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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:@"http://c.3g.163.com/nc/article/%@/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=\"%@\" /></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];
- }];
- }
======================================================================================================
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 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。
有疑问可通过新浪微博私信给我:http://weibo.com/hanjunqiang
