RxSwift 之绑定UILabel

最新推荐文章于 2025-03-17 22:40:16 发布

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这个博客展示了如何在iOS应用中使用RxSwift和RxCocoa来创建一个数据模型`MusicDataModel`，并实现在`ViewController`中加载音乐列表。通过`Observable.interval`更新UILabel的字体大小，并定义了一个自定义的UILabel扩展来绑定字体大小。

//
//  ViewController.swift
//  LeanRxSwift
//
//  Created by maochengfang on 2021/4/27.
//

import UIKit
import RxSwift
import RxCocoa

import Foundation
struct Music {
    let name: String;
    let singer:String;
    init(name:String,singer:String) {
        self.name = name
        self.singer = singer
    }
}

extension Music : CustomStringConvertible{
    var description: String {
        return "name \(name) singer \(singer)"
    }
}

struct MusicDataModel {
    let data = Observable.just([
        Music(name: "光年之外", singer: "摩登兄弟"),
        
        Music(name: "光年之外1", singer: "摩登兄弟1"),
        Music(name: "光年之外2", singer: "摩登兄弟2"),
        Music(name: "光年之外3", singer: "摩登兄弟3"),
        Music(name: "光年之外4", singer: "摩登兄弟4"),
        Music(name: "光年之外5", singer: "摩登兄弟5"),

    ])
    
}

class ViewController: UIViewController {
   
    let musicDataModel = MusicDataModel()
//    var tableView: UITableView!
    var label : UILabel!
    
    
    let cellID = "testCellID"
    let disposeBag = DisposeBag()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
        self.label = UILabel(frame: CGRect(x: 0, y: 250, width: 360, height: 50))
        self.label.font = UIFont.systemFont(ofSize: 10)
        self.label.textColor = UIColor.systemPink
        self.label.textAlignment = NSTextAlignment.center
        self.label.text = "Hello Word"
        self.view.addSubview(self.label)
        
        let observable = Observable<Int>.interval(0.5, scheduler: MainScheduler.instance)
        observable.map{CGFloat($0)}.bind(to: label.fonsSize).disposed(by: disposeBag)
    }
}

extension UILabel {
    
    public var fonsSize:Binder<CGFloat>{
        return Binder(self){
            label, fontSize in label.font = UIFont.systemFont(ofSize: fontSize)
        }
    }
}