Use of presentation Controllers, controllers

Use of presentation Controllers, controllers
Presentation Controllers usage by Wu xueying

@interface ViewController ()<UIPopoverPresentationControllerDelegate, UIAdaptivePresentationControllerDelegate>@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];}- (IBAction)show:(id)sender {    UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Main" bundle:nil];    TestViewController *contentViewController = [storyboard instantiateViewControllerWithIdentifier:NSStringFromClass([TestViewController class])];    contentViewController.modalPresentationStyle = UIModalPresentationPopover;    UIPopoverPresentationController *detailPopover = contentViewController.popoverPresentationController;    detailPopover.delegate = self;    detailPopover.barButtonItem = sender;    detailPopover.permittedArrowDirections = UIPopoverArrowDirectionAny;    [self presentViewController:contentViewController animated:YES completion:nil];}- (UIModalPresentationStyle)adaptivePresentationStyleForPresentationController:(UIPresentationController *)controller {    return UIModalPresentationNone;}- (UIViewController *)presentationController:(UIPresentationController *)controller viewControllerForAdaptivePresentationStyle:(UIModalPresentationStyle)style {    UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:controller.presentedViewController];    return navController;}