Question

我有background也是UIView，其上有3 UIViews个子视图。我为每个人添加了UIPanGestureRecognizer，希望当用户向左拖动视图时，相应的UIView会水平扩展。继承我的代码：

func labelPanned(sender:UIPanGestureRecognizer!){
    self.labelBeingMoved = sender.view.tag
    if(sender.state == UIGestureRecognizerState.Began || sender.state == UIGestureRecognizerState.Changed){
        var translation:CGPoint = sender.translationInView(self.background)
        self.labelCurrWidth += translation.x
        NSLog("self.labelCurrWidth is now %f", self.labelCurrWidth)
        if(self.labelCurrWidth <= self.labelOriginalWidth || self.labelCurrWidth >= self.labelMaxWidth){self.labelCurrWidth -= translation.x}
        sender.setTranslation(CGPointZero, inView: self.background)
        dispatch_async(dispatch_get_main_queue(), {
            self.background.setNeedsLayout()
            })
    }
}

在我layoutSubviews()的电话中：

func layoutSubviews(){
    NSLog("layoutSubviews called")
    switch self.labelBeingMoved{
    case 1:
        NSLog("CASE 1")
        self.labelbg.frame = CGRectMake(self.labelbg.frame.origin.x, self.labelbg.frame.origin.y, self.labelCurrWidth, self.labelbg.frame.height)
    case 2:
        NSLog("CASE 2")
        self.label1bg.frame = CGRectMake(self.label1bg.frame.origin.x, self.label1bg.frame.origin.y, self.labelCurrWidth, self.label1bg.frame.height)
    case 3:
        NSLog("CASE 3")
        self.label2bg.frame = CGRectMake(self.label2bg.frame.origin.x, self.label2bg.frame.origin.y, self.labelCurrWidth, self.label2bg.frame.height)
    default:
        NSLog("An unknown error occurred")
    }
}

很简单，但它不知何故不起作用，我无法弄清楚什么是错的。我也试过self.view.setNeedsLayout()，但也没有运气。 * labelbg是UIView s，而非UILabel s。

提前致谢！

Answer 1

您可能忘记添加＆＃39;覆盖＆＃39; layoutSubviews方法前面的关键字

Swift：setNeubLayout没有调用layoutSubviews

1 个答案: