Xcode Beta 6.1 和 Xcode 6 GM 由于奇怪的原因卡住索引 [英] Xcode Beta 6.1 and Xcode 6 GM stuck indexing for weird reason

问题描述

我正在开发一个 swift 应用程序，在某些时候我有一个类似于这样的代码:

I'm developing a swift application that at some point I have a code similar to this:

 import UIKit

class ViewController: UIViewController {
    private var a: UIImageView!
    private var b: UIImageView!
    private var c: UILabel!
    private var d: UILabel!
    private var e: UILabel!
    private var f: UILabel!
    private var g: UIView!
    private var h: UIView!
    private var i: UIView!
    private var j: UIView!
    private var k: UIImageView!
    private var l: UIView!
    private var m: UIView!
    private var n: UIView!
    private var o: UIView!
    private var p: UIScrollView!
    private var q: UIView!

    override func viewDidLoad() {
        super.viewDidLoad()

        let viewBindingsDict = ["a" : a,
            "b" : b,
            "c" : c,
            "d" : d,
            "e" : e,
            "f" : f,
            "g" : g,
            "h" : h,
            "i" : i,
            "j" : j,
            "k" : k,
            "l" : l,
            "m" : m,
            "n" : n,
            "o" : o,
            "p" : p]
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
}

由于某种原因，当我添加这段代码时，xcode 卡住了，我无法做任何其他事情.

For some reason, when I add this code, xcode gets stuck and I can't do anything else.

打开活动监视器，它会显示使用超过 100% CPU 的 sourcekitservice 和 swift.

Opening the Activity Monitor, it displays sourcekitservice and swift using more than 100% CPU.

我用上面的代码创建了这个示例项目:https://dl.dropboxusercontent.com/u/1393279/aaaaaaa.zip

I've created this sample project with the code above : https://dl.dropboxusercontent.com/u/1393279/aaaaaaa.zip

我已经尝试清理派生数据、重新安装 Xcode、重新启动、等待几分钟等.但它不起作用.

I've already tried cleaning derived data, reinstalling Xcode, rebooting, waiting minutes, etc. It just doesn't work.

推荐答案

类似的事情发生在我身上几次，我通过将长语句分成多行解决了这个问题.

Something similar happened to me a few times, and I solved it by splitting long statements into multiple lines.

我在操场上测试了您的代码，我立即注意到 SourceKitService 进程占用了我 100% 的 CPU.

I tested your code in a playground, and I immediately noticed the SourceKitService process eating 100% of my CPU.

在您的代码中，我看到最长的语句是字典初始化，因此第一种方法是使其可变并使用每行少量项目进行初始化.

In your code the longest statement I see is the dictionary initialization, so a first approach would be to make it mutable and initialize with a short number of items per line.

Swift 没有为字典提供 += 运算符，所以我们首先需要一个(感谢 @shucao):

Swift doesn't provide a += operator for dictionaries, so we first need one (kudos to @shucao):

func +=<K, V> (inout left: Dictionary<K, V>, right: Dictionary<K, V>) -> Dictionary<K, V> {
    for (k, v) in right {
        left.updateValue(v, forKey: k)
    }
    return left
}

在您的工具集中使用它，您可以按如下方式初始化字典:

With that in your toolset, you can initialize the dictionary as follows:

var viewBindingsDict = ["a" : a, "b" : b, "c" : c, "d" : d, "e" : e]
viewBindingsDict += ["f" : f, "g" : g, "h" : h, "i" : i, "j" : j]
viewBindingsDict += ["k" : k, "l" : l, "m" : m, "n" : n, "o" : o]
viewBindingsDict += ["p" : p]

每行最多选择 5 个项目.

choosing a max of 5 items per line.

但是在您的代码中，您将字典声明为不可变的 - swift 没有提供任何语句来在声明之后初始化不可变的 - 幸运的是我们可以使用闭包来实现:

But in your code you declared the dictionary as immutable - swift doesn't provide any statement to initialize an immutable after its declaration - fortunately we can use a closure to achieve that:

let viewBindingsDict = { () -> [String:UIView] in
    var bindings = ["a" : self.a, "b" : self.b, "c" : self.c, "d" : self.d, "e": self.e]
    bindings += ["f": self.f, "g" : self.g, "h" : self.h, "i" : self.i, "j" : self.j]
    bindings += ["k" : self.k, "l" : self.l, "m" : self.m, "n" : self.n,  "o" : self.o]
    bindings += ["p": self.p]
    return bindings
}()

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