Ios 错误无法为类型为'；的值下标；字典<；NSObject，AnyObject>'；索引类型为'；字符串'；

有人能帮我吗？我刚刚将我的小项目从Objective-C重新编程到Swift，出现以下错误：

无法使用“String”类型的索引为“Dictionary”类型的值下标

eins

、

zwei

、

drei

和

vier

是从另一个视图控制器获取数据的字符串

目标C代码：

@property (strong, nonatomic) IBOutlet UISwitch *bluetoothSwitch;

- (void)viewDidLoad
{
    [super viewDidLoad];

    NSString *SwitchState;
    NSArray *myStrings = [[NSArray alloc] initWithObjects:eins,zwei,drei, vier, nil];
    SwitchState = [myStrings componentsJoinedByString:mad:" | | "];
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSApplicationSupportDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString *path = [documentsDirectory stringByAppendingPathComponent:mad:"store.plist"];

    NSFileManager *fileManager = [NSFileManager defaultManager];

    if (![fileManager fileExistsAtPath: path]) {
        path = [documentsDirectory stringByAppendingPathComponent: [NSString stringWithFormat:mad:"store.plist"] ];
    }

    NSMutableDictionary *savedValue = [[NSMutableDictionary alloc] initWithContentsOfFile: path];
    if ([[savedValue objectForKey:SwitchState] boolValue]) {
        self.bluetoothSwitch.on = [[savedValue objectForKey:SwitchState] boolValue];
    } else {
    }
}

我的Swift代码：

var eins = "Test"
var zwei = "Text"
var drei = "Test"
var vier = "Text"
var SwitchState = ""
let myStrings = [eins, zwei, drei, vier]
SwitchState = myStrings.joined(separator: " | | ")
let paths = NSSearchPathForDirectoriesInDomains(.applicationSupportDirectory, .userDomainMask, true)
let documentsDirectory = paths[0]
var path = URL(fileURLWithPath: documentsDirectory).appendingPathComponent("store.plist").absoluteString

let fileManager = FileManager.default

if !fileManager.fileExists(atPath: path) {
    path = URL(fileURLWithPath: documentsDirectory).appendingPathComponent("store.plist").absoluteString
}

var savedValue = NSDictionary(contentsOfFile: path) as Dictionary?
print("Das bekommt viewdid: \(SwitchState)")
if (savedValue?[SwitchState] as? NSNumber)?.boolValue ?? false {
    bluetoothSwitch.isOn = (savedValue?[SwitchState] as? NSNumber)?.boolValue ?? false
} else {
    print("nein")
}

这两行“产生”了错误

if (savedValue?[SwitchState] as? NSNumber)?.boolValue ?? false {
    bluetoothSwitch.isOn = (savedValue?[SwitchState] as? NSNumber)?.boolValue ?? false

---

请不要试图将Objective-C代码逐字翻译成Swift。从Swift的角度来看，有很多很多不好的做法

如果有本机对应的类，基本上不要在Swift中使用

NS…

类

发生此错误的原因是，从

NSDictionary

转换到

Dictionary

（未指定Swift类型）的桥接结果是

Dictionary

，它与值类型

字符串

不兼容

这是一个真正的Swift版本：

let eins = "Test"
let zwei = "Text"
let drei = "Test"
let vier = "Text"
let myStrings = [eins, zwei, drei, vier]
let switchState = myStrings.joined(separator: " | | ")
let fileManager = FileManager.default
do {
    let applicationSupportDirectory = try fileManager.url(for: .applicationSupportDirectory, in: .userDomainMask, appropriateFor: nil, create: true)
    let storeURL = applicationSupportDirectory.appendingPathComponent("store.plist")

    let data = try Data(contentsOf: storeURL)
    print("Das bekommt viewdid: \(switchState)")
    if let savedDictionary = try PropertyListSerialization.propertyList(from: data, format: nil) as? [String:Any],
        let savedState = savedDictionary[switchState] as? Bool {
        bluetoothSwitch.isOn = savedState
    } else {
        bluetoothSwitch.isOn = false
        print("nein")
    }
} catch { print(error) }

---

文件存在（atPath

检查是多余的，所以我忽略了它。

到底是哪一行导致了错误？我更新了帖子