Random number to pick an image

@@rz · 02-12-2010, 11:56 AM

I've been searching all over the net for an answer to this one! Hoping one of you can help me.

So far I have a button that produces a random nr between 1 and 6 in a label.

>>Then I want a picture to appear depending on what nr is in the label.

For example: If the number 1 is generated, I want img1.png to appear in a UIImageView.(?)
I'm thinking maybe a if function to pick the picture?

Here is the .h file:
#import <UIKit/UIKit.h>

@interface xxxViewController : UIViewController {
IBOutlet UILabel *label;
int randomNumber;
}
-(IBAction)randomize;

@end

...and here is the .m file:

#import "xxxViewController.h"
@implementation xxxViewController

-(IBAction)randomize {
int randomNumber = 1+ arc4random() %(6);
label .text = [NSString stringWithFormat:@"%d",randomNumber];

}

// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {
[super viewDidLoad];

int randomNumber = 1+ arc4random() %(6);
label .text = [NSString stringWithFormat:@"%d",randomNumber];

}

- (void)didReceiveMemoryWarning {
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];

// Release any cached data, images, etc that aren't in use.
}

- (void)viewDidUnload {
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}

- (void)dealloc {
[super dealloc];
}

@end

ZunePod · 02-12-2010, 12:12 PM

Quote:

Originally Posted by @@rz

I've been searching all over the net for an answer to this one! Hoping one of you can help me.

So far I have a button that produces a random nr between 1 and 6 in a label.

>>Then I want a picture to appear depending on what nr is in the label.

For example: If the number 1 is generated, I want img1.png to appear in a UIImageView.(?)
I'm thinking maybe a if function to pick the picture?

Here is the .h file:

Code:

#import <UIKit/UIKit.h>

@interface xxxViewController : UIViewController {
	IBOutlet  UILabel *label;
	int randomNumber;
}
-(IBAction)randomize;

@end

...and here is the .m file:

Code:

#import "xxxViewController.h"
@implementation xxxViewController

-(IBAction)randomize {
	int randomNumber = 1+ arc4random() %(6);
	label .text =	[NSString stringWithFormat:@"%d",randomNumber];
	
}


// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {
    [super viewDidLoad];
	
	int randomNumber = 1+ arc4random() %(6);
	label .text =	[NSString stringWithFormat:@"%d",randomNumber];
	
if(randomNumber == 1){
// Display Image
}
if(randomNumber == 2){
// Display Image
}
if(randomNumber == 3){
// Display Image
}
if(randomNumber == 4){
// Display Image
}
if(randomNumber == 5){
// Display Image
}
if(randomNumber == 6){
// Display Image
}

}

- (void)didReceiveMemoryWarning {
	// Releases the view if it doesn't have a superview.
    [super didReceiveMemoryWarning];
	
	// Release any cached data, images, etc that aren't in use.
}

- (void)viewDidUnload {
	// Release any retained subviews of the main view.
	// e.g. self.myOutlet = nil;
}


- (void)dealloc {
    [super dealloc];
}

@end

New code is in bold, it might not be right but it should give you an idea, the proper way would be to use elseif's I think.

@@rz · 02-12-2010, 12:33 PM

What would be the path to the image?

rarindeed · 02-12-2010, 01:05 PM

why not use stringWithFormat to gen the image filename?

@@rz · 02-12-2010, 02:36 PM

A guy told me to use this code to create the image filename: [NSString stringWithFormat:@"image%d.png", number];

How do I implement it in the .h and .m ?

Duncan C · 03-14-2010, 03:24 PM

Quote:

Originally Posted by @@rz

A guy told me to use this code to create the image filename: [NSString stringWithFormat:@"image%d.png", number];

How do I implement it in the .h and .m ?

Like this:

Code:

UIImage* imageForNumber: (NSInteger) image_number
{
   NSString filename = [NSString stringWithFormat: @image%d.png", image_number];
   UIImage* theImage = [UIImage imageNamed: filename];
   return theImage;
}

The imageNamed method will look for the image in your app's main bundle (images built into your program.)

The code above will return nil if there is no image with the specified filename.

Regards,

Duncan C