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iOS

Posted by Suzanne Dawson
Suzanne Dawson
472 Points

Crystal Ball extra credit

I'm having a a great deal of trouble figuring out how to create the NSArray [UIColor] object to add random color to the prediction label text This is what I've done so far on the implementation view. I think I'm on the right path, but cannot figure out how to declare the [UIcolor] to the prediction label on the interface page self.predictions = [[NSArray alloc] initWithObjects: @"It is Certain", @"It is Decidedly So", @"All signs say YES", @"The Stars are not aligned", @"My reply is no", @"It is doubtful", @"Better not tell you now", @"Concentrate and ask again", @"Unable to answer now", @"Maybe, yes", nil];

self.predictions = [[NSArray alloc] initWithObjects: @"red", @"green", @"blue",nil]; }

(void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated. }

(IBAction)buttonPressed { int random = arc4random_uniform(self.predictions.count); self.predictionLabel.text = [self.predictions objectAtIndex:random]; self.predictionLabel.color = [self.predictions objectAtIndex:random];

5 Answers

Suzanne Dawson
Suzanne Dawson
472 Points
Suzanne Dawson
Suzanne Dawson
472 Points

I do not have the answer

Rajat Bhargava
Rajat Bhargava
3,318 Points
Rajat Bhargava
Rajat Bhargava
3,318 Points

You are using the same variable name for the predictions and color array. You will have to define another variable name ex. self.colors = [[NSArray alloc] initWithObjects: @"red", @"green", @"blue",nil];

Suzanne Dawson
Suzanne Dawson
472 Points
Suzanne Dawson
Suzanne Dawson
472 Points

Thanks Rajat, still getting an error though. This is what I have on the interface page

@interface SDViewController : UIViewController @property (strong, nonatomic) IBOutlet UILabel *predictionLabel; @property (strong, nonatomic) NSArray *predictions; @property (strong, nonatomic) 'UIColor' UILabel *colors;

Rajat Bhargava
Rajat Bhargava
3,318 Points
Rajat Bhargava
Rajat Bhargava
3,318 Points

In the interface add this. @property (strong, nonatomic) NSArray *colorsArray;

And in the implementation now initialize this object self.colorsArray = [[NSArray alloc] initWithObjects: @"red", @"green", @"blue",nil];

Suzanne Dawson
Suzanne Dawson
472 Points
Suzanne Dawson
Suzanne Dawson
472 Points

Well, i'm still getting all screwed up. Implementation:

[super viewDidLoad];

self.predictions = [[NSArray alloc] initWithObjects:
                   @"It is Certain",
                   @"It is Decidedly So",
                   @"All signs say YES",
                   @"The Stars are not aligned",
                   @"My reply is no",
                   @"It is doubtful",
                   @"Better not tell you now",
                   @"Concentrate and ask again",
                   @"Unable to answer now",
                   @"Maybe, yes", nil];

self.colorsArray = [[NSArray alloc] initWithObjects:
                   @"red",
                   @"green",
                   @"blue",nil];

}

  • (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated. }

  • (IBAction)buttonPressed { int random = arc4random_uniform(self.predictions.count); self.predictionLabel.text = [self.predictions objectAtIndex:random]; self.predictionLabel.color = [self.predictions objectAtIndex:random];

Interface:

import <UIKit/UIKit.h>

@interface SDViewController : UIViewController @property (strong, nonatomic) IBOutlet UILabel *predictionLabel; @property (strong, nonatomic) NSArray *predictions; @property (strong, nonatomic) NSArray *colorsArray;

  • (IBAction)buttonPressed;

@end