objective-c - Objective-C 弧 : How to remove an object from an array/set and then return it as an autoreleased object?

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]; 行。第一行将提供一个强有力的引用，保证其在需要时出现。