【发布时间】：2023-03-07 10:58:01
【问题描述】：
我检查了该属性的拼写错误，绝对不是这种情况。我正在尝试使用我在parseSongs() 函数内的类中声明的属性mySong。
该函数不在类中，但在同一个文件中。该类的目标成员资格设置为项目名称，其他文件也是如此。
我很困惑为什么编译器无法识别parseSongs() 中我的属性名称？
我可以在类之外声明该属性，但即使它是在类中声明的，我也应该能够使用它。
import UIKit
class SongsTableViewController: UITableViewController {
//A property that is an array of type 'Song'
var mySong = [Song]()
private let cache = NSCache()
private func fetchMyData(){
let myUrl = NSURL(string: "http://itunes.apple.com/search?term=beatles&country=us")!
let mySession = NSURLSession.sharedSession()
//The work to be queued initiates
let myTask = mySession.dataTaskWithURL(myUrl){
//This closure right here is the Completion Handler
data, response, error in
if error != nil{
//Handle error
}else{
let myHttpResponse = response as! NSHTTPURLResponse
switch myHttpResponse.statusCode {
case 200..<300:
print("OK")
print("data: \(data)")
default: print("request failed: \(myHttpResponse.statusCode)")
}
}
}
myTask.resume()
}
}
func parseJson(myData data: NSData){
do{
let json: AnyObject? = try NSJSONSerialization.JSONObjectWithData(data, options: [])
if let unwrappedJson: AnyObject = json{
parseSongs(unwrappedJson)
}
}catch{
}
}
func parseSongs(json1: AnyObject){
mySong = []
//Optional Binding
if let array = json1["results"] as? [[String:AnyObject]]{
//For-In loop
for songDictionary in array{
if let title = songDictionary["trackName"] as? NSString{
if let artist = songDictionary["artistName"] as? NSString{
if let albumName = songDictionary ["collectionName"] as? NSString{
if let artWorkUrl = songDictionary["artWorkUrl100"] as? NSString {
let song = Song(artist: (artist as String), title: (title as String), albumName: (albumName as String), artWorkUrl: (artWorkUrl as String))
mySong.append(song)
}
}
}
}
}
dispatch_async(dispatch_get_main_queue()){
self.tableView.reloadData()
}
}
}
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标签： swift properties declaration