这是警告我应该关注的吗？
override func prepare(for segue: UIStoryboardSegue,sender: Any?) {
if let destination = segue.destination as? ProfileViewController{
let cell = sender as! UITableViewCell
let selectedRow = myTableView.indexPath(for: cell)!.row
switch (mySegmentedControl.selectedSegmentIndex){
case 0:
destination.nameVar = userSFList[selectedRow].name!
destination.imageOneURL = userSFList[selectedRow].image!
destination.bioVar = userSFList[selectedRow].bio!
if let image2 = userSFList[selectedRow].imageTwo {
destination.imageTwoUrl = image2 }
if let contactInt = userSFList[selectedRow].contact as? Int {
destination.contact = contactInt
}
break
case 1:
destination.nameVar = userEBList[selectedRow].name!
destination.imageOneURL = userEBList[selectedRow].image!
destination.imageTwoUrl = userEBList[selectedRow].imageTwo!
if let contactInt = userEBList[selectedRow].contact as? Int {
destination.contact = contactInt
}
break
case 2:
destination.nameVar = userSFOList[selectedRow].name!
destination.imageOneURL = userSFOList[selectedRow].image!
if let contactInt = userSFOList[selectedRow].contact as? Int {
destination.contact = contactInt
}
break
case 3:
destination.nameVar = userSJList[selectedRow].name!
destination.imageOneURL = userSJList[selectedRow].image!
if let contactInt = userSJList[selectedRow].contact as? Int {
destination.contact = contactInt
}
break
default:
break
}
}
}
我正在使用具有四个不同段的分段控件并使用firebase提取数据.
解决方法
我的个人规则始终是零警告.
比抱歉更安全.
比抱歉更安全.
联系人是否可选？如果是这样…
你可以使用Optional Binding：
if let contactInt = userSFOList[selectRow].contact as? Int {
destination.contact = contactInt
}
destination.contact = userSFOList[selectedRow].contact.intValue ?? <Your default Int here>
您也可以使用@ Kamil.S指出的guard,如：
guard let nameVar = userSFOList[selectedRow].name,let imageVar = userSFOList[selectedRow].image,let contactVar = contact as? Int else {
// Conditions were Failed. `return` or `throw`.
}
destination.nameVar = nameVar
destination.imageOneURL = imageVar
destination.contact = contactVar