CODEWITHSUNDEEP
iosuiviewuibutton
user1052122
user1052122

Reputation: 13

How to move button to random position?

I'm creating a very simple app for iPhone.

Just don't know how to make the button move to random position (but on the screen) when it's touched.

I'm using Xcode 4.2.

Upvotes: 0

Views: 7812

Answers (3)

maddiedog
maddiedog

Reputation: 365

% won't work on floats so it is better to change this to: 

- (IBAction)buttonPress:(UIButton *)sender {
    UIButton *button = (UIButton *)sender;

    int xmin = ([button frame].size.width)/2;
    int ymin = ([button frame].size.height)/2;

    int x = xmin + arc4random_uniform(self.view.frame.size.width - button.frame.size.width);
    int y = ymin + arc4random_uniform(self.view.frame.size.height - button.frame.size.height);


   [button setCenter:CGPointMake(x, y)];
}

Upvotes: 1

ColdLogic
ColdLogic

Reputation: 7275

Using arc4random() to generate a random number, you can generate an x and y coordinate to move the button to. You want to account for the width and height of the button so that it doesn't go partially off screen, and also for the screen width and height so it doesn't go fully offscreen.

-(void)buttonPressed:(id)sender {
    UIButton *button = (UIButton *)sender;

    int xmin = ([button frame].size.width)/2;
    int ymin = ([button frame].size.height)/2;

    int x = xmin + (arc4random() % (view.frame.size.width - button.frame.size.width));
    int y = ymin + (arc4random() % (view.frame.size.height - button.frame.size.height));

    [button setCenter:CGPointMake(x, y)];
}

Upvotes: 5

javieralog
javieralog

Reputation: 1337

To generate random numbers Generating random numbers in Objective-C

To move yor uibutton

button.center= CGPointMake(xCoord, yCoord);

Upvotes: 2

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