新建一個類繼承自UIScrollView 並重寫下面的方法
-(void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
[super touchesBegan:touches withEvent:event];
if ( !self.dragging )
{
[[self nextResponder] touchesBegan:touches withEvent:event];
}
}
-(void) touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{
[super touchesEnded:touches withEvent:event];
if ( !self.dragging )
{
[[self nextResponder] touchesEnded:touches withEvent:event];
}
}