UIImageView实现触摸绘图

核心代码，使用UIImageView实现触摸绘图， 比起使用数组实现要强很多， 使用数组会很费内存，高手请过。minixx新手学习资料保存 //监听触摸事件 -(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{ UITouch *touch = [touches anyObject]; currentPoint = [touch locationInView:self]; NSLog(@"currentPoint.x = %f",currentPoint.x); NSLog(@"currentPoint.y = %f",currentPoint.y); UIGraphicsBeginImageContext(self.frame.size); [drawImage.image drawInRect:CGRectMake(0, 0, drawImage.frame.size.width, drawImage.frame.size.height)]; CGContextSetLineCap(UIGraphicsGetCurrentContext(), kCGLineCapRound); CGContextSetLineWidth(UIGraphicsGetCurrentContext(), 5.0);//设置宽度 CGContextSetRGBStrokeColor(UIGraphicsGetCurrentContext(), 0.0, 0.0, 0.0, 1.0);//设置颜色 CGContextBeginPath(UIGraphicsGetCurrentContext());//开始路径 CGContextMoveToPoint(UIGraphicsGetCurrentContext(), lastPoint.x, lastPoint.y);//起始点坐标 CGContextAddLineToPoint(UIGraphicsGetCurrentContext(),currentPoint.x, currentPoint.y);//终点坐标 CGContextStrokePath(UIGraphicsGetCurrentContext());//开始绘制 //将画好得生成image保存在原图片／／／／／／／／／／ drawImage.image = UIGraphicsGetImageFromCurrentImageContext();//把图形上下文 UIGraphicsEndImageContext(); lastPoint = currentPoint; // [self setNeedsDisplay]; } -(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{ }