UIDatePicker in UIPopover

问题:

I have searched the entire internet (maybe I am exaggerating a little) for a tutorial on how to put a DatePicker into a UIPopover and display that in an iPad application. I have tried creating a viewcontroller, placing the datepicker in the view controller and then:

self.popover = [[UIPopoverController alloc] initWithContentViewController:sa];

(sa is the name of the viewcontroller i created), but this doesn't work, and the app crashes. Can anyone help?

回答1:

Try with below code. It will work fine:

Objective-C

- (IBAction)showDatePicker:(UIButton *)sender {
    UIDatePicker *datePicker = [[UIDatePicker alloc]init];//Date picker
    datePicker.frame = CGRectMake(0, 0, 320, 216);
    datePicker.datePickerMode = UIDatePickerModeDateAndTime;
    [datePicker setMinuteInterval:5];
    [datePicker addTarget:self action:@selector(dateChanged:) forControlEvents:UIControlEventValueChanged];//need to implement this method in same class


    UIView *popoverView = [[UIView alloc] init];   //view
    popoverView.backgroundColor = [UIColor clearColor];
    [popoverView addSubview:datePicker];
    // here you can add tool bar with done and cancel buttons if required

    UIViewController *popoverViewController = [[UIViewController alloc] init];
    popoverViewController.view = datePicker;
    popoverViewController.view.frame = CGRectMake(0, 0, 320, 216);
    popoverViewController.modalPresentationStyle = UIModalPresentationPopover;
    popoverViewController.preferredContentSize = CGSizeMake(320, 216);
    popoverViewController.popoverPresentationController.sourceView = sender; // source button
    popoverViewController.popoverPresentationController.sourceRect = sender.bounds; // source button bounds
    //popoverViewController.popoverPresentationController.delegate = self;
    [self presentViewController:popoverViewController animated:YES completion:nil];
}
- (void)dateChanged:(UIDatePicker *)datePicker {
    NSLog(@"DATE :: %@", datePicker.date);
}

Swift3

 @IBAction func showDatePicker(_ sender: UIButton) {
        let datePicker = UIDatePicker()//Date picker
        datePicker.frame = CGRect(x: 0, y: 0, width: 320, height: 216)
        datePicker.datePickerMode = .dateAndTime
        datePicker.minuteInterval = 5
        datePicker.addTarget(self, action: #selector(dateChanged(_:)), for: .valueChanged)

        let popoverView = UIView()
        popoverView.backgroundColor = UIColor.clear
        popoverView.addSubview(datePicker)
        // here you can add tool bar with done and cancel buttons if required

        let popoverViewController = UIViewController()
        popoverViewController.view = popoverView
        popoverViewController.view.frame = CGRect(x: 0, y: 0, width: 320, height: 216)
        popoverViewController.modalPresentationStyle = .popover
        popoverViewController.preferredContentSize = CGSize(width: 320, height: 216)
        popoverViewController.popoverPresentationController?.sourceView = sender // source button
        popoverViewController.popoverPresentationController?.sourceRect = sender.bounds // source button bounds
        self.present(popoverViewController, animated: true, completion: nil)

    }
    func dateChanged(_ datePicker: UIDatePicker) {
        print("DATE :: \(datePicker.date)")
    }

回答2:

Now since you have tagged iPhone It can clearly be assumed that you are trying to use UIPopoverController in iPhone But UIPopoverController is available only for iPad. So it is resulting in a crash since iPhone doesn't recognize that controller.