如何正确地重新定义自我,同时避免“多个方法命名…”警告?

The Objective-C Programming Language: Defining a Class “重新定义self”一节建议类方法allocate和return实例只使用“self”来分配实例,然后只引用该实例。因此,我有许多子类,它们的类方法如下:

+ (id)scrollViewWithFrame: (NSRect)rectFrame
{
    id newInstance = [[[self alloc] initWithFrame:rectFrame] autorelease];
    [newInstance setHasHorizontalScroller: YES];
    [newInstance setHasVerticalScroller: YES];
    [newInstance setBorderType: NSNoBorder];
    [newInstance setAutoresizingMask: (NSViewWidthSizable
                | NSViewHeightSizable)];

    return newInstance;
}