CGPoint aPoints[3];//坐标点
aPoints[0] = CGPointMake(100, 80);//坐标1
aPoints[1] = CGPointMake(130, 80);//坐标2
aPoints[2] = CGPointMake(130, 100);//坐标3
//参数分别为：哪个画布，坐标数组， 个数。
CGContextAddLines(context, aPoints, 3);//添加线
CGContextDrawPath(context, kCGPathStroke); //根据坐标绘制路径
