Property 'xxx' not found on object of type 'yyy'

I upgraded to xcode 4.0 and am now getting this error when I compile:

"Property 'xxx' not found on object开发者_JS百科 of type 'yyy'"

where xxx is a property and yyy is my delegate.

I'm trying to set the property xxx on the delegate object as follows:

self.delegate.xxx=@"abc"

Does anyone know why this would not be working now with xcode 4.0? It was fine with xcode 3.x.

I'm also getting this compile error:

"Expression is no assignable - type of receiver is unknown"

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I'm guessing your delegate is of type id? If so, the compiler doesn't have enough information to safely let you do this. You need to cast your delegate to a type that is expecting to have a property xxx. I also find . notation more warning-prone. Maybe something like this:

[(YourObj *)self.delegate setXXX:@"abc"];