IOS实现点击滑动抽屉效果

// 
// DrawerView.h 
// DrawerDemo 
// 
// Created by Zhouhaifeng on 12-3-27. 
// Copyright (c) 2012年 CJLU. All rights reserved. 
// 
 
#import <UIKit/UIKit.h> 
 
typedef enum 
{ 
 DrawerViewStateUp = 0, 
 DrawerViewStateDown 
}DrawerViewState; 
 
@interface DrawerView : UIView<UIGestureRecognizerDelegate> 
{ 
 UIImageView *arrow;   //向上拖拽时显示的图片  
 
 CGPoint upPoint;   //抽屉拉出时的中心点 
 CGPoint downPoint;   //抽屉收缩时的中心点 
  
 UIView *parentView;   //抽屉所在的view 
 UIView *contentView;  //抽屉里面显示的内容 
  
 DrawerViewState drawState; //当前抽屉状态 
} 
 
- (id)initWithView:(UIView *) contentview parentView :(UIView *) parentview; 
- (void)handlePan:(UIPanGestureRecognizer *)recognizer; 
- (void)handleTap:(UITapGestureRecognizer *)recognizer; 
- (void)transformArrow:(DrawerViewState) state; 
 
@property (nonatomic,retain) UIView *parentView; 
@property (nonatomic,retain) UIView *contentView; 
@property (nonatomic,retain) UIImageView *arrow; 
@property (nonatomic) DrawerViewState drawState; 
 
@end 

// 
// DrawerView.m 
// DrawerDemo 
// 
// Created by Zhouhaifeng on 12-3-27. 
// Copyright (c) 2012年 CJLU. All rights reserved. 
// 
 
#import "DrawerView.h" 
 
@implementation DrawerView 
@synthesize contentView,parentView,drawState; 
@synthesize arrow; 
 
- (id)initWithView:(UIView *) contentview parentView :(UIView *) parentview; 
{ 
 self = [super initWithFrame:CGRectMake(0,0,contentview.frame.size.width, contentview.frame.size.height+40)]; 
 if (self) { 
  // Initialization code   
  contentView = contentview; 
  parentView = parentview; 
   
  //一定要开启 
  [parentView setUserInteractionEnabled:YES]; 
   
  //嵌入内容区域的背景 
  UIImage *drawer_bg = [UIImage imageNamed:@"drawer_content.png"]; 
  UIImageView *view_bg = [[UIImageView alloc]initWithImage:drawer_bg]; 
  [view_bg setFrame:CGRectMake(0,40,contentview.frame.size.width, contentview.bounds.size.height+40)]; 
  [self addSubview:view_bg]; 
  
  //头部拉拽的区域背景 
  UIImage *drawer_handle = [UIImage imageNamed:@"drawer_handlepng.png"]; 
  UIImageView *view_handle = [[UIImageView alloc]initWithImage:drawer_handle]; 
  [view_handle setFrame:CGRectMake(0,0,contentview.frame.size.width,40)]; 
  [self addSubview:view_handle]; 
   
  //箭头的图片 
  UIImage *drawer_arrow = [UIImage imageNamed:@"drawer_arrow.png"]; 
  arrow = [[UIImageView alloc]initWithImage:drawer_arrow]; 
  [arrow setFrame:CGRectMake(0,0,28,28)]; 
  arrow.center = CGPointMake(contentview.frame.size.width/2, 20); 
  [self addSubview:arrow]; 
   
  //嵌入内容的UIView 
  [contentView setFrame:CGRectMake(0,40,contentview.frame.size.width, contentview.bounds.size.height+40)]; 
  [self addSubview:contentview]; 
   
  //移动的手势 
  UIPanGestureRecognizer *panRcognize=[[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(handlePan:)]; 
  panRcognize.delegate=self; 
  [panRcognize setEnabled:YES]; 
  [panRcognize delaysTouchesEnded]; 
  [panRcognize cancelsTouchesInView]; 
   
  [self addGestureRecognizer:panRcognize]; 
   
  //单击的手势 
  UITapGestureRecognizer *tapRecognize = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(handleTap:)]; 
  tapRecognize.numberOfTapsRequired = 1; 
  tapRecognize.delegate = self; 
  [tapRecognize setEnabled :YES]; 
  [tapRecognize delaysTouchesBegan]; 
  [tapRecognize cancelsTouchesInView]; 
   
  [self addGestureRecognizer:tapRecognize]; 
   
  //设置两个位置的坐标 
  downPoint = CGPointMake(parentview.frame.size.width/2, parentview.frame.size.height+contentview.frame.size.height/2-40); 
  upPoint = CGPointMake(parentview.frame.size.width/2, parentview.frame.size.height-contentview.frame.size.height/2-40); 
  self.center = downPoint; 
   
  //设置起始状态 
  drawState = DrawerViewStateDown; 
 } 
 return self; 
} 
 
 
#pragma UIGestureRecognizer Handles 
/*  
 * 移动图片处理的函数 
 * @recognizer 移动手势 
 */ 
- (void)handlePan:(UIPanGestureRecognizer *)recognizer { 
  
  
 CGPoint translation = [recognizer translationInView:parentView]; 
 if (self.center.y + translation.y < upPoint.y) { 
  self.center = upPoint; 
 }else if(self.center.y + translation.y > downPoint.y) 
 { 
  self.center = downPoint; 
 }else{ 
  self.center = CGPointMake(self.center.x,self.center.y + translation.y); 
 } 
 [recognizer setTranslation:CGPointMake(0, 0) inView:parentView]; 
  
 if (recognizer.state == UIGestureRecognizerStateEnded) { 
  [UIView animateWithDuration:0.75 delay:0.15 options:UIViewAnimationOptionCurveEaseOut animations:^{ 
    if (self.center.y < downPoint.y*4/5) { 
     self.center = upPoint; 
     [self transformArrow:DrawerViewStateUp]; 
    }else 
    { 
     self.center = downPoint; 
     [self transformArrow:DrawerViewStateDown]; 
    } 
 
  } completion:nil]; 
 
 }  
} 
 
/* 
 * handleTap 触摸函数 
 * @recognizer UITapGestureRecognizer 触摸识别器 
 */ 
-(void) handleTap:(UITapGestureRecognizer *)recognizer 
{ 
  [UIView animateWithDuration:0.75 delay:0.15 options:UIViewAnimationOptionTransitionCurlUp animations:^{ 
   if (drawState == DrawerViewStateDown) { 
    self.center = upPoint; 
    [self transformArrow:DrawerViewStateUp]; 
   }else 
   { 
    self.center = downPoint; 
    [self transformArrow:DrawerViewStateDown]; 
   } 
  } completion:nil]; 
 
} 
 
/* 
 * transformArrow 改变箭头方向 
 * state DrawerViewState 抽屉当前状态 
 */ 
-(void)transformArrow:(DrawerViewState) state 
{ 
  //NSLog(@"DRAWERSTATE :%d STATE:%d",drawState,state); 
  [UIView animateWithDuration:0.3 delay:0.35 options:UIViewAnimationOptionCurveEaseOut animations:^{ 
   if (state == DrawerViewStateUp){  
     arrow.transform = CGAffineTransformMakeRotation(M_PI); 
    }else 
    { 
      arrow.transform = CGAffineTransformMakeRotation(0); 
    } 
  } completion:^(BOOL finish){ 
    drawState = state; 
  }]; 
   
  
} 
 
@end