CODEWITHSUNDEEP
objective-cxcodecocoa-touchuser-interface
Aptlymade
Aptlymade

Reputation: 1

Xcode UITouch and UIImage user touches images placed where touched

Xcode Place an Image where the user touches

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

UIImage *image = [[UIImage alloc]initWithContentsOfFile:@"BluePin.png"];
[image drawAtPoint:point];
}

Basically touch screen image should appear where touched but nothing appears...

Upvotes: 0

Views: 3807

Answers (2)

Metabble
Metabble

Reputation: 11841

To add on to the other answer, here's how you could animate it:

- (void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
    NSLog(@"Touches began!");
    UITouch *touch= [[event allTouches] anyObject];
    CGPoint point= [touch locationInView:touch.view];

    UIImage *image = [UIImage imageNamed:@"BluePin.png"];

    UIImageView *imageView = [[UIImageView alloc] initWithImage:image];
    [imageView setFrame: CGRectMake(point.x-(imageView.bounds.size.width/2), point.y-(imageView.bounds.size.width/2), imageView.bounds.size.width, imageView.bounds.size.height)];
    [self addSubview: imageView];
    //self.currentPins += 1;

    [UIView animateWithDuration:2.0 delay:1.0 options:UIViewAnimationOptionCurveLinear  animations:^{
        [imageView setAlpha:0.0];
    } completion:^(BOOL finished) {
        [imageView removeFromSuperview];
        //self.currentPins -= 1;
    }];

   // for(;self.currentPins > 10; currentPins -= 1){
   //     [[[self subviews] objectAtIndex:0] removeFromSuperview];
   // }
}

The commented out code is a little extra I wrote to limit the amount of pins on the screen to ten at a time, assuming you have a @property called currentPins. Tested and it works, assuming I didn't mess anything up after copying, pasting and commenting out a few lines.

EDIT: Disregard the commented out code. I actually mixed up two versions (one without animation, one with) so it's broken.

Upvotes: 0

Mil0R3
Mil0R3

Reputation: 3956

  1. You should init a UIImage like this:

    UIImage *image = [UIImage imageNamed:@"BluePin"];

  2. You should use a UIImageView to contain a UIImage, you can not put a UIImage into UIView directly.

update

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

    UIImage *image = [UIImage imageNamed:@"BluePin"];
    CGRect rect=CGRectMake(point.x, point.y, image.size.width, image.size.height);
    UIImageView *imageView=[[UIImageView alloc]initWithFrame:rect];
    [imageView setImage:image];
    [self.view addSubview:imageView];
}

Upvotes: 1

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