I am working on the ios project. I didn't have any problem at the moment. However, there is a problem with iOS 11.4 version of iPhone 6.
I've already built my project with the iOS 12.4 iPhone 6 device, and there's nothing wrong with it.
This is a problem when you connect a physical device. My error is as follows.
Undefined symbols for architecture arm64:
"_UTTypeConformsTo", referenced from:
myapp.Document.uti(_: Swift.String, conformsTo: Swift.String) -> Swift.Bool in Document.o
ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
Undefined symbol : _UTTypeConformsTo
I have this function in the `Document.swift` file.
**Document.swift**
~~~swift
class Document: UIDocument {
var fileData: Data?
var filesText: Data?
func uti(_ uti: String, conformsTo candidateParent: String) -> Bool {
return UTTypeConformsTo(uti as CFString, candidateParent as CFString)
}
...
override func load(fromContents contents: Any, ofType typeName: String?) throws {
if let fileType = typeName {
if fileType == "public.png" || fileType == "public.jpeg" { // .jpg not recognized
if let fileContents = contents as? Data {
fileData = fileContents
}
} else if !uti(typeName!, conformsTo: "public.data") {
throw IXError.fileAcessFailed
} else {
if let fileContents = contents as? Data {
filesText = fileContents
}
print("File type unsupported.")
}
} // end if let fileType = typeName
} // end func load~~~
problematic environment:
- Xcode: Version 11.0
- Device : IPhone 6 and 11.4 ios version // get Error
- Device : IPhone 6 and 12.4 ios version // This device operates normally.
The two devices are different.
There have been no problems so far, but problems occur when trying to build this device. What's the problem?
##EDIT ###
The error appears to occur when the developer info is set to 11.4. However, 11.4 devices must also be able to be built. What is the fundamental solution?
