xcode 触摸并在屏幕周围拖动图像
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Touch and drag an image around the screen
提问by user964627
I have three images that I want the user to move around the screen. For example you have a football, baseball, and a basketball. I would like the user to select one of the images and then move that image around on the screen without affecting the other two. I watched some tutorials on make a image move around on the screen but what I am having a hard time moving around several images.
我有三个图像，我希望用户在屏幕上移动。例如，您有橄榄球、棒球和篮球。我希望用户选择其中一个图像，然后在屏幕上移动该图像而不影响其他两个。我看了一些关于在屏幕上移动图像的教程，但是我很难在几个图像上移动。
What is the best way to enable three images on the screen to have separate touch controls (Drag Around).
使屏幕上的三个图像具有单独的触摸控件（拖动）的最佳方法是什么。
回答by Alex Nichol
Simply create a UIImageView subclass, for this example I'll call it DragView, and use this class for each of the image views:
只需创建一个 UIImageView 子类，在本例中我将其称为 DragView，并为每个图像视图使用此类：
DragView.h
拖动视图.h
@interface DragView : UIImageView {
}
@end
DragView.m
拖动视图.m
- (void)touchesMoved:(NSSet *)set withEvent:(UIEvent *)event {
CGPoint p = [[set anyObject] locationInView:self.superview];
self.center = p;
}
Now, the user will be able to drag any individual instance of DragView around in its superview. If you are creating your image views manually (e.g. imageView = [[UIImageView alloc] initWithImage:anImage]), replace UIImageViewwith DragView. You will also need to import DragView.h in your view controller's header.
现在，用户将能够在其超级视图中拖动任何单独的 DragView 实例。如果您手动创建图像视图（例如 imageView = [[UIImageView alloc] initWithImage:anImage]），请替换UIImageView为DragView. 您还需要在视图控制器的标题中导入 DragView.h。
If you are initializing your image views through interface builder, you can use the attributes inspector to change the class of the image view from UIImageViewto DragView.
如果您通过界面构建器初始化图像视图，则可以使用属性检查器将图像视图的类从UIImageView更改为DragView。
