从 Swift 调用 Objective C 方法

Question

我正在 Swift 中构建一个导入一些 .h 文件的应用程序。我有这些定义：

RTCEAGLVideoView.h

@interface RTCEAGLVideoView : UIView <RTCVideoRenderer>
   @property(nonatomic, weak) id<RTCEAGLVideoViewDelegate> delegate;
@end

RTCVideoRenderer.h

@protocol RTCVideoRenderer<NSObject>
// The size of the frame.
- (void)setSize:(CGSize)size;
// The frame to be displayed.
- (void)renderFrame:(RTCI420Frame*)frame;
@end

现在，在ViewController中，我有一个RTCEAGLVideoView类型的对象，我想调用renderFrame方法。

@IBOutlet weak var remoteView: RTCEAGLVideoView!
...
self.remoteView.renderFrame(nil)

但是我收到此错误：

Value of type 'RTCVideoRenderer' has no member 'renderFrame'

任何帮助将不胜感激。

编辑：RTCI420帧

#import <Foundation/Foundation.h>
// RTCI420Frame is an ObjectiveC version of cricket::VideoFrame.
@interface RTCI420Frame : NSObject
@property(nonatomic, readonly) NSUInteger width;
@property(nonatomic, readonly) NSUInteger height;
@property(nonatomic, readonly) NSUInteger chromaWidth;
@property(nonatomic, readonly) NSUInteger chromaHeight;
@property(nonatomic, readonly) NSUInteger chromaSize;
// These can return NULL if the object is not backed by a buffer.
@property(nonatomic, readonly) const uint8_t* yPlane;
@property(nonatomic, readonly) const uint8_t* uPlane;
@property(nonatomic, readonly) const uint8_t* vPlane;
@property(nonatomic, readonly) NSInteger yPitch;
@property(nonatomic, readonly) NSInteger uPitch;
@property(nonatomic, readonly) NSInteger vPitch;
- (BOOL)makeExclusive;
#ifndef DOXYGEN_SHOULD_SKIP_THIS
// Disallow init and don't add to documentation
- (id)init __attribute__((
    unavailable("init is not a supported initializer for this class.")));
#endif /* DOXYGEN_SHOULD_SKIP_THIS */
@end

Answer 1

我试图复制您的问题，但它对虚拟文件来说效果很好。 我怀疑您的问题不是桥接所有依赖标头。

以下是对我有用的文件：

RTCEAGLVideoView.h
----
#import <UIKit/UIKit.h>
#import "RTCEAGLVideoViewDelegate.h"
#import "RTCEAGLVideoView.h"
#import "RTCVideoRenderer.h"
@interface RTCEAGLVideoView : UIView <RTCVideoRenderer>
@property(nonatomic, weak) id<RTCEAGLVideoViewDelegate> delegate;
@end

RTCEAGLVideoView.m
----
#import "RTCEAGLVideoView.h"
@implementation RTCEAGLVideoView
/*
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect {
    // Drawing code
}
*/
- (void)renderFrame:(RTCI420Frame*)frame {
    NSLog(@"Render frame was called");
}
- (void)setSize:(CGSize)size {
    NSLog(@"Size set");
}
@end


RTCEAGLVideoViewDelegate.h
----
#import <Foundation/Foundation.h>
@protocol RTCEAGLVideoViewDelegate <NSObject>
@end


RTCI420Frame.h
----
#import <Foundation/Foundation.h>
@interface RTCI420Frame : NSObject
@end

RTCI420Frame.m
----
#import "RTCI420Frame.h"
@implementation RTCI420Frame
@end

RTCVideoRenderer.h
----
#import <Foundation/Foundation.h>
#import "RTCI420Frame.h"
@protocol RTCVideoRenderer <NSObject>
// The size of the frame.
- (void)setSize:(CGSize)size;
// The frame to be displayed.
- (void)renderFrame:(RTCI420Frame*)frame;
@end

RenderThing-Bridging-Header.h
----
//
//  Use this file to import your target's public headers that you would like to expose to Swift.
//
#import <UIKit/UIKit.h>
#import "RTCEAGLVideoViewDelegate.h"
#import "RTCEAGLVideoView.h"
#import "RTCVideoRenderer.h"


ViewController.swift
----

import UIKit
class ViewController: UIViewController {
    @IBOutlet weak var remoteView: RTCEAGLVideoView!

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
    }
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        self.remoteView.renderFrame(nil)
    }
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

}

特别注意RenderThing-Bridging-Header.h文件中的差异