添加標題視圖後，滾動的UITableView底部原因NSException

Question

我有我的滾動到UITableView底部的方法：

func tableViewScrollToBottom(_ animated: Bool) { 

    let delay = 0.1 * Double(NSEC_PER_SEC) 
    let time = DispatchTime.now() + Double(Int64(delay))/Double(NSEC_PER_SEC) 

    DispatchQueue.main.asyncAfter(deadline: time, execute: { 
     print(self.tview.numberOfRows(inSection: 0)) 
     print(self.tview.numberOfSections) 
     let indexPath = IndexPath(row: self.tview.numberOfRows(inSection: 0), section: self.tview.numberOfSections) 
     print(indexPath) 
     print("it will crash now") 
     self.tview.scrollToRow(at: indexPath, at: .bottom, animated: animated) 

    }) 
} 

它以前工作，但是當我添加標題視圖 - 它崩潰。

我在控制檯中看到：

8 
1 
[1, 8] 
it will crash now 

，所以我不明白爲什麼這條線：

self.tview.scrollToRow(at: indexPath, at: .bottom, animated: animated) 

導致崩潰。我在這裏錯過了什麼？

Answer 1

你有這個

let indexPath = IndexPath(row: self.tview.numberOfRows(inSection: 0), section: self.tview.numberOfSections) 

問題嘗試做-1

let indexPath = IndexPath(row: self.tview.numberOfRows(inSection: 0)-1, section: self.tview.numberOfSections-1)