弹出菜单的实现

核心代码如下，具体的请参考附件。

PopupPanelViewController.h

#import <UIKit/UIKit.h>

@class VerticalPopupPanel;
@interface PopupPanelViewController : UIViewController<UIImagePickerControllerDelegate,UINavigationControllerDelegate> {
    IBOutlet VerticalPopupPanel *verPanel;
}

- (IBAction)doPopupAction:(id)sender;
- (IBAction)cameraBtnTouchDown:(id)sender;
- (IBAction)settingBtnTouchDown:(id)sender;

@property (nonatomic, retain) IBOutlet VerticalPopupPanel *verPanel;
@end

PopupPanelViewController.m

#import "PopupPanelViewController.h"
#import "VerticalPopupPanel.h"
#import "SettingsViewController.h"

@implementation PopupPanelViewController

@synthesize verPanel;

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

- (IBAction)doPopupAction:(id)sender {
	if (verPanel.isPopup) {
		[verPanel hide];
	} else {
		[verPanel popup];
	}	
}

- (IBAction)cameraBtnTouchDown:(id)sender {
	UIImagePickerController *picker = [[UIImagePickerController alloc] init];
	picker.delegate = self;
	picker.sourceType = UIImagePickerControllerSourceTypeCamera;
	[self presentModalViewController:picker animated:YES];
	[picker release];	
}

- (IBAction)settingBtnTouchDown:(id)sender {
	SettingsViewController *settingView = [[SettingsViewController alloc] initWithNibName:@"SettingsViewController" bundle:nil];
	[self.navigationController pushViewController:settingView animated:YES];
	[settingView release];
}

#pragma mark - 
#pragma mark UIImagePickerController delegate

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{
	[picker dismissModalViewControllerAnimated:YES];
}

- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker{
	[picker dismissModalViewControllerAnimated:YES];
}

@end

VerticalPopupPanel.h

#import <UIKit/UIKit.h>
#import <QuartzCore/QuartzCore.h>

@interface VerticalPopupPanel : UIView {
	CGRect popupRect;
	CGRect hideRect;
	float panelHeight;
	BOOL isPopup;
}

@property BOOL isPopup;

- (void)popup;
- (void)hide;

@end

VerticalPopupPanel.m

#import "VerticalPopupPanel.h"

@implementation VerticalPopupPanel

@synthesize isPopup;

- (id)initWithCoder:(NSCoder *)aDecoder {
	if (self = [super initWithCoder:aDecoder]) {
		popupRect = self.frame;
		hideRect = CGRectMake(popupRect.origin.x, popupRect.origin.y + popupRect.size.height, popupRect.size.width, 0);
		self.frame = hideRect;
		isPopup = NO;
		[self.layer setCornerRadius:10.0];
		[self setClipsToBounds:YES];
	}
	return self;
}

- (void)popup {
	isPopup = YES;
	[UIView beginAnimations:nil context:nil];
	[UIView setAnimationDuration:0.2];
	[UIView setAnimationCurve:UIViewAnimationCurveLinear];
	[self setFrame:popupRect];
	[UIView commitAnimations];
}

- (void)hide {
	isPopup = NO;
	[UIView beginAnimations:nil context:nil];
	[UIView setAnimationDuration:0.2];
	[UIView setAnimationCurve:UIViewAnimationCurveLinear];
	[self setFrame:hideRect];
	[UIView commitAnimations];
}

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

@end

示例图：

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