使用SDWebImage淡入淡出的方式加载图片

//
//  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"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    NSString *picUrl = @"http://th04.deviantart.net/fs70/PRE/i/2014/277/4/b/cheetahr_by_harpiya-d81l8iv.jpg";
    
    UIImageView *imageView = [[UIImageView alloc] initWithFrame:self.view.bounds];
    [self.view addSubview:imageView];
    
    [imageView setImageWithURL:[NSURL URLWithString:picUrl]
              placeholderImage:nil
                       options:SDWebImageCacheMemoryOnly
                      progress:^(NSInteger receivedSize, NSInteger expectedSize) {
                          NSLog(@"%.2f", (float)receivedSize / (float)expectedSize);
                      }
                     completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType) {
                         
                     }];
}

@end