- (instancetype)initWithFrame:(CGRect)frame{    self = [super initWithFrame:frame];    if (self) {        _scrollView = [[UIScrollView alloc] initWithFrame:self.bounds];        [self addSubview:_scrollView];                _cellArray = [NSMutableArray array];                _numberOfColumns = 4;        _spacing=5;        _edgeInset=UIEdgeInsetsMake(20, 0, 20, 0);    }        return self;}- (void)reloadData{    //重新加载数据前需要将老数据清理掉    //获取视图（小格子）的个数    NSInteger count = [_dataSource numberOfViewInPhotoWall:self];        CGFloat width = self.bounds.size.width / _numberOfColumns;    CGFloat height = 44.0f;    if (_dataSource && [_dataSource respondsToSelector:@selector(photoWall:cellHeightAtIndex:)]) {            }        //计算滚动视图的大小(有问题，自己算..... 高度不对)    int heiCount;    if(count%_numberOfColumns)    {        heiCount=count/_numberOfColumns+1;    }    else    {        heiCount=count/_numberOfColumns;    }    _scrollView.contentInset=_edgeInset;    _scrollView.contentSize = CGSizeMake(_scrollView.frame.size.width,heiCount * height);        //总数与index相差1    for (NSInteger i = 0; i < count; i++) {        MyPhotoWallCell *cell = [_dataSource photoWall:self cellAtIndex:i];        [cell addTarget:self action:@selector(didClicked:) forControlEvents:UIControlEventTouchUpInside];        cell.tag = i;        if (_dataSource&&[_dataSource respondsToSelector:@selector(photoWall:cellHeightAtIndex:)]) {            height = [_dataSource photoWall:self cellHeightAtIndex:i];        }        CGFloat y = (i / _numberOfColumns) * height;        NSLog(@"%f--%f", width * i, y);        cell.frame = CGRectMake(width * (i % _numberOfColumns), y, width-_spacing, height-_spacing);        [_scrollView addSubview:cell];    }}- (void)didClicked:(MyPhotoWallCell *)sender{    if (_delegate && [_delegate respondsToSelector:@selector(photoWall:didSelectedIndex:)]) {        [_delegate photoWall:self didSelectedIndex:sender.tag];    }}////  ViewController.m//  MyCustomPhotoWall////  Created by apple on 14-8-22.//  Copyright (c) 2014年 戴维营教育. All rights reserved.//#import "ViewController.h"#import "MyPhotoWallCell.h"#import "MyPhotoWall.h"@interface ViewController () <MyPhotoWallDataSource, MyPhotoWallDelegate>@end@implementation ViewController            - (void)viewDidLoad {    [super viewDidLoad];        MyPhotoWall *photoWall = [[MyPhotoWall alloc] initWithFrame:CGRectMake(10, 10, 300, 460)];    photoWall.backgroundColor = [UIColor redColor];    photoWall.dataSource = self;    photoWall.delegate = self;    [self.view addSubview:photoWall];        [photoWall reloadData];}- (void)didReceiveMemoryWarning {    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}- (NSInteger)numberOfViewInPhotoWall:(MyPhotoWall *)photoWall{    return 100;}- (CGFloat)photoWall:(MyPhotoWall *)photoWall cellHeightAtIndex:(NSInteger)index{    if (index%2) {        return 94;    }    else    {        return 55;    }    }- (MyPhotoWallCell *)photoWall:(MyPhotoWall *)photoWall cellAtIndex:(NSInteger)index{    MyPhotoWallCell *cell = [[MyPhotoWallCell alloc] init];        if (index % 3) {        cell.backgroundColor = [UIColor purpleColor];    }    else if (index % 2) {        cell.backgroundColor = [UIColor magentaColor];    }    else {        cell.backgroundColor = [UIColor cyanColor];    }    //    if (index % 2) {//        cell.backgroundColor = [UIColor purpleColor];//    }//    else {//        cell.backgroundColor = [UIColor cyanColor];//    }    return cell;}- (void)photoWall:(MyPhotoWall *)photoWall didSelectedIndex:(NSInteger)index{    NSLog(@"Selected: %d", index);}@end