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Assigning to 'AppDelegate *' from incompatible type 'id<UIApplicationDelegate>'

2015-12-20 21:47 691 查看
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In my project it says Assigning to 'AppDelegate *' from incompatible type 'id'.

May I know what exactly this? Why this warning occurred?

I have declared in .m
AppDelegate *appdev;


and in viewDidLoad
{
appdev = [[UIApplication sharedApplication]delegate];     <= warning here
}


I want to hide this warning. What should I do? Thanks in advance.
===========================================================================

since you know they equal, add a cast to let the compiler know
appdev = (AppDelegate*)[[UIApplication sharedApplication]delegate];
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