设置刮开后,显示的文字Label
UILabel *label = [[UILabel alloc]initWithFrame:CGRectMake(7,50,400,400)]; label.text = @"离思五首\n元稹\n曾经沧海难为水,\n除却巫山不是云!\n取次花丛懒回顾,\n半缘修道半缘君!\n";
label.numberOfLines =0;
label.backgroundColor = [UIColor colorWithRed:(arc4random()%173)/346.0+0.5green:(arc4random()%173)/346.0+0.5blue:(arc4random()%173)/346.0+0.5alpha:1];
label.font = [UIFont systemFontOfSize:30];
label.textAlignment = NSTextAlignmentCenter; [self.view addSubview:label];
设置遮挡在外面的Image
self.imageView= [[UIImageViewalloc]initWithFrame:CGRectMake(7,50,400,400)];self.imageView.image= [UIImageimageNamed:@"可达鸭"];
[self.viewaddSubview:self.imageView];
在touchesMoved方法里面实现操作
`- (void)touchesMoved:(NSSet
*)touches withEvent:(UIEvent*)event{
// 触摸任意位置
UITouch*touch = touches.anyObject;
// 触摸位置在图片上的坐标CGPointcententPoint = [touch locationInView:self.imageView];
// 设置清除点的大小CGRectrect =CGRectMake(cententPoint.x, cententPoint.y,20,20);
// 默认是去创建一个透明的视图 UIGraphicsBeginImageContextWithOptions(self.imageView.bounds.size, NO, 0);
// 获取上下文(画板)CGContextRefref =UIGraphicsGetCurrentContext();
// 把imageView的layer映射到上下文中[self.imageView.layerrenderInContext:ref];
// 清除划过的区域CGContextClearRect(ref, rect);
// 获取图片UIImage*image =UIGraphicsGetImageFromCurrentImageContext();// 结束图片的画板, (意味着图片在上下文中消失)UIGraphicsEndImageContext();self.imageView.image= image;
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