如何为ivar写我自己的setter，即:self.ivar = ...? [英] How to write my own setter for an ivar, i.e.: self.ivar = ...?

问题描述

这是以下问题的后续问题: self.ivar和ivar之间有区别吗? :

This is a follow-up question of: Difference between self.ivar and ivar? :

self.name = @"hello";

我想知道在 magical setter方法内进行的操作.因此，问题是:有人可以发布setter方法的源代码吗? ;-)谢谢！

I would like to know what is done inside the magical setter method. So the question is: could anyone please post the source code of the setter method? ;-) Thanks!

推荐答案

如果没有属性声明(也就是说，您已经手动声明了setter和getter方法)，则通常可以这样实现它们:

Without a property declaration (that is, you have manually declared the setter and getter methods), you'd typically implement them like this:

@interface MyClass : NSObject
{
    NSString *name;
}
- (NSString *) name;
- (void) setName:(NSString *) name;
@end

@implementation MyClass

- (void) dealloc
{
    [name release];
    [super dealloc];
}

- (NSString *) name
{
    return name;
}

- (void) setName:(NSString *) aName
{
    if (aName != name)
    {
        [name release];
        name = [aName retain];
    }
}

@end

原子二传手可能看起来像这样:

Atomic setters could look something like this:

- (void) setName:(NSString *) aName
{
    @synchronized(self)
    {
        if (aName != name)
        {
            [name release];
            name = [aName retain];
        }
    }
}

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