UIWebView常用方法的简单使用

通过url加载（代理方式）

#import "ViewController.h"

@interface ViewController ()
@property (weak, nonatomic) IBOutlet UIWebView *webView;
@property (weak, nonatomic) IBOutlet UIBarButtonItem *backItem;
@property (weak, nonatomic) IBOutlet UIBarButtonItem *forwardItem;


@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    

    self.webView.delegate = self;
    //通过一个url，加载一个网页
    [self.webView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@"http://www.jianshu.com"]]];
    
    //页面内容自适应整个屏幕大小
    self.webView.scalesPageToFit = YES;
    //设置边距
    self.webView.scrollView.contentInset = UIEdgeInsetsMake(20, 0, 0, 0);
      
}
//返回
- (IBAction)goBack:(UIBarButtonItem *)sender {
    
    [self.webView goBack];
}
//前进
- (IBAction)goForward:(UIBarButtonItem *)sender {
    
    [self.webView goForward];
}
//刷新
- (IBAction)refresh:(UIBarButtonItem *)sender {
    
    [self.webView reload];
}

#pragma mark -
#pragma mark - 
//已经开始加载
-(void)webViewDidStartLoad:(UIWebView *)webView{
    
    NSLog(@"开始加载了");
    
}
//已经完成加载
- (void)webViewDidFinishLoad:(UIWebView *)webView{
    
    //设置前进、后退按钮的点击
    self.backItem.enabled = webView.canGoBack;
    self.forwardItem.enabled = webView.canGoForward;
}

//加载出现错误
- (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error{
    
    self.backItem.enabled = webView.canGoBack;
    self.forwardItem.enabled = webView.canGoForward;

}
/*
 *每当webView即将发送请求之前，都会调用这个方法
 *返回YES：允许加载这个请求
 *返回NO：禁止加载这个请求
 */
- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType{
    
    if([request.URL.absoluteString containsString:@"2015"]) return NO;
    
    return YES;

}

storyboard.png

通过本地路径加载

    
    //[self.webView loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath:@"/Users/mac1/Desktop/IOS.pdf"]]];

    

通过HTML字符串加载

    
    //[self.webView loadHTMLString:@"
" baseURL:nil];

通过html文件加载

    // 检测各种特殊的字符串：比如电话、网站等，效果为加下划线，长按有响应的操作
    self.webView.dataDetectorTypes = UIDataDetectorTypeAll;
    
    [self.webView loadRequest:[NSURLRequest requestWithURL:[[NSBundle mainBundle] URLForResource:@"test" withExtension:@"html"]]];

test.html.png