iOS 利用SDWebImage做简单的淡入淡出动画

利用SDWebImage做简单的淡入淡出动画：

[self.adImageView sd_setImageWithURL:url completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, NSURL *imageURL) {    self.adImageView.alpha = 0.0;    [UIView transitionWithView:self.adImageView                      duration:1.0                       options:UIViewAnimationOptionTransitionCrossDissolve                    animations:^{                        [self.adImageView setImage:image];                        self.adImageView.alpha = 1.0;                    } completion:NULL];}];