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iOS Build a Simple iPhone App (iOS7) Creating a Data Collection Randomization

Alex Suarez
Alex Suarez
868 Points
Posted by Alex Suarez
Alex Suarez
868 Points

HELP!! Using XCode 6.0.1 I get an alert, and my code won't randomize correctly!

Ok, here's part of my code (everything follows instructions as per the vids):

-(IBAction) buttonPressed {

int random = arc4random_uniform (self.predictions.count);

The alert message says:

Implicit conversion loses integer precision: 'NSUInteger' (aka 'unsigned long') to 'u_int32_t' (aka 'unsigned int)

When I run the simulator instead of getting a random number I always get 0 (zero). I've checked my code against the vids and everything coincides... And the code ran perfectly before the randomization.

Alex Suarez
Alex Suarez
868 Points
Alex Suarez
Alex Suarez
868 Points

Oh I also get an error message after the build: Thread 1: breakpoint 1.1 2.1

And The build works if I change the self.predictions.count to a number (7 in this case)

2 Answers

Chris Shaw
Chris Shaw
26,676 Points
Chris Shaw
Chris Shaw
26,676 Points

Hi Alex,

Have a read of the below thread here on Treehouse which has the answer and explanation to fix this warning.

https://teamtreehouse.com/forum/nsuinteger-conversion-loses-integer-warning-message-in-xcode

Alex Suarez
Alex Suarez
868 Points
Alex Suarez
Alex Suarez
868 Points

Thank you. I understood the concept and made the changes.