Question

有没有人知道如何在重新加载某个部分时闪烁自定义部分页眉/页脚视图？

Section(header:"",footer:"") {section in
    section.tag = "main"
    var header = HeaderFooterView<GenericSection>(HeaderFooterProvider.Class)
    header.onSetupView = { v,s in
        v.label.frame = CGRect(x: 0, y: 0, width: UIScreen.mainScreen().bounds.width - 30, height: 20 )
        v.label.text = self.row.title
        v.label.numberOfLines = 0
        v.label.textAlignment = .Justified
        v.label.font = UIFont.preferredFontForTextStyle(UIFontTextStyleHeadline)
        v.label.textColor = UIColor(red:0.47, green:0.47, blue:0.49, alpha:1.0)
        v.label.frame = v.label.bounds
        v.label.sizeToFit()
        v.bounds = CGRect(x: -8, y: -8, width: v.label.bounds.width - 15, height: v.label.bounds.height + 25)
    }
    section.header = header
    section.footer = nil
}

如果我使用Section(header:"test",footer:"test2")标题视图永远不会闪烁任何形式的修改，这是我想要的。但是，我使用自定义边距并在标题中添加图标，这就是为什么我需要自定义视图作为页眉/页脚。是否有一个我没有在.onSetupView上设置的属性可以解决这个问题？

Answer 1

您的问题与您的header视图一次又一次重新加载有关，并反复调整其框架，因此您只需添加bool变量即可解决此问题

有问题

没有问题

class GenericSection: UIView {
    let label = UILabel()
    var positioned = false
    override init(frame: CGRect) {
        super.init(frame: frame)
        label.frame = CGRect(x: 0,y: 0,width: self.bounds.size.width - 30, height: 40)
        self.addSubview(label)
    }

    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
}

然后

form +++ Section(header:"",footer:"") {section in
            section.tag = "main"
            var header = HeaderFooterView<GenericSection>(HeaderFooterProvider.Class)
            header.onSetupView = { v,s in
                if(!v.positioned)
                {
                v.layer.borderColor = UIColor.redColor().CGColor
                v.layer.borderWidth = 1
                v.label.frame = CGRect(x: 0, y: 0, width: UIScreen.mainScreen().bounds.width - 30, height: 20 )
                v.label.text = "Testing Custom Header without issue"
                v.label.numberOfLines = 0
                v.label.textAlignment = .Justified
                v.label.font = UIFont.preferredFontForTextStyle(UIFontTextStyleHeadline)
                v.label.textColor = UIColor(red:0.47, green:0.47, blue:0.49, alpha:1.0)
                v.label.frame = v.label.bounds
                v.label.sizeToFit()
                v.bounds = CGRect(x: -8, y: -8, width: v.label.bounds.width - 15, height: v.label.bounds.height + 25)
                v.setNeedsLayout()
                v.setNeedsDisplay()
                v.positioned = true
                }
            }
            section.header = header
            section.footer = nil
        }

我希望这可以帮助你，问候

如何防止自定义标题在部分更新时闪烁？

1 个答案: