直播平臺原始碼，自定義下拉重新整理控制元件

直播平臺原始碼，自定義下拉重新整理控制元件

import Foundation
import UIKit
import SnapKit
class XRefreshControl: UIRefreshControl {
    var observation: NSKeyValueObservation?
    var isLocalRefreshing: Bool = false
    let indicator = UIProgressView(progressViewStyle: .bar)
    var refreshingBlock: (()->Void)?
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        
        observation = observe(
            \.frame,
             options: .new
        ) { [weak self] object, change in
            if self?.isRefreshing == true {
                if self?.isLocalRefreshing == false {
                    if self?.refreshingBlock != nil {
                        self?.refreshingBlock!()
                    }
                }
                self?.isLocalRefreshing = true
            } else {
                let height = change.newValue!.height
                self?.indicator.progress = min(Float(abs(height / 60)), 1)
            }
        }
    }
    convenience init(refreshingBlock: @escaping ()->Void) {
        self.init(frame: .zero)
        
        self.refreshingBlock = refreshingBlock
        
        self.layer.masksToBounds = true
        self.backgroundColor = .red
        
        let v = UIView()
        v.backgroundColor = .red
        
        let center = UIView()
        v.addSubview(center)
        
        let title = UILabel()
        title.text = "載入中"
        title.textColor = .black
        center.addSubview(title)
        
        indicator.layer.masksToBounds = true
        center.addSubview(indicator)
        
        self.addSubview(v)
        v.snp.makeConstraints { make in
            make.edges.equalToSuperview()
        }
        center.snp.makeConstraints { make in
            make.center.equalToSuperview()
            make.width.equalToSuperview()
        }
        indicator.snp.makeConstraints { make in
            make.top.equalToSuperview()
            make.width.height.equalTo(32)
            make.centerX.equalToSuperview()
        }
        title.snp.makeConstraints { make in
            make.top.equalTo(indicator.snp.bottom)
            make.bottom.equalToSuperview()
            make.centerX.equalToSuperview()
        }
    }
    
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    deinit {
        observation = nil
    }
    
    override func endRefreshing() {
        super.endRefreshing()
        
        self.isLocalRefreshing = false
        indicator.progress = 0
    }
}
extension UITableView {
    func endRefreshing() {
        if ((self.refreshControl?.isKind(of: XRefreshControl.self)) != nil) {
            self.refreshControl?.endRefreshing()
        }
    }
}

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