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案例：根据多点触控用图片来绘制路径 和 清除路径。
主要获取坐标 设置imageview的坐标。
视图默认不支持 多点触控：设置为支持多点触控：[self.view setMultipleTouchEnabled:YES];
4 - (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event 5 { 6 NSInteger i = 0; 7 for (UITouch *touch in touches) { 8 UIImageView *imageview = [[UIImageView alloc]initWithImage:self.imageData[i]]; 9 CGPoint location = [touch locationInView:self.view]; 10 [imageview setCenter:location]; 11 [self.view addSubview:imageview]; 12 i++; 13 } 14 }
isKindOfClass： 来判断是什么类型的控件。
1 [imageview setCenter:location]; 2 [self.view addSubview:imageview]; 3 i++; 4 } 5 } 6 7 - (void)clearView 8 { 9 for (UIImageView *imageView in self.view.subviews) { 10 11 if ([imageView isKindOfClass:[UIImageView class]]) { 12 [UIView animateWithDuration:5.0f animations:^{ 13 [imageView setAlpha:0.1f]; 14 } completion:^(BOOL finished) { 15 [imageView removeFromSuperview]; 16 }] ; 17 } 18 } 19 }
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原文地址：http://www.cnblogs.com/zhjl/p/4232297.html
