//可以通过这种方法绘制复杂图形
UIImageView* lineImage = [[UIImageViewalloc]initWithFrame:CGRectMake(kScaleWidth(94),kScaleHeight(191),kScaleWidth(204),kScaleHeight(2))];
[self.viewaddSubview:lineImage];
UIGraphicsBeginImageContext(lineImage.frame.size);
[lineImage.imagedrawInRect:CGRectMake(0,0, lineImage.frame.size.width, lineImage.frame.size.height)];
CGContextSetLineCap(UIGraphicsGetCurrentContext(),kCGLineCapRound);
CGContextSetLineWidth(UIGraphicsGetCurrentContext(),10.0);
CGContextSetAllowsAntialiasing(UIGraphicsGetCurrentContext(),YES);
CGContextSetRGBStrokeColor(UIGraphicsGetCurrentContext(),1.0,1.0,1.0,1.0);
CGContextBeginPath(UIGraphicsGetCurrentContext());
CGContextMoveToPoint(UIGraphicsGetCurrentContext(),0,0);
CGContextAddLineToPoint(UIGraphicsGetCurrentContext(),kScaleWidth(204),kScaleHeight(0));
CGContextStrokePath(UIGraphicsGetCurrentContext());
lineImage.image=UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
