默认情况下，Objective-C中的实例变量设置为nil？ [英] Are instance variables set to nil by default in Objective-C?

问题描述

我在整理我的iPhone应用程序的一些内存问题，我刚刚考虑一些基础。如果我设置一个ivar，从来没有最终使用它在我的对象的生命周期，当我调用dealloc它，将导致一个问题？例如

I'm sorting out some memory issues with my iPhone app and I've just been thinking about some basics. If I setup an ivar and never end up using it in the lifespan of my object, when I call dealloc on it, will that cause a problem? E.g.

@interface testClass {
    id myobject;
}
@property (nonatomic, retain) id myobject;
@end

@implementation testClass
@synthesize myobject;
- (id)init {
    ...
    // Do I have to set myobject to nil here?
    // So if myobject isn't used the dealloc call to nil
    // will be okay? Or can you release the variable without
    // having set every object to nil that you may may not use 
    ...
}

...

// Somewhere in the code, myobject may be set to
// an instance of an object via self.myobject = [AnObject grabAnObject]
// but the object may be left alone

...

- (void)dealloc {
    [myobject release];
    [super dealloc];
}
@end

推荐答案

实例变量初始化为0 。

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