Randomize picture

[dsinc14]

hello i am making an app that would involve randomizing a picture, but im not sure what to do.
I wanted it to be able to click anywhere on the screen for another random image.

If anyone knows the code plzzz leave a reply thank you.

[NewiPhoneDeveloper]

Originally Posted by dsinc14

hello i am making an app that would involve randomizing a picture, but im not sure what to do.
I wanted it to be able to click anywhere on the screen for another random image.

If anyone knows the code plzzz leave a reply thank you.

Well, let me try to put together a basic workflow for your problem:

1) Create an array and add names of your images to it.
2) Add a UIImageView element with the size of your screen to the view.
3) Implement a method to generate a random number, like:

- (int)getRandomNumber:(int)from to:(int)to {
	
	return (int)from + arc4random() % (to-from+1);
}

3) Implement the touches ended method, like:

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
	UITouch *touch = [[event allTouches] anyObject];
        //detect the touch
        if (CGRectContainsPoint([nameOfYourUIImageView frame], [touch locationInView:self.view])) {
              //set the new random image to your UIImageView
              nameOfYourUIImageView.image = [UIImage imageWithContentsOfFile:[[NSBundle mainBundle] pathForResource:[NSString stringWithFormat:@"%@",[nameOfYourArray objectAtIndex:[self getRandomNumber:0 to:[nameOfYourArray count]-1]]]  ofType:@"png"]];
             //right above we're calling the getRandomNumber method, we previously implemented. As expected it gets us a random number between 0 (arrays start at 0) and the maximum items in that array. We're also subtracting 1 from the array count (max items in the array), in order to prevent the app from crashing. To make that clear: arrays start from 0, but if you call [nameOfYourArray count] it gets you the number of items in your array and of course starts counting at 1.
}

I hope that gives you a basic idea and helps you to get started. Just browse this forum for more detailed examples on each of the tasks I described. Good luck!

[dsinc14]

Thank you for your help. It really helped.

[dsinc14]

What do i need to fill in with my data.



- (int)getRandomNumber:(int)from to:(int)to {

return (int)from + arc4random() % (to-from+1);
}

[NewiPhoneDeveloper]

Originally Posted by dsinc14

What do i need to fill in with my data.



- (int)getRandomNumberint)from toint)to {

return (int)from + arc4random() % (to-from+1);
}

I usually create a NSMutableArray in my .h file, like:

NSMutableArray *nameOfMyArray;

//below } of @interface in your .h file @property:

@property (nonatomic, retain) NSMutableArray *nameOfMyArray;

in your .m, first synthesize:

@synthesize nameOfMyArray;

//if you have a viewDidLoad method, allocate space for your array there and add the items:

nameOfMyArray = [[NSMutableArray alloc] initWithObjects:@"nameOfImage1Without_without.png", @"nameOfImage2Without.png", nil];

//don't forget to release your array inside the dealloc method:

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