+(void)setup {
UIImage* spriteSheet = [UIImage imageNamed:@"mySpriteSheet.png"];
CGRect rect;
animation = [NSMutableArray arrayWithCapacity:numberOfFramesInSpriteSheet];
int frameCount = 0;
for (int row = 0; row < numberFrameRowsInSpriteSheet; row++) {
for (int col = 0; col < numberFrameColsInSpriteSheet; col++) {
frameCount++;
if (frameCount <= numberOfFramesInSpriteSheet) {
rect = CGRectMake(col*frameHeight,row*frameWidth,frameHeight,frameWidth);
[animation addObject:[UIImage imageWithCGImage:CGImageCreateWithImageInRect(spriteSheet.CGImage,rect)] ];
}
}
}
}
在启用ARC的情况下编译上面的代码. Analyze工具报告可能的内存泄漏,因为imageWithCGImage ::返回计数为1的UIImage,然后引用丢失.泄漏仪器报告根本没有内存泄漏.这里发生了什么？
此外,由于ARC禁止使用手动释放等,如何修复泄漏？
感谢任何能提供任何建议的人.
解决方法
ARC不管理C类型,可以考虑CGImage.完成CGImageRelease(图像)后,必须手动释放引用;
+(void)setup {
UIImage* spriteSheet = [UIImage imageNamed:@"mySpriteSheet.png"];
CGRect rect;
animation = [NSMutableArray arrayWithCapacity:numberOfFramesInSpriteSheet];
int frameCount = 0;
for (int row = 0; row < numberFrameRowsInSpriteSheet; row++) {
for (int col = 0; col < numberFrameColsInSpriteSheet; col++) {
frameCount++;
if (frameCount <= numberOfFramesInSpriteSheet) {
rect = CGRectMake(col*frameHeight,frameWidth);
//store our image ref so we can release it later
//The create rule says that any C-interface method with "create" in it's name
//returns a +1 foundation object,which we must release manually.
CGImageRef image = CGImageCreateWithImageInRect(spriteSheet.CGImage,rect)
//Create a UIImage from our ref. It is now owned by UIImage,so we may discard it.
[animation addObject:[UIImage imageWithCGImage:image]];
//Discard the ref.
CGImageRelease(image);
}
}
}
}
