用uiwebview和UITextField做个简易的safari浏览器

原创于 2013-06-19 17:23:08 发布 · 513 阅读

CC 4.0 BY-SA版权

本文介绍了一个简单的iOS应用开发实例，该应用使用UIWebView来显示网页并允许用户输入URL进行浏览。文中详细展示了如何创建UIWebView、设置其属性及响应用户输入事件。

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//
//  InstallSolftViewController.m
//  InstallSolft
//
//  Created by visen on 11-8-5.
//  Copyright 2011 __MyCompanyName__. All rights reserved.
//

#import "InstallSolftViewController.h"

@implementation InstallSolftViewController

- (void)viewDidLoad {
	[super viewDidLoad];
	CGRect webFrame = [[UIScreen mainScreen] applicationFrame]; //web大小
	webFrame.origin.y += 25;//向下移动为了留出输入网址的frame
	//webFrame.size.height -= 80;
	myWebView = [[[UIWebView alloc] initWithFrame:webFrame] autorelease];
	myWebView.backgroundColor = [UIColor redColor]; //背景色
	myWebView.scalesPageToFit = YES;
	myWebView.autoresizingMask = (UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight);
	myWebView.delegate = self;
	[self.view addSubview:myWebView];
	
	CGRect textFieldFrame = CGRectMake(0, 0,
									   self.view.bounds.size.width, 50); 
	UITextField *urlField = [[UITextField alloc] initWithFrame:textFieldFrame];//输入框
	urlField.borderStyle = UITextBorderStyleBezel;
	urlField.textColor = [UIColor blackColor];
	urlField.delegate = self;
	urlField.placeholder = @"<enter a URL>"; //提示
	urlField.text = @"http://www.163.com";//开始显示的网址
	urlField.backgroundColor = [UIColor whiteColor];
	urlField.autoresizingMask = UIViewAutoresizingFlexibleWidth;
	urlField.returnKeyType = UIReturnKeyGo; //return 显示的是GO
	urlField.keyboardType = UIKeyboardTypeURL; // 方便输入网址的类型键盘
	urlField.autocapitalizationType = UITextAutocapitalizationTypeNone; // don't capitalize
	urlField.autocorrectionType = UITextAutocorrectionTypeNo; // we don't like autocompletion while typing
	urlField.clearButtonMode = UITextFieldViewModeAlways; //输入框右边的 “叉”
	[urlField setAccessibilityLabel:NSLocalizedString(@"URLTextField", @"")];
	[self.view addSubview:urlField];
	[urlField release];
	
	[myWebView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@"http://www.163.com/"]]];//自动加载URL
}

//4 U can see the frame from above.
//5This function makes your view rotation was supported.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
	return YES;
}

//6 After you enter a URL, if you press "Done", the keyboard miss and open the URL you just typed.
- (BOOL)textFieldShouldReturn:(UITextField *)textField
{
	[textField resignFirstResponder];
	[myWebView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:[textField text]]]];
	return YES;
}

//7 don't forget be a good memory citizen
- (void)dealloc {
myWebView.delegate = nil;
[myWebView release];
[super dealloc];
}

//8 OK, in fact , all works very well for now. Next , call this two functions is just in case.
#pragma mark -
#pragma mark UIViewController delegate methods
- (void)viewWillAppear:(BOOL)animated
{
myWebView.delegate = self; // setup the delegate as the web view is shown
NSLog(@"willappear");
}

- (void)viewWillDisappear:(BOOL)animated
{
[myWebView stopLoading]; // in case the web view is still loading its content
myWebView.delegate = nil; // disconnect the delegate as the webview is hidden
[UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
NSLog(@"willDisappear");
}

#pragma mark -
#pragma mark UIWebViewDelegate

- (void)webViewDidStartLoad:(UIWebView *)webView
{
// 状态栏上的缓冲标志
[UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
}

- (void)webViewDidFinishLoad:(UIWebView *)webView
{
// 消除缓冲标志
[UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
}

- (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error
{

[UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
// 报告错误
NSString* errorString = [NSString stringWithFormat:
@"<html><center><font size=+5 color='red'>An error occurred:<br>%@</font></center></html>",
error.localizedDescription];
[myWebView loadHTMLString:errorString baseURL:nil];
}

@end