IOS实现点击滑动抽屉效果

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。

效果图：

//
// 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 

以上就是本文的全部内容，希望对大家的学习有所帮助。