UIPopoverController(Basics)

This is sample of UIPopoverController
UIPopoverController is popup-like dialog.
This is valid on iPad UI. If you use iPhone UI, exception will happen.

Sample

This is just code UI.

PopupViewSampleViewController.h

@interface PopupViewSampleViewController : UIViewController<UIPopoverControllerDelegate>

@end

Please implements UIPopoverControllerDelegate.

PopupViewSampleViewController.m

@interface PopupViewSampleViewController ()
@property (nonatomic) UIPopoverController *popup;
@end

@implementation PopupViewSampleViewController

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

- (void)viewDidLoad
{
    [super viewDidLoad];
	[self.view setBackgroundColor:[UIColor whiteColor]];
    UIButton *button = [[UIButton alloc] initWithFrame:CGRectMake(100, 100, 150, 50)];
    [button setBackgroundColor:[UIColor blueColor]];
    [button setTitle:@"OpenPop" forState:UIControlStateNormal];
    [button addTarget:self action:@selector(openPop:) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:button];
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

#pragma mark - UI Event
-(void)openPop:(id)sender {
    if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) {
        UIViewController *controller = [[UIViewController alloc] init];
        [controller.view setBackgroundColor:[UIColor grayColor]];
        controller.view.frame = CGRectMake(100, 100, 150, 50);
        self.popup = [[UIPopoverController alloc] initWithContentViewController:controller];
        self.popup.popoverContentSize = CGSizeMake(150, 100);
        
        self.popup.delegate = self;
        [self.popup presentPopoverFromRect:CGRectMake(100, 100, 150, 50) inView:self.view permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];
        // UIPopoverArrowDirectionAny
    }
}

#pragma mark - Popover
-(void)popoverControllerDidDismissPopover:(UIPopoverController *)popoverController {
    self.popup = nil;
}
@end

Arrow Direction

This popup has arrow. We can select some types of arrow.

Result

This is only for iPad, in iPhone, no event has happened.