iOS - 使用Core Animation中的CATranstion实现背景自然渐变

gistfile1.txt

NSString *imgUrl = _dataArray[index][@"url"];  //下一张背景图url
UIImage *placeHolder = _baseImgView.image;     //使用上一张背景图作为placeholder
[_baseImgView sd_setImageWithURL:[NSURL URLWithString:imgUrl] placeholderImage:placeHolder completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, NSURL *imageURL) {
        if (image) 
            CATransition *transition = [CATransition animation];
            transition.type = kCATransitionFade;
            transition.duration = 1.0f;
            transition.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
            [_baseImgView.layer addAnimation:transition forKey:nil];

            _baseImgView.image = [[image blurImage] jy_lucidImage];
        }
}];