聊天功能(三)--创建TextCell、ImageCell等

根据上一篇内容创建好了ChatMessageCell为父类,分别创建ChatTextCell、ChatImageCell和ChatVoiceCell.

一、ChatTextCell.swift

import UIKit
import Cartography

public class ChatTextCell: ChatMessageCell {
    public let contentLabel = UILabel.init()
    
    override init(style: UITableViewCellStyle, reuseIdentifier: String?) {
        // 将MessageView设置成contentLabel,父类会设置其布局
        super.init(style: style, reuseIdentifier: reuseIdentifier, messageView: contentLabel)
        
        contentLabel.font = UIFont.systemFont(ofSize: 16)
        contentLabel.numberOfLines = 0
    }
    required public init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    override public var message: Message? {
        didSet {
            if let message = message {
                contentLabel.text = message.comment
            }
        }
    }
}

二、ChatImageCell.swift

import UIKit
import Cartography

public class ChatImageCell: ChatMessageCell {
    public let contentImageView = UIImageView.init()
    
    override init(style: UITableViewCellStyle, reuseIdentifier: String?) {
        super.init(style: style, reuseIdentifier: reuseIdentifier, messageView: contentImageView, backgroundImageView: nil)
        
        contentImageView.layer.masksToBounds = true
        contentImageView.layer.cornerRadius = 10
    }
    required public init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    override public var message: Message? {
        didSet {
            if let message = message {
                let image: UIImage? = imageCache().object(forKey: message.comment as AnyObject) as? UIImage
                if let image = image {
                    contentImageView.image = image
                }else{                    
                    let img = UIImage.init(contentsOfFile: Bundle.main.path(forResource: message.comment, ofType: nil)!)!
                    let contentSize = self.minification(img.size, default: CGSize.init(width: 160, height: 320))
                    let image = self.scale(image:img, size: contentSize)
                    contentImageView.image = image
                    DispatchQueue.global().async {
                        if image != nil {
                            imageCache().setObject(image!, forKey: message.comment as AnyObject)
                        }
                    }
                }
            }
        }
    }
    /// 缩放尺寸
    func minification(_ size: CGSize, default defaultSize: CGSize) -> CGSize {
        let multiple: CGFloat = min(defaultSize.width/size.width, defaultSize.height/size.height)
        // 输入multiple大于1,说明没有标准尺寸大,不需要缩放
        return multiple > 1 ? size : CGSize.init(width: ceil(size.width * multiple), height: ceil(size.height * multiple))
    }
    /// 缩放图片
    func scale(image: UIImage, size: CGSize) -> UIImage? {
        UIGraphicsBeginImageContextWithOptions(size, false, 0.0)
        if image.size == size {
            return image
        }
        image.draw(in: CGRect.init(origin: CGPoint.zero, size: size))
        let scaledImage = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        return scaledImage
    }
}

三、ChatVoiceCell.swift

public class ChatVoiceCell: ChatMessageCell {
    
    
    public let backImageView = UIImageView.init()
    public let voiceView: VoiceView = VoiceView.init()
    
    override init(style: UITableViewCellStyle, reuseIdentifier: String?) {
        super.init(style: style, reuseIdentifier: reuseIdentifier, messageView: voiceView, backgroundImageView: backImageView)
        
        self.tapGestureBlock = {[unowned self] (tap) in
            if self.voiceView.isAnimating {
                VoiceManager.shared.stopVoice()
                self.voiceView.stopAnimating()
            }else{
                let isSuccess = VoiceManager.shared.playVoice(self.message!)
                if isSuccess {
                    self.voiceView.startAnimating()
                }else{
                    print("播放出错")
                }
            }
        }
        
        NotificationCenter.default.addObserver(self, selector: #selector(voicePlay(notify:)), name: Notification.Name.ChatVoicePlayNotification, object: nil)
    }
    
    @objc func voicePlay(notify: NSNotification){
        let message = notify.object as? Message
        if message == nil || message != self.message {
            if self.voiceView.isAnimating {
                self.voiceView.stopAnimating()
            }
        }
    }
    
    deinit {
        NotificationCenter.default.removeObserver(self)
    }
    required public init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    override public var message: Message? {
        didSet {
            if let message = message {
                voiceView.from = message.from
                voiceView.duration = Int(message.comment) ?? 0
                if VoiceManager.shared.message == message {
                    voiceView.startAnimating()
                }
            }
        }
    }
}

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下一篇:聊天功能(四)--创建ChatViewController

Demo地址:MAChatTableViewDemo