测试SDWebImage淡入淡出效果在UITableView中的重用显示问题

//
//  ImageCell.h
//  SDWebImageFade
//
//  Created by YouXianMing on 14-10-5.
//  Copyright (c) 2014年 YouXianMing. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface ImageCell : UITableViewCell

@property (nonatomic, strong) UIImageView *bigImageView;

@end

//
//  ImageCell.m
//  SDWebImageFade
//
//  Created by YouXianMing on 14-10-5.
//  Copyright (c) 2014年 YouXianMing. All rights reserved.
//

#import "ImageCell.h"

@implementation ImageCell

- (instancetype)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier
{
    self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
    if (self) {
        _bigImageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 250, 400)];
        [self addSubview:_bigImageView];
    }
    return self;
}

- (void)setSelected:(BOOL)selected animated:(BOOL)animated {
    [super setSelected:selected animated:animated];

    // Configure the view for the selected state
}

@end

//
//  ViewController.m
//  SDWebImageFade
//
//  Created by YouXianMing on 14-10-5.
//  Copyright (c) 2014年 YouXianMing. All rights reserved.
//

#import "ViewController.h"
#import "UIImageView+WebCache.h"
#import "ImageCell.h"

@interface ViewController ()<UITableViewDataSource, UITableViewDelegate>

@property (nonatomic, strong) UITableView  *tableView;
@property (nonatomic, strong) NSArray      *dataArray;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    NSLog(@"%@", NSHomeDirectory());
    
    _dataArray = @[@"http://fc04.deviantart.net/fs70/f/2014/277/d/d/swan_song_by_lilyas-d81jjz1.jpg",
                   @"http://fc08.deviantart.net/fs71/f/2013/103/8/d/8ddafeb73b9e146eef84cc0d45b4fe32-d61mj0f.jpg",
                   @"http://fc08.deviantart.net/fs70/f/2013/120/8/1/pulsatilla_vulgaris_600_by_lilyas-d63la7p.jpg",
                   @"http://fc01.deviantart.net/fs71/f/2012/160/c/0/c0690c165b549cc08b006943fcbcb542-d52u5nk.jpg",
                   @"http://fc03.deviantart.net/fs71/f/2012/199/5/9/5978d4f115b1a70ed0cf6da4dc0cd164-d57qdzg.jpg",
                   @"http://fc05.deviantart.net/fs70/f/2013/292/c/e/evening_star_by_lilyas-d6r3698.png",
                   @"http://fc08.deviantart.net/fs70/i/2014/112/6/b/late_night_rose_by_lilyas-d63iu9y.jpg"];
    
    _tableView = [[UITableView alloc] initWithFrame:self.view.bounds
                                              style:UITableViewStylePlain];
    _tableView.delegate   = self;
    _tableView.dataSource = self;
    [self.view addSubview:_tableView];
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return [_dataArray count];
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *flag = @"YouXianMing";
    ImageCell *cell = [tableView dequeueReusableCellWithIdentifier:flag];
    if (cell == nil) {
        cell = [[ImageCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:flag];
        cell.selectionStyle = UITableViewCellSelectionStyleNone;
    }
    
    NSString *urlStr = _dataArray[indexPath.row];
    [cell.bigImageView setImageWithURL:[NSURL URLWithString:urlStr]
                      placeholderImage:nil
                               options:SDWebImageCacheMemoryOnly];
    
    return cell;
}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    return 400;
}

@end