Obj-C ARC：如何从数组/集中删除对象，然后将其作为自动释放的对象返回？

Question

如何为ARC重写此方法？

- (KTThumbView *)dequeueReusableThumbView
{
    KTThumbView *thumbView = [reusableThumbViews_ anyObject];
    if (thumbView != nil) {
        // The only object retaining the view is the
        // reusableThumbViews set, so we retain/autorelease
        // it before returning it so that it's not immediately
        // deallocated when removed form the set.
        [[thumbView retain] autorelease];
        [reusableThumbViews_ removeObject:thumbView];
    }
    return thumbView;
}

自动ARC迁移器给我这个错误：

[rewriter] it is not safe to remove an unused 'autorelease' message; its receiver may be destroyed immediately

Answer 1

只需删除[[thumbView retain] autorelease]; 线。 第一行将作为有力的参考，以确保在需要时在其周围进行。