保留，重用，发布？

Question

我有一系列按钮，每个按钮使用不同的图像。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];

或者我是否需要为传递给每个按钮的UIImage的每个图像创建一个新的setBackgroundImage:，并依赖于自动释放而不是保留的UIImage。以上工作，但我不确定如何将这些按钮的图像设置为同一图像将影响保留计数。

Answer 1

你所拥有的东西会泄漏（因为你失去了对第一张图像的引用）并且崩溃（因为你release是你不拥有的对象）。如果您移除-retain和-release，您的代码就可以正常使用。