模擬UIWebView

//
//  ViewController.m
//  模擬UIWebView
//
//  Created by dc0061 on 15/12/10.
//  Copyright © 2015年 dc0061. All rights reserved.
//

#import "ViewController.h"

@interface ViewController ()<UISearchBarDelegate,UIWebViewDelegate>
{
    UISearchBar *_bar;
    UIWebView *_webView;
    UIToolbar *_toolbar;
    UIBarButtonItem *_backButton;
    UIBarButtonItem *_forwarButton;
}
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    [self layout];
}
- (void) layout{
    //添加搜索欄
    _bar=[[UISearchBar alloc]initWithFrame:CGRectMake(0, 20, 375, 50)];
    _bar.delegate=self;
    [self.view addSubview:_bar];
    //添加瀏覽器
    _webView =[[UIWebView alloc]initWithFrame:CGRectMake(0, 90, 375, 527)];
    _webView.delegate=self;
    [self.view addSubview:_webView];
    
    _toolbar=[[UIToolbar alloc]initWithFrame:CGRectMake(0, 617, 375, 50)];
    [self.view addSubview:_toolbar];
    
    _backButton =[[UIBarButtonItem alloc]initWithTitle:@"返回⬅️" style:UIBarButtonItemStyleDone target:self action:@selector(fanhui)];
    
    _forwarButton =[[UIBarButtonItem alloc]initWithTitle:@"前進→" style:UIBarButtonItemStyleDone target:self action:@selector(qianjin)];
   //空按鈕，沒有點擊事件
    UIBarButtonItem *btnSpacing=[[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:self action:nil];
    _toolbar.items=@[_backButton,btnSpacing,_forwarButton];
}

#pragma mark UISearchBar代理方法
- (void) searchBarSearchButtonClicked:(UISearchBar *)searchBar{
    [self request:searchBar.text];
}

#pragma mark UIWebView開始時調用的方法
-(void) webViewDidStartLoad:(UIWebView *)webView{
    NSLog(@"UIWebView開始時調用的方法");
    [UIApplication sharedApplication].networkActivityIndicatorVisible=YES;
}
#pragma mark UIWebView加載結束時調用的方法
- (void) webViewDidFinishLoad:(UIWebView *)webView{
    _bar.text=[NSString stringWithFormat:@"%@",webView.request.URL];
    [UIApplication sharedApplication].networkActivityIndicatorVisible=NO;
}
- (void) request : (NSString *) name{
    NSURL *url;
    if([name hasPrefix:@"file://"]){
        //1獲取文件位置
        NSRange rang=[name rangeOfString:@"file://"];
        NSString *urlName=[name substringFromIndex:rang.length];
        //獲取文件位置
        url=[[NSBundle mainBundle]URLForResource:urlName withExtension:nil];
    }else{
        NSString *str=[NSString stringWithFormat:@"http://www.baidu.com/s?&wd=%@",name];
        str=[str stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLQueryAllowedCharacterSet]];//將url先進行編碼
        url=[NSURL URLWithString:str];
        
    }
    
    [_webView loadRequest:[NSURLRequest requestWithURL:url]];
}

- (void) fanhui{
    [_webView goBack];
}

- (void) qianjin{
    [_webView goForward];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
}

@end