Objective c 代表不工作

我正在尝试关闭一个popover，同时传输数据。我实现了一个委托DismissPopoverDelegate，但它无法工作。但是没有错误。如果点击save（保存）按钮，则会将其注册，并在调用委托后完成该行。但它不起作用

AddEventViewController_iPad.h

#import <UIKit/UIKit.h>
#import <AddressBook/AddressBook.h>
#import <AddressBookUI/AddressBookUI.h>
#import <EventKit/EventKit.h>
#import <EventKitUI/EventKitUI.h>
#import <MessageUI/MessageUI.h>
#import <MessageUI/MFMailComposeViewController.h>
#import <Foundation/Foundation.h>
#import "AboutSme.h"
#import "dateViewPopOverViewController_iPad.h"
#import "addPersonViewControllerPopover_iPad.h"
#import "PreviousEventsTableViewControllerPopover_iPad.h"

@interface AddEventViewController_iPad : UIViewController <UITableViewDelegate, UITableViewDataSource, MFMailComposeViewControllerDelegate, UITextFieldDelegate, UIAlertViewDelegate,UIPopoverControllerDelegate,UINavigationControllerDelegate,UIPopoverControllerDelegate,ABPeoplePickerNavigationControllerDelegate, ABNewPersonViewControllerDelegate, DismissPopoverDelegate> {
UIPopoverController *pop;

#import <UIKit/UIKit.h>
#import <Foundation/Foundation.h>
@protocol DismissPopoverDelegate <NSObject>
@required
- (void) dismissWithData:(NSString *)data;

@end
@interface dateViewPopOverViewController_iPad : UIViewController {
IBOutlet UIDatePicker *datePicker;
IBOutlet UISegmentedControl *segmentedBar;
IBOutlet UILabel *startLabel;
IBOutlet UILabel *endLabel;
IBOutlet UISwitch *allDaySwitch;
NSDate *startDate;
NSDate *endDate;    
NSDate *now;
NSDateFormatter *dateFormatter;
id<DismissPopoverDelegate> delegate;
}

@property (retain) id delegate;
- (void) dismissWithData:(NSString *)data;



dateViewPopOverViewController_iPad.m

    @implementation dateViewPopOverViewController_iPad

    @synthesize startDate, endDate, datePicker, segmentedBar, startLabel, endLabel, now, allDaySwitch, delegate;

  - (IBAction) save:(id)sender {
    if ([self startDateIsValid] && [self endDateIsValid]) {
        //[[self parentViewController] setDatesForEvent:startDate eventEndDate:endDate allDay:[allDaySwitch isOn]];
  //  [self dismissModalViewControllerAnimated:YES];
        NSLog(@"works");
       [self.delegate dismissWithData:@"Some text from popover"];
  NSLog(@"works1");
    } else {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Ooops!" message:@"Please check the dates! Remember the end date must occur after the start date for the event to save." delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
        [alert show];
        [alert release];
    }
}

dateViewPopOverViewController_iPad.h

#import <UIKit/UIKit.h>
#import <AddressBook/AddressBook.h>
#import <AddressBookUI/AddressBookUI.h>
#import <EventKit/EventKit.h>
#import <EventKitUI/EventKitUI.h>
#import <MessageUI/MessageUI.h>
#import <MessageUI/MFMailComposeViewController.h>
#import <Foundation/Foundation.h>
#import "AboutSme.h"
#import "dateViewPopOverViewController_iPad.h"
#import "addPersonViewControllerPopover_iPad.h"
#import "PreviousEventsTableViewControllerPopover_iPad.h"

@interface AddEventViewController_iPad : UIViewController <UITableViewDelegate, UITableViewDataSource, MFMailComposeViewControllerDelegate, UITextFieldDelegate, UIAlertViewDelegate,UIPopoverControllerDelegate,UINavigationControllerDelegate,UIPopoverControllerDelegate,ABPeoplePickerNavigationControllerDelegate, ABNewPersonViewControllerDelegate, DismissPopoverDelegate> {
UIPopoverController *pop;

#import <UIKit/UIKit.h>
#import <Foundation/Foundation.h>
@protocol DismissPopoverDelegate <NSObject>
@required
- (void) dismissWithData:(NSString *)data;

@end
@interface dateViewPopOverViewController_iPad : UIViewController {
IBOutlet UIDatePicker *datePicker;
IBOutlet UISegmentedControl *segmentedBar;
IBOutlet UILabel *startLabel;
IBOutlet UILabel *endLabel;
IBOutlet UISwitch *allDaySwitch;
NSDate *startDate;
NSDate *endDate;    
NSDate *now;
NSDateFormatter *dateFormatter;
id<DismissPopoverDelegate> delegate;
}

@property (retain) id delegate;
- (void) dismissWithData:(NSString *)data;



dateViewPopOverViewController_iPad.m

    @implementation dateViewPopOverViewController_iPad

    @synthesize startDate, endDate, datePicker, segmentedBar, startLabel, endLabel, now, allDaySwitch, delegate;

  - (IBAction) save:(id)sender {
    if ([self startDateIsValid] && [self endDateIsValid]) {
        //[[self parentViewController] setDatesForEvent:startDate eventEndDate:endDate allDay:[allDaySwitch isOn]];
  //  [self dismissModalViewControllerAnimated:YES];
        NSLog(@"works");
       [self.delegate dismissWithData:@"Some text from popover"];
  NSLog(@"works1");
    } else {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Ooops!" message:@"Please check the dates! Remember the end date must occur after the start date for the event to save." delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
        [alert show];
        [alert release];
    }
}

#导入
#进口
@协议解除
@必需的
-（void）dismissWithData:（NSString*）数据；
@结束
@接口dateViewPopOverViewController\u iPad:UIViewController{
IBUIDatePicker*日期选择器；
IBUI分段控制*分段条；
IBUILabel*Abel；
IBUILabel*endLabel；
IBUISwitch*全天开关；
NSDate*起始日期；
NSDate*endDate；
NSDate*现在；
NSDateFormatter*日期格式化程序；
id代表；
}
@属性（保留）id委托；
-（void）dismissWithData:（NSString*）数据；
dateViewPopOverViewController_iPad.m
@实施日期查看PopOverview控制器
@合成startDate、endDate、datePicker、segmentedBar、StartAbel、endLabel、now、allDaySwitch、delegate；
-（iAction）保存：（id）发件人{
如果（[self-startDateIsValid]&&[self-endDateIsValid]）{
//[[self-parentViewController]setDatesForEvent:startDate eventEndDate:endDate allDay:[allDaySwitch]；
//[自我解散Modalviewcontrolleranimated:是]；
NSLog（“工程”）；
[self.delegate dismissWithData:@“popover中的一些文本”]；
NSLog（“工作1”）；
}否则{
UIAlertView*alert=[[UIAlertView alloc]initWithTitle:@“oops！”消息：@“请检查日期！记住结束日期必须在事件保存的开始日期之后。”委托：自取消按钮：@“确定”其他按钮：nil]；
[警报显示]；
[警报发布]；
}
}

在包含.h文件时，您有一个循环引用

dateViewPopOverViewController_iPad.h

包括

AddEventViewController_iPad.h

和

AddEventViewController_iPad.h

包括

dateViewPopOverViewController_iPad.h

，这将导致编译器引发错误

---

使用协议的目的之一是避免这种循环引用。从您的

AddEventViewController\u iPad.h

文件中删除

DateViewPopOveranimated

包含可能会解决此问题

您对

dismissPopoverAnimated

的调用不会触发对代理的调用。来自苹果的

UIPopoverDelegate

文档：

---

popover控制器不调用此方法来响应对

dismissPopoOveranimated

方法的编程调用。如果以编程方式取消POOVER，则应在调用

dismissPopoverAnimated

方法后立即执行任何清理操作。

仅指出，不应保留委托。您应该将其属性设置为assign，以避免循环引用（这将导致内存泄漏）。检查这篇文章中的答案，确定它消除了一些错误，但仍然有一个错误找不到协议声明…现在是时候在方法中放置一些日志，看看流中哪个没有被调用。不要只说“它不起作用”，因为它不能为人们提供足够的信息来帮助你？日志结果是什么？在创建dateViewPopOverViewController\u iPad对象后，是否设置过该对象的委托属性？哪一行？对不起，但是你必须少用简洁的语言，或者把你的句子改得更好。。。你没有清晰地表达自己上周你问了几乎相同的问题，并在上接受了答案。看一看代码并检查类似的地方

vc.delegate=self。只是一个附加组件。尝试始终将委托属性用作具有正确类型的assign，如
@property（assign）id delegate
，还要检查委托是否不为null，以及它是否响应要调用的选择器
if（[self.delegate&&[self.delegate respondsToSelector:@selector（dismissWithData:）））{[self.delegate dismissWithData:@“popover中的某些文本”；}