0
按行我的意思是每行是数组的不同索引(按顺序)。如何打印数组作为行中的标签(Swift 3)
这里是我的班,将持有的歌曲(数组是空的,因为现在因为用户需要输入的歌曲,但是以另一种视图控制器完成)的列表:
class Songs {
private var _songs : [String]
var songs : [String]
{
get
{
return _songs
}
set (newSongs)
{
_songs = newSongs
}
}
init(songs: [String])
{
self._songs = songs
}
func songList() -> [String] {
let songs = _songs
return songs
}
}
var songList = Songs (songs: [String]())
第三视图控制器中我想标签显示阵列:
class ThirdViewController: UIViewController {
// Properties
@IBOutlet weak var songList_lbl: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
var multiLineString = songList.songList()
multiLineString.joined(separator: "\n") // warning telling me separator is unused
songList_lbl.text = multiLineString // error telling me cannot assign value of type '[String]' to type 'String?'
songList_lbl.numberOfLines = 0 // code I found but haven't tested out yet
songList_lbl.lineBreakMode = NSLineBreakMode.byWordWrapping
songList_lbl.sizeToFit()
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
我也尝试转储数组,但我仍然得到值类型错误。
其他的方式:改变行'multiLineString.joined(分隔符:“\ n “)to'multiLineString.join(separator:”\ n“)' – muescha
我得到一个致命错误::意外地发现nil,同时展开一个可选值(线程1 exc_bad_instruction(code = exc_1386_invop subcode = 0x0)) code:songList_lbl.text = multiLineString.joined(separator:“\ n”) – Michael