ios 多点触遍历

浏览数：28 / 时间：2015年06月11日

案例：根据多点触控用图片来绘制路径和清除路径。

技术分享

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 }