Difference between [object variable] and object.variable in Obj-C?
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by John Smith
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Published on 2010-06-10T23:42:43Z
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2010/06/10
23:52 UTC
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I was working on a program today and hit this strange bug. I had a UIButton with an action assigned. The action was something like:
-(void) someaction:(id) e
{
if ([e tag]==SOMETAG)
{
//dostuff
}
}
What confuses me is that when I first wrote it, the if line was
if (e.tag==SOMETAG)
XCode refused to compile it, saying
error: request for member 'tag' in 'e', which is of non-class type 'objc_object*'
but I thought the two were equivalent.
So under what circumstances are they not the same?
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