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Adam Berkowitz
2,673 PointsUIColor arrays
I don't quite understand how to create a UIColor array. So far, I've added @property (strong, nonatomic) NSArray *colorArray; to my ViewController.h file and synthesized it in the implementation file.
Then in the viewDidLoad method I wrote self.colorArray = [[NSArray alloc] initWithObjects:[UIColor redColor],[UIColor blueColor],[UIColor greenColor], nil];
Now I'm stuck though I'm trying to use something similar to the text randomization feature from the crystal ball app, but it's not working. So what I've got is
NSUInteger color = arc4random_uniform(self.colorArray.count);
self.colorArray.????? = [self.colorArray objectAtIndex:color];
but I don't know what comes just to the right of self.colorArray. Thanks for any help!
3 Answers
Caleb Abraham
15,158 PointsI'm not sure what your goal is here. The code above makes an array of UIColors (colorArray) and a random number (color). So your [self.colorArray objectAtIndex:color] successfully returns a random color. But what I don't understand is what you're trying to do on the left side of the equals. I don't think you want to do anything to colorArray. You can apply your returned color to a view. You can output your returned color as a log. But you don't want to declare anything in colorArray anymore.
You could set your random color to a specific index of your array if that's what you're going for. self.colorArray[0] = [self.colorArray objectAtIndex:color]
Amit Bijlani
Treehouse Guest TeacherThe right side is fine. What you want to do is access a random object from the array and assign it something. In your example you are accessing an object and assigning it back to the array. That's not what you want to do. You can assign to the text color of the label like this:
NSUInteger color = arc4random_uniform(self.colorArray.count);
self.predictionLabel.textColor = [self.colorArray objectAtIndex:color];
Adam Berkowitz
2,673 PointsOk. Thanks to both of you! I fixed the problem.