代码语言:javascript复制
@interface ViewController ()<UIWebViewDelegate>
@property (weak, nonatomic) IBOutlet UIBarButtonItem backItem;
@property (weak, nonatomic) IBOutlet UIBarButtonItem forwardItem;
@property(nonatomic,weak)UIWebView * webView;
(IBAction)back;
(IBAction)forward;
@end
@implementation ViewController
(void)viewDidLoad {
[super viewDidLoad];
//1.创建webView
UIWebView * webView = [[UIWebView alloc]init];
webView.frame = self.view.bounds;
self.webView = webView;
[self.view addSubview:webView];
//设置代理
webView.delegate = self;
//2.加载请求
//加载的三种方式,加载三种数据
//《1》加载url请求
// NSURL url = [[NSBundle mainBundle]URLForResource:@"login" withExtension:@"html"];
// NSURLRequest request = [NSURLRequest requestWithURL:url];
// [webView loadRequest:request];
//《2》加载html(用于显示传递过来的内容,因为loadHTMLString传递的是什么,就显示什么)(这种方式加载的网页,不能回退)
// NSString path = [[NSBundle mainBundle]pathForResource:@"login.html" ofType:nil];
// NSString string = [NSString stringWithContentsOfFile:path encoding:NSUTF8StringEncoding error:nil];
// NSLog(@"----%@", string);
// [webView loadHTMLString:string baseURL:nil];
//《3》加载data数据(可以加载图片,word,pdf等)(这个方法加载的也不能回退)
//获取路径
NSString * path = [[NSBundle mainBundle]pathForResource:@"hell" ofType:@"pdf"];
//获取mimetype
NSURL * url = [NSURL fileURLWithPath:path];//不要使用urlWithString方法
NSURLRequest * request = [NSURLRequest requestWithURL:url];
NSURLResponse * rest = nil;
[NSURLConnection sendSynchronousRequest:request returningResponse:&rest error:nil];//因为需要使用这个返回值,所以使用同步方法
//加载
NSData * data = [NSData dataWithContentsOfFile:path];
[webView loadData:data MIMEType:rest.MIMEType textEncodingName:@"utf8"baseURL:nil];
NSLog(@"MIMEType-----%@",rest.MIMEType);
NSLog(@"%ld",data.length);
}
(IBAction)back{
[self.webView goBack];//不使用dismiss方法,因为跳转的不是控制器
}
(IBAction)forward {
[self.webView goForward];//前进
}
pragma mark - UIWebViewDelegate(四个代理方法)
(void)webViewDidStartLoad:(UIWebView *)webView{
// NSLog(@"webViewDidStartLoad");
}
(void)webViewDidFinishLoad:(UIWebView *)webView{
// if ([webView canGoBack]) {//先判断这个页面有没有返回功能
// self.backItem.enabled = YES;
// }else{
// self.backItem.enabled = NO;
// }
//简便写法
NSLog(@"########%i", [webView canGoBack]);
self.backItem.enabled = [webView canGoBack];
self.forwardItem.enabled = [webView canGoForward];
}
(void)webView:(UIWebView )webView didFailLoadWithError:(NSError )error{
// NSLog(@"didFailLoadWithError");
}
(BOOL)webView:(UIWebView )webView shouldStartLoadWithRequest:(NSURLRequest )request navigationType:(UIWebViewNavigationType)navigationType{
//URL
//"http://www.baidu.com/"
//协议头://主机名//路径
//过滤掉还有baidu的url
// NSString * path = request.URL.absoluteString;//注意不是URL.path这个方法,这个方法返回的是“/”
// NSInteger location = [path rangeOfString:@"baidu"].location;
// if (location != NSNotFound) {
// return NO;
// }
NSLog(@"%@", request.URL.absoluteString);
return YES;
}
@end
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