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我使用蘋果的MuiltipleDetailViewController示例應用程序，並得到消息「的UIViewController可能不響應showRootPopoverButtonItem」的UIViewController可能不響應showRootPopoverButtonItem
這XCode中3.X工作，但我得到4.2
消息該應用程序本身功能爲100％，每個筆尖都可以識別彈出窗口，而橫向模式下的左側表格也可識別該彈出窗口。但我無法提交此警告。我需要改變什麼？
RootViewController.h
#import <UIKit/UIKit.h>
/*
SubstitutableDetailViewController defines the protocol that detail view controllers must adopt. The protocol specifies methods to hide and show the bar button item controlling the popover.
*/
@protocol SubstitutableDetailViewController <NSObject>
- (void)showRootPopoverButtonItem:(UIBarButtonItem *)barButtonItem;
- (void)invalidateRootPopoverButtonItem:(UIBarButtonItem *)barButtonItem;
@end
@interface RootViewController : UITableViewController <UISplitViewControllerDelegate> {
UISplitViewController *splitViewController;
UIPopoverController *popoverController;
UIBarButtonItem *rootPopoverButtonItem;
//UINavigationBar *navigationBar;
}
@property (nonatomic, assign) IBOutlet UISplitViewController *splitViewController;
@property (nonatomic, retain) UIPopoverController *popoverController;
@property (nonatomic, retain) UIBarButtonItem *rootPopoverButtonItem;
//@property (nonatomic, retain) IBOutlet UINavigationBar *navigationBar;
@end
RootViewController.m：
#import "RootViewController.h"
#import "WebViewController.h"
#import "Twitter.h"
//#import "SubstitutableDetailViewController.h"
@implementation RootViewController
@synthesize splitViewController, popoverController, rootPopoverButtonItem;//, navigationBar;
#pragma mark -
#pragma mark View lifecycle
- (void)viewDidLoad {
[super viewDidLoad];
// Set the content size for the popover: there are just two rows in the table view, so set to rowHeight*2.
self.contentSizeForViewInPopover = CGSizeMake(310.0, self.tableView.rowHeight*2.0);
//self.navigationController.navigationBar.tintColor = [UIColor colorWithRed:255/255 green:104/255 blue:1/255 alpha:1];
}
/*
-(void)customizeAppearance {
//create resizable images
UIImage *bluImage = [UIImage imageNamed:@"blu.jpg"];// resizableImageWithCapInsets:(0, 0, 0, 0)];
//set the bg for *all* UINavBars
[[UINavigationBar appearance] setBackgroundImage:bluImage forBarMetrics:UIBarMetricsDefault];
}
*/
-(void) viewDidUnload {
[super viewDidUnload];
self.splitViewController = nil;
self.rootPopoverButtonItem = nil;
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
return YES;
}
- (void)splitViewController:(UISplitViewController*)svc willHideViewController:(UIViewController *)aViewController withBarButtonItem:(UIBarButtonItem*)barButtonItem
forPopoverController:(UIPopoverController*)pc {
// Keep references to the popover controller and the popover button, and tell the detail view controller to show the button.
barButtonItem.title = @"Index";
self.popoverController = pc;
self.rootPopoverButtonItem = barButtonItem;
UIViewController <SubstitutableDetailViewController> *detailViewController = [splitViewController.viewControllers objectAtIndex:1];
[detailViewController showRootPopoverButtonItem:rootPopoverButtonItem];
}
- (void)splitViewController:(UISplitViewController*)svc willShowViewController:(UIViewController *)aViewController
invalidatingBarButtonItem:(UIBarButtonItem *)barButtonItem {
// Nil out references to the popover controller and the popover button, and tell the detail view controller to hide the button.
UIViewController <SubstitutableDetailViewController> *detailViewController = [splitViewController.viewControllers objectAtIndex:1];
[detailViewController invalidateRootPopoverButtonItem:rootPopoverButtonItem];
self.popoverController = nil;
self.rootPopoverButtonItem = nil;
}
#pragma mark -
#pragma mark Table view data source
- (NSInteger)tableView:(UITableView *)aTableView numberOfRowsInSection:(NSInteger)section {
// Two sections, one for each detail view controller.
return 2;
}
- (UITableViewCell *)tableView:(UITableView *)aTableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = @"RootViewControllerCellIdentifier";
// Dequeue or create a cell of the appropriate type.
UITableViewCell *cell = [self.tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
//cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier] autorelease];
}
// Set appropriate labels for the cells.
if (indexPath.row == 0) {
cell.textLabel.text = @"Twitter";
}
else if (indexPath.row == 1) {
cell.textLabel.text = @"Contact Us";
}
cell.textLabel.textColor = [UIColor whiteColor];
cell.textLabel.backgroundColor = [UIColor blackColor];
cell.contentView.backgroundColor = [UIColor blackColor];
cell.detailTextLabel.backgroundColor = [UIColor blackColor];
return cell;
}
#pragma mark -
#pragma mark Table view selection
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
/*
Create and configure a new detail view controller appropriate for the selection.
*/
NSUInteger row = indexPath.row;
UIViewController *detailViewController = nil;
if (row == 0) {
Twitter *newDetailViewController = [[Twitter alloc]
initWithNibName:@"Twitter"
bundle:nil];
detailViewController = newDetailViewController;
}
if (row == 1) {
WebViewController *newDetailViewController = [[WebViewController alloc]
initWithNibName:@"WebViewController"
bundle:nil];
newDetailViewController.detailURL=
[[NSURL alloc] initWithString:@"http://www.chipmunkmobile.com/contact.html"];
detailViewController = newDetailViewController;
}
// Update the split view controller's view controllers array.
NSArray *viewControllers = [[NSArray alloc] initWithObjects:self.navigationController, detailViewController, nil];
splitViewController.viewControllers = viewControllers;
[viewControllers release];
// Dismiss the popover if it's present.
if (popoverController != nil) {
[popoverController dismissPopoverAnimated:YES];
}
// Configure the new view controller's popover button (after the view has been displayed and its toolbar/navigation bar has been created).
if (rootPopoverButtonItem != nil) {
[detailViewController showRootPopoverButtonItem:self.rootPopoverButtonItem];
}
[detailViewController release];
}
#pragma mark -
#pragma mark Managing the popover
/*
- (void)showRootPopoverButtonItem:(UIBarButtonItem *)barButtonItem {
// Add the popover button to the left navigation item.
[navigationBar.topItem setLeftBarButtonItem:barButtonItem animated:NO];
}
- (void)invalidateRootPopoverButtonItem:(UIBarButtonItem *)barButtonItem {
// Remove the popover button.
[navigationBar.topItem setLeftBarButtonItem:nil animated:NO];
}
*/
#pragma mark -
#pragma mark Memory management
- (void)dealloc {
[popoverController release];
[rootPopoverButtonItem release];
[super dealloc];
}
@end
這裏是確切的線在那裏我得到警告 
你有這種方法註釋掉了......你期望發生什麼？ – 2012-02-08 21:53:30