UIViewController 可能无法响应 showRootPopoverButtonItem
我正在使用Apple的MuiltipleDetailViewController示例应用程序并收到消息“UIViewController可能不会响应showRootPopoverButtonItem”
这在XCode 3.X中有效,但我在4.2中收到消息
应用程序本身功能100%,弹出窗口在每个笔尖中都被识别,如是横向模式下左侧的表格。但我无法带着这个警告提交。我需要改变什么??
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
这是我收到警告的确切行的图像
I am using Apple's MuiltipleDetailViewController sample app and get the message "UIViewController may not respond to showRootPopoverButtonItem"
This worked in XCode 3.X, but I get the message with 4.2
The app itself functions 100%, the popover is recognized in every nib, as is the table on the left when in landscape mode. But I can't submit with this warning. What do I need to change??
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
Here is an image of the exact line where I get the warning
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您收到此警告的原因是因为此
UIViewController *detailViewController
UIViewController 没有名为“showRootPopoverButtonItem”的方法。如果你想摆脱警告,只需这样做:或者
你只需要让它知道它不仅仅是一个viewController,它是你创建的一个子类viewController。因此,无论 showRootPopoverButtonItem: 类是什么,您只需要键入它即可。
The reason you getting this warning is because of this
UIViewController *detailViewController
UIViewController does not have a method called "showRootPopoverButtonItem". If you want to get rid of the warning just do this instead:or
You just need to let it know its not really just a viewController, its a subclassed viewController you created. So what ever class showRootPopoverButtonItem: is in you just need to type cast it.
如果您想让您的代码完全相同但消除警告,您可以这样做。
如果你想更加小心,你应该使用这个。
更新
阅读完代码后,您可以像在其他函数中一样在detailViewController上指定委托。
If you want to leave your code exactly the same but get rid of the warning you can do this.
If you want to be more careful you should use this.
Update
After reading through your code you could just specify the delegate on the detailViewController like you did in the other functions.
(1)指定detailedViewController的Type: [(TYPE *)OBJECTNAME...
(2) 然后指定方法调用 [(TYPE *)OBJECTNAME METHODCALL];
(*) 您收到警告是因为编译器不知道您正在使用什么类型的对象。如果您子类化 UIViewController 那么您必须在访问方法时指定类型。确保该方法位于 .h 中,以便您可以访问它。
(1)Specify the Type for the detailedViewController: [(TYPE *)OBJECTNAME...
(2) Then Specify method call [(TYPE *)OBJECTNAME METHODCALL];
(*) You get the warning because the compiler does not know what type of object you are using. If you subclass a UIViewController then you have to specify type when accessing methods.Make sure the method is in .h so that you can access it.