本文介绍了当 UISlider 向左移动时获得负值的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我试图弄清楚如何在滑块返回时获得负值.
I was trying to figure out how to get a negative value of the slider when it goes back.
当我从左向右滑动时，它返回一个正值.我需要它在返回时返回一个负值(从右到左).
When I slide from left to right it returns a positive value. I need it to return a negative value when it goes back (from right to left).
换句话说，我如何检测到滑块正在返回?
In other words, how could I detect that the slider is going back?
self.borderSlider = [[UISlider alloc] initWithFrame:CGRectMake(0, 0, 200, 30)];
self.borderSlider.center = CGPointMake(self.view.centerX, SCREEN_WIDTH / 2);
self.borderSlider.minimumValue = 0.0f;
self.borderSlider.maximumValue = 100.0f;
self.borderSlider.tintColor = [UIColor grayColor];
[self.borderSlider addTarget:self action:@selector(borderSliderValueChanged:) forControlEvents:UIControlEventValueChanged];
推荐答案
我遇到了同样的问题，所以我开发了它，查看这个 repo:
I had the same problem so I've developed it, check this repo: Repo
slider?.amplitude = 50
slider?.sliderDidChange = { [weak slider] value in
if value > 10 {
slider?.activeColor = .blue
} else if value < 0 {
slider?.activeColor = .red
} else {
slider?.activeColor = .lightGray
}
}
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