CODEWITHSUNDEEP
iosobjective-cbuttonuser-interface
DarkAssassin
DarkAssassin

Reputation: 35

How do i make my picture relocate it self on the screen with a button

Im learning Xcode and i was wondering how to make a button refresh part of my code or something. Im placing a picture in a random location on my screen but i want to be able to press the button to relocate it to another random location, any input would be greatly appreciated. Thanks. This is my code. ViewController.m

- (void)viewDidLoad
{
int xValue = arc4random() % 320;
int yValue = arc4random() % 480;


UIImageView *imgView = [[UIImageView alloc] initWithFrame:CGRectMake(xValue, yValue, 70, 30)];
NSString *imgFilepath = [[NSBundle mainBundle] pathForResource:@"clubs-2-150" ofType:@"jpg"];
UIImage *img = [[UIImage alloc] initWithContentsOfFile:imgFilepath];
[imgView setImage:img];
[self.view addSubview:imgView];


[super viewDidLoad];   
}

Upvotes: 2

Views: 49

Answers (1)

Ares
Ares

Reputation: 5903

As your code stands right now it is not possible Variables have a scope, that means, they only exists within certain functions or classes. You variable imgView only exists on viewDidLoad. For you to be able to access it somewhere else you need to declare it as an instance variable.

on your .h file to this:

@interface yourClassName : UIViewController {
   UIImage *imageIWantToChange;
}

This will let you access imageIWantToChange in all of your yourClassName functions.

Now, on your .m 

- (void)viewDidLoad
{

   [super viewDidLoad];   

   int xValue = arc4random() % 320;
   int yValue = arc4random() % 480;

   //Notice that we do not have UIImage before imageIWantToChange
   imageIWantToChange = [[UIImageView alloc] initWithFrame:CGRectMake(xValue, yValue, 70, 30)];
   UIImage *img = [UIImage imageNamed:@"clubs-2-150.jpg"];
   [imageIWantToChange setImage:img];
   [self.view addSubview:imgView];

}

Then in your IBAction or button selector:

-(IBAction) buttonWasPressed:(id) sender {
   CGRect frame = imageIWantToChange.frame;

   frame.origin.x = arc4random() % 320;
   frame.origin.y = arc4random() % 480;

   imageIWantToChange.frame = frame;
}

Upvotes: 2

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