iOS滑块的默认缩略图的大小？ [英] Size of default thumb image for iOS slider?

问题描述

iOS滑块（默认）拇指图像的确切大小（宽度，高度）是多少？

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)?

我尝试过

int thumbWidth = slider.currentThumbImage.size.width;

我发现在此网站上获取缩略图的中心，但返回值为0。

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

其他问题：Xcode调试器在 UISlider 中显示此未记录的变量： CGFloat _hitOffset 。有人偶然知道它的含义和用途吗？

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?

推荐答案

这怎么办？为我工作：

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

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