ios - touchesMoved:withEvent: 停止响应

Question

我已经应用了这个 stackoverflow 条目，以便在触摸从一个视图移动到另一个视图时检测到触摸。

子视图真正检测到触摸。但是，我正在做更多的事情。我需要将检测到触摸的视图从其父视图中删除，并将新视图添加到父视图。所以，我有这样的事情：

- (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];
        }
    }
}

通过 if 语句后，应用程序无法响应触摸移动。你认为是什么问题？是不是这个原因造成的：[view removeFromSuperview]？

Answer 1

尝试这个：

- (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];
        }
    }
}

我认为问题是您在迭代数组时正在更改数组。