touchesMoved:withEvent:停止响应

Question

我已经应用了this stackoverflow entry，所以当它从一个视图移动到另一个视图时，我可以检测到触摸。

子视图真的能检测到触摸。然而，我正在做更多的事情。我需要检测到触摸的视图从其父视图中移除，并将新视图添加到父视图中。所以，我有这样的东西：

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event 
{
    UITouch *touch = [[event allTouches] anyObject];
    CGPoint touchLocation = [touch locationInView:self.contentView];

    for (UIView *view in self.contentView.subviews)
    {
        if ([view isKindOfClass:[MyCustomView class]] &&
            CGRectContainsPoint(view.frame, touchLocation))
        {
            [view removeFromSuperview];
            UIView *aNewView = [[[UIView alloc] initWithFrame:someFrame] autorelease];
            [self.contentView addSubview:aNewView];
        }
    }
}

在传递if-语句后，应用程序无法响应触摸移动。你认为问题出在哪里？是由这个引起的吗：[view removeFromSuperview]

Answer 1

试试这个：

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event 
{
    UITouch *touch = [[event allTouches] anyObject];
    CGPoint touchLocation = [touch locationInView:self.contentView];

    NSArray *subviews = [self.contentView.subviews copy];
    for (UIView *view in subviews)
    {
        if ([view isKindOfClass:[MyCustomView class]] &&
            CGRectContainsPoint(view.frame, touchLocation))
        {
            [view removeFromSuperview];
            UIView *aNewView = [[[UIView alloc] initWithFrame:someFrame] autorelease];
            [self.contentView addSubview:aNewView];
        }
    }
}

我认为问题在于你在迭代的时候改变了数组。