SDWebImage有种情况并不需要把self改为weakSelf

看下面代码

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    NSString *urlString = @"http://img.hb.aicdn.com/154fc0b70d9693759e9d66861b15e920f7d3d16648e10-9MxqJz_fw658";
    [self.imageView sd_setImageWithURL:[NSURL URLWithString:urlString] completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, NSURL *imageURL) {
        self.imageView.image = image;
    }];
}

发现有人在使用时会把- (void)sd_setImageWithURL:(NSURL *)url completed:(SDWebImageCompletionBlock)completedBlock方法里的self改为weakSelf，防止RetainCycle.

其实根本不用改，因为self.imageView并不持有completedBlock。（因为最近看了一些SDWebImage的源码才知道的）。

我自己写了个简单DEMO也证实直接用self，并不会导致RetainCycle。

Written on March 26, 2015