iphone ARC - 如何将对象设置为零？
我有一些逻辑来测试一个对象是否为零，如何将其设置为零？
喜欢：
// in some method
if (true){
[self myObj] = [[myObj alloc]init];
} else{
[self myObject] = nil; //??? How to do this with Automatic Ref. Counting
}
// elsewhere
if([self myObj]){
}
I have some logic that test if an object is nil or not, how can I set it to nil?
Like:
// in some method
if (true){
[self myObj] = [[myObj alloc]init];
} else{
[self myObject] = nil; //??? How to do this with Automatic Ref. Counting
}
// elsewhere
if([self myObj]){
}
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评论（4）
您的代码不正确。
您需要使用属性并为其赋值，例如
[self setMyObject:nil];或[self setMyObj:[[myObj alloc] init]];。Your code is incorrect.
You need to use properties and assign values to them, like
[self setMyObject:nil];or[self setMyObj:[[myObj alloc] init]];.你的代码是错误的。尝试：
另外，请确保 myObject 是您的类中的属性，否则使用 self 将不起作用。
Your code is wrong. Try:
Also, make sure that myObject is a property in your class, otherwise using self won't work.
[self myObj]不可赋值，因为它不是左值。要解决此问题，请引用基础变量，例如self->myObj，或者在使用属性时使用[self setMyObj:]。[self myObj]is not assignable, as it is not a lvalue. To fix this, either reference the underlying variable, e.g.self->myObj, or use[self setMyObj:]if you are using properties.您正在使用 getter 作为 setter。那是行不通的。应该是
并且
假设您已经实现了设置器。在 ARC 下，如果您只是访问 ivar，则实际上不需要这样做 - 您可以直接访问它，并且将为您完成引用计数：
并且
将为您设置和删除所有内容。
You are using a getter as a setter. That isn't going to work. It should be
And
Assuming you have implemented the setters. Under ARC you don't really need to if you are just accessing an ivar - you can access it directly and the reference counting will be done for you:
And
Will set and remove everything for you.