IPhone用户登录框的一些代码

在一个页面之上生成并插入新页面的代码

- (UIViewController *)presentingController
{
	if (!presentingController) {
		presentingController = [[ASIAutorotatingViewController alloc] initWithNibName:nil bundle:nil];

		// Attach to the window, but don't interfere.
		UIWindow *window = [[[UIApplication sharedApplication] windows] objectAtIndex:0];
		[window addSubview:[presentingController view]];
		[[presentingController view] setFrame:CGRectZero];
		[[presentingController view] setUserInteractionEnabled:NO];
	}

	return presentingController;
}

 

插入view需要有viewcontroller

下面代码是显示登录对话框

- (void)showTitle
{
	UINavigationBar *navigationBar = [[[self view] subviews] objectAtIndex:0];
	UINavigationItem *navItem = [[navigationBar items] objectAtIndex:0];
	if (UIInterfaceOrientationIsPortrait([[UIDevice currentDevice] orientation])) {
		// Setup the title
		if ([self type] == ASIProxyAuthenticationType) {
			[navItem setPrompt:@"Login to this secure proxy server."];
		} else {
			[navItem setPrompt:@"Login to this secure server."];
		}
	} else {
		[navItem setPrompt:nil];
	}
	[navigationBar sizeToFit];
	CGRect f = [[self view] bounds];
	f.origin.y = [navigationBar frame].size.height;
	f.size.height -= f.origin.y;
	[[self tableView] setFrame:f];
}

- (void)show
{
	// Remove all subviews 要显示输入密码的对话框时需要移除其他页面
	UIView *v;
	while ((v = [[[self view] subviews] lastObject])) {
		[v removeFromSuperview];
	}

	// Setup toolbar	放置导航栏及导航栏的item
	UINavigationBar *bar = [[[UINavigationBar alloc] init] autorelease];
	[bar setAutoresizingMask:UIViewAutoresizingFlexibleWidth];

	UINavigationItem *navItem = [[[UINavigationItem alloc] init] autorelease];
	bar.items = [NSArray arrayWithObject:navItem];

	[[self view] addSubview:bar];

	[self showTitle];

	// Setup toolbar buttons
	if ([self type] == ASIProxyAuthenticationType) {
		[navItem setTitle:[[self request] proxyHost]];
	} else {
		[navItem setTitle:[[[self request] url] host]];
	}
	//一个是取消，另一个是登录
	[navItem setLeftBarButtonItem:[[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemCancel target:self action:@selector(cancelAuthenticationFromDialog:)] autorelease]];
	[navItem setRightBarButtonItem:[[[UIBarButtonItem alloc] initWithTitle:@"Login" style:UIBarButtonItemStyleDone target:self action:@selector(loginWithCredentialsFromDialog:)] autorelease]];

	// We show the login form in a table view, similar to Safari's authentication dialog
	[bar sizeToFit];	//设置表格的大小
	CGRect f = [[self view] bounds];
	f.origin.y = [bar frame].size.height;
	f.size.height -= f.origin.y;
	//放置表格
	[self setTableView:[[[UITableView alloc] initWithFrame:f style:UITableViewStyleGrouped] autorelease]];
	[[self tableView] setDelegate:self];
	[[self tableView] setDataSource:self];
	[[self tableView] setAutoresizingMask:UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight];
	[[self view] addSubview:[self tableView]];

	// Force reload the table content, and focus the first field to show the keyboard
	[[self tableView] reloadData];	//第一个输入框作为firstresponse,响应输入
	[[[[[self tableView] cellForRowAtIndexPath:[NSIndexPath indexPathForRow:0 inSection:0]].contentView subviews] objectAtIndex:0] becomeFirstResponder];

	if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) {
		[self setModalPresentationStyle:UIModalPresentationFormSheet];
	}

	[[self presentingController] presentModalViewController:self animated:YES];
}

 

//输入用户名和密码的表格
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    //设定为可重用单元
	UITableViewCell *cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:nil] autorelease];
    //选中时没有效果
	[cell setSelectionStyle:UITableViewCellSelectionStyleNone];
    
	CGRect f = CGRectInset([cell bounds], 10, 10);
	UITextField *textField = [[[UITextField alloc] initWithFrame:f] autorelease];
	[textField setAutoresizingMask:UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight];
	[textField setAutocapitalizationType:UITextAutocapitalizationTypeNone];
	[textField setAutocorrectionType:UITextAutocorrectionTypeNo];

	NSUInteger s = [indexPath section];
	NSUInteger r = [indexPath row];
    //还未输入时提示语“User”和"Password"
	if (s == kUsernameSection && r == kUsernameRow) {
		[textField setPlaceholder:@"User"];
	} else if (s == kPasswordSection && r == kPasswordRow) {
		[textField setPlaceholder:@"Password"];
        //设置为密码输入的textfield
		[textField setSecureTextEntry:YES];
	} else if (s == kDomainSection && r == kDomainRow) {
		[textField setPlaceholder:@"Domain"];
	}
	[cell.contentView addSubview:textField];

	return cell;
}

 

弹出输入用户名、密码对话框的代码

- (void)authenticationNeededForRequest:(ASIHTTPRequest *)theRequest
{
	UIAlertView *alertView = [[[UIAlertView alloc] initWithTitle:@"Please Login" message:[request authenticationRealm] delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:@"OK",nil] autorelease];
	// These are undocumented, use at your own risk!
	// A better general approach would be to subclass UIAlertView, or just use ASIHTTPRequest's built-in dialog
	[alertView addTextFieldWithValue:@"" label:@"Username"];
	[alertView addTextFieldWithValue:@"" label:@"Password"];
	[alertView show];

}