Iphone 画画后添加橡皮擦工具

我有绘画应用程序。当我点击按钮时，它会启动“绘制视图”，用户无法绘制。返回后，单击按钮，paintview将不会重置。如何在绘制后重置按钮单击中的视图

代码：

在viewcontroller代码中：

 PaintView *paint = [[PaintView alloc] initWithFrame:self.view.bounds];
    [self.view addSubview:paint];
    [paint release];

在…中，，， 为橡皮擦做一个切换，并按如下方式更改代码

if(togleEraser == NO)
{
    CGContextSetLineWidth(UIGraphicsGetCurrentContext(), 2.0);

    CGContextSetRGBStrokeColor(UIGraphicsGetCurrentContext(), 0.0, 0.0, 0.0, 1.0);

    CGContextBeginPath(UIGraphicsGetCurrentContext());

    CGContextMoveToPoint(UIGraphicsGetCurrentContext(), lastPoint.x, lastPoint.y);

    CGContextAddLineToPoint(UIGraphicsGetCurrentContext(), currentPoint.x,         currentPoint.y);
}
else
{
    CGContextSetLineWidth(UIGraphicsGetCurrentContext(), 20);

    CGContextSetRGBStrokeColor(UIGraphicsGetCurrentContext(), 1, 0, 0, 10);

    CGContextBeginPath(UIGraphicsGetCurrentContext());

    CGContextMoveToPoint(UIGraphicsGetCurrentContext(), lastPoint.x, lastPoint.y);

    CGContextClearRect (UIGraphicsGetCurrentContext(), CGRectMake(lastPoint.x, lastPoint.y, 50, 50));
}

---

最简单的方法就是删除视图并重新创建它。添加一些代码到您的问题，您的问题不清楚。。。重置视图取决于您编写了什么代码让用户在该视图上绘制

if(togleEraser == NO)
{
    CGContextSetLineWidth(UIGraphicsGetCurrentContext(), 2.0);

    CGContextSetRGBStrokeColor(UIGraphicsGetCurrentContext(), 0.0, 0.0, 0.0, 1.0);

    CGContextBeginPath(UIGraphicsGetCurrentContext());

    CGContextMoveToPoint(UIGraphicsGetCurrentContext(), lastPoint.x, lastPoint.y);

    CGContextAddLineToPoint(UIGraphicsGetCurrentContext(), currentPoint.x,         currentPoint.y);
}
else
{
    CGContextSetLineWidth(UIGraphicsGetCurrentContext(), 20);

    CGContextSetRGBStrokeColor(UIGraphicsGetCurrentContext(), 1, 0, 0, 10);

    CGContextBeginPath(UIGraphicsGetCurrentContext());

    CGContextMoveToPoint(UIGraphicsGetCurrentContext(), lastPoint.x, lastPoint.y);

    CGContextClearRect (UIGraphicsGetCurrentContext(), CGRectMake(lastPoint.x, lastPoint.y, 50, 50));
}