IOS模拟动态图 大图和小图动态切换

NSInteger index = 0;
for (ONRadioGiftsModel *gift in _gifts) {
if ([gift.isLost isEqualToString:@"0" ]) {
_isShow = YES;

UIImageView*gifImageView=[[UIImageView alloc]initWithFrame:CGRectMake(imageViewMargin*(index+1)+giftsImageW*index,imageViewMargin, 50, 50)];
gifImageView.userInteractionEnabled = YES;
gifImageView.contentMode=UIViewContentModeScaleAspectFit;

[gifImageView sd_setImageWithURL:[NSURL URLWithString:gift.giftInfo.giftPicPath] completed:^(UIImage *image, NSError *error, EMSDImageCacheType cacheType, NSURL *imageURL) {

//生成小的缩略图
UIImage *image3 = [self thumbnailWithImageWithoutScale:image size:CGSizeMake(image.size.width-30, image.size.height-30)];
NSArray*gifArray=[[NSArray alloc]initWithObjects:image,image3, nil];
gifImageView.animationImages=gifArray;
gifImageView.animationDuration=2;
gifImageView.animationRepeatCount=MAXFLOAT;
[gifImageView startAnimating];

UIButton *btn = [[UIButton alloc]initWithFrame:gifImageView.bounds];
btn.tag = index;
btn.backgroundColor = [UIColor clearColor];
[btn addTarget:self action:@selector(giftBtnAction:) forControlEvents:UIControlEventTouchUpInside];
[gifImageView addSubview:btn];

[self addSubview:gifImageView];

}];
index++;
// UIButton *giftBtn = [[UIButton alloc]initWithFrame:CGRectMake(index*giftBtnW, 0, giftBtnW, self.height)];
// giftBtn.contentMode = UIControlContentHorizontalAlignmentCenter;
// giftBtn.tag = index;
// [giftBtn sd_setBackgroundImageWithURL:[NSURL URLWithString:gift.giftInfo.giftPicPath] forState:UIControlStateNormal];
// [giftBtn addTarget:self action:@selector(giftBtnAction:) forControlEvents:UIControlEventTouchUpInside];
}

}