效果图.gif

简介

• 控件基于UIView封装完成，采用UIPanGestureRecognizer监听自身的触摸事件，以此处理各种滑动动画操作。
• 内容之间可以循环切换，采用类似tableView加载机制，达到复用效果。

思路设计

整体设计

1. 继承UIView创建一个容器SMSwipeView，用来放当前显示的cell。
2. 在SMSwipeView中实现滑动事件的监听，以此来处理相应的动画效果，以及cell的移除、缓存、载入操作。
3. 创建一个Delegate，用来获取需要显示的数据量，以及获取显示cell的对象。

循环设计

当前下标index假如为0

1. 获取当前的三个要显示的cell，便是0、1、2三个cell，叠加显示在当前容器之中。
2. 滑动到下一个界面情况：index++变为1，那么index=0的cell则显示在左侧不可见的区域，加载index=3的cell，如果此时超出范围则加载index=0的cell。
3. 手势需要返回到上一页的时候，就移除叠加最底层的cell，并载入上上一个cell，如果当前的index=0，则上一个cell应该为最后一个。

图片.png

代码实现

SMSwipeView.h

//定义协议
@protocol SMSwipeDelegate <NSObject>
@required
//获取显示数据内容
-(UITableViewCell*)SMSwipeGetView:(SMSwipeView*)swipe withIndex:(int)index;
//获取数据源总量
-(NSInteger)SMSwipeGetTotaleNum:(SMSwipeView*)swipe;
@end

@interface SMSwipeView : BaseView
@property(nonatomic,weak)id<SMSwipeDelegate> delegate;
-(void)reloadData;//加载方法
-(UITableViewCell*)dequeueReusableUIViewWithIdentifier:(NSString*)identifier;//根据id获取缓存的cell
@end

SMSwipeView.m

//
//  SMSwipeView.m
//  Base
//
//  Created by whbt_mac on 15/12/28.
//  Copyright © 2015年 StoneMover. All rights reserved.
//
//  淘宝滑动特效效果
#import "SMSwipeView.h"

#define degreeTOradians(x) (M_PI * (x)/180)

const int LEFT_RIGHT_MARGIN=10;//childView距离父View左右的距离
const int TOP_MARGTIN=16;//当前view距离父view的顶部的值

@interface SMSwipeView()

@property(nonatomic,weak)UITableViewCell * viewRemove;//已经划动到边界外的一个view

@property(nonatomic,strong)NSMutableArray * cacheViews;//放当前显示的子View的数组

@property(nonatomic,assign)int totalNum;//view总共的数量

@property(nonatomic,assign)int nowIndex;//当前的下标

@property(nonatomic,assign)CGPoint pointStart;//触摸开始的坐标

@property(nonatomic,assign)CGPoint pointLast;//上一次触摸的坐标

@property(nonatomic,assign)CGPoint pointEnd;//最后一次触摸的坐标

@property(nonatomic,weak)UITableViewCell * nowCell;//正在显示的cell

@property(nonatomic,weak)UITableViewCell * nextCell;//下一个cell

@property(nonatomic,weak)UITableViewCell * thirdCell;//第三个cell

@property(nonatomic,assign)int w;//自身的宽度

@property(nonatomic,assign)int h;//自身的高度

@property(nonatomic,assign)BOOL isFirstLayoutSub;//是否是第一次执行

@end

@implementation SMSwipeView

//从xib中加载该类
-(void)awakeFromNib{
    [super awakeFromNib];
    [self initSelf];
}
//直接用方法初始化
-(instancetype)initWithFrame:(CGRect)frame{
    self=[super initWithFrame:frame];
    [self initSelf];
    return self;
}

//进行一些自身的初始化和设置
-(void)initSelf{
    self.clipsToBounds=YES;
    self.cacheViews=[[NSMutableArray alloc]init];
    UIPanGestureRecognizer * pan=[[UIPanGestureRecognizer alloc]initWithTarget:self action:@selector(pan:)];
    [self addGestureRecognizer:pan];
}

//布局subview的方法
-(void)layoutSubviews{
    if(!self.isFirstLayoutSub){
        self.isFirstLayoutSub=YES;
        self.w=self.bounds.size.width;
        self.h=self.bounds.size.height;
        [self reloadData];
    }
    
}

//重新加载数据方法，会再首次执行layoutSubviews的时候调用
-(void)reloadData{
    if (!self.delegate||![self.delegate respondsToSelector:@selector(SMSwipeGetView:withIndex:)]||![self.delegate respondsToSelector:@selector(SMSwipeGetTotaleNum:)]) {
        return;
    }
    self.totalNum=(int)[self.delegate SMSwipeGetTotaleNum:self];
    self.viewRemove=nil;
    UITableViewCell * nowCell=[self.delegate SMSwipeGetView:self withIndex:self.nowIndex];
    UITableViewCell * nextCell=[self.delegate SMSwipeGetView:self withIndex:self.nowIndex+1<self.totalNum?self.nowIndex+1:0];
    UITableViewCell * thirdCell=[self.delegate SMSwipeGetView:self withIndex:self.nowIndex+2<self.totalNum?self.nowIndex+2:self.nowIndex+2-self.totalNum];
    
    [thirdCell removeFromSuperview];
    thirdCell.layer.anchorPoint=CGPointMake(1, 1);
    thirdCell.frame=CGRectMake(LEFT_RIGHT_MARGIN*2, 0, self.w-2*2*LEFT_RIGHT_MARGIN, self.h-TOP_MARGTIN);
    [self addSubview:thirdCell];
    self.thirdCell=thirdCell;
    
    [nextCell removeFromSuperview];
    nextCell.layer.anchorPoint=CGPointMake(1, 1);
    nextCell.frame=CGRectMake(LEFT_RIGHT_MARGIN, TOP_MARGTIN/2*1, self.w-2*LEFT_RIGHT_MARGIN, self.h-TOP_MARGTIN);
    
    [self addSubview:nextCell];
    self.nextCell=nextCell;
    
    [nowCell removeFromSuperview];
    nowCell.layer.anchorPoint=CGPointMake(1, 1);
    nowCell.frame=CGRectMake(0, TOP_MARGTIN, self.w, self.h-TOP_MARGTIN);
    [self addSubview:nowCell];
    self.nowCell=nowCell;
   
    
}





#pragma mark swipe触摸的相关手势处理
-(void)swipe:(UISwipeGestureRecognizer*)sender{
    NSLog(@"swipe");
}

-(void)pan:(UIPanGestureRecognizer*)sender{
    CGPoint translation = [sender translationInView: self];
    //CGPoint speed=[sender velocityInView:self];//获取速度
    if (sender.state==UIGestureRecognizerStateBegan) {
        //NSLog(@"begin");
        self.pointStart=translation;
        self.pointLast=translation;
    }
    
    if (sender.state==UIGestureRecognizerStateChanged) {
        //NSLog(@"change");
//        CGFloat xMove=translation.x-self.pointLast.x;
//        CGFloat yMove=translation.y-self.pointLast.y;
//        self.pointLast=translation;
//        
//        CGPoint center=self.nowCell.center;
//        self.nowCell.center=CGPointMake(center.x+xMove, center.y+yMove);
        
        CGFloat xTotalMove=translation.x-self.pointStart.x;
        if (xTotalMove<0) {
            self.nowCell.transform = CGAffineTransformMakeRotation(degreeTOradians(90*xTotalMove/self.w));
            self.nextCell.transform= CGAffineTransformMakeRotation(degreeTOradians(90*xTotalMove/self.w/2));
        }else{
            self.nowCell.transform = CGAffineTransformMakeRotation(degreeTOradians(0));
            self.nextCell.transform= CGAffineTransformMakeRotation(degreeTOradians(0));
        }
        
    }
    
    if (sender.state==UIGestureRecognizerStateEnded) {
        //NSLog(@"end");
        CGFloat xTotalMove=translation.x-self.pointStart.x;
        if (xTotalMove<0) {
            [self swipeEnd];
        }else{
            [self swipeGoBack];
        }
        
    }
//    NSLog(@"%@%f%@%f",@"x:",speed.x,@"y:",speed.y);
    //NSLog(@"%@%f%@%f",@"x:",translation.x,@"y:",translation.y);
}

/**
 *  @author StoneMover, 16-12-29 14:12:33
 *
 *  @brief 获取为显示的cell,复用机制
 *
 *  @param identifier id标志
 *
 *  @return 返回的cell,如果缓存中没有则返回空
 */
-(UITableViewCell*)dequeueReusableUIViewWithIdentifier:(NSString *)identifier{
    
    for (UITableViewCell * cell in self.cacheViews) {
        if ([identifier isEqualToString:cell.reuseIdentifier]) {
            [self.cacheViews removeObject:cell];
            return cell;
        }
    }
    
    return nil;
}

//滑动到下一个界面
-(void)swipeEnd{
    [UIView animateWithDuration:0.3 animations:^{
        self.nextCell.transform= CGAffineTransformMakeRotation(degreeTOradians(0));
    }];
    
    //self.nowCell.transform= CGAffineTransformMakeRotation(degreeTOradians(0));
    CGPoint center=self.nowCell.center;
    [UIView animateWithDuration:0.3 animations:^{
        self.nowCell.center=CGPointMake(center.x-self.w, center.y);
        self.nowCell.transform= CGAffineTransformMakeRotation(degreeTOradians(0));
//        [self.nowCell setAlpha:0.0];
    } completion:^(BOOL finished) {
        self.nowIndex++;
        self.nowIndex=self.nowIndex<self.totalNum?self.nowIndex:0;
        if (self.viewRemove&&[self isNeedAddToCache:self.viewRemove]) {
            [self.cacheViews addObject:self.viewRemove];
            [self.viewRemove removeFromSuperview];
        }
        self.viewRemove=self.nowCell;
        //self.viewRemove.layer.anchorPoint=CGPointMake(0, 0);
        //self.viewRemove.transform=CGAffineTransformMakeRotation(degreeTOradians(-35));
        
        
        self.nowCell=self.nextCell;
        self.nextCell=self.thirdCell;
        
        UITableViewCell * thirdCell=[self.delegate SMSwipeGetView:self withIndex:self.nowIndex+2<self.totalNum?(int)self.nowIndex+2:(int)self.nowIndex+2-(int)self.totalNum];
        
        [thirdCell removeFromSuperview];
        thirdCell.layer.anchorPoint=CGPointMake(1, 1);
        thirdCell.frame=CGRectMake(LEFT_RIGHT_MARGIN*2, 0, self.w-2*2*LEFT_RIGHT_MARGIN, self.h-TOP_MARGTIN);
        self.thirdCell=thirdCell;
        [self insertSubview:thirdCell belowSubview:self.nextCell];
        
        [UIView animateWithDuration:0.2 animations:^{
            self.nowCell.frame=CGRectMake(0, TOP_MARGTIN, self.w, self.h-TOP_MARGTIN);
            self.nextCell.frame=CGRectMake(LEFT_RIGHT_MARGIN, TOP_MARGTIN/2*1, self.w-2*LEFT_RIGHT_MARGIN, self.h-TOP_MARGTIN);
        }];
    }];
}

//滑动到上一个界面
-(void)swipeGoBack{
    
    if (!self.viewRemove) {
        NSLog(@"!viewRemove");
        return;
    }
    
    if (self.nowIndex==0) {
        NSLog(@"!viewRemove+index");
        return;
    }
    
    CGPoint center=self.viewRemove.center;
    
    self.nowIndex--;
    
//    if ([self isNeedAddToCache:self.thirdCell]) {
//        [self.cacheViews addObject:self.thirdCell];
//    }
    [self.thirdCell removeFromSuperview];
    
    
    self.thirdCell=self.nextCell;
    self.nextCell=self.nowCell;
    self.nowCell=self.viewRemove;
    
    if (self.nowIndex==0) {
        self.viewRemove=nil;
        
    }else{
        UITableViewCell * cell=[self.delegate SMSwipeGetView:self withIndex:(int)self.nowIndex-1];
        [cell removeFromSuperview];
        [self insertSubview:cell aboveSubview:self.nowCell];
        cell.layer.anchorPoint=CGPointMake(1, 1);
        cell.frame=self.viewRemove.frame;
        self.viewRemove=cell;
    }
    
    [UIView animateWithDuration:.5 animations:^{
        self.nowCell.center=CGPointMake(center.x+self.w, center.y);
        self.nowCell.transform= CGAffineTransformMakeRotation(degreeTOradians(0));
        self.nextCell.frame=CGRectMake(LEFT_RIGHT_MARGIN, TOP_MARGTIN/2*1, self.w-2*LEFT_RIGHT_MARGIN, self.h-TOP_MARGTIN);
        self.thirdCell.frame=CGRectMake(LEFT_RIGHT_MARGIN*2, 0, self.w-2*2*LEFT_RIGHT_MARGIN, self.h-TOP_MARGTIN);
    }];
}

//是否需要加入到缓存中去
-(BOOL)isNeedAddToCache:(UITableViewCell*)cell{
    for (UITableViewCell * cellIn in self.cacheViews) {
        if ([cellIn.reuseIdentifier isEqualToString:cell.reuseIdentifier]) {
            
            return NO;
        }
    }
    return YES;
}

@end

代码地址

https://github.com/StoneMover/SMSwipeView.git