Size of default thumb image for iOS slider?

ios objective-c xcode cocoa-touch uislider
JohnK picture JohnK · May 4, 2013 · Viewed 18.3k times · Source

What is the exact size (width, height) of the (default) thumb image for the iOS slider? Is there perhaps some clever way to coax this out of the system (XCode, iOS)?

I tried

int thumbWidth = slider.currentThumbImage.size.width;

which I found here on this site, but it comes back with 0.

Additional question: The Xcode debugger shows this undocumented variable in the UISlider: CGFloat _hitOffset. Does anyone by chance know what it is and what it's for?

Answer

Rudolf Adamkovič picture Rudolf Adamkovič · May 19, 2014

What about this? Works for me:

CGRect trackRect = [self trackRectForBounds:self.bounds];
CGRect thumbRect = [self thumbRectForBounds:self.bounds trackRect:trackRect value:0];
CGSize thumbSize = thumbRect.size;

Related questions

Detecting touches on a UISlider?

I have a UISlider on screen, and I need to be able to detect when the user stops touching it. (so I can fade some elements away). I have tried using: - (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event but …

Read More
RootViewController Switch Transition Animation

Is there any way to have a Transition/animation effect while replacing an existing viewcontroller as rootviewcontroller with a new one in the appDelegate?

Read More
Xcode doesn't show the line that causes a crash

Every time my app crashes Xcode highlights the UIApicationMain() call in the main() function as the line that caused the crash. In some cases that used to be normal (segmentation fault for example) but the crash I am trying to …

Read More