- RangeText =“{playlistNames = []时的类型检查语句让requestLibrary = NSFetchRequest(entityName:”Library“)
let request = NSFetchRequest<NSFetchRequestResult>(entityName: "Playlist") request.sortDescriptors = [playlistSortDescriptor] playlists = try? context.fetch(request) as NSArray! print("Playlist Count - ",playlists.count) let librarys:NSArray! = try? context.fetch(requestLibrary) as NSArray! for library in librarys{ let libraryName = (library as AnyObject).value(forKey: "library") as! String playlistNames += [libraryName] } for playlist in playlists{ let playlistName = (playlist as AnyObject).value(forKey: "playlistName") as! String if playlistName == "Library" { playlistNames.insert(playlistName, at: 0) }else { playlistNames += [playlistName] } }
}”- 虽然在RangeText =“playlists = try?context.fetch(request)中将类型检查表达式作为NSArray!”错误:分段错误:11
这是代码:
func refreshPlaylists(){
playlistNames = []
let requestLibrary = NSFetchRequest<NSFetchRequestResult>(entityName: "Library")
let request = NSFetchRequest<NSFetchRequestResult>(entityName: "Playlist")
request.sortDescriptors = [playlistSortDescriptor]
playlists = try? context.fetch(request) as NSArray!
print("Playlist Count - ",playlists.count)
let librarys:NSArray! = try? context.fetch(requestLibrary) as NSArray!
for library in librarys{
let libraryName = (library as AnyObject).value(forKey: "library") as! String
playlistNames += [libraryName]
}
for playlist in playlists{
let playlistName = (playlist as AnyObject).value(forKey: "playlistName") as! String
if playlistName == "Library" {
playlistNames.insert(playlistName, at: 0)
}else {
playlistNames += [playlistName]
}
}
}
它在我更新到Xcode 10之前有效。任何想法?
没有像NSArray!
这样的类型,在任何情况下都没有任何理由让你施展它。全程删除as NSArray!
。使用Swift类型。