您正在另一个滑块上方添加一个滑块。所以根据Cocoa-Touch标准，只有Top（新添加的）滑块将检测所有事件。当您在相同的帧值上添加两个滑块时，第一个滑块将是不可触摸的。

You are adding one slider above another slider.So As per Cocoa-Touch standards, Only Top (newly added) slider will detect all events. First slider will be untouchable as you added both slider on same frame value.

有许多适用于iOS的Range Slider示例。以下几个可以帮助您的例子

There are so many Range Slider examples available for iOS. Below are few examples which may help you

• MARKRangeSlider


• NMRangeSlider


• ACVRangeSelector


• BJRangeSliderWithProgress


• iosrangeslider


• ASRangeSlider


• TTRangeSlider

• MARKRangeSlider
• NMRangeSlider
• ACVRangeSelector
• BJRangeSliderWithProgress
• iosrangeslider
• ASRangeSlider
• TTRangeSlider