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* 重写drawRect方法准备：

//继承UIView的子类.h文件

#import<UIKit/UIKit.h>
@interfaceDashesLineView :UIView
@property(nonatomic)CGPointstartPoint;//虚线起点
@property(nonatomic)CGPointendPoint;//虚线终点
@property(nonatomic,strong)UIColor* lineColor;//虚线颜色
@end```

######//.m文件

import"DashesLineView.h"

@implementationDashesLineView

• (id)initWithFrame:(CGRect)frame
  {
  self= [superinitWithFrame:frame];
  if(self)
  {
  // Initialization code}returnself;
  }// Only override drawRect: if you perform custom drawing.
  // An empty implementation adversely affects performance during animation.

• (void)drawRect:(CGRect)rect
  {
  CGContextRefcontext = UIGraphicsGetCurrentContext();
  CGContextBeginPath(context);
  CGContextSetLineWidth(context,0.5);//线宽度

  CGContextSetStrokeColorWithColor(context,self.lineColor.CGColor);
  CGFloatlengths[] = {4,2};//先画4个点再画2个点

CGContextSetLineDash(context,0, lengths,2);//注意2(count)的值等于lengths数组的长度CGContextMoveToPoint(context,self.startPoint.x,self.startPoint.y);

CGContextAddLineToPoint(context,self.endPoint.x,self.endPoint.y);

CGContextStrokePath(context);CGContextClosePath(context);

}
@end```