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。


[cpp] view plain copy print ?
  1. //
  2. // DrawerView.h
  3. // DrawerDemo
  4. //
  5. // Created by Zhouhaifeng on 12-3-27.
  6. // Copyright (c) 2012年 CJLU. All rights reserved.
  7. //
  9. #import <UIKit/UIKit.h>
  11. typedef enum
  12. {
  13. DrawerViewStateUp = 0,
  14. DrawerViewStateDown
  15. }DrawerViewState;
  17. @interface DrawerView : UIView<UIGestureRecognizerDelegate>
  18. {
  19. UIImageView *arrow; //向上拖拽时显示的图片
  21. CGPoint upPoint; //抽屉拉出时的中心点
  22. CGPoint downPoint; //抽屉收缩时的中心点
  24. UIView *parentView; //抽屉所在的view
  25. UIView *contentView; //抽屉里面显示的内容
  27. DrawerViewState drawState; //当前抽屉状态
  28. }
  30. - (id)initWithView:(UIView *) contentview parentView :(UIView *) parentview;
  31. - (void)handlePan:(UIPanGestureRecognizer *)recognizer;
  32. - (void)handleTap:(UITapGestureRecognizer *)recognizer;
  33. - (void)transformArrow:(DrawerViewState) state;
  35. @property (nonatomic,retain) UIView *parentView;
  36. @property (nonatomic,retain) UIView *contentView;
  37. @property (nonatomic,retain) UIImageView *arrow;
  38. @property (nonatomic) DrawerViewState drawState;
  40. @end

[cpp] view plain copy print ?
  1. //
  2. // DrawerView.m
  3. // DrawerDemo
  4. //
  5. // Created by Zhouhaifeng on 12-3-27.
  6. // Copyright (c) 2012年 CJLU. All rights reserved.
  7. //
  9. #import "DrawerView.h"
  11. @implementation DrawerView
  12. @synthesize contentView,parentView,drawState;
  13. @synthesize arrow;
  15. - (id)initWithView:(UIView *) contentview parentView :(UIView *) parentview;
  16. {
  17. self = [super initWithFrame:CGRectMake(0,0,contentview.frame.size.width, contentview.frame.size.height+40)];
  18. if (self) {
  19. // Initialization code
  20. contentView = contentview;
  21. parentView = parentview;
  23. //一定要开启
  24. [parentView setUserInteractionEnabled:YES];
  26. //嵌入内容区域的背景
  27. UIImage *drawer_bg = [UIImage imageNamed:@"drawer_content.png"];
  28. UIImageView *view_bg = [[UIImageView alloc]initWithImage:drawer_bg];
  29. [view_bg setFrame:CGRectMake(0,40,contentview.frame.size.width, contentview.bounds.size.height+40)];
  30. [self addSubview:view_bg];
  32. //头部拉拽的区域背景
  33. UIImage *drawer_handle = [UIImage imageNamed:@"drawer_handlepng.png"];
  34. UIImageView *view_handle = [[UIImageView alloc]initWithImage:drawer_handle];
  35. [view_handle setFrame:CGRectMake(0,0,contentview.frame.size.width,40)];
  36. [self addSubview:view_handle];
  38. //箭头的图片
  39. UIImage *drawer_arrow = [UIImage imageNamed:@"drawer_arrow.png"];
  40. arrow = [[UIImageView alloc]initWithImage:drawer_arrow];
  41. [arrow setFrame:CGRectMake(0,0,28,28)];
  42. arrow.center = CGPointMake(contentview.frame.size.width/2, 20);
  43. [self addSubview:arrow];
  45. //嵌入内容的UIView
  46. [contentView setFrame:CGRectMake(0,40,contentview.frame.size.width, contentview.bounds.size.height+40)];
  47. [self addSubview:contentview];
  49. //移动的手势
  50. UIPanGestureRecognizer *panRcognize=[[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(handlePan:)];
  51. panRcognize.delegate=self;
  52. [panRcognize setEnabled:YES];
  53. [panRcognize delaysTouchesEnded];
  54. [panRcognize cancelsTouchesInView];
  56. [self addGestureRecognizer:panRcognize];
  58. //单击的手势
  59. UITapGestureRecognizer *tapRecognize = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(handleTap:)];
  60. tapRecognize.numberOfTapsRequired = 1;
  61. tapRecognize.delegate = self;
  62. [tapRecognize setEnabled :YES];
  63. [tapRecognize delaysTouchesBegan];
  64. [tapRecognize cancelsTouchesInView];
  66. [self addGestureRecognizer:tapRecognize];
  68. //设置两个位置的坐标
  69. downPoint = CGPointMake(parentview.frame.size.width/2, parentview.frame.size.height+contentview.frame.size.height/2-40);
  70. upPoint = CGPointMake(parentview.frame.size.width/2, parentview.frame.size.height-contentview.frame.size.height/2-40);
  71. self.center = downPoint;
  73. //设置起始状态
  74. drawState = DrawerViewStateDown;
  75. }
  76. return self;
  77. }
  80. #pragma UIGestureRecognizer Handles
  81. /*
  82. * 移动图片处理的函数
  83. * @recognizer 移动手势
  84. */
  85. - (void)handlePan:(UIPanGestureRecognizer *)recognizer {
  88. CGPoint translation = [recognizer translationInView:parentView];
  89. if (self.center.y + translation.y < upPoint.y) {
  90. self.center = upPoint;
  91. }else if(self.center.y + translation.y > downPoint.y)
  92. {
  93. self.center = downPoint;
  94. }else{
  95. self.center = CGPointMake(self.center.x,self.center.y + translation.y);
  96. }
  97. [recognizer setTranslation:CGPointMake(0, 0) inView:parentView];
  99. if (recognizer.state == UIGestureRecognizerStateEnded) {
  100. [UIView animateWithDuration:0.75 delay:0.15 options:UIViewAnimationOptionCurveEaseOut animations:^{
  101. if (self.center.y < downPoint.y*4/5) {
  102. self.center = upPoint;
  103. [self transformArrow:DrawerViewStateUp];
  104. }else
  105. {
  106. self.center = downPoint;
  107. [self transformArrow:DrawerViewStateDown];
  108. }
  110. } completion:nil];
  112. }
  113. }
  115. /*
  116. * handleTap 触摸函数
  117. * @recognizer UITapGestureRecognizer 触摸识别器
  118. */
  119. -(void) handleTap:(UITapGestureRecognizer *)recognizer
  120. {
  121. [UIView animateWithDuration:0.75 delay:0.15 options:UIViewAnimationOptionTransitionCurlUp animations:^{
  122. if (drawState == DrawerViewStateDown) {
  123. self.center = upPoint;
  124. [self transformArrow:DrawerViewStateUp];
  125. }else
  126. {
  127. self.center = downPoint;
  128. [self transformArrow:DrawerViewStateDown];
  129. }
  130. } completion:nil];
  132. }
  134. /*
  135. * transformArrow 改变箭头方向
  136. * state DrawerViewState 抽屉当前状态
  137. */
  138. -(void)transformArrow:(DrawerViewState) state
  139. {
  140. //NSLog(@"DRAWERSTATE :%d STATE:%d",drawState,state);
  141. [UIView animateWithDuration:0.3 delay:0.35 options:UIViewAnimationOptionCurveEaseOut animations:^{
  142. if (state == DrawerViewStateUp){
  143. arrow.transform = CGAffineTransformMakeRotation(M_PI);
  144. }else
  145. {
  146. arrow.transform = CGAffineTransformMakeRotation(0);
  147. }
  148. } completion:^(BOOL finish){
  149. drawState = state;
  150. }];
  153. }
  155. @end

这样就是实现了，图片是从360里面抠出来，处理的不是很好，大家见谅。

Demo的下载地址：http://download.csdn.net/detail/toss156/4177553

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