Tutorial :Trying to reolve touch to location always returns zero (0) as x location



Question:

While writing the touchesBegan handler for my view I ran into this interesting error.

Code:

...  UITouch *touch = [touches anyObject];  CGPoint point = [touch locationInView:self];  ...  

The problem is point.x is always zero, no matter where I "touch" and y is a huge number that flunctuates somewhere between 1070000000 and 1090000000.

The handles is in a view class and it works the same is I pass nil instead of self to locationInView. I also tried looping over all of the touches, and there is only that one with x as zero always.

So what am I doing wrong here?


Solution:1

Any chance you're using NSLog(@"%d, %d", point.x, point.y); to print out the point values? It sounds kind of like a float -> int conversion error. I've used locationInView: a lot, and I've never had a problem like this.

You might also try checking [self frame] to make sure it's nonzero.


Solution:2

Ben is right. The problem is when you try to print the value using %d in NSLog, because point.x and point.y are float values.


Note:If u also have question or solution just comment us below or mail us on toontricks1994@gmail.com
Previous
Next Post »