小さな iPhone アプリケーションを作成しました。UITableView を配置し、いくつかの UIView をセル内に配置しました。セル内のビューを水平に移動する機能を追加しました。UIViewで指を垂直に動かすと、UITableView全体を垂直に移動するロジックを追加したいと思います。それが私のコードです：
-(void)moveView:(UIPanGestureRecognizer *)recognizer
{
if([recognizer state] == UIGestureRecognizerStateBegan)
{
CGPoint location = [recognizer locationInView:[self superview]];
prevPos = location;
startPosition = self.frame.origin.x;
}
else if([recognizer state] == UIGestureRecognizerStateChanged)
{
CGPoint location = [recognizer locationInView:[self superview]];
float delX = location.x - prevPos.x;
float delY = location.y - prevPos.y;
if(delX > 0 && delX * delX > delY * delY)
{
CGPoint np = CGPointMake(self.frame.origin.x+delX, self.frame.origin.y);
CGRect fr = self.frame;
fr.origin = np;
self.frame = fr;
prevPos = location;
}
else if(delX * delX < delY * delY)
{
}
}
else if([recognizer state] == UIGestureRecognizerStateEnded ||
[recognizer state] == UIGestureRecognizerStateFailed ||
[recognizer state] == UIGestureRecognizerStateCancelled)
{
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.5];
CGRect rect = self.frame;
rect.origin.x = startPosition;
self.frame = rect;
startPosition = 0;
[UIView commitAnimations];
}
}
この状態でどのコードを入力すればよいですか: else if(delX * delX < delY * delY)?
ありがとう！