// // 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;   //向上拖拽時顯示的圖片    CGPoint upPoint;   //抽屜拉出時的中心點  CGPoint downPoint;   //抽屜收縮時的中心點    UIView *parentView;   //抽屜所在的view  UIView *contentView;  //抽屜里面顯示的內容    DrawerViewState drawState; //當前抽屜狀態 }  - (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;      //一定要開啟   [parentView setUserInteractionEnabled:YES];      //嵌入內容區域的背景   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];     //頭部拉拽的區域背景   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];      //箭頭的圖片   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];      //嵌入內容的UIView   [contentView setFrame:CGRectMake(0,40,contentview.frame.size.width, contentview.bounds.size.height+40)];   [self addSubview:contentview];      //移動的手勢   UIPanGestureRecognizer *panRcognize=[[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(handlePan:)];   panRcognize.delegate=self;   [panRcognize setEnabled:YES];   [panRcognize delaysTouchesEnded];   [panRcognize cancelsTouchesInView];      [self addGestureRecognizer:panRcognize];      //單擊的手勢   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];      //設置兩個位置的坐標   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;      //設置起始狀態   drawState = DrawerViewStateDown;  }  return self; }   #pragma UIGestureRecognizer Handles /*   * 移動圖片處理的函數  * @recognizer 移動手勢  */ - (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 觸摸函數  * @recognizer UITapGestureRecognizer 觸摸識別器  */ -(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 改變箭頭方向  * state DrawerViewState 抽屜當前狀態  */ -(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