找了很久网上文章都是各种复制，而且不管用，最后在stackOverFlow找到怎么解决，记录一下链接
关键是用UILongPressGestureRecognizer，实现拖动和点击
- (void)actionLongGesture:(UILongPressGestureRecognizer *)sender {
if (sender.state == UIGestureRecognizerStateBegan) {
CGPoint touchPoint = [sender locationInView:self.progressSlider];
CGFloat value = (self.progressSlider.maximumValue - self.progressSlider.minimumValue) * (touchPoint.x / self.progressSlider.frame.size.width );
NSInteger index = (NSInteger)(value + 0.5);
[self.progressSlider setValue:index animated:NO];
[self valueChange:self.progressSlider];
}else if (sender.state == UIGestureRecognizerStateChanged){
CGPoint touchPoint = [sender locationInView:self.progressSlider];
CGFloat value = (self.progressSlider.maximumValue - self.progressSlider.minimumValue) * (touchPoint.x / self.progressSlider.frame.size.width );
NSInteger index = (NSInteger)(value + 0.5);
[self.progressSlider setValue:index animated:NO];
[self valueChange:self.progressSlider];
}
}
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