我在 IOS 中绘制应用程序时遇到了一些麻烦。我在一些教程的帮助下创建了自由手绘图。但是我发现在擦除这幅画时有些困难。在我的应用程序中,我有一个带有橡皮擦的按钮作为背景图像。单击橡皮擦按钮后,当我在绘图上滑动时,它会在我滑动的任何地方擦除绘图。谁能帮我做到这一点。提前致谢。
下面是我的代码:
@implementation LinearInterpView
{
UIBezierPath *path;
}
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
// Initialization code
}
return self;
}
-(id)initWithCoder:(NSCoder *)aDecoder {
if(self = [super initWithCoder:aDecoder]) {
[self setMultipleTouchEnabled:YES];
[self setBackgroundColor:[UIColor whiteColor]];
path=[UIBezierPath bezierPath];
[path setLineWidth:2.0];
}
return self;
}
-(void)drawRect:(CGRect)rect{
[[UIColor blackColor] setStroke];
[path stroke];
}
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
UITouch *touch=[touches anyObject];
CGPoint p=[touch locationInView:self];
[path moveToPoint:p];
}
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{
UITouch *touch=[touches anyObject];
CGPoint p=[touch locationInView:self];
[path addLineToPoint:p];
[self setNeedsDisplay];
}
-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
[self touchesMoved:touches withEvent:event];
}
-(void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event{
[self touchesEnded:touches withEvent:event];
}
// This is the button action to erase the drawing.
- (IBAction)erase:(id)sender {
CGContextRef cgref=UIGraphicsGetCurrentContext();
CGContextSetBlendMode(cgref, kCGBlendModeClear);
}
请清除我,我犯了什么错误。