如何在 UserDefaults 中保存 Double 数组?
How can I save an array of Double in UserDefaults?
如何在 UserDefaults
中保存 Double 数组?
为什么我的 UserDefaults
评估为零?
print(UserDefaults.standard.object(forKey: "num")!)
if var o = UserDefaults.standard.object(forKey: "num") as? [Double] {
o.insert(Double(self.slid), at: 0)
print("opa \(o)")
UserDefaults.standard.removeObject(forKey: "num")
UserDefaults.standard.set(o, forKey: "num")
if let z = UserDefaults.standard.object(forKey: "num") {
print(z)
}
} else {
UserDefaults.standard.set(Double(self.slid), forKey: "num")
if let z = UserDefaults.standard.object(forKey: "num") {
print("kl \(z)")
} else {
print("nilo")
}
}
您最初应该将值设置为双 [Double]
数组,而不是单个 Double
。修改为下面一行:
UserDefaults.standard.set(Double(self.slid), forKey: "num")
收件人:
UserDefaults.standard.set([Double(self.slid)], forKey: "num")
这是您需要的完整代码:
if var array = UserDefaults.standard.object(forKey: "num") as? [Double] {
array.insert(Double(self.slid), at: 0)
UserDefaults.standard.set(array, forKey: "num")
} else {
UserDefaults.standard.set([Double(self.slid)], forKey: "num")
}
print(UserDefaults.standard.object(forKey: "num"))
如何在 UserDefaults
中保存 Double 数组?
为什么我的 UserDefaults
评估为零?
print(UserDefaults.standard.object(forKey: "num")!)
if var o = UserDefaults.standard.object(forKey: "num") as? [Double] {
o.insert(Double(self.slid), at: 0)
print("opa \(o)")
UserDefaults.standard.removeObject(forKey: "num")
UserDefaults.standard.set(o, forKey: "num")
if let z = UserDefaults.standard.object(forKey: "num") {
print(z)
}
} else {
UserDefaults.standard.set(Double(self.slid), forKey: "num")
if let z = UserDefaults.standard.object(forKey: "num") {
print("kl \(z)")
} else {
print("nilo")
}
}
您最初应该将值设置为双 [Double]
数组,而不是单个 Double
。修改为下面一行:
UserDefaults.standard.set(Double(self.slid), forKey: "num")
收件人:
UserDefaults.standard.set([Double(self.slid)], forKey: "num")
这是您需要的完整代码:
if var array = UserDefaults.standard.object(forKey: "num") as? [Double] {
array.insert(Double(self.slid), at: 0)
UserDefaults.standard.set(array, forKey: "num")
} else {
UserDefaults.standard.set([Double(self.slid)], forKey: "num")
}
print(UserDefaults.standard.object(forKey: "num"))