Obj-C ARC：如何從數組/集中刪除對象，然后將其作為自動釋放的對象返回？

Question

如何為ARC重寫此方法？

- (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;
}

自動ARC遷移器給我這個錯誤：

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

Answer 1

只需刪除[[thumbView retain] autorelease]; 線。 第一行將作為有力的參考，以確保在需要時在其周圍進行。