iOS UIPopoverControllerデリゲートが機能しない、残っていない

Question

初めてのポスターの長い時間のリーダー。

私はいくつかのチュートリアル/例/答えなどを試して、popoverController内のキャンセルボタンを使用して、デリゲートメソッドを使用してポップオーバー（それ自体）を却下しました。私は運がなかったし、私は立ち往生している。以下は、関連するコードスニペットです。

私はcancelButtonPushedメソッドが正常に呼び出されていますが、私のゴールデンメソッド "didClickCancelButton"は決して呼び出されていないことを知っています。

洞察？ここで

は私が持っているものです。

// 
// MIPracticeAreasFilterViewController.h 
// 

#import <UIKit/UIKit.h> 

@protocol MyPopoverDelegate 
-(void)didClickCancelButton; 
@end 

@interface MIPracticeAreasFilterViewController : UITableViewController { 
    //other vars 
    id <MyPopoverDelegate> delegate; 

} 

//other properties 
@property (nonatomic, assign) id <MyPopoverDelegate> delegate; 

//other methods  
-(IBAction)cancelButtonPush:(id)sender; 

@end 


// 
// MIPracticeAreasFilterViewController.m 
// 

#import "MIPracticeAreasFilterViewController.h" 

@interface MIPracticeAreasFilterViewController() 
    -(UITableViewCell *)buttonCellForTableView:(UITableView*)tableView; 
    -(UITableViewCell *)submitOrCancelCellForTableView:(UITableView*)tableView; 
@end 

@implementation MIPracticeAreasFilterViewController 
@synthesize practiceAreas=_practiceAreas; 
@synthesize selectedPracticeAreas=_selectedPracticeAreas; 
@synthesize delegate; 

- (id)initWithStyle:(UITableViewStyle)style 
{ 
    //init stuff 
} 

- (void)dealloc 
{ 

} 

- (void)didReceiveMemoryWarning 
{ 

} 

-(IBAction)cancelButtonPush:(id)sender 
{ 
    if (self.delegate == nil) 
    { 
     NSLog(@"Delegate is nil. Cancel button pushed."); 
    } 
    //[[self delegate] didClickCancelButton]; 
    [self.delegate didClickCancelButton]; 

} 

- (UITableViewCell *)submitOrCancelCellForTableView:(UITableView *)tableView 
{ 
    static NSString *CellIdentifier = @"PracticeAreaSubmitOrCancelCell"; 

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier]; 
    if (cell == nil) 
    { 
     cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease]; 
    } 

    cell.selectionStyle = UITableViewCellSelectionStyleNone; 

    NSUInteger buttonSpace = 10; 
    NSUInteger buttonWidth = 120; 
    NSUInteger buttonHeight = 34; 
    NSUInteger buttonStartX = 80; 
    NSUInteger buttonY = 4; 

    UIButton *cancelButton = [UIButton buttonWithType:UIButtonTypeRoundedRect]; 
    [cancelButton addTarget:self action:@selector(cancelButtonPush:) forControlEvents:UIControlEventTouchUpInside]; 
    cancelButton.frame = CGRectMake(buttonStartX + buttonWidth*1 + buttonSpace*1, buttonY, buttonWidth, buttonHeight); 
    [cancelButton setTitle:@"Cancel" forState:UIControlStateNormal]; 
    [cell.contentView addSubview:cancelButton]; 

    return cell; 
} 

#pragma mark - Table view delegate 

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath 
{ 
    if (indexPath.row == 0) { 
     //clicked the "select" cell, all the handlers are their responsibility. 
     return; 
    } 

    if (indexPath.row == 1) { 
     //clicked the "submit or cancel" cell, all the handlers are their responsibility. 
     return; 
    } 

    NSString *practiceArea = [_practiceAreas objectAtIndex:indexPath.row-2]; 

    if ([_selectedPracticeAreas containsObject:practiceArea]) { 
     //remove the object 
     [_selectedPracticeAreas removeObject:practiceArea]; 
    } else { 
     [_selectedPracticeAreas addObject:practiceArea]; 
    } 
    [tableView reloadData]; 
} 

@end 

そして、ここではpopoverControllerを作成するビューコントローラである：

// 
// MIRootViewController.h 
// 

#import <UIKit/UIKit.h> 
#import "MILandingPageViewController.h" 
#import "MIPracticeAreasFilterViewController.h" 
#import "MILoginViewController.h" 

@interface MIRootViewController : UIViewController <UIPopoverControllerDelegate, UITextFieldDelegate, MILoginCompleteDelegate, MIInterfaceOrientationDelegate, UINavigationControllerDelegate, MyPopoverDelegate> 
{ 
    //other objects 

    UIPopoverController *_practiceAreasPopoverController; 
    MIPracticeAreasFilterViewController *_practiceAreasFilterViewController; 

} 

//other properties 
@property (nonatomic, readwrite, retain) UIPopoverController *practiceAreasPopoverController; 
@property (nonatomic, readwrite, retain) MIPracticeAreasFilterViewController *practiceAreasFilterViewController; 

//other methods 
- (void) didClickCancelButton; 

@end 

// 
// MIRootViewController.m 
// 

#import "MIRootViewController.h" 
#import "HLReachability.h" 
#import "MILoginStatusManager.h" 
#import "MITextInsightDataUpdater.h" 

@interface MIRootViewController() 

//other methods 
- (void)didClickCancelButton; 

@end 

@implementation MIRootViewController 

@synthesize practiceAreasPopoverController = _practiceAreasPopoverController; 
@synthesize practiceAreasFilterViewController = _practiceAreasFilterViewController; 

- (void)dealloc 
{ 
    //stuff 
    [super dealloc]; 
} 

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil 
{ 
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]; 
    if (self) 
    { 
     [self initialize]; 
    } 
    return self; 
} 

- (void)initialize 
{ 

    [[MIAppModel sharedInstance] preloadImages]; 

    _practiceAreasFilterViewController = [[MIPracticeAreasFilterViewController alloc] initWithStyle:UITableViewStylePlain]; 
    _practiceAreasPopoverController = [[UIPopoverController alloc] initWithContentViewController:_practiceAreasFilterViewController]; 
    _practiceAreasPopoverController.popoverContentSize = CGSizeMake(400, 900); 
    _practiceAreasPopoverController.delegate = self; 

} 

#pragma mark MyPopover delegate 

-(void)didClickCancelButton 
{ 
    NSLog(@"Success! Clicked Cancel from ROOT VIEW"); 

    if ([_practiceAreasPopoverController isPopoverVisible]) 
    { 
     [_practiceAreasPopoverController dismissPopoverAnimated:YES]; 
     [_practiceAreasPopoverController release]; 
    }  
} 

- (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation 
{ 
    //bring back the popover if it was visible before the rotation 
    if (_practiceAreasPopoverControllerWasVisible) 
    { 
     CGRect popoverFrame = _practiceAreasButton.superview.frame; 
     popoverFrame.origin.x += _practiceAreasButton.frame.origin.x; 
     popoverFrame.origin.y += _practiceAreasButton.frame.origin.y; 
     popoverFrame.size = _practiceAreasButton.frame.size; 
     popoverFrame.size.height = _practiceAreasButton.frame.size.height; 
     [_practiceAreasPopoverController presentPopoverFromRect:popoverFrame inView:self.view permittedArrowDirections:UIPopoverArrowDirectionDown animated:NO]; 
    } 
    [_navController didRotateFromInterfaceOrientation:fromInterfaceOrientation]; 
} 

- (void)willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration 
{ 
    _practiceAreasPopoverControllerWasVisible = [_practiceAreasPopoverController isPopoverVisible]; 
    if (_practiceAreasPopoverControllerWasVisible) { 
     //hide it before the rotation 
     [_practiceAreasPopoverController dismissPopoverAnimated:NO]; 
    } 
    [_navController willAnimateRotationToInterfaceOrientation:toInterfaceOrientation duration:duration]; 
} 

#pragma mark - Actions 

- (IBAction) practiceAreasTouch:(id)sender 
{ 
    [_searchInput resignFirstResponder]; 
    [_practiceAreasPopoverController setDelegate:self]; 
    if (![_practiceAreasPopoverController isPopoverVisible]) { 
     //show the popover 
     CGRect popoverFrame = _practiceAreasButton.superview.frame; 
     popoverFrame.origin.x += _practiceAreasButton.frame.origin.x; 
     popoverFrame.origin.y += _practiceAreasButton.frame.origin.y; 
     popoverFrame.size = _practiceAreasButton.frame.size; 
     popoverFrame.size.height = _practiceAreasButton.frame.size.height; 
     [_practiceAreasPopoverController presentPopoverFromRect:popoverFrame inView:self.view permittedArrowDirections:UIPopoverArrowDirectionDown animated:YES]; 
    } 
    else 
    { 
     [_practiceAreasPopoverController dismissPopoverAnimated:NO]; 
    } 
} 

#pragma mark - Practice Areas Filter PopoverControllerDelegate 
- (void) popoverControllerDidDismissPopover:(UIPopoverController *)popoverController { 
    if ([_searchInput.text isEqualToString:@""]) { 
     //just use the insights 
     _landingPageController.textInsights = [[MIAppModel sharedInstance] textInsightsForTopics:_practiceAreasFilterViewController.selectedTopics ]; 
    } 
    else 
    { 
     //filter by search as well 
     _landingPageController.textInsights = [[MIAppModel sharedInstance] textInsightsForTopics:_practiceAreasFilterViewController.selectedTopics matchingSearch:_searchInput.text ]; 
    } 
    [self showBackButtonAnimated:YES]; 
    _filterOn = YES; 
    [_landingPageController.layoutView reloadDataWithInterfaceOrientation:self.interfaceOrientation]; 
} 

@end 

Answer 1

私はこれを捕らえたはずです。私は私のpopControllerではなく、私のviewController上にデリゲートを設定する必要がありました。

_practiceAreasFilterViewController.delegate = self; 

の代わりに、応答のための

_practiceAreasPopoverController.delegate = self; 

Answer 2

initでinitializeを交換してください。

+(void) initializeメソッドは、Objective-Cがプログラムを起動するときに呼び出され、すべてのクラスに対して呼び出されます。 （here参照）。

これは、新しいオブジェクトを初期化するときに呼び出されるメソッドではなく、init（またはその任意の変形、 `initWith ...）です。したがって、デリゲートが設定されていない理由を説明する必要があります。