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POhow to get information of an object instance from ID number
 

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  1. POhow to get information of an object instance from ID number
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    <p>I have a program that has 2 tables on two different windows. One table holds the customer name and id number and the other one hold the item name and number. They are both stored in a array and also in a .plist file.</p> <p>What i would like to do is that on a third page there is going to be a sales page where the user will enter the customer id and item id and the program should be able to find the name and display it to a label. I don't know where to start and go. Could somebody please help or show me how to do i? I can upload any code that anybody wants to see but as I dont know where to start I dont know what to upload.<br> this is the customer.h file </p> <pre><code>#import &lt;Foundation/Foundation.h&gt; NSString *name; int memberNumber; @interface Customer : NSObject &lt;NSCoding&gt; { NSString *name; int memberNumber; } @property (nonatomic, copy) NSString *name; @property int memberNumber; @end </code></pre> <p>this is the customer.m </p> <pre><code>#import "Customer.h" @implementation Customer @synthesize name; @synthesize memberNumber; -(id) init { self = [super init]; if(self) { name = @"Test"; int i = arc4random()%1000000000000000000; if (i&lt;0) { memberNumber = i*-1; } else memberNumber = i; } return self; } - (id)initWithCoder:(NSCoder *)decoder { if (self = [super init]) { self.name = [decoder decodeObjectForKey:@"name"]; self.memberNumber = [decoder decodeIntForKey:@"memberNumber"]; } return self; } - (void)encodeWithCoder:(NSCoder *)encoder { [encoder encodeObject:name forKey:@"name"]; [encoder encodeInt:memberNumber forKey:@"memberNumber"]; } -(void)dealloc { [name release]; [super dealloc]; } @end </code></pre> <p>this is the tableView.h file </p> <pre><code>#import &lt;Foundation/Foundation.h&gt; #include &lt;stdlib.h&gt; NSString *filepath; @interface tableViewData : NSObject &lt;NSTableViewDataSource&gt; { @private IBOutlet NSTableView *tableView; NSMutableArray *list; NSString *filepath; } -(IBAction)add:(id)sender; -(IBAction)remove:(id)sender; @end </code></pre> <p>this is the tableView.m file</p> <pre><code>#import "tableViewData.h" #import "Customer.h" @implementation tableViewData -(void)awakeFromNib{ filepath = @"/Users/Desktop/CustomerNames.plist"; if ([[NSFileManager defaultManager]fileExistsAtPath:filepath]) { NSMutableArray *archive = [NSKeyedUnarchiver unarchiveObjectWithFile:filepath]; list = archive; } else list=[[NSMutableArray alloc]init]; } -(NSInteger)numberOfRowsInTableView:(NSTableView *)tableView { return [list count]; } -(id)tableView:(NSTableView *)tableView objectValueForTableColumn:(NSTableColumn *)tableColumn row:(NSInteger)row { Customer *Customer = [list objectAtIndex:row]; NSString *identifier = [tableColumn identifier]; return [Customer valueForKey:identifier]; } -(void)tableView:(NSTableView *)tableView setObjectValue:(id)object forTableColumn: (NSTableColumn *)tableColumn row:(NSInteger)row { Customer *Customer = [list objectAtIndex:row]; NSString *identifier = [tableColumn identifier]; [Customer setValue:object forKey:identifier]; NSData *data = [NSKeyedArchiver archivedDataWithRootObject:list]; [data writeToFile:filepath options:NSDataWritingAtomic error:nil]; } -(IBAction)add:(id)sender { [list addObject:[[Customer alloc]init]]; [tableView reloadData]; NSData *data = [NSKeyedArchiver archivedDataWithRootObject:list]; [data writeToFile:filepath options:NSDataWritingAtomic error:nil]; for (id name in list) NSLog(@"obj: %@", name); NSLog (@"array:%@",list); } -(IBAction)remove:(id)sender { NSInteger row = [tableView selectedRow]; if (row != -1) { [list removeObjectAtIndex:row]; } [tableView reloadData]; NSData *data = [NSKeyedArchiver archivedDataWithRootObject:list]; [data writeToFile:filepath options:NSDataWritingAtomic error:nil]; } -(void)dealloc { [super dealloc]; } @end </code></pre> <p>hope this helps</p> <p>(xcode 4.2.1 for OS X)</p>
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