用 UIPopoverController 弹出 UITableView

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////  LanguageListController.h//  MyPresidents2////  Created by Wunderman on 12-1-30.//  Copyright (c) 2012年 __MyCompanyName__. All rights reserved.//#import <UIKit/UIKit.h>#import "DetailViewController.h"@interface LanguageListController : UITableViewController {    DetailViewController *detailViewController;    NSArray *languageNames;    NSArray *languageCodes;    }@property(nonatomic, assign) DetailViewController *detailViewController;@property(nonatomic, retain) NSArray *languageNames;@property(nonatomic, retain) NSArray *languageCodes;@end

////  LanguageListController.m//  MyPresidents2////  Created by Wunderman on 12-1-30.//  Copyright (c) 2012年 __MyCompanyName__. All rights reserved.//#import "LanguageListController.h"@implementation LanguageListController@synthesize detailViewController = _detailViewController;@synthesize languageNames = _languageNames;@synthesize languageCodes = _languageCodes;- (void)viewDidLoad {    self.languageNames = [NSArray arrayWithObjects:@"Englist", @"French", @"German", @"Spanish", nil];    self.languageCodes = [NSArray arrayWithObjects:@"en", @"fr", @"de", @"es", nil];        self.clearsSelectionOnViewWillAppear = NO;    self.contentSizeForViewInPopover = CGSizeMake(320.0, [self.languageCodes count] * 44.0);    }- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {    return 1;}- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {    return [self.languageCodes count];}- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {    static NSString *CellIdentifier = @"Cell";        UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];    if (cell == nil) {        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];    }        // Configure the cell...    cell.textLabel.text = [self.languageNames objectAtIndex:[indexPath row]];    return cell;}- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {    self.detailViewController.languageString = [self.languageCodes objectAtIndex: indexPath.row];    }- (void)viewDidUnload {    self.detailViewController = nil;    self.languageNames = nil;    self.languageCodes = nil;}- (void)dealloc {    [self.detailViewController release];    [self.languageNames release];    [self.languageCodes release];    [super dealloc];}@end

- (IBAction)touchLanguageButton:(id)sender {       if (self.languagePopoverController.popoverVisible == NO) {                LanguageListController *languageListController = [[LanguageListController alloc]                                                          init];        languageListController.detailViewController = self;        UIPopoverController *poc = [[UIPopoverController alloc]                                    initWithContentViewController:languageListController];        [poc presentPopoverFromBarButtonItem:self.languageButton                     permittedArrowDirections:UIPopoverArrowDirectionAny                                     animated:YES];        self.languagePopoverController = poc;        //[poc release]; 如果release ，点击四次后就抛错误。Current language:  auto; currently objective-c        [languageListController release];            } else {        [self.languagePopoverController dismissPopoverAnimated:YES];    }}

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