限制触摸移动的物体与墙壁碰撞？
我正在尝试创建一个非常简单的游戏，您可以在其中拖动简单的 imageView。问题是框架中有一堵墙（只是一个矩形），图像不应该放在上面。所以我做了这样的事情：
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [[event allTouches] anyObject];
if ([touch view] == myImage) {
if (CGRectContainsRect (CGRectMake(0, 0, 800, 768), [myImage frame]))
{
myImage.center = [touch locationInView:self.view];
}
}
}
但问题是图像确实超出了它的范围，然后卡在那里，触摸移动结束了。
所以我添加了这个：
else if (CGRectIntersectsRect (CGRectMake(801, 0, 223, 768), [myImage frame])) {
CGPoint touchedPoint = [touch locationInView:self.view];
myImage.center = CGPointMake(730, touchedPoint.y);
}
但这使得图像在与“墙”相交时开始闪烁，并最终卡在那里。
我觉得必须有一个简单的方法来做到这一点。有人可以启发我吗？
I'm trying to create a very simple game where you can drag a simple imageView. The thing is there is a wall in the frame (just a rectangle) on which the image should not go. so I did something like this:
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [[event allTouches] anyObject];
if ([touch view] == myImage) {
if (CGRectContainsRect (CGRectMake(0, 0, 800, 768), [myImage frame]))
{
myImage.center = [touch locationInView:self.view];
}
}
}
But the problem was that the image did went out of it's bounds and then got stuck there and the touchesmoved ended.
so I've added this:
else if (CGRectIntersectsRect (CGRectMake(801, 0, 223, 768), [myImage frame])) {
CGPoint touchedPoint = [touch locationInView:self.view];
myImage.center = CGPointMake(730, touchedPoint.y);
}
But this made the image to start flickering when intersecting with the "wall" and eventually got stuck there either.
I feel there must be a simple way to do that. could anyone enlighten me please?
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评论（1）
好吧，发现我的错误..
我必须这样做：
而不是这样：
是的，很傻..
ok found my mistake..
I had to do this:
instead of this:
ye, quite silly..