uipopover與uidatepicker代理不起作用

Question

我創建了一個彈出式按鈕時彈出的故事板中的datepicker。在選擇日期並按下完成按鈕後，日期必須發送至UIViewController。

我已經設置了協議和委託方法，如uidatepicker in uipopover delegate所解釋的，但我的viewcontroller中的委託方法從未調用。我錯過了什麼嗎？我需要爲此使用segues嗎？請幫忙！！

- (IBAction)doneButtonPress:(UIBarButtonItem *)sender { 
    NSLog(@"donebuttonpress"); 
    [_delegate receiveDate:pickedDate]; 
    NSLog(@"afterdelegation"); 
} 

兩者donebuttonpress和afterdelegation進行打印，但是該方法從未被稱爲:(

//selectDatePopover.h

#import <UIKit/UIKit.h> 
@protocol selectDatePopoverDelegate <NSObject> 
    - (void)receiveDate:(NSString *)theDate; 
@end 

@interface selectDatePopover : UIViewController{ 
    id <selectDatePopoverDelegate> delegate; 
} 

@property (nonatomic, assign) id <selectDatePopoverDelegate> delegate; 
- (IBAction)doneButtonPress:(UIBarButtonItem *)sender; 
- (IBAction)mydatepicker:(UIDatePicker *)sender; 
@end 

//selectDatePopover.m

- (IBAction)doneButtonPress:(UIBarButtonItem *)sender { 
    NSLog(@"donebuttonpress"); 
    NSLog(_delegate); 
    [_delegate receiveDate:pickedDate]; 
    NSLog(@"afterdelegation"); 
} 

- (IBAction)mydatepicker:(UIDatePicker *)sender { 
    NSDateFormatter *formatter = [[NSDateFormatter alloc] init]; 
    [formatter setDateFormat:@"yyyy-MM-dd"]; 
    pickedDate = [formatter stringFromDate:[sender date]]; 
    NSLog(pickedDate); 
} 

//CheckIn_ViewController.h

#import "selectDatePopover.h" 
@interface CheckIn_ViewController : UIViewController <selectDatePopoverDelegate> 
    @property UIPopoverController *popover; 
@end 

//CheckIn_ViewController.m

- (void)receiveDate:(NSString *)theDate { 
    NSLog(@"backhere"); 
    dateLabel.Text = theDate; 
} 

//在此按鈕的新聞，酥料餅有露面：

- (IBAction)calendarbutton:(UIButton *)sender { 
    UIView *anchor = sender; 
    selectDatePopover *selectDatePopoverInstance = 
    [self.storyboard instantiateViewControllerWithIdentifier:@"selectDatePopover"]; 
    _popover = [[UIPopoverController alloc] initWithContentViewController:selectDatePopoverInstance]; 
    [_popover presentPopoverFromRect:anchor.frame 
         inView:anchor.superview 
     permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES]; 

    selectDatePopoverInstance.delegate = self; 
} 

Answer 1

這條線：self.popover.delegate =自;是不正確的。委託協議不在popover類中，它在其內容視圖控制器中，即selectDatePopover。因此，將該行更改爲：

selectDatePopover.delegate = self;