Load image when screen tapped

Question

I'm attempting to make an app where you can tape to 'fire' and where you tap it will make an image appear aka a bullet hole. I realise I will have to make a UIImageView appear but I wouldn't have any idea how.

Any help is appreciated

Answer 1

-(void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event 
{
   UITouch *touch = [[event allTouches] anyObject];
   CGPoint location = [touch locationInView:touch.view];
   NSLog(@"X cord: %f",location.x);
   NSLog(@"Y cord: %f",location.y);
}

On above code you will get the current touch location.So place your image on that location. Hope it will help you.

Answer 2

Apply a UITapGestureRecognizer to your view controller's view, and set it to perform an action/method where you show the image.

Answer 3

Make sure your view userInteractionEnabled to YES

-(void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event 
{
   UITouch *touch = [[event allTouches] anyObject];
   CGPoint location = [touch locationInView:touch.view];
   [self addBulletHoleImageAtLocation:location];
}

-(void) addBulletHoleImageAtLocation:(CGPoint)location {
   UIImageView *imgView = [[UIImageView alloc] initWithFrame:CGRectMake(location.x, location.y, yourImageWidth, yourImageHeight)];
   imgView.image = [UIImage imageNamed:@"bulletHole.png"];
   imgView.contentMode = UIViewContentModeCenter;
   [self.view addSubview:imgView];
   [imgView release]; //if NON ARC
}

You can set different contentMode like, UIViewContentModeScaleToFill, UIViewContentModeScaleAspectFit, or UIViewContentModeScaleAspectFillas per your need.

Answer 4

//
//  ViewController.m
//

#import "ViewController.h"

@implementation ViewController

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    UITouch *touch = [[event allTouches] anyObject];
    CGPoint location = [touch locationInView: self.view];

    UIImage *bulletImg = [UIImage imageNamed: @"bullet.png"];
    UIImageView *bulletView = [[UIImageView alloc] initWithImage: bulletImg];

    int bulletWidth = bulletImg.size.width;
    int bulletHeight = bulletImg.size.height;

    bulletView.frame = CGRectMake(
                                  location.x - (bulletWidth / 2), // centered x position
                                  location.y - (bulletHeight / 2), // centered y position
                                  bulletWidth, // width
                                  bulletHeight // height
                                  );

    [self.view addSubview: bulletView];
}

@end