objective-c - 保留、再利用、释放？

Question

我有一系列按钮，每个按钮都使用不同的图像。我可以重复使用如下所示的保留变量：

// set images
UIImage *image = [[dice1 backgroundImageForState:UIControlStateHighlighted] retain];
[dice1 setBackgroundImage:image forState:(UIControlStateHighlighted|UIControlStateSelected)];
image = [dice2 backgroundImageForState:UIControlStateHighlighted];
[dice2 setBackgroundImage:image forState:(UIControlStateHighlighted|UIControlStateSelected)];
image = [dice3 backgroundImageForState:UIControlStateHighlighted];
[dice3 setBackgroundImage:image forState:(UIControlStateHighlighted|UIControlStateSelected)];
image = [dice4 backgroundImageForState:UIControlStateHighlighted];
[dice4 setBackgroundImage:image forState:(UIControlStateHighlighted|UIControlStateSelected)];
image = [dice5 backgroundImageForState:UIControlStateHighlighted];
[dice5 setBackgroundImage:image forState:(UIControlStateHighlighted|UIControlStateSelected)];
image = [dice6 backgroundImageForState:UIControlStateHighlighted];
[dice6 setBackgroundImage:image forState:(UIControlStateHighlighted|UIControlStateSelected)];
[image release];

还是我需要为UIImage传递给每个按钮的每个图像创建一个新图像，setBackgroundImage:并依赖自动释放而不是保留的 UIImage。上述方法有效，但我不确定将每个按钮的图像设置为相同图像将如何影响保留计数。

Answer 1

你在那里的东西会泄漏（因为你失去了对第一张图片的引用）和崩溃（因为你release是一个你不拥有的对象）。如果您删除-retain和-release，您的代码将正常工作。