ios 多点触遍历

最新推荐文章于 2021-01-14 22:55:58 发布

weixin_30797199

最新推荐文章于 2021-01-14 22:55:58 发布

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原文链接：http://www.cnblogs.com/zhjl/p/4232297.html

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];

1.循环创建imageView

 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 }

2.清除self.view

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 }