custompicker.m

iphone开发

/*

File: CustomPicker.m
Abstract: A custom UIPicker that shows text and images.

Version: 1.7

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*/

#import "CustomPicker.h"
#import "CustomView.h"

@implementation CustomPicker

- (id)initWithFrame:(CGRect)frame
{
	self = [super initWithFrame:frame];
	if (self)
	{
		self.delegate = self;	

		pickerViews = [[NSMutableArray alloc] init];
			
		CustomView *earlyMorningView = [[CustomView alloc] initWithFrame:CGRectZero];
		earlyMorningView.title = @"Early Morning";
		earlyMorningView.image = [UIImage imageNamed:@"12-6AM.png"];
		[pickerViews addObject:earlyMorningView];
		[earlyMorningView release];
		
		CustomView *lateMorningView = [[CustomView alloc] initWithFrame:CGRectZero];
		lateMorningView.title = @"Late Morning";
		lateMorningView.image = [UIImage imageNamed:@"6-12AM.png"];
		[pickerViews addObject:lateMorningView];
		[lateMorningView release];
		
		CustomView *afternoonView = [[CustomView alloc] initWithFrame:CGRectZero];
		afternoonView.title = @"Afternoon";
		afternoonView.image = [UIImage imageNamed:@"12-6PM.png"];
		[pickerViews addObject:afternoonView];
		[afternoonView release];
		
		CustomView *eveningView = [[CustomView alloc] initWithFrame:CGRectZero];
		eveningView.title = @"Evening";
		eveningView.image = [UIImage imageNamed:@"6-12PM.png"];
		[pickerViews addObject:eveningView];
		[eveningView release];
	}
	return self;
}

- (void)dealloc
{
	[pickerViews release];
	[super dealloc];
}


#pragma mark UIPicker delegate methods

// tell the picker how many rows are available for a given component (in our case we have one component)
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
	NSUInteger numRows;
	if (component == 0)
	{
		numRows = (NSUInteger)[pickerViews count];
	}
	return numRows;
}

// tell the picker which view to use for a given component and row, we have an array of color views to show
- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row
						forComponent:(NSInteger)component reusingView:(UIView *)view
{
	UIView *viewToUse = nil;
	if (component == 0)
	{
		viewToUse = [pickerViews objectAtIndex:row];
	}
	return viewToUse;
}

// tell the picker how many components it will have (in our case we have one component)
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
	return 1;
}

// tell the picker the title for a given component (in our case we have one component)
- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
{
	NSString *title;
	if (component == 0)
	{
		title = @"color";
	}
	return title;
}

// tell the picker the width of each row for a given component (in our case we have one component)
- (CGFloat)pickerView:(UIPickerView *)pickerView widthForComponent:(NSInteger)component
{
	CustomView *viewToUse = [pickerViews objectAtIndex:0];
	return viewToUse.bounds.size.width;
}

// tell the picker the height of each row for a given component (in our case we have one component)
- (CGFloat)pickerView:(UIPickerView *)pickerView rowHeightForComponent:(NSInteger)component
{
	CustomView *viewToUse = [pickerViews objectAtIndex:0];
	return viewToUse.bounds.size.height;
}

@end