- (UIImage *)drawLineWithFile:(NSString *)file {
UIImage *sourceImage = [UIImage imageWithContentsOfFile:file];
CGSize imageSize; //画的背景 大小
imageSize = [sourceImage size];
UIGraphicsBeginImageContextWithOptions(imageSize, NO, 0.0);
[sourceImage drawAtPoint:CGPointMake(0, 0)];
//获得 图形上下文
CGContextRef context=UIGraphicsGetCurrentContext();
CGContextDrawPath(context, kCGPathStroke);
CGFloat space = 6;
CGPoint aPoints[2];//坐标点
aPoints[0] =CGPointMake(space,space);//坐标1
aPoints[1] =CGPointMake(imageSize.width-space,imageSize.height-space);//坐标2
//CGContextAddLines(CGContextRef c, const CGPoint points[],size_t count)
//points[]坐标数组，和count大小
CGContextSetRGBStrokeColor(context, 1, 1, 1, 1);
CGContextSetLineWidth(context, 1.8);
CGContextAddLines(context, aPoints, 2);//添加线
CGContextDrawPath(context,kCGPathStroke);//根据坐标绘制路径
UIImage *newImage=UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newImage;
}
