一、DZNEmptyDataSet使用

// 偏移量 - 向上偏移64像素
func verticalOffset(forEmptyDataSet scrollView: UIScrollView) -> CGFloat {
    return -64.0
}

// 顯示圖片
func image(forEmptyDataSet scrollView: UIScrollView) -> UIImage? {
    return UIImage(named: "blank")
}

// 允許刷新
func emptyDataSetShouldAllowScroll(_ scrollView: UIScrollView) -> Bool {
    return true
}

// 文字顯示
func title(forEmptyDataSet scrollView: UIScrollView) -> NSAttributedString? {
    let title = "暫時(shí)沒有數(shù)據(jù)"
    let attributes = [NSFontAttributeName: UIFont.boldSystemFont(ofSize: 15),
                      NSForegroundColorAttributeName: UIColor(hexColor: "c5c5c5")]
    return NSAttributedString(string: title, attributes: attributes)
}
    
// 點(diǎn)擊重試
func buttonTitle(forEmptyDataSet scrollView: UIScrollView, for state: UIControlState) -> NSAttributedString? {
    let title = "暫時(shí)沒有數(shù)據(jù)，請(qǐng)點(diǎn)擊重試哦~"
    let font = UIFont.systemFont(ofSize: 15)
    let attString = NSMutableAttributedString(string: title)
    attString.addAttribute(NSFontAttributeName, value: font, range: NSMakeRange(0, title.characters.count))
    attString.addAttribute(NSForegroundColorAttributeName, value: UIColor(hexColor: "c5c5c5"), range: NSMakeRange(0, title.characters.count))
    attString.addAttribute(NSForegroundColorAttributeName, value: UIColor(hexColor: "0093fa"), range: NSMakeRange(8, 4))
    return attString
}

// 自定義視圖
func customView(forEmptyDataSet scrollView: UIScrollView) -> UIView? {
    // 當(dāng)數(shù)據(jù)還沒有加載完成的時(shí)候，顯示空
    return isLoadDataFinish ? PlaceHolderView() : nil
}