I simply opened arboreus_examples/qt6/CMake/UsingSwift/UsingSwift_v3/CMakeLists.txt in QT Creator and was able to build it and run.
In its main.cpp it creates a Swift wrapper and calls method:
ASwift* oSwift = new ASwift(&oEngine);
oSwift->mInit();
_A_DEBUG << oSwift->mString();
Its Swift code has some @objc attributes:
import Foundation
@objcMembers class ASwiftIOSSwift: NSObject {
override init() {
super.init();
print("ASwiftIOSSwift init");
}
@objc func mString() -> NSString {
let oString: NSString = "SwiftString";
return oString;
}
}
Yandex Mobile Ads also requires -objC flag:
Objective-C wrapper:
class ASwiftIOSNative : public QObject {
Q_OBJECT
public:
explicit ASwiftIOSNative(QObject* parent = nullptr);
virtual ~ASwiftIOSNative(void);
QString mString(void);
};
// iOS Class header
#import "aswiftiosobjc.h"
// Global variables
static ASwiftIOSObjC* gSwiftIOSObjC __unused = nil;
// iOS Class
@implementation ASwiftIOSObjC
// ---------------------------------------
#pragma mark Init
+(ASwiftIOSObjC*) mInstance {
static dispatch_once_t oPredicate;
static ASwiftIOSObjC* oSharedDelegate = nil;
dispatch_once(&oPredicate, ^{
oSharedDelegate = [[super alloc] init];
_A_DEBUG << "ASwiftIOSObjC instance created";
});
_A_DEBUG << "ASwiftIOSObjC instance shared";
return oSharedDelegate;
}
-(instancetype) init {
self = [super init];
if (self) {
[self setPSwift:[[ASwiftIOSSwift alloc] init]];
_A_DEBUG << "ASwiftIOSObjC init";
}
return self;
}
@end
// -----------
// Qt part
// -----------
QT_BEGIN_NAMESPACE
// Class header
#include "aswiftiosnative.h"
// -----------
/*!
\fn
Doc.
*/
ASwiftIOSNative::ASwiftIOSNative(QObject* parent) : QObject(parent) {
gSwiftIOSObjC = [ASwiftIOSObjC mInstance];
_A_DEBUG << "ASwiftIOSNative created";
}
// -----------
/*!
\fn
Doc.
*/
ASwiftIOSNative::~ASwiftIOSNative(void) {
_A_DEBUG << "ASwiftIOSNative deleted";
}
// -----------
/*!
\fn
Doc.
*/
QString ASwiftIOSNative::mString(void) {
QString oString = QString::fromNSString([gSwiftIOSObjC.pSwift mString]);
return oString;
}
QT_END_NAMESPACE
ASwift is a redundant C++ class that uses Objective-C object internally:
class ASwift : public QObject {
Q_OBJECT
public:
explicit ASwift(QObject* parent = nullptr);
virtual ~ASwift(void);
void mInit(void);
QString mString(void);
private:
ASwiftIOSNative* pIOSNative = nullptr;
};
It is not clear enough is it possible to make the following code work in a QT6 app:
CMake Examples for Swift
https://github.com/compnerd/swift-cmake-examples
Simple project with a library that depends on an external package which is built as part of the build