UI 一一 UIWebView的应用小案例

效果图:

知识点:

// 即将加载某个请求的时候调用
- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType
{
    // 输出某个请求的url
    NSLog(@"+++++++++++++++++++%@",request.URL.absoluteString);
    // 简单请求的拦截处理(当请求的url路径中包含360字眼,就会请求失败)
    NSString *strM = request.URL.absoluteString;
    if ([strM containsString:@"image"]) {
        return NO;
    }
    return YES;
}

代码:

//  Created by 朝阳 on 2017/12/20.
//  Copyright © 2017年 sunny. All rights reserved.
//

#import "ViewController.h"

@interface ViewController ()

@property (weak, nonatomic) IBOutlet UIWebView *webView;
@property (weak, nonatomic) IBOutlet UIBarButtonItem *goBack;
@property (weak, nonatomic) IBOutlet UIBarButtonItem *goForward;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    NSURL *url = [NSURL URLWithString:@"http://www.baidu.com"];
    NSURLRequest *request = [NSURLRequest requestWithURL:url];
    // 加载网页
    [self.webView loadRequest:request];
    self.webView.scalesPageToFit = YES;
    
    // 设置代理
    self.webView.delegate = self;
    
}

- (IBAction)goBack:(id)sender
{
    [self.webView goBack];
}

- (IBAction)goForward:(id)sender
{
    [self.webView goForward];
}

- (IBAction)reload:(id)sender
{
    [self.webView reload];
}

#pragma -mark UIWebViewDelegate

// 即将加载某个请求的时候调用
- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType
{
    // 输出某个请求的url
    NSLog(@"+++++++++++++++++++%@",request.URL.absoluteString);
    // 简单请求的拦截处理(当请求的url路径中包含360字眼,就会请求失败)
    NSString *strM = request.URL.absoluteString;
    if ([strM containsString:@"image"]) {
        return NO;
    }
    return YES;
}

// 开始加载网页的时候调用
- (void)webViewDidStartLoad:(UIWebView *)webView
{
    NSLog(@"webViewDidStartLoad");;
}

// 加载完成的时候调用
- (void)webViewDidFinishLoad:(UIWebView *)webView
{
    NSLog(@"webViewDidFinishLoad");
    self.goBack.enabled = self.webView.canGoBack;
    self.goForward.enabled = self.webView.canGoForward;
}

// 加载失败的时候调用
- (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error
{
    NSLog(@"didFailLoadWithError");
}

@end