *imgString = [NSString stringWithFormat:@"<p style="text-align:center"><img src=http://www.it165.net/pro/html/201511/"%@" /></p>",img[i][@"src"]]; NSLog(@"imString = %@",imgString); imgString = [imgString stringByReplacingOccurrencesOfString:@"<!--IMG#%d-->" withString:imgString]; body = [imgString stringByAppendingString:body]; } } // NSLog(@"body = %@",body); //借助第三方进行排版 NSString *filePath = [[NSBundle mainBundle]pathForResource:@"topic_template" ofType:@"html"]; NSString *htmlString = [NSString stringWithContentsOfFile:filePath encoding:NSUTF8StringEncoding error:nil]; htmlString = [htmlString stringByReplacingOccurrencesOfString:@"__BODY__" withString:body]; htmlString = [htmlString stringByReplacingOccurrencesOfString:@"__TITLE__" withString:title]; htmlString = [htmlString stringByReplacingOccurrencesOfString:@"__AUTHOR__" withString:source]; htmlString = [htmlString stringByReplacingOccurrencesOfString:@"__DIGEST__" withString:digest]; htmlString = [htmlString stringByReplacingOccurrencesOfString:@"__TIME__" withString:ptime]; htmlString = [htmlString stringByReplacingOccurrencesOfString:@"__PTIME__" withString:ptime]; [self.webView loadHTMLString:htmlString baseURL:nil]; }]; }

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实在看不懂再看下demol例子:

UIWebView的loadRequest可以用来加载一个url地址，它需要一个NSURLRequest参数。我们定义一个方法用来加载url。在UIWebViewDemoViewController中定义下面方法：

- (void)loadWebPageWithString:(NSString*)urlString { NSURL *url =[NSURL URLWithString:urlString]; NSLog(urlString); NSURLRequest *request =[NSURLRequest requestWithURL:url]; [webView loadRequest:request]; }

在界面上放置3个控件，一个textfield、一个button、一个uiwebview，布局如下：

在代码中定义相关的控件：webView用于展示网页、textField用于地址栏、activityIndicatorView用于加载的动画、buttonPress用于按钮的点击事件。

@interface UIWebViewDemoViewController :UIViewController<UIWebViewDelegate> { IBOutlet UIWebView *webView; IBOutlet UITextField *textField; UIActivityIndicatorView *activityIndicatorView; } - (IBAction)buttonPress:(id) sender; - (void)loadWebPageWithString:(NSString*)urlString; @end

使用IB关联他们。

设置UIWebView，初始化UIActivityIndicatorView：

- (void)viewDidLoad { [super viewDidLoad]; webView.scalesPageToFit =YES; webView.delegate =self; activityIndicatorView = [[UIActivityIndicatorView alloc] initWithFrame : CGRectMake(0.0f, 0.0f, 32.0f, 32.0f)] ; [activityIndicatorView setCenter: self.view.center] ; [activityIndicatorView setActivityIndicatorViewStyle: UIActivityIndicatorViewStyleWhite] ; [self.view addSubview : activityIndicatorView] ; [self buttonPress:nil]; // Do any additional setup after loading the view from its nib. }

UIWebView主要有下面几个委托方法：

1、- (void)webViewDidStartLoad:(UIWebView *)webView;开始加载的时候执行该方法。
2、- (void)webViewDidFinishLoad:(UIWebView *)webView;加载完成的时候执行该方法。
3、- (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error;加载出错的时候执行该方法。

我们可以将activityIndicatorView放置到前面两个委托方法中。

- (void)webViewDidStartLoad:(UIWebView *)webView { [activityIndicatorView startAnimating] ; } - (void)webViewDidFinishLoad:(UIWebView *)webView { [activityIndicatorView stopAnimating]; }

buttonPress方法很简单，调用我们开始定义好的loadWebPageWithString方法就行了：

- (IBAction)buttonPress:(id) sender { [textField resignFirstResponder]; [self loadWebPageWithString:textField.text]; }

当请求页面出现错误的时候，我们给予提示：

- (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error { UIAlertView *alterview = [[UIAlertView alloc] initWithTitle:@"" message:[error localizedDescription] delegate:nil cancelButtonTitle:nil otherButtonTitles:@"OK", nil]; [alterview show]; [alterview release]; }

总结：本文通过实现一个简单的浏览器，说明了uiwebview的方法和属性，相信通过这个例子，应该明白uiwebview的使用了。
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