iphone - Image file name stored in a constant -

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i have tableview image in each cell. i'm pulling data each cell plist including textlabel detailtextlabel , image file name. using 

cell.imageview.image = [uiimage imagenamed:image_key];

the image_key constant set image. doesn't work. work if type image file name in message. have double checked file name stored in plist , double checked declaration inside of constants file. spelled correctly. there different way use constants set image?

do this:

 #define image_key "apple.jpg" //

now:

 cell.imageview.image = [uiimage imagenamed:@image_key];

if

 #define image_key @"apple.jpg" //

now:

 cell.imageview.image = [uiimage imagenamed:image_key];

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