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POHow to use protocol
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  1. POHow to use protocol
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    copied!<p>I have two viewControllers</p> <ul> <li>ServiceProvider</li> <li>WorkLocation</li> </ul> <p>In <code>ServiceProvider</code> I have one text field and a pick button. When user click on pick button it will redirect to <code>WorkLocation</code> which has a list of <code>location</code>s. When user select any <code>location</code> and then click on pick button from <code>WorkLocation</code> it will redirect back to <code>ServiceProvider</code> page with <code>locationName</code> and <code>Id</code>. And in <code>ServiceProvider</code> page <code>locationName</code> will be displayed in the text field which is already there.</p> <p>To perform this I am using a protocol.</p> <p>WorkLocation declaration:</p> <pre><code> #import &lt;UIKit/UIKit.h&gt; #import "WorkDetailCell.h" @protocol WorkLocationDetailViewDelegate &lt;NSObject&gt; @required -(void)organizationInfo:(NSString *) organization_id name:(NSString *)name; @end @interface WorkLocationDetailsViewController :UIViewController &lt; UITableViewDelegate, UITableViewDataSource, UISearchBarDelegate &gt; { IBOutlet UITableView *workLocationTableView; IBOutlet UISearchBar *workLocationSearchBar; NSMutableArray *workDetailArray,*tempDataArray,*searchArray,*searchResultArray; BOOL search; } @property (nonatomic,retain) id &lt; WorkLocationDetailViewDelegate &gt; delegate; </code></pre> <p>WorkLocation implementation:</p> <pre><code> -(IBAction)doneButtonClicked:(id)sender { if (search==FALSE) { NSLog(@"pick%d",[sender tag]); NSLog(@"pick from temp"); NSDictionary *detailList=[tempDataArray objectAtIndex:[sender tag]]; [_delegate organizationInfo:detailList[@"organizationId"] name:detailList[@"organizationName"]]; } else { NSLog(@"pick from search"); } [self.navigationController popToRootViewControllerAnimated:YES]; } </code></pre> <p>and in ServiceProvider implementation file:</p> <pre><code>-(void)organizationInfo:(NSString*)organization_id name:(NSString *)name { NSString *id=organization_id; txtWorkLocation.text=name; NSLog(@"%@ %@",organization_id,name); } </code></pre> <p>Now when I came back from <code>WorkLocation</code> page this method is not called. Declaration of <code>ServiceProvider</code>:</p> <pre><code>#import "WorkLocationDetailsViewController.h" @class RadioButtonView; @class WorkLocationDetailsViewController; @protocol ServiceProviderProfileDelegate &lt;NSObject&gt; @required -(void)setProImages:(UIImage *)img; @end @interface ServiceProviderProfileViewController : UIViewController &lt; UINavigationControllerDelegate, UIImagePickerControllerDelegate, RadioButtonDelegate, WorkLocationDetailViewDelegate &gt; { NSString *gratuityStr,*paymentStr; RadioButtonView *gratuityGroup,*paymentGroup; IBOutlet UILabel *usernameLabel; NSString *gratuitySelection,*receivePayment; WorkLocationDetailsViewController *WorkVC; } </code></pre>
 

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