Basic use of Popover for iOS ipad Development

Basic use of Popover for iOS ipad Development

 

I:

Ii. Note:

For method [UIPopoverController dealloc] reached while popover is still visible.
When the popover is still displayed, it crashes.
The popover cannot be suspended when it is displayed.
Popover must be suspended when it disappears

Iii. Core code

-(IBAction) popMenu :( id) item {// 0. content: MenuViewController * menu = [[MenuViewController alloc] init]; // 1. create a UIPopover UIPopoverController * popover = [[UIPopoverController alloc] initWithContentViewController: [[UINavigationController alloc] initWithRootViewController: menu]; // 2. set the size // popover. popoverContentSize = CGSizeMake (320, 44*5); // 3. where to display --> point to item [popover presentPopoverFromBarButtonItem: item permittedArrowDirections ctions: UIPopoverArrowDirectionAny animated: YES]; self. popover = popover ;}

Iv. display all code ViewController

# Import ViewController. h # import MenuViewController. h @ interface ViewController ()-(IBAction) popMenu :( id) item; @ property (nonatomic, strong) UIPopoverController * popover; @ end @ implementation ViewController-(void) viewDidLoad {[super viewDidLoad];} //-[UIPopoverController dealloc] reached while popover is still visible. // when the popover is still displayed, it is suspended // it does not allow the popover to be suspended when it is still displayed // the popover must be suspended when it disappears/*** pop-up Popover menu */-(IBAction) popMenu :( id) item {// 0. content: MenuViewController * menu = [[MenuViewController alloc] init]; // 1. create a UIPopover UIPopoverController * popover = [[UIPopoverController alloc] initWithContentViewController: [[UINavigationController alloc] initWithRootViewController: menu]; // 2. set the size // popover. popoverContentSize = CGSizeMake (320, 44*5); // 3. where to display --> point to item [popover presentPopoverFromBarButtonItem: item permittedArrowDirections ctions: UIPopoverArrowDirectionAny animated: YES]; self. popover = popover;} @ end

MenuViewController

# Import MenuViewController. h @ interface MenuViewController () @ property (nonatomic, strong) NSArray * titles; @ end @ implementation MenuViewController-(void) viewDidLoad {[super viewDidLoad]; self. titles = @ [@ set, @ clear cache, @ exit, @ basic info]; self. title = @ menu; self. view. backgroundColor = [UIColor blueColor]; CGFloat w = 320; CGFloat h = self. titles. count * 44; self. preferredContentSize = CGSizeMake (w, h); // self. ContentSizeForViewInPopover = CGSizeMake (w, h) ;}# pragma mark-Table view data source-(NSInteger) tableView :( UITableView *) tableView numberOfRowsInSection :( NSInteger) section {return self. titles. count;}-(UITableViewCell *) tableView :( UITableView *) tableView cellForRowAtIndexPath :( NSIndexPath *) indexPath {static NSString * ID = @ cell; UITableViewCell * cell = [tableView dequeueReusableCellWithIdentif Ier: ID]; if (! Cell) {cell = [[UITableViewCell alloc] initWithStyle: UITableViewCellStyleSubtitle reuseIdentifier: ID];} cell. textLabel. text = self. titles [indexPath. row]; return cell;}-(void) tableView :( UITableView *) tableView didSelectRowAtIndexPath :( NSIndexPath *) indexPath {UIViewController * vc = [[UIViewController alloc] init]; vc. view. backgroundColor = [UIColor redColor]; [self. navigationController pushViewController: vc animated: YES];} @ end