1.UIWebView的内容控制的属性／方法列表
loading属性 确认当前页面是否在读入中
canGoForward属性 确认goForward 方法是否可执行，可执行为yes；
canGoBack属性 确认goBack 方法是否可执行，可执行为yes；
goBack方法 返回前一个页面
goForword方法 进入下一个页面
reload方法 重新读入当前页
stopLoading方法 中止当前页的读入
2.webViewController.h
@interface webViewController : UIViewController<UIWebViewDelegate,UINavigationControllerDelegate,UINavigationBarDelegate>
{
UIWebView *_webView;
}
@property(nonatomic,strong)UIBarButtonItem *reloadButton;
@property(nonatomic,strong)UIBarButtonItem *stopButton;
@property(nonatomic,strong)UIBarButtonItem *backButton;
@property(nonatomic,strong)UIBarButtonItem *forwardButton;
@end
webViewController.m
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
self.navigationItem.title = @"UIWebView测试版";
_webView = [[UIWebView alloc]init];
_webView.delegate = self;
_webView.frame = self.view.frame;
_webView.autoresizingMask = UIViewAutoresizingFlexibleHeight|UIViewAutoresizingFlexibleWidth;
_webView.scalesPageToFit = YES;
[self.view addSubview:_webView];
//工具条中追加按钮
_reloadButton = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemRefresh target:self action:@selector(reloadDidPush)];
_stopButton = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemStop target:self action: @selector(stopDidPush)];
_backButton = [[UIBarButtonItem alloc]initWithTitle:@"back" style:UIBarButtonItemStyleBordered target:self action:@selector(backDidPush)];
_forwardButton = [[UIBarButtonItem alloc]initWithTitle:@"Forward" style:UIBarButtonItemStyleBordered target:self action:@selector(forwardDidPush)];
NSArray *buttons = [NSArray arrayWithObjects:_backButton,_forwardButton,_reloadButton,_stopButton, nil];
[self setToolbarItems:buttons animated:YES];
[self.navigationController setToolbarHidden:NO animated:YES];
}
-(void)reloadDidPush
{
[_webView reload];//重新读入页面
}
-(void)stopDidPush
{
if(_webView.loading){
[_webView stopLoading];//读入停止
}
}
-(void)backDidPush
{
if (_webView.canGoBack) {
[_webView goBack];//返回前一画面
}
}
-(void)forwardDidPush
{
if (_webView.canGoForward) {
[_webView goForward];//进入下一页面
}
}
-(void)updateControlEnabled
{
//统一更新指示按钮状态
[UIApplication sharedApplication].networkActivityIndicatorVisible = _webView.loading;
_stopButton.enabled = _webView.loading;
_backButton.enabled = _webView.canGoBack;
_forwardButton.enabled = _webView.canGoForward;
}
-(void)viewDidAppear:(BOOL)animated
{
//画面显示结果后读入web页面画面
[super viewDidAppear:animated];
NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://www.baidu.com"]];
[_webView loadRequest:request];
[self updateControlEnabled];
}
-(void)viewWillDisappear:(BOOL)animated
{
//画面关闭时状态的活动指示器设置成off
[super viewWillDisappear:animated];
[UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
}
-(void)webViewDidStartLoad:(UIWebView *)webView{
[self updateControlEnabled];
}
-(void)webViewDidFinishLoad:(UIWebView *)webView
{
[self updateControlEnabled];
}
-(void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error
{
[self updateControlEnabled];
}