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POBest Pattern for multiple Popovers in Storyboard
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  1. POBest Pattern for multiple Popovers in Storyboard
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    copied!<p>I am writing an iPad application which will have several buttons that when clicked open a popover to a tableview. The user will choose a value, and the popover will be dismissed and the button't title will change. </p> <p>I got this working with one Popover, and then wanted to add another. I want to write some good, clean reusable code. </p> <p>My big hangup is with delegates. How many should there be? Should each popover have its own.</p> <p>Root View Controller Header</p> <pre><code>#import &lt;UIKit/UIKit.h&gt; #import "PopViewController1.h" #import "PopViewController2.h" @interface RootViewController : UIViewController &lt;PopViewControllerDelegate,UIPopoverControllerDelegate&gt; // Properties for accessing the popover and its viewcontroller (1) @property (strong, nonatomic) IBOutlet UIButton *btnOpenPopover1; @property (strong, nonatomic) UIStoryboardPopoverSegue *pvcSegue1; @property (strong, nonatomic) PopViewController1 *pvc1; // Properties for accessing the popover and its viewcontroller (2) @property (strong, nonatomic) IBOutlet UIButton *btnOpenPopover2; @property (strong, nonatomic) UIStoryboardPopoverSegue *pvcSegue2; @property (strong, nonatomic) PopViewController2 *pvc2; @end </code></pre> <p>Root View Controller Method</p> <pre><code>#import "RootViewController.h" @interface RootViewController () @end @implementation RootViewController - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil { self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]; if (self) { } return self; } - (void)viewDidLoad { [super viewDidLoad]; } - (void)viewDidUnload { [self setBtnOpenPopover1:nil]; [super viewDidUnload]; } - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation { return YES; } -(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender { if ([[segue identifier] isEqualToString:@"segPop1"]) { _pvcSegue1 = (UIStoryboardPopoverSegue *)segue; _pvc1 = [segue destinationViewController]; [_pvc1 setDelegate:self]; } else ([[segue identifier] isEqualToString:@"segPop2"]); { _pvcSegue2 = (UIStoryboardPopoverSegue *)segue; _pvc2 = [segue destinationViewController]; //[_pvc2 setDelegate:self]; } } // PopViewControllerDelegate callback function - (void)dismissPop:(NSString *)value { [_btnOpenPopover1 setTitle:value forState:UIControlStateNormal]; [[_pvcSegue1 popoverController] dismissPopoverAnimated: YES]; // dismiss the popover } @end </code></pre> <p>PopViewController1.h</p> <pre><code>#import &lt;UIKit/UIKit.h&gt; @protocol PopViewControllerDelegate; @interface PopViewController1 : UITableViewController @property (weak) id &lt;PopViewControllerDelegate&gt; delegate; @property (strong, nonatomic) NSString *strPassedValue; @property (nonatomic, strong) NSMutableArray *importantChoices; @end @protocol PopViewControllerDelegate &lt;NSObject&gt; @required - (void)dismissPop:(NSString *)value; @end </code></pre> <p>PopViewController1 Method</p> <pre><code>#import "PopViewController1.h" @interface PopViewController1 () @end @implementation PopViewController1 - (id)initWithCoder:(NSCoder *)aDecoder { //Popover Choices _importantChoices = [NSMutableArray array]; [_importantChoices addObject:@"Extremely Important"]; [_importantChoices addObject:@"Very Important"]; [_importantChoices addObject:@"Somewhat Important"]; [_importantChoices addObject:@"Not Very Important"]; [_importantChoices addObject:@"Not At All Important"]; self.clearsSelectionOnViewWillAppear = NO; NSInteger rowsCount = [_importantChoices count]; NSInteger singleRowHeight = [self.tableView.delegate tableView:self.tableView heightForRowAtIndexPath:[NSIndexPath indexPathForRow:0 inSection:0]]; NSInteger totalRowsHeight = rowsCount * singleRowHeight; //Calculate how wide the view should be by finding how //wide each string is expected to be CGFloat largestLabelWidth = 0; for (NSString *colorName in _importantChoices) { //Checks size of text using the default font for UITableViewCell's textLabel. CGSize labelSize = [colorName sizeWithFont:[UIFont boldSystemFontOfSize:20.0f]]; if (labelSize.width &gt; largestLabelWidth) { largestLabelWidth = labelSize.width; } } //Add a little padding to the width CGFloat popoverWidth = largestLabelWidth + 100; //Set the property to tell the popover container how big this view will be. self.contentSizeForViewInPopover = CGSizeMake(popoverWidth, totalRowsHeight); return self; } - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil { self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]; if (self) { // Uncomment the following line to preserve selection between presentations. //self.clearsSelectionOnViewWillAppear = NO; // Uncomment the following line to display an Edit button in the navigation bar for this view controller. // self.navigationItem.rightBarButtonItem = self.editButtonItem; } return self; } - (void)viewDidLoad { [super viewDidLoad]; } - (void)viewDidUnload { [super viewDidUnload]; } - (void)viewWillAppear: (BOOL)animated { } - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView { // Return the number of sections. return 1; } - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { // Return the number of rows in the section. return [_importantChoices count];} - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *CellIdentifier = @"Cell"; UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier]; if (cell == nil) { cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier]; } cell.textLabel.text = [_importantChoices objectAtIndex:indexPath.row]; return cell; } - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { _strPassedValue = [_importantChoices objectAtIndex:indexPath.row]; [_delegate dismissPop:_strPassedValue]; } @end </code></pre> <p>PopViewController2 Header</p> <pre><code>#import &lt;UIKit/UIKit.h&gt; @protocol PopViewControllerDelegate; @interface PopViewController2 : UITableViewController @property (weak) id &lt;PopViewControllerDelegate&gt; delegate; @property (strong, nonatomic) NSString *strPassedValue2; @property (nonatomic, strong) NSMutableArray *importantChoices2; @end @protocol PopViewControllerDelegate &lt;NSObject&gt; @required - (void)dismissPop2:(NSString *)value; @end </code></pre> <p>PopViewController2 Method</p> <h1>import "PopViewController2.h"</h1> <p>@interface PopViewController2 ()</p> <p>@end</p> <p>@implementation PopViewController2</p> <pre><code>- (id)initWithCoder:(NSCoder *)aDecoder { //Popover Choices _importantChoices = [NSMutableArray array]; [_importantChoices addObject:@"Extremely Important"]; [_importantChoices addObject:@"Very Important"]; [_importantChoices addObject:@"Somewhat Important"]; [_importantChoices addObject:@"Not Very Important"]; [_importantChoices addObject:@"Not At All Important"]; self.clearsSelectionOnViewWillAppear = NO; NSInteger rowsCount = [_importantChoices count]; NSInteger singleRowHeight = [self.tableView.delegate tableView:self.tableView heightForRowAtIndexPath:[NSIndexPath indexPathForRow:0 inSection:0]]; NSInteger totalRowsHeight = rowsCount * singleRowHeight; //Calculate how wide the view should be by finding how //wide each string is expected to be CGFloat largestLabelWidth = 0; for (NSString *colorName in _importantChoices) { //Checks size of text using the default font for UITableViewCell's textLabel. CGSize labelSize = [colorName sizeWithFont:[UIFont boldSystemFontOfSize:20.0f]]; if (labelSize.width &gt; largestLabelWidth) { largestLabelWidth = labelSize.width; } } //Add a little padding to the width CGFloat popoverWidth = largestLabelWidth + 100; //Set the property to tell the popover container how big this view will be. self.contentSizeForViewInPopover = CGSizeMake(popoverWidth, totalRowsHeight); return self; } - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil { self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]; if (self) { // Uncomment the following line to preserve selection between presentations. //self.clearsSelectionOnViewWillAppear = NO; // Uncomment the following line to display an Edit button in the navigation bar for this view controller. // self.navigationItem.rightBarButtonItem = self.editButtonItem; } return self; } - (void)viewDidLoad { [super viewDidLoad]; } - (void)viewDidUnload { [super viewDidUnload]; } - (void)viewWillAppear: (BOOL)animated { } - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView { // Return the number of sections. return 1; } - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { // Return the number of rows in the section. return [_importantChoices count];} - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *CellIdentifier = @"Cell"; UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier]; if (cell == nil) { cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier]; } cell.textLabel.text = [_importantChoices objectAtIndex:indexPath.row]; return cell; } - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { _strPassedValue = [_importantChoices objectAtIndex:indexPath.row]; [_delegate dismissPop:_strPassedValue]; } @end </code></pre> <p>Any help or suggestions would be greatly appreciated!!!</p> <p>Bryan</p>
 

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