Question

in my view controller.m i have a string like this

 NSString *valueToSave = @"someValue";

and would like to safe the text with NSUserDefauls in Appdelegate.m

 [[NSUserDefaults standardUserDefaults]
 setObject:valueToSave forKey:@"preferenceName"];

how can i use the NSString in the other file?
This doesn’t work:

#import "viewcontroller.m";

Answer 1

In a header file have extern NSString *valueToSave;. Then in a (1 and only 1) .m file have NSString *valueToSave = @"someValue";

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A second option would be to use a #define. Simply put #define kValueToSave (@"someValue") in a header file and use it where you need it.