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原标题:assign NSString

我有一个叫做“估算”的国家统计系统,其名称为:

 animation=[rowInDataBase objectAtIndex:2] ;
 NSLog(@"animation:%@",animation);

当我试图做以下工作时:

previousAnimation=animation;

The previousAnimation is assigned ccsprite.
When I try to logging previousAnimation to check its value with NSLog(@"previous-animation:%@",previousAnimation);, the application crashes unless previousAnimation is NULL

在我的任务中,我做了什么错误?

最佳回答

你们是否试图复制这幅画? 如果是,请:

NSString* previousAnimation = [NSString stringWithString:animation]; // autoreleased

NSString* previousAnimation = [animation copy]; // retain count 1, need to release

否则,你就应当保留。

previousAnimation = [animation retain];

此前 您何时做。

问题回答

www.un.org/Depts/DGACM/index_french.htm 您应为<代码>animation <>/code>和previousAnimation设定一个财产,并按此规定。

self.animation = [rowInDatabase objectAtIndex:2];
...
self.previousAnimation = self.animation;

现在,在你不再面临坠毁问题的电话之间将适当保留这两个数值。 只记得在<代码>dealloc中公布这两种数值。

就像你重新分配已经释放的变量一样,因此,记忆被其他一些随机物体重新使用(如果你提到的话,可能就是一个物体)。 但是,如果不在更大范围内看到该守则,就难以确保。





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