Assignments using objectAtIndex

Why would this work:

firstItem = @"Some value";

And this result in an error when I try to acces开发者_StackOverflow中文版s the NSString firstItem property:

NSArray *values = [dict allVaues];
firstItem = (NSString *)[values objectAtIndex:0];

From the .m:

@synthesize firstItem;

From the .h

NSString *firstItem;
@property (nonatomic, retain) IBOutlet NSString *firstItem;

NOTE: If I NSLog from the method I set this property it shows the correct values for the erring example, but later on the data is not available. I assume I need to set the values explicitly and not as references to my NSMutableDictionary that is out of scope. Any advice?

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Your issue is you're not actually using the property. You're assigning the ivar directly instead. If you change your @synthesize line to say

@synthesize firstItem=_firstItem;

then you'll notice that your code using firstItem will no longer compile. That's a good sign that you're inadvertently ignoring the property accessors. You should be using self.firstItem = foo instead.