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Swift Macro 不使用 Swift Package Manager如何集成

• Swift Macro分为两部分,一部分为宏的具体实现(编译器插件),一部分为Macro Lib用于导出宏定义以及所需要的附属代码,这里说的不使用SPM指的是编译器插件这部分
• 仔细观察Xcode使用SPM集成Macro时，在编译命令中通过-load-plugin-executable参数指定了对应宏实现的插件可执行文件路径
• 同时在swift源码中也找到了相关参数TypeCheckMacros.cpp TypeCheckMacros.cpp
• 从swift源码中可得知，宏实现插件即可以是动态库(dylib)也可以是可执行文件
• 系统内置的宏实现是通过 -plugin-path <dylib path> 加载
• 内置的宏实现动态库在Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/Lib/swift/host/plugins

具体步骤

• 编写宏实现代码,这一步可以通过SPM也可以直接通过Xcode创建命令行程序项目,完成宏实现代码编写

fatbobman

@propertyWrapper
public struct PublishedObject<Value: ObservableObject> { // wrappedValue 要求符合 ObservableObject
    public var wrappedValue: Value

    public init(wrappedValue: Value) {
        self.wrappedValue = wrappedValue
    }

    public static subscript<OuterSelf: ObservableObject>(
        _enclosingInstance observed: OuterSelf,

ytyubox

From

var fib_6 = {
  v: Int -> Int  in
  if v <= 1  { return v }
  return ???(v - 1) + ???(v - 2)
}(6)

to

msepcot

//
//  ViewController.swift
//  WatchAndLearn
//
//  Created by Michael Sepcot on 9/18/19.
//  Copyright © 2019 Michael Sepcot. All rights reserved.
//

import UIKit
import HealthKit

importRyan

Reliable mouseEnter/Exit for SwiftUI

On Mac, SwiftUI's .onHover closure is not always called on mouse exit, particularly with high cursor velocity. A grid of targets or with finer target shapes will often have multiple targets falsely active after the mouse has moved on.

It is easy to run back to AppKit's safety. Below is a SwiftUI-like modifier for reliable mouse-tracking. You can easily adapt it for other mouse tracking needs.

import SwiftUI

jordansinger

import SwiftUI
import PlaygroundSupport

struct Desktop: View {
    var body: some View {
        ZStack {
//              Image(uiImage: #imageLiteral(resourceName: "IMG_6281.JPG"))
            Color(UIColor.systemBlue)
            macOS()
        }

ethanhuang13

//
//  FacebookAuth.swift
//  GitHub: ethanhuang13
//  Twitter: @ethanhuang13

import AuthenticationServices
import SafariServices

/*
 Updated: 

b3ll

//
//  BlurryVibrantView.swift
//
//
//  Created by Adam Bell on 11/9/19.
//  Copyright © 2019 Adam Bell. All rights reserved.
//

import SwiftUI
import UIKit

steipete

Here's what needs to be done in order to use security scoped bookmarks on Mac Catalyst:

1. You need an entitlement: "com.apple.security.files.bookmarks.app-scope" needs to be se to 1.

2. Pass both NSURLBookmarkCreationWithSecurityScope and NSURLBookmarkCreationSecurityScopeAllowOnlyReadAccess when creating the bookmark.

Note: The headers mark these API as unavailable for iOS, and this indeed does only work on Mac and not iOS. However, Mac Catalyst really is a Mac app, so using these values is fine. In order to allow compilation, use following:

unnamedd

/**
 *  MacEditorTextView
 *  Copyright (c) Thiago Holanda 2020-2021
 *  https://twitter.com/tholanda
 *
 *  MIT license
 */

import Combine
import SwiftUI