Mixing
why is this if let code in Swift Xcode 10.1 throwing a Thread 1: signal SIGABART
This code in Swift Xcode 10.1 keeps throwing a Thread 1: signal SIGABART error and I don't know why.
let item = UserDefaults.standard.object(forKey: "To Does")
var arrayItem:[String]
print("about to check")
if let arrayItem2 = item as! [String]?{
arrayItem = arrayItem2
arrayItem.append(textInput.text!)
UserDefaults.standard.set(arrayItem, forKey: "To Does")
print(arrayItem)
}else{
UserDefaults.standard.set(textInput.text!, forKey: "To Does")
}
textInput.text = ""
swift
asked Nov 22 '18 at 4:17
Jensen CoonradtJensen Coonradt
112
add a comment |
This code in Swift Xcode 10.1 keeps throwing a Thread 1: signal SIGABART error and I don't know why.
let item = UserDefaults.standard.object(forKey: "To Does")
var arrayItem:[String]
print("about to check")
if let arrayItem2 = item as! [String]?{
arrayItem = arrayItem2
arrayItem.append(textInput.text!)
UserDefaults.standard.set(arrayItem, forKey: "To Does")
print(arrayItem)
}else{
UserDefaults.standard.set(textInput.text!, forKey: "To Does")
}
textInput.text = ""
swift
asked Nov 22 '18 at 4:17
Jensen CoonradtJensen Coonradt
112
3
Why use force cast when you are already usingif letanyway?
– Ricky Mo
Nov 22 '18 at 4:34
add a comment |
This code in Swift Xcode 10.1 keeps throwing a Thread 1: signal SIGABART error and I don't know why.
let item = UserDefaults.standard.object(forKey: "To Does")
var arrayItem:[String]
print("about to check")
if let arrayItem2 = item as! [String]?{
arrayItem = arrayItem2
arrayItem.append(textInput.text!)
UserDefaults.standard.set(arrayItem, forKey: "To Does")
print(arrayItem)
}else{
UserDefaults.standard.set(textInput.text!, forKey: "To Does")
}
textInput.text = ""
swift
asked Nov 22 '18 at 4:17
Jensen CoonradtJensen Coonradt
112
This code in Swift Xcode 10.1 keeps throwing a Thread 1: signal SIGABART error and I don't know why.
let item = UserDefaults.standard.object(forKey: "To Does")
var arrayItem:[String]
print("about to check")
if let arrayItem2 = item as! [String]?{
arrayItem = arrayItem2
arrayItem.append(textInput.text!)
UserDefaults.standard.set(arrayItem, forKey: "To Does")
print(arrayItem)
}else{
UserDefaults.standard.set(textInput.text!, forKey: "To Does")
}
textInput.text = ""
swift
swift
asked Nov 22 '18 at 4:17
Jensen CoonradtJensen Coonradt
112
asked Nov 22 '18 at 4:17
Jensen CoonradtJensen Coonradt
112
asked Nov 22 '18 at 4:17
Jensen CoonradtJensen Coonradt
112
asked Nov 22 '18 at 4:17
Jensen CoonradtJensen Coonradt
112
asked Nov 22 '18 at 4:17
Jensen CoonradtJensen Coonradt
112
112
3
Why use force cast when you are already usingif letanyway?
– Ricky Mo
Nov 22 '18 at 4:34
add a comment |
3
Why use force cast when you are already usingif letanyway?
– Ricky Mo
Nov 22 '18 at 4:34
3
3
Why use force cast when you are already using
if let anyway?– Ricky Mo
Nov 22 '18 at 4:34
Why use force cast when you are already using
if let anyway?– Ricky Mo
Nov 22 '18 at 4:34
add a comment |
2 Answers
2
active
oldest
votes
Never use a forced cast with if let. Never force cast to an optional. Neither make any sense.
Even once you fix that you have a problem. You first write a string to user defaults if there is nothing yet for the key. But then you try to read an array. That will never work.
Simplify your code and always write an read an array.
var items = UserDefaults.standard.array(forKey: "To Does") as? [String] ??
items.append(textInput.text!)
UserDefaults.standard.set(items, forKey: "To Does")
answered Nov 22 '18 at 4:35
rmaddyrmaddy
243k27320382
Thank you so much!
– Jensen Coonradt
Nov 22 '18 at 18:34
add a comment |
Try printing an item to console. Chances are it's neither nil, nor an [String] and it fails a forced cast.
If it's not - you can use a simpler cast. Try this in playground:
let item: Any? = 2
var arrayItem: [String] =
print("about to check")
if let arrayItem2 = item as? [String] {
arrayItem = arrayItem2
arrayItem.append("foo")
print(arrayItem)
} else {
print("doing nothing")
}
Outputs:
about to check
doing nothing
answered Nov 22 '18 at 4:24
EimantasEimantas
43k14116154
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
Never use a forced cast with if let. Never force cast to an optional. Neither make any sense.
Even once you fix that you have a problem. You first write a string to user defaults if there is nothing yet for the key. But then you try to read an array. That will never work.
Simplify your code and always write an read an array.
var items = UserDefaults.standard.array(forKey: "To Does") as? [String] ??
items.append(textInput.text!)
UserDefaults.standard.set(items, forKey: "To Does")
answered Nov 22 '18 at 4:35
rmaddyrmaddy
243k27320382
Thank you so much!
– Jensen Coonradt
Nov 22 '18 at 18:34
add a comment |
Never use a forced cast with if let. Never force cast to an optional. Neither make any sense.
Even once you fix that you have a problem. You first write a string to user defaults if there is nothing yet for the key. But then you try to read an array. That will never work.
Simplify your code and always write an read an array.
var items = UserDefaults.standard.array(forKey: "To Does") as? [String] ??
items.append(textInput.text!)
UserDefaults.standard.set(items, forKey: "To Does")
answered Nov 22 '18 at 4:35
rmaddyrmaddy
243k27320382
Thank you so much!
– Jensen Coonradt
Nov 22 '18 at 18:34
add a comment |
Never use a forced cast with if let. Never force cast to an optional. Neither make any sense.
Even once you fix that you have a problem. You first write a string to user defaults if there is nothing yet for the key. But then you try to read an array. That will never work.
Simplify your code and always write an read an array.
var items = UserDefaults.standard.array(forKey: "To Does") as? [String] ??
items.append(textInput.text!)
UserDefaults.standard.set(items, forKey: "To Does")
answered Nov 22 '18 at 4:35
rmaddyrmaddy
243k27320382
Never use a forced cast with if let. Never force cast to an optional. Neither make any sense.
Even once you fix that you have a problem. You first write a string to user defaults if there is nothing yet for the key. But then you try to read an array. That will never work.
Simplify your code and always write an read an array.
var items = UserDefaults.standard.array(forKey: "To Does") as? [String] ??
items.append(textInput.text!)
UserDefaults.standard.set(items, forKey: "To Does")
answered Nov 22 '18 at 4:35
rmaddyrmaddy
243k27320382
answered Nov 22 '18 at 4:35
rmaddyrmaddy
243k27320382
answered Nov 22 '18 at 4:35
rmaddyrmaddy
243k27320382
answered Nov 22 '18 at 4:35
rmaddyrmaddy
243k27320382
243k27320382
Thank you so much!
– Jensen Coonradt
Nov 22 '18 at 18:34
add a comment |
Thank you so much!
– Jensen Coonradt
Nov 22 '18 at 18:34
Thank you so much!
– Jensen Coonradt
Nov 22 '18 at 18:34
Thank you so much!
– Jensen Coonradt
Nov 22 '18 at 18:34
add a comment |
Try printing an item to console. Chances are it's neither nil, nor an [String] and it fails a forced cast.
If it's not - you can use a simpler cast. Try this in playground:
let item: Any? = 2
var arrayItem: [String] =
print("about to check")
if let arrayItem2 = item as? [String] {
arrayItem = arrayItem2
arrayItem.append("foo")
print(arrayItem)
} else {
print("doing nothing")
}
Outputs:
about to check
doing nothing
answered Nov 22 '18 at 4:24
EimantasEimantas
43k14116154
add a comment |
Try printing an item to console. Chances are it's neither nil, nor an [String] and it fails a forced cast.
If it's not - you can use a simpler cast. Try this in playground:
let item: Any? = 2
var arrayItem: [String] =
print("about to check")
if let arrayItem2 = item as? [String] {
arrayItem = arrayItem2
arrayItem.append("foo")
print(arrayItem)
} else {
print("doing nothing")
}
Outputs:
about to check
doing nothing
answered Nov 22 '18 at 4:24
EimantasEimantas
43k14116154
add a comment |
Try printing an item to console. Chances are it's neither nil, nor an [String] and it fails a forced cast.
If it's not - you can use a simpler cast. Try this in playground:
let item: Any? = 2
var arrayItem: [String] =
print("about to check")
if let arrayItem2 = item as? [String] {
arrayItem = arrayItem2
arrayItem.append("foo")
print(arrayItem)
} else {
print("doing nothing")
}
Outputs:
about to check
doing nothing
answered Nov 22 '18 at 4:24
EimantasEimantas
43k14116154
Try printing an item to console. Chances are it's neither nil, nor an [String] and it fails a forced cast.
If it's not - you can use a simpler cast. Try this in playground:
let item: Any? = 2
var arrayItem: [String] =
print("about to check")
if let arrayItem2 = item as? [String] {
arrayItem = arrayItem2
arrayItem.append("foo")
print(arrayItem)
} else {
print("doing nothing")
}
Outputs:
about to check
doing nothing
answered Nov 22 '18 at 4:24
EimantasEimantas
43k14116154
edited Nov 22 '18 at 4:30
answered Nov 22 '18 at 4:24
EimantasEimantas
43k14116154
answered Nov 22 '18 at 4:24
EimantasEimantas
43k14116154
answered Nov 22 '18 at 4:24
EimantasEimantas
43k14116154
43k14116154
add a comment |
add a comment |
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3
Why use force cast when you are already using
if letanyway?– Ricky Mo
Nov 22 '18 at 4:34