ios – UISlider步骤不均匀.

如果这是我的问题,我会构建一个这样结构的自定义视图

DKCustomSliderView
 -> UIImageView (subview for slider head)

它实现了这样的接口.

@interface DKCustomSliderView : UIView

-(void)setStopPoints:(NSArray *)stopPoints; //array of NSnumbers between 0-1 which define indents
-(void)setSliderHeadImage:(UIImage *)sliderHeadImage; //image to use as slider head
-(void)seTindentImage:(UIImage *)indentImage; //image to use as indent marker
-(void)setTrackImage:(UIImage *)trackImage; //stretchy image to use on track 

@end

我会在滑块图像视图上跟踪平移手势.

-(void)handlePanGesture:(UIPanGestureRecogniser *)pgr {

if(pgr.state == UIGestureRecogniserStateChanged) { 

   //am i near an indent?,if so lock me here and be slightly sticky.

}
}

DKCustomSliderView的绘制矩形看起来有点像这样.

-(void)drawRect:(CGRect)dirtyRect {

CGRect bounds = self.bounds;

// 1. draw track across width

for(NSnumber *marker in self.stopPoints) {

//draw a instance of self.indentImage at ([marker floatValue]/bounds.size.width)

}

}