好像最近，看到好多Android上的抽屜效果，也忍不住想要自己寫一個。在Android裏面可以用SlidingDrawer，很方便的實現。IOS上面就只有自己寫了。其實原理很簡單就是 UIView 的移動，和一些手勢的操作。
//
// 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; //抽屜裏面顯示的內容
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;
//一定要開啓
[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];
//設置兩個位置的座標
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
這樣就是實現了，圖片是從360裏面摳出來，處理的不是很好，大家見諒。