objective-c - 如何从 Popover 中的按钮关闭 UIPopover

Question

我试图从 Popover 中的按钮关闭 UIPopoverViewControler。此外，我希望它将数据传输回主视图。我让它适用于 modalViewController 但不适用于 Popover。有谁知道我怎样才能做到这一点？

//弹出框

- (IBAction) save:(id)sender
{
    if ([self startDateIsValid] && [self endDateIsValid]) 
    {

        [[self parentViewController] setDatesForEvent:startDate eventEndDate:endDate allDay:[allDaySwitch isOn]];
        [self dismissModalViewControllerAnimated:YES];

    }

}

//AddEventViewController_iPad

#import <UIKit/UIKit.h>
#import <Foundation/Foundation.h>
#import "dateViewPopOverViewController_iPad.h"
@interface AddEventViewController_iPad : UIViewController <UITableViewDelegate,UITableViewDataSource, MFMailComposeViewControllerDelegate, UITextFieldDelegate,  UIAlertViewDelegate,UIPopoverControllerDelegate,UINavigationControllerDelegate,UIPopoverControllerDelegate,ABPeoplePickerNavigationControllerDelegate, ABNewPersonViewControllerDelegate,DismissPopoverDelegate> {

//日期弹出框

#import <UIKit/UIKit.h>
#import "AddEventViewController_iPad.h"
@protocol DismissPopoverDelegate <NSObject>

- (void) dismissWithData:(NSString *)data;

@end

@interface dateViewPopOverViewController_iPad : UIViewController<UIPopoverControllerDelegate> {

Answer 1

想法很简单。 YourViewController - 它是 UIPopoverController 的 viewController . MainViewController - 创建的 Controller UIPopoverController

1. 在 YourViewController 中声明协议(protocol)用解雇方法
2. 声明 id<DismissDelegateProtocol> 类型的属性在 YourViewController
3. 声明支持DismissDelegateProtocol在 MainViewController
4. 实现 DismissDelegateProtocol 的关闭方法在 MainViewController
5. 当您创建 YourViewController在 MainViewController设置委托(delegate)属性 ( yourViewController.delegate = self; )
6. 实际上，对按钮触摸调用委托(delegate)方法的响应:[self.delegate dismissWithData:dataToTransfer];

在代码中应该是这样的:

在 MainViewController.h 中:

#import "YourViewController.h"
@class MainViewController: UIViewController < DismissPopoverDelegate >

在MainViewController.m中:

- (void) dismissPopover:(NSObject *)yourDataToTransfer
{ /* Dismiss you popover here and process data */ }

...
// Some method, when you create popover
{
    YourViewController *vc = ... ;
    vc.delegate = self; // this delegate property should be declared as assign
}

在 YourViewController.h 中:

@protocol DismissPopoverDelegate
- (void) dismissPopover:(NSObject *)yourDataToTransfer;
@end

@class YourViewController : UIViewController
{
    id<DismissPopoverDelegate> delegate;
}

@property (nonatomic, assign) id<DismissPopoverDelegate> delegate;

在 YourViewController.m 中:

- (void) methodWhenYouWantToDismissPopover
{
    [self.delegate dismissPopover:data];
}