Delegates, and Object properties are null

Question

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CGRect frame = CGRectMake( 0, 0, 100, 100 );
_svContainer = [ [ UIScrollView alloc ] initWithFrame:frame ];
_svContainer.pagingEnabled = YES;
_svContainer.scrollEnabled = YES;
_svContainer.showsHorizontalScrollIndicator = NO;
_svContainer.showsVerticalScrollIndicator = NO;
_svContainer.delegate = self;
i have this code in my viewDidLoad function in my view controller. the scrollview gets set up properly and everything displays fine. I'm setting the delegate of the scrollview to the view controller. and get the following warning: "Class 'MyViewController' does not implement the 'UIScrollViewDelegate' protocol". However, i have a function to capture when the scrollview is scrolling which does get fired:
-( void ) scrollViewDidScroll:( UIScrollView * )scrollView
NSLog( @"SingleIssueViewController :: scrollViewDidScroll:" );
NSLog( @" offset:%@", scrollView );
NSLog( @" prop:%@", scrollView.frame );
the variable scrollView is good, but frame prints out "(null)". I've tried accessing other properties, like .contentOffset, to which the app crashes without any sort of error message in the console.
what could be causing this?
Message was edited by: mrkos66
Message was edited by: mrkos66

Answer 1

Declare in your header file that your VC adopts the UIScrollViewDelegate protocol and the warning will go away.
You cannot print out C structures as Objective-C objects using the %@ format specifier. You need to print the various primitive components of the CGRect using the appropriate specifier (generally %f, %g etc. can be used for float values).