可直接调用此方法，传入imageView和点数组。
func drawLineInImageWithImage(imageView:UIImageView,points:[CGPoint]){
UIGraphicsBeginImageContext(imageView.frame.size);
imageView.image?.drawInRect(CGRectMake(0, 0, imageView.frame.size.width, imageView.frame.size.height));
CGContextSetLineCap(UIGraphicsGetCurrentContext(), CGLineCap.Round);
CGContextSetLineWidth(UIGraphicsGetCurrentContext(), 5.0);
CGContextSetAllowsAntialiasing(UIGraphicsGetCurrentContext(), true);
CGContextSetRGBStrokeColor(UIGraphicsGetCurrentContext(), self.lineColor.r(),self.lineColor.g(),self.lineColor.b(),self.lineColor.a());
CGContextBeginPath(UIGraphicsGetCurrentContext());
let begin = points[0];
CGContextMoveToPoint(UIGraphicsGetCurrentContext(), begin.x,begin.y);//起点坐标
for point in points{
CGContextAddLineToPoint(UIGraphicsGetCurrentContext(), point.x, point.y);
}
//终点坐标
CGContextStrokePath(UIGraphicsGetCurrentContext());
imageView.image=UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
}
图片 1.png
