ios - 尝试从 UIView 访问标签

Question

我创建了一个 .xib 文件，其中包含一堆标签，可与 SwipeView 一起使用。 。我的问题是我无法/不知道如何在加载 View 后访问和更改其文本:

let newView = NSBundle.mainBundle().loadNibNamed("SwipeHelperView", owner: self, options: nil)[0] as UIView

for (var subview) in newView.subviews
{           
    if (subview.isKindOfClass(UILabel) && subview.tag == 0)
    {
        subview.text = "asdaS" //ERROR: cannot assign 'text' in 'subview'
    }                
}

当场创建标签会更容易吗，如下所示:

var label = UILabel(frame: CGRectMake(0, 0, 200, 21))
label.center = CGPointMake(0, 0)
label.text = "some text"
newView.addSubview(label)

而不是尝试从“newView”UIView 访问它们？有“推荐”方式还是与偏好有关？

Answer 1

你应该转换它:

let newView = NSBundle.mainBundle().loadNibNamed("SwipeHelperView", owner: self, options: nil)[0] as UIView

for subview in newView.subviews as [UIView]
{           
    if subview.tag == 0
    {
        if let label = subview as? UILabel {
            label.text = "asdaS"
        }
    }                
}

如果您设置自定义标签(例如 333)，您可以获得它:

if let label = newView.viewWithTag(333) as? UILabel {
    label.text = "TEST"
}