iOS抽屉效果、二级菜单（点击，拖拽滑动）

好像最近，看到好多Android上的抽屉效果，也忍不住想要自己写一个。在Android里面可以用SlidingDrawer，很方便的实现。IOS上面就只有自己写了。其实原理很简单就是 UIView 的移动，和一些手势的操作。

 //
 //  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.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

 //
 //  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