How to use picker in iphone, A simple example.

#import "ViewController.h"

@implementation ViewController
@synthesize mlabel;

- (void)viewDidLoad
{
	[super viewDidLoad];
	arrayNo = [[NSMutableArray alloc] init];
	[arrayNo addObject:@" Hello "];
	[arrayNo addObject:@" Hai "];
	[arrayNo addObject:@" Picker "];
	[arrayNo addObject:@" Simple "];
	[arrayNo addObject:@" example "];

	[pickerView selectRow:1 inComponent:0 animated:NO];
	mlabel.text= [arrayNo objectAtIndex:[pickerView selectedRowInComponent:0]];
}

- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView;
{
	return 1;
}

- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
	mlabel.text= [arrayNo objectAtIndex:row];
}

- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component;
{
	return [arrayNo count];
}

- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component;
{
	return [arrayNo objectAtIndex:row];
}

/*
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {
[super viewDidLoad];
}
*/

/*
// Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
// Return YES for supported orientations
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
*/

- (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
{
	[super dealloc];
}
@end