Question

我刚刚开始使用应该通过Arduino UNO运行DIY数控机器的应用程序。我找到了一些用Objective-C编写的串行通信资源，所以我想我会尝试让它工作。我正在尝试实现一个功能，它将搜索计算机上的可用串行端口，并在下拉菜单中显示它们。

Xcode并没有抱怨任何Objective-C组件，所以我现在假设这不是问题。但是，Xcode给出了错误：“使用未解析的标识符'refreshSerialList'”。这是Apple建议在Swift中调用Objective-C方法的方式：https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/BuildingCocoaApps/MixandMatch.html

Serial.h

#import <Cocoa/Cocoa.h>

// import IOKit headers
#include <IOKit/IOKitLib.h>
#include <IOKit/serial/IOSerialKeys.h>
#include <IOKit/IOBSD.h>
#include <IOKit/serial/ioss.h>
#include <sys/ioctl.h>

@interface Serial : NSObject {
IBOutlet NSPopUpButton *serialListPullDown;
}

- (void) refreshSerialList: (NSString *) selectedText;

@end

Serial.m

#import "Serial.h"

@implementation Serial

- (void) refreshSerialList: (NSString *) selectedText {
    io_object_t serialPort;
    io_iterator_t serialPortIterator;

    // remove everything from the pull down list
    [serialListPullDown removeAllItems];

    // ask for all the serial ports
    IOServiceGetMatchingServices(kIOMasterPortDefault,     IOServiceMatching(kIOSerialBSDServiceValue), &serialPortIterator);

    // loop through all the serial ports and add them to the array
    while (serialPort == IOIteratorNext(serialPortIterator)) {
        [serialListPullDown addItemWithTitle:
         (__bridge NSString*)IORegistryEntryCreateCFProperty(serialPort,     CFSTR(kIOCalloutDeviceKey),  kCFAllocatorDefault, 0)];
        IOObjectRelease(serialPort);
    }

    // add the selected text to the top
    [serialListPullDown insertItemWithTitle:selectedText atIndex:0];
    [serialListPullDown selectItemAtIndex:0];

    IOObjectRelease(serialPortIterator);
}

@end

桥接Header.h

#import "Serial.h"

AppDelegate.Swift

import Cocoa

class AppDelegate: NSObject, NSApplicationDelegate {

    @IBOutlet var window: NSWindow!

    @IBOutlet var CommandInput : NSView!

    @IBOutlet var serialListPullDown : NSPopUpButton!


    func applicationDidFinishLaunching(aNotification: NSNotification?) {
        // Insert code here to initialize your application

        let refresh = refreshSerialList()

    }

    func applicationWillTerminate(aNotification: NSNotification?) {
        // Insert code here to tear down your application
    }

    @IBAction func CommandSend(sender : AnyObject) {
    }

}

Answer 1

refreshSerialList接受一个参数，一个字符串。首先，您必须创建一个Serial：

的实例

var serial = Serial()

然后在实例上调用方法：

serial.refreshSerialList("some string")

将Objective-C方法实现到Swift程序中

1 个答案: