UIButton 在 iOS 7 上的突出显示状态延迟



我在Xcode - Single View应用程序中创建了新项目。应用程序只有两个按钮。

UIButton *button1 = [UIButton buttonWithType:UIButtonTypeCustom];
[button1 setBackgroundColor:[UIColor greenColor]];
[button1 setFrame:CGRectMake(0, self.view.frame.size.height-40-100, self.view.frame.size.width, 40)];
[button1 setTitle:NSLocalizedString(@"button 1", nil) forState:UIControlStateNormal];
[button1 setTitleColor:[UIColor redColor] forState:UIControlStateNormal];
[button1 setTitleColor:[UIColor blueColor] forState:UIControlStateHighlighted];
[self.view addSubview:button1];
UIButton *button2 = [UIButton buttonWithType:UIButtonTypeCustom];
[button2 setBackgroundColor:[UIColor greenColor]];
[button2 setFrame:CGRectMake(0, self.view.frame.size.height-40, self.view.frame.size.width, 40)];
[button2 setTitle:NSLocalizedString(@"button 2", nil) forState:UIControlStateNormal];
[button2 setTitleColor:[UIColor redColor] forState:UIControlStateNormal];
[button2 setTitleColor:[UIColor blueColor] forState:UIControlStateHighlighted];
[self.view addSubview:button2];

当我使用 iOS 7 第二个按钮在 iPhone 上运行此应用程序时,当我按下此按钮时,突出显示状态有延迟。在装有iOS 6的iPhone上,第二个按钮工作完美。

为什么iOS 7上的按钮有延迟突出显示?

我的问题是我有一个UIButton作为分页UIScrollView的子视图,所以我希望用户能够在按钮所在的区域进行右滑动,而无需按下按钮。在 iOS6 中,如果您在圆形矩形按钮上执行此操作,它可以正常工作,但在 iOS7 中它也可以工作,但按钮不会触发其突出显示。因此,为了解决这个问题,我使用以下longPressGestureRecognizer实现了自己的UIButton

- (void) longPress:(UILongPressGestureRecognizer *)longPressGestureRecognizer
{
    if (longPressGestureRecognizer.state == UIGestureRecognizerStateBegan || longPressGestureRecognizer.state == UIGestureRecognizerStateChanged)
    {
        CGPoint touchedPoint = [longPressGestureRecognizer locationInView: self];
        if (CGRectContainsPoint(self.bounds, touchedPoint))
        {
            [self addHighlights];
        }
        else
        {
            [self removeHighlights];
        }
    }
    else if (longPressGestureRecognizer.state == UIGestureRecognizerStateEnded)
    {
        if (self.highlightView.superview)
        {
            [self removeHighlights];
        }
        CGPoint touchedPoint = [longPressGestureRecognizer locationInView: self];
        if (CGRectContainsPoint(self.bounds, touchedPoint))
        {
            if ([self.delegate respondsToSelector:@selector(buttonViewDidTouchUpInside:)])
            {
                [self.delegate buttonViewDidTouchUpInside:self];
            }
        }
    }
}

然后,当您初始化longPressGestureRecognizer并执行以下操作时:

self.longPressGestureRecognizer.minimumPressDuration = .05;

这将允许您在不触发按钮的情况下轻扫按钮,并且还可以让您按下按钮并触发其突出显示。希望这有帮助。

尝试在滚动视图子类中重载此方法:

- (BOOL)touchesShouldCancelInContentView:(UIView *)view
{
    // fix conflicts with scrolling and button highlighting delay:
    if ([view isKindOfClass:[UIButton class]])
        return YES;
    else
        return [super touchesShouldCancelInContentView:view];
}

我不确定 OP 是否只是想要视觉反馈,但如果是这样,在代码中将 showsTouchWhenHighlighted 属性设置为 YES/true 或在 IB 中选中 Shows Touch On Highlight 选项将完成此操作。

最新更新