example on using pickerView: M18Coffee

ExtendingCells/Classes/FirstViewController.m

@@ -9,7 +9,7 @@
 @implementation FirstViewController
 - (void)viewDidLoad {
     [super viewDidLoad];
-    selectedIndexPath = nil;
+    selectedIndexPath = [[NSIndexPath indexPathForRow:-1 inSection:-1] retain];
     articles = [[NSDictionary dictionaryWithObject:[NSArray arrayWithObjects:@"one", @"two", @"three",
                                                     @"four", @"five", @"six",
                                                     @"seven", @"eight", @"nine",
@@ -61,6 +61,7 @@ - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(N
     if (cell == nil) {
         cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:MyIdentifier] autorelease];
     }
+
     id key = [[articles allKeys] objectAtIndex:indexPath.section];
     cell.textLabel.text = [[articles objectForKey:key] objectAtIndex:indexPath.row];
     return cell;

M18Coffee/.gitattributes

@@ -0,0 +1,2 @@
+*.pbxproj -crlf -diff -merge
+*.xib/ -crlf -diff -merge

M18Coffee/.gitignore

@@ -0,0 +1,13 @@
+.DS_Store
+*.swp
+*~.nib
+
+build/
+*.psd
+
+*.pbxuser
+*.perspective
+*.perspectivev3
+
+*.mode1v3
+*.mode2v3

M18Coffee/Classes/M18CoffeeAppDelegate.h

@@ -0,0 +1,19 @@
+//
+//  M18CoffeeAppDelegate.h
+//  M18Coffee
+//
+//  Created by Manuel on 19.01.10.
+//  Copyright apparatschik 2010. All rights reserved.
+//
+
+@interface M18CoffeeAppDelegate : NSObject <UIApplicationDelegate> {
+
+    UIWindow *window;
+    UINavigationController *navigationController;
+}
+
+@property (nonatomic, retain) IBOutlet UIWindow *window;
+@property (nonatomic, retain) IBOutlet UINavigationController *navigationController;
+
+@end
+

M18Coffee/Classes/M18CoffeeAppDelegate.m

@@ -0,0 +1,47 @@
+//
+//  M18CoffeeAppDelegate.m
+//  M18Coffee
+//
+//  Created by Manuel on 19.01.10.
+//  Copyright apparatschik 2010. All rights reserved.
+//
+
+#import "M18CoffeeAppDelegate.h"
+#import "RootViewController.h"
+
+
+@implementation M18CoffeeAppDelegate
+
+@synthesize window;
+@synthesize navigationController;
+
+
+#pragma mark -
+#pragma mark Application lifecycle
+
+- (void)applicationDidFinishLaunching:(UIApplication *)application {    
+
+    // Override point for customization after app launch    
+
+	[window addSubview:[navigationController view]];
+    [window makeKeyAndVisible];
+}
+
+
+- (void)applicationWillTerminate:(UIApplication *)application {
+	// Save data if appropriate
+}
+
+
+#pragma mark -
+#pragma mark Memory management
+
+- (void)dealloc {
+	[navigationController release];
+	[window release];
+	[super dealloc];
+}
+
+
+@end
+

M18Coffee/Classes/M18PickerViewController.h

@@ -0,0 +1,25 @@
+//
+//  M18PickerViewController.h
+//  M18Coffee
+//
+//  Created by vikingosegundo on 18.01.10.
+//  Copyright 2010 apparatschik. All rights reserved.
+//
+
+#import <UIKit/UIKit.h>
+
+
+@interface M18PickerViewController : UIViewController {
+	IBOutlet UIPickerView *pickerView;
+	NSArray *coffeeKinds;
+	NSArray *coffeeOptions;
+	NSArray *latteOptions;
+}
+
+-(IBAction) addCoffee;
+
+@property(nonatomic,retain) NSArray *coffeeKinds;
+@property(nonatomic,retain) NSArray *coffeeOptions;
+@property(nonatomic, retain)NSArray *latteOptions;
+
+@end

M18Coffee/Classes/M18PickerViewController.m

@@ -0,0 +1,167 @@
+//
+//  M18PickerViewController.m
+//  M18Coffee
+//
+//  Created by vikingosegundo on 18.01.10.
+//  Copyright 2010 apparatschik. All rights reserved.
+//
+
+#import "M18PickerViewController.h"
+#import "RootViewController.h"
+
+
+@interface M18PickerViewController ()
+NSInteger numberOfComponents;
+@end
+
+
+@implementation M18PickerViewController
+
+
+
+@synthesize coffeeKinds;
+@synthesize coffeeOptions;
+@synthesize latteOptions;
+
+- (void)viewDidLoad {
+	[super viewDidLoad];
+	[[self.view viewWithTag:1] setHidden:NO];
+	[self.view becomeFirstResponder];
+	coffeeKinds = [[NSArray alloc] initWithObjects:@"",@"Coffee",@"Cappuchino",@"Latte",@"Espresso",@"Milkcoffee",nil];
+
+	coffeeOptions = [[NSArray alloc] initWithObjects:@"",@"soymilk",@"doubled",@"cremé",@"simple",@"macchiato",nil];
+	latteOptions = [[NSArray alloc] initWithObjects:@"",@"Caramel", @"Hazelnut",@"Almond", nil];
+	UIButton *button = (UIButton*)[self.view viewWithTag:2];
+	[button setEnabled:NO];
+	numberOfComponents = 3;
+}
+
+ - (void)viewWillAppear:(BOOL)animated {
+ [super viewWillAppear:animated];
+ }
+
+
+
+- (void)didReceiveMemoryWarning {
+	// Releases the view if it doesn't have a superview.
+    [super didReceiveMemoryWarning];
+
+	// Release any cached data, images, etc that aren't in use.
+}
+
+- (void)viewDidUnload {
+	// Release any retained subviews of the main view.
+	// e.g. self.myOutlet = nil;
+}
+
+
+- (void)dealloc {
+	[self.coffeeKinds release], self.coffeeKinds = nil;
+	[self.coffeeOptions release], self.coffeeOptions=nil;
+    [super dealloc];
+}
+- (IBAction) addCoffee{	
+	UIButton *button =(UIButton*)[self.view viewWithTag:2];
+
+	UITableView *tv =(UITableView*)[[self.view window] viewWithTag:100];
+
+	UIPickerView* picker = (UIPickerView*)[self.view viewWithTag:1];
+
+
+	NSString *row1 = [NSString stringWithFormat: @"%i", [picker selectedRowInComponent:0]+1];
+	NSString *row2 = [NSString stringWithFormat: @"%@", [self.coffeeKinds objectAtIndex:[picker selectedRowInComponent:1]]];
+	NSString *row3 = [NSString stringWithFormat: @"%@", [self.coffeeOptions objectAtIndex:[picker selectedRowInComponent:2]] ];
+
+	[(RootViewController *)tv.dataSource addRow:[NSString stringWithFormat:@"%@ %@ %@",row1,row2,row3]];
+	[picker selectRow:0 inComponent:0 animated:YES ];
+	[picker selectRow:0 inComponent:1 animated:YES ];
+	[picker selectRow:0 inComponent:2 animated:YES ];
+	[button setEnabled:NO];
+	[button setTitle:@"" forState:UIControlStateNormal];
+	[button setHighlighted:NO];
+}	
+
+
+- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pv{
+	return numberOfComponents;
+}
+
+// returns the # of rows in each component..
+- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component{
+	NSInteger i;
+	if (component == 0) {
+		i= 7;
+	} else if (component == 1) {
+		i= [self.coffeeKinds count]; 
+
+	} else if (component == 2) {
+		i= [self.coffeeOptions count]; 
+	} else {
+		i = [self.latteOptions count];
+	}
+
+	return i;
+}
+
+- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component{
+
+	NSString *string;
+	if (component == 0) {
+		string = [NSString stringWithFormat:@"%i",row+1];
+	} else if (component == 1) {
+		string = [NSString stringWithFormat:@"%@", [self.coffeeKinds objectAtIndex:row]];
+		if ([string  isEqualToString: @"" ]) {
+			[[self.view viewWithTag:3] setHidden:YES];
+		}
+	}else if (component == 2) {
+		string = [NSString stringWithFormat:@"%@", [self.coffeeOptions objectAtIndex:row]];
+	}else if (component == 3) {
+		string = [NSString stringWithFormat:@"%@", [self.latteOptions objectAtIndex:row]];
+	}
+	return string;
+}
+- (CGFloat)pickerView:(UIPickerView *)pv widthForComponent:(NSInteger)component {
+	CGFloat f;
+	if (component == 0) {
+		f = 30;
+
+	} else{
+		f = [[pv viewWithTag:1] frame].size.width-80; 
+		f = f/(numberOfComponents -1);
+	}
+	return f;
+}
+- (void)pickerView:(UIPickerView *)pv didSelectRow:(NSInteger)row inComponent:(NSInteger)component{
+	UIButton *button =(UIButton*)[self.view viewWithTag:2];
+
+	if ([pv selectedRowInComponent:1] == 0) {
+		[button setEnabled:NO];
+		[button setHighlighted:NO];
+	}	else {
+		[button setEnabled:YES];
+		[button setHighlighted:YES];
+	}	
+
+	UIPickerView* picker = (UIPickerView*)[self.view viewWithTag:1];
+	NSString *row1 = [NSString stringWithFormat: @"%i", [picker selectedRowInComponent:0]+1];
+	NSString *row2 = [NSString stringWithFormat: @"%@", [self.coffeeKinds objectAtIndex:[picker selectedRowInComponent:1]]];
+	NSString *row3 = [NSString stringWithFormat: @"%@", [self.coffeeOptions objectAtIndex:[picker selectedRowInComponent:2]] ];
+	[button setTitle:[NSString stringWithFormat:@"%@ %@ %@",row1,row2,row3] forState:UIControlStateNormal];
+	if (component == 1 && row == 3) {
+		numberOfComponents = 4;
+		[pv reloadAllComponents];
+	} else if ([pv selectedRowInComponent:1] !=3) {
+		numberOfComponents = 3;
+		[pv reloadAllComponents];
+	}
+
+	if (numberOfComponents == 4) {
+		NSString *row4 = [self.latteOptions objectAtIndex:[picker selectedRowInComponent:3]];
+		[button setTitle:[button.titleLabel.text stringByAppendingFormat:@" %@", row4] forState:UIControlStateNormal];
+	}
+
+
+}
+
+
+@end

M18Coffee/Classes/RootViewController.h

@@ -0,0 +1,27 @@
+//
+//  RootViewController.h
+//  M18Coffee
+//
+//  Created by Manuel on 19.01.10.
+//  Copyright apparatschik 2010. All rights reserved.
+//
+#import "M18PickerViewController.h"
+
+@interface RootViewController : UITableViewController {
+	M18PickerViewController* pickerViewController;
+	NSMutableArray *data;
+	NSManagedObjectModel *managedObjectModel;
+    NSManagedObjectContext *managedObjectContext;	    
+    NSPersistentStoreCoordinator *persistentStoreCoordinator;
+}
+
+-(IBAction) togglePicker;
+-(void) addRow:(NSString*) row;
+@property(nonatomic,retain) M18PickerViewController *pickerViewController;
+@property(nonatomic,retain) NSMutableArray *data;
+
+@property (nonatomic, retain, readonly) NSManagedObjectModel *managedObjectModel;
+@property (nonatomic, retain, readonly) NSManagedObjectContext *managedObjectContext;
+@property (nonatomic, retain, readonly) NSPersistentStoreCoordinator *persistentStoreCoordinator;
+
+@end