How do I determine what the valid range is for CGPoint on a device when using locationInView of touch events?

Question

I know the iPhone has 480 x 320 and iPad is 1024 x 768 but I don't know how to determine that programmatically. I'd appreciate any help I can get.

Answer 1

UITouch*yourTouchNameHere = [touches anyObject];
CGPoint yourPointNameHere=[touch locationInView:self.view];

This automatically means that the touch is on the screen, so any touch-point returned would be valid, but still the code below might help your understanding:

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Receive Screen size with: [UIScreen mainScreen].bounds.size

Height of iOSDevice in pixels returned with:

[UIScreen mainScreen].bounds.size.height

Width of iOSDevice in pixels returned with:

[UIScreen mainScreen].bounds.size.width

Is the iOSDevice an iPhone with:

if([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone){}

Is the iOSDevice an iPad with:

if([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPad){}

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Another stackOverflow question here shows you could also use

Return the entire screen resolution in points (320x400, etc.) with:

CGRect screenBounds = [[UIScreen mainScreen] bounds];

Return the screen resolution scale with:

CGFloat screenScale = [[UIScreen mainScreen] scale];

Another way to get the pixel width and height with the two above lines included:

CGSize screenSize = CGSizeMake(screenBounds.size.width * screenScale, screenBounds.size.height * screenScale);