swift - 尝试以编程方式制作退格按钮以执行与键盘删除 (ᗏX) 按钮相同的操作

Question

@objc func searchButtonTap() { 
    searchBar.becomeFirstResponder()
    var remove = searchBar.text
    remove = String(remove!.dropLast())
    searchBar.text = remove 
}

还尝试了两次退格

@objc func searchButtonTap() { 
    let name: String = searchBar.text!
    let endIndex = name.index(name.endIndex, offsetBy: -2)
    let truncated = String(name[..<endIndex])
    searchBar.text = truncated 
}

Answer 1

假设您想要在用户点击后退(搜索？)按钮时删除搜索栏文本的最后一个字符。所以，

@objc func searchButtonTap() { 
    guard !(searchBar.text?.isEmpty ?? true) else { return } //Making sure that you don't hit the "Fatal error: Can't remove more items from a collection than it contains"
    searchBar.text?.removeLast(1)
}