小编e98*_*987的帖子

当使用Xcode 7.3将iOS框架添加到iOS项目(常规 - >链接框架和库)时,Xcode使用两个不同的图标来表示iOS框架.一个看起来像一个白色的立方体,另一个看起来像一个工具箱.每个图标的含义是什么？

我想拥有三个SwiftUI Toggles并具有它们，以便如果其中一个打开，则其他两个关闭。

使用UIKit做这种事情的老方法是didSet {}，这不是SwiftUI的正确方法。我不知道是否有必要研究Combine来解决这个问题，从表面上看，这似乎应该很简单。

import SwiftUI

// Mutually exclusive toggle switches: when one toggle is on, the other two should be off. This is a start, where to go from here?

struct Junk: View {

    @State private var isOn1:Bool = true
    @State private var isOn2:Bool = false
    @State private var isOn3:Bool = false

    var body: some View
    {
        VStack
        {
            Toggle("T1", isOn: $isOn1)
            Toggle("T2", isOn: $isOn2)
            Toggle("T3", isOn: $isOn3)
        }
    }
}

struct Junk_Previews: PreviewProvider
{
    static var previews: some …

我正在使用 Swift 5.1，并且有一个深度嵌套的 json 文件，我只想访问 json 文件中的一些元素并忽略其余数据。例如，我只想要下面 json 字符串中数组中的“artistName”和“releaseDate”值。如果我使用嵌套的可解码结构，我不想需要声明每个键名称只是为了获取这两个值的数组。

\n{"feed":{"title":"Coming Soon","id":"https://rss.itunes.apple.com/api/v1/us/apple-music/coming-soon/all/10/explicit.json","author":{"name":"iTunes Store","uri":"http://wwww.apple.com/us/itunes/"},"links":[{"self":"https://rss.itunes.apple.com/api/v1/us/apple-music/coming-soon/all/10/explicit.json"},{"alternate":"https://itunes.apple.com/WebObjects/MZStore.woa/wa/viewRoom?fcId=1396220241\\u0026app=music"}],"copyright":"Copyright \xc2\xa9 2018 Apple Inc. All rights reserved.","country":"us","icon":"http://itunes.apple.com/favicon.ico","updated":"2019-12-04T01:48:22.000-08:00",\n\n    "results":[{"artistName":"Stormzy","id":"1487951013","releaseDate":"2019-12-13","name":"Heavy Is The Head","kind":"album","copyright":"\xe2\x84\x97 2019 Hashtag Merky Music Limited under exclusive license to Atlantic Records UK, a division of Warner Music UK Limited.","artistId":"394865154","contentAdvisoryRating":"Explicit","artistUrl":"https://music.apple.com/us/artist/stormzy/394865154?app=music","artworkUrl100":"https://is5-ssl.mzstatic.com/image/thumb/Music123/v4/3c/a8/7c/3ca87c13-bffa-3ebd-eec6-68ea78ab556d/190295403003.jpg/200x200bb.png","genres":[{"genreId":"18","name":"Hip-Hop/Rap","url":"https://itunes.apple.com/us/genre/id18"},{"genreId":"34","name":"Music","url":"https://itunes.apple.com/us/genre/id34"}],"url":"https://music.apple.com/us/album/heavy-is-the-head/1487951013?app=music"},{"artistName":"Camila Cabello","id":"1487577356","releaseDate":"2019-12-06","name":"Romance","kind":"album","copyright":"\xe2\x84\x97 2019 Simco Ltd. under exclusive license to Epic Records, a division of Sony Music Entertainment","artistId":"935727853","contentAdvisoryRating":"Explicit","artistUrl":"https://music.apple.com/us/artist/camila-cabello/935727853?app=music","artworkUrl100":"https://is4-ssl.mzstatic.com/image/thumb/Music113/v4/fa/89/c7/fa89c706-fecc-2ece-cfc2-661c42807fbd/886448121220.jpg/200x200bb.png","genres":[{"genreId":"14","name":"Pop","url":"https://itunes.apple.com/us/genre/id14"},{"genreId":"34","name":"Music","url":"https://itunes.apple.com/us/genre/id34"}],"url":"https://music.apple.com/us/album/romance/1487577356?app=music"},{"artistName":"Harry Styles","id":"1485802965","releaseDate":"2019-12-13","name":"Fine Line","kind":"album","copyright":"\xe2\x84\x97 2019 Erskine Records Limited, under exclusive license to Columbia Records, a Division of Sony Music Entertainment","artistId":"471260289","artistUrl":"https://music.apple.com/us/artist/harry-styles/471260289?app=music","artworkUrl100":"https://is4-ssl.mzstatic.com/image/thumb/Music113/v4/72/89/85/728985d1-9484-7b71-1ea8-0f0654f7dc16/886448022213.jpg/200x200bb.png","genres":[{"genreId":"14","name":"Pop","url":"https://itunes.apple.com/us/genre/id14"},{"genreId":"34","name":"Music","url":"https://itunes.apple.com/us/genre/id34"}],"url":"https://music.apple.com/us/album/fine-line/1485802965?app=music"},{"artistName":"Grimes","id":"1487294744","releaseDate":"2020-02-21","name":"Miss Anthropocene","kind":"album","copyright":"\xe2\x84\x97 2020 4AD …