UICollectionViewController 实现利用手势滑动选择

代码例子：http://pan.baidu.com/s/1bn06eOf   http://download.csdn.net/detail/qqmcy/6887385

Cell.h

#import <UIKit/UIKit.h>@interface Cell : UICollectionViewCell@property (strong, nonatomic) UILabel* label;@end

Cell.m

////  Cell.m//  CollectionViewDemo1////  Created by 杜甲 on 14-1-26.//  Copyright (c) 2014年 杜甲. All rights reserved.//#import "Cell.h"@implementation Cell- (id)initWithFrame:(CGRect)frame{    self = [super initWithFrame:frame];    if (self) {        // Initialization code        self.contentView.frame = CGRectMake(0, 0, 50, 15);                self.label = [[UILabel alloc] initWithFrame:CGRectMake(0.0, 0.0, 50.0, 15)];        self.label.autoresizingMask = UIViewAutoresizingFlexibleHeight|UIViewAutoresizingFlexibleWidth;        self.label.textAlignment = NSTextAlignmentCenter;        self.label.font = [UIFont boldSystemFontOfSize:15];        self.label.textColor = [UIColor colorWithRed:181.0 / 255.0 green:181.0 / 255.0 blue:181.0 / 255.0 alpha:1];        [self.contentView addSubview:self.label];                    }    return self;}@end

LineLayout.h

#import <UIKit/UIKit.h>@interface LineLayout : UICollectionViewFlowLayout@end

LineLayout.m

#import "LineLayout.h"#define ITEM_SIZE 20@implementation LineLayout#define ACTIVE_DISTANCE 100#define ZOOM_FACTOR 0-(id)init{    self = [super init];    if (self) {        self.itemSize = CGSizeMake(50, 15);        self.scrollDirection = UICollectionViewScrollDirectionVertical;        self.sectionInset = UIEdgeInsetsMake(50, 30.0, 0, 50.0);        self.minimumLineSpacing = 10;        self.minimumInteritemSpacing = 70;        self.collectionView.backgroundColor = [UIColor whiteColor];    }    return self;}

MyViewController.h

#import <UIKit/UIKit.h>@interface MyViewController : UICollectionViewController@property (strong , nonatomic) NSArray* m_provinceArr;@property (strong , nonatomic) NSIndexPath * m_lastAccessed;@end

MyViewController.m

////  MyViewController.m//  CollectionViewDemo1////  Created by 杜甲 on 14-1-26.//  Copyright (c) 2014年 杜甲. All rights reserved.//#import "MyViewController.h"#import "Cell.h"@interface MyViewController ()@end@implementation MyViewController- (void)viewDidLoad{    [super viewDidLoad];// Do any additional setup after loading the view.    self.m_provinceArr = @[@"北京",@"天津",@"上海",@"重庆",@"河北",@"山西",@"河北",@"辽宁",@"吉林",@"黑龙江",@"河北",@"江苏",@"浙江",@"安徽",@"福建",@"江西",@"山东",@"河南",@"湖北",@"湖南",@"广东",@"海南",@"四川",@"贵州",@"云南",@"陕西",@"甘肃",@"青海",@"西藏",@"广西",@"内蒙",@"宁夏",@"新疆"];    self.view.frame = CGRectMake(0, 0, 275, 640);    self.collectionView.allowsMultipleSelection = YES;    self.collectionView.backgroundColor = [UIColor grayColor];    [self.collectionView registerClass:[Cell class] forCellWithReuseIdentifier:@"MY_CELL"];            UIPanGestureRecognizer* panGesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panGesture:)];    [self.collectionView addGestureRecognizer:panGesture];        }-(void)panGesture:(UIGestureRecognizer*)gestureRecognizer{    float pointerX = [gestureRecognizer locationInView:self.collectionView].x;    NSLog(@"pointerX = %f",pointerX);    float pointerY = [gestureRecognizer locationInView:self.collectionView].y;    for(Cell* cell1 in self.collectionView.visibleCells) {        float cellLeftTop = cell1.frame.origin.x;        NSLog(@"cellLeftTop = %f",cellLeftTop);        float cellRightTop = cellLeftTop + cell1.frame.size.width;        float cellLeftBottom = cell1.frame.origin.y;        float cellRightBottom = cellLeftBottom + cell1.frame.size.height;                if (pointerX >= cellLeftTop && pointerX <= cellRightTop && pointerY >= cellLeftBottom && pointerY <= cellRightBottom) {            NSIndexPath* touchOver = [self.collectionView indexPathForCell:cell1];            if (self.m_lastAccessed != touchOver) {                [cell1.label setTextColor:[UIColor redColor]];                                if (cell1.selected) {                    [self deselectCellForCollectionView:self.collectionView atIndexPath:touchOver];                }                else                {                                        [self selectCellForCollectionView:self.collectionView atIndexPath:touchOver];                                    }            }                        self.m_lastAccessed = touchOver;                    }    }    if (gestureRecognizer.state == UIGestureRecognizerStateEnded) {        self.m_lastAccessed = nil;        self.collectionView.scrollEnabled = YES;    }    }- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath{    Cell* cell = (Cell*)[collectionView cellForItemAtIndexPath:indexPath];        [cell.label setTextColor:[UIColor redColor]];                   NSLog(@"indexPath.item = %d",indexPath.item);}/*Cell已经选择时回调*/-(void)collectionView:(UICollectionView *)collectionView didDeselectItemAtIndexPath:(NSIndexPath *)indexPath{    Cell* cell = (Cell*)[collectionView cellForItemAtIndexPath:indexPath];    [cell.label setTextColor:[UIColor colorWithRed:181.0 / 255.0 green:181.0 / 255.0 blue:181.0 / 255.0 alpha:1]];}/*Cell未选择时回调*/-(void)selectCellForCollectionView:(UICollectionView*)collection atIndexPath:(NSIndexPath*)indexPath{    [collection selectItemAtIndexPath:indexPath animated:YES scrollPosition:UICollectionViewScrollPositionNone];        [self collectionView:collection didSelectItemAtIndexPath:indexPath];}-(void)deselectCellForCollectionView:(UICollectionView*)collection atIndexPath:(NSIndexPath*)indexPath{    [collection deselectItemAtIndexPath:indexPath animated:YES];    [self collectionView:collection didDeselectItemAtIndexPath:indexPath];    }- (NSInteger)collectionView:(UICollectionView *)view numberOfItemsInSection:(NSInteger)section;{    return [self.m_provinceArr count];}- (UICollectionViewCell *)collectionView:(UICollectionView *)cv cellForItemAtIndexPath:(NSIndexPath *)indexPath;{    Cell *cell = [cv dequeueReusableCellWithReuseIdentifier:@"MY_CELL" forIndexPath:indexPath];    cell.label.text = [NSString stringWithFormat:@"%@",[self.m_provinceArr objectAtIndex:indexPath.item]];    return cell;}-(BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation {    return UIInterfaceOrientationIsLandscape(toInterfaceOrientation);}- (void)didReceiveMemoryWarning{    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}@end

ViewController.h

#import <UIKit/UIKit.h>#import "MyViewController.h"@interface ViewController : UIViewController@property (strong , nonatomic) MyViewController* m_v;@end

ViewController.m

////  ViewController.m//  CollectionViewDemo1////  Created by 杜甲 on 14-1-26.//  Copyright (c) 2014年 杜甲. All rights reserved.//#import "ViewController.h"#import "LineLayout.h"@interface ViewController ()@end@implementation ViewController- (void)viewDidLoad{    [super viewDidLoad];// Do any additional setup after loading the view, typically from a nib.        LineLayout* lineLayout = [[LineLayout alloc] init];        self.m_v = [[MyViewController alloc] initWithCollectionViewLayout:lineLayout];    [self.view addSubview:self.m_v.view];}- (void)didReceiveMemoryWarning{    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}@end