Question

我有大约272层图像用于动画我的视图背景。下面是关于如何为图像设置动画的示例代码。但这样做我得到内存问题和应用程序崩溃。有什么建议吗？

NSMutableArray *imagesArray = [NSMutableArray array];

for (int i = 272; i >=1; i--)
{
    NSString *imageName = [NSString stringWithFormat:@"layer-%d.jpg", i];
    UIImage *bgImage =[UIImage imageNamed:imageName];

    [imagesArray addObject:bgImage];
}

[self.bgImageView setAnimationDuration:7.0f];
[self.bgImageView  setAnimationImages:imagesArray];
[self.bgImageView  startAnimating];

Answer 1

使用[UIImage imageNamed：]将图像缓存在内存中，尝试使用[UIImage imageWithContentOfFile：]。请检查此answer

Answer 2

添加到数组后尝试使用uiimage的释放对象：

NSMutableArray *imagesArray = [NSMutableArray array];
for (int i = 272; i >=1; i--)
{
    NSString *imageName = [NSString stringWithFormat:@"layer-%d.jpg", i];
    UIImage *bgImage =[UIImage imageNamed:imageName];
    [imagesArray addObject:bgImage];
    bgImage=nil;
    imageName=nil;
 }
    [self.bgImageView setAnimationDuration:7.0f];
    [self.bgImageView  setAnimationImages:imagesArray];
    [self.bgImageView  startAnimating];

或尝试在外循环中声明uiimage并在每个循环中重用它：

NSMutableArray *imagesArray = [NSMutableArray array];
UIImage  *bgImage;
NSString *imageName;
for (int i = 272; i >=1; i--)
{
    imageName = [NSString stringWithFormat:@"layer-%d.jpg", i];
    bgImage =[UIImage imageNamed:imageName];
    [imagesArray addObject:bgImage];
 }
    [self.bgImageView setAnimationDuration:7.0f];
    [self.bgImageView  setAnimationImages:imagesArray];
    [self.bgImageView  startAnimating];

动画许多图像时的内存问题

2 个答案: