Environment: Xcode 6 Beta 4
I'm attempting to merely look into a text value using
the debugger. However the debugger fails to identify the static variable (via 'Let'). This is also true for vars.
Why?
func textFieldShouldReturn(textField:UITextField) -> Bool {
let myText = "Hello World"
let theText = textField.text! as String
return true
}
Here's the debugger result:
(lldb) po textField error: :1:1: error: use of unresolved identifier 'textField' textField ^ :11:5: error: use of unresolved identifier '$__lldb_injected_self' $__lldb_injected_self.$__lldb_wrapped_expr_29(
^ (lldb) po myText error: :1:1: error: use of unresolved identifier 'myText' myText ^ :11:5: error: use of unresolved identifier '$__lldb_injected_self' $__lldb_injected_self.$__lldb_wrapped_expr_30(
^ (lldb) po theText error: :1:1: error: use of unresolved identifier 'theText' theText ^ :11:5: error: use of unresolved identifier '$__lldb_injected_self' $__lldb_injected_self.$__lldb_wrapped_expr_31(
^ (lldb)
Note: debug output is set to 'All Output.
Here's the screenshot:
This is a problem I also encountered, and I think it is a bug in the debugger. If you do not use ANY variables declared with 'let', the po command will work. This is off course not what you want so I filed a bug with Apple for this issue.
I think you should just hope it is fixed in the next beta (file a bug too please, as number of filed bugs will influence Apple's priority in fixing them). In the meantime, go with Amitays workaround.
As confirmed by others above, this is pretty much strictly a bug in Swift / LLDB. It was mostly working as of 6.1.1, broken for or before 6.3 Beta 1, and fixed again in 6.3 Beta 2.
I am just using a command line app as a test and can't test with UIKit, but I have seen similar problems outside of UIKit - and by problems, I mean that I got results like the OP, but now it is working:
struct Foobar {
var foo:String
var bar:String
}
func textFieldShouldReturn() -> Bool {
let fubar = Foobar(foo: "Onesy", bar: "Twosy")
let myText = "Hello World"
return true
}
textFieldShouldReturn()
p and po yield slightly different results, and depend on whether or not Printable is implemented:
(lldb) po fubar
(foo = "Onesy", bar = "Twosy")
(lldb) p fubar
(AssertClientMacDirect.Foobar) $R1 = (foo = "Onesy", bar = "Twosy")
Per the thread here: https://devforums.apple.com/message/1111705#1111705, you can also use the image lookup -t <SymbolName>
command
image lookup -t Fubar
<path redacted>
id = {0x1000003e0}, name = "AssertMac.Fubar", byte-size = 8, clang_type = "class Fubar {
class func `new`(name: Swift.String) -> AssertMac.Fubar
init(name: Swift.String)
func test()
var someValue: Swift.String
var name: Swift.String
@objc deinit
}
It is worth emphasizing though, that you should double check that the Swift compiler is set to:
If you implement Printable on a swift class, then you will get the results of the description property.
There were previous Xcode bugs where Xcode would crash when trying to step through optimized code.
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