Question

我在swift项目中导入了这个Objective-C类。的 MMLANSCanner.h

#import <Foundation/Foundation.h>

@class Device;
@protocol MMLANScannerDelegate;
@protocol MMLANScannerDelegate <NSObject>
@required
- (void)lanScanDidFinishScanningWithStatus:(MMLanScannerStatus)status;
- (void)lanScanDidFailedToScan;
@optional
- (void)lanScanProgressPinged:(float)pingedHosts from:(NSInteger)overallHosts;
@end

#pragma mark - Public methods
@interface MMLANScanner : NSObject
-(instancetype)initWithDelegate:(id <MMLANScannerDelegate>)delegate;
@property(nonatomic,weak) id<MMLANScannerDelegate> delegate;
@property(nonatomic,assign,readonly)BOOL isScanning;
- (void)start;
- (void)stop;
@end

我成功创建了桥接头并使MainVC.Swift符合MMLANScannerDelegate。然后我尝试使用委托self初始化MMLanScanner。

import UIKit
import Foundation

class MainVC: UIViewController, MMLANScannerDelegate {

    var presenter = MMLANScanner(delegate:self)

    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    func lanScanDidFindNewDevice(_ device: Device!) {

    }

    func lanScanDidFailedToScan() {

    }

    func lanScanDidFinishScanning(with status: MMLanScannerStatus) {

    }

    func lanScanProgressPinged(_ pingedHosts: Float, from overallHosts: Int) {

    }
}

但我得到错误：

传递给不带参数的调用的参数

如何实现我在Objective-C中使用的initWithDelegate函数？

Answer 1

MLANScanner不会将delegate参数设为init方法（delegate是MLANScanner的属性

您的presenter属性定义也存在问题，因为self在创建MainVC时无效。

请改为：

let presenter = MLANScanner()

override func viewDidLoad() {
    super.viewDidLoad()

    presenter.delegate = self
}

基于编辑问题：

var presenter: MLANScanner!

override func viewDidLoad() {
    super.viewDidLoad()

    presenter = MLANScanner(delegate: self)
}

注意：我编辑的答案假定在某处有一个暴露init(delegate:)方法的Swift桥。可能没有，并且使一个超出了这个问题的范围。由于委托不是私有或只读，因此几乎可以肯定使用我发布的第一个版本。

Objective-C类的initWithDelegate

1 个答案: