Getting x/y coordinate of a UITouch...

Posted by Tarek on Stack Overflow See other posts from Stack Overflow or by Tarek
Published on 2010-06-08T20:29:37Z Indexed on 2010/06/08 20:32 UTC
Read the original article Hit count: 301

Filed under:

iphone-sdk

|

uiview

|

resolution

|

uitouch

|

uiwindow

HI,

I have been trying to get the x/y coordinates from a touch on any iDevice.

When getting the touch locations, everything looks ok if the touch is in the middle of the screen. But if I drag my finger to the bottom of the screen, I can only get a y coordinate of 1015. It should be getting to 1023. Same thing for dragging my finger to the top of the screen. I get -6. It should be 0. I have explicitly set the window and views to an origin of 0,0 and the width, height of the device's screen. Still nothing.

I am really lost on what might be going on. Is something shifted? Am I not reading the x/y coordinates properly. Does something need to be transformed or converted?

Any help would be much appreciated.

T

© Stack Overflow or respective owner

Related posts about iphone-sdk

iPhone SDK 3.2 beta and iPhone SDK 3.1.2

as seen on Stack Overflow - Search for 'Stack Overflow'
Hello, Currently I am using iPhone SDK 3.1.2 for developing iPhone apps. Apple has recently released iPhone SDK 3.2 beta and I want to try my hands with it. But my problem is that I want to use both versions of SDKs, 3.1.2 since I am currently developing apps and uploading on app store, 3.2 beta… >>> More
iPhone SDK: subFolders inside the main bundle

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, in the current project I have a number of folders, with subfolders, and these contain images: 01.png, 02.png. Folder1/FolderA/f1.png Folder1/FolderB/F1.png When I compile the app, I looked inside the the .app and noticed that all the images are placed in the top level, with no sub-folders.… >>> More
accessing video preview data with iPhone SDK 3.1.2/3

as seen on Stack Overflow - Search for 'Stack Overflow'
Is there a way to access raw data of iphone camera preview? I mean not the data of the picture that was shot already, but the preview, that shows before taking a shot? TIA >>> More
iPhone SDK: subFolders inside the main bundle

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, in the current project I have a number of folders, with subfolders, and these contain images: 01.png, 02.png. Folder1/FolderA/f1.png Folder1/FolderB/F1.png When I compile the app, I looked inside the the .app and noticed that all the images are placed in the top level, with no sub-folders.… >>> More
Accessing Instance Attributes from Secondary Thread (iPhone-SDK)

as seen on Stack Overflow - Search for 'Stack Overflow'
I have a class with an NSDictionary attribute. Inside this class I dispatch another thread to handle NSXMLParser handling. Inside my -didStartElement, I access the dictionary in the class (to compare an element found in the XML to one in the dictionary). At this point I get undefined results. Using… >>> More

Related posts about uiview

UIView inside UIView with Shadow?

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, I've been trying to figure out how to draw a shadow for an UIView that was added inside a UIView with addSubview. I searched online and read the docs, but the Apple docs simply draw new shapes as shown below. I want to use the Core Graphics to add a shadow to the UIView, but am unsure how to… >>> More
uiview to Uiview switch

as seen on Stack Overflow - Search for 'Stack Overflow'
I have a uiview class and i want to switch to other uiview class but without using addsubview is there any other way to do that except the one (addSubView) >>> More
Reload UIVIew on UIVIew from Xib

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, I have a UIViewController that I launch from a Xib file who's contain a UIView (0,0,320,480) and this UIView contain another UIView (0,0,320,250). Inside my ViewController, I need to reload the second UIView bu clicking on a button, how to do that? Thanks, >>> More
Copying the bitmap contents of a UIView's context to that of another UIView

as seen on Stack Overflow - Search for 'Stack Overflow'
Basically what I want to do is copy the already rendered content (a PDF drawn into the UIView's graphics context using CGContextDrawPDFPage()) onto a similar UIView, without having to re render the PDF. The idea is, that I'd then be able to perform an animated transform on the UIView and later re… >>> More
Allowing interaction with a UIView under another UIView

as seen on Stack Overflow - Search for 'Stack Overflow'
Is there a simple way of allowing interaction with a button in a UIView that lies under another UIView - where there are no actual objects from the top UIView on top of the button? For instance, at the moment I have a UIView (A) with an object at the top and an object at the bottom of the screen… >>> More