Question

我在Swift 1.2中有一个代码来创建一个dispatch_block_t数组，它工作正常。但是相同的代码在Swift 2.0中引发了错误。

var menuView: btSimplePopUP!

let actions: [dispatch_block_t] = [{self.pickImages()},
    {self.takePicture()},
    {self.pickVideos()},
    {self.shootVideo()},
    {self.recordAudio()},
    {self.closeView()}]

menuView = btSimplePopUP(itemImage: imgs as [AnyObject],
    andTitles: titles as [AnyObject],
    andActionArray:  actions as NSArray as [AnyObject],
    addToViewController: self)

以上代码在Swift 1.2中运行良好。但在Swift 2.0中，它会抛出以下错误

[dispatch_block_t]无法转换为NSArray

如何使用dispatch_block_t创建NSArray？

更新

我已将上述代码替换为以下代码，

let actions: [Any] = [{self.pickImages()},
                    {self.takePicture()},
                    {self.pickVideos()},
                    {self.shootVideo()},
                    {self.recordAudio()},
                    {self.closeView()}]

menuView = btSimplePopUP(itemImage: imgs as [AnyObject],
        andTitles: titles as [AnyObject],
        andActionArray:  actions as! [AnyObject],
        addToViewController: self)

现在，上一个错误消失了。但是我在运行时遇到以下错误，

致命错误：数组元素无法桥接到Objective-C

任何帮助将不胜感激。

Answer 1

import XCPlayground
XCPlaygroundPage.currentPage.needsIndefiniteExecution = false

import Foundation

let a: dispatch_block_t = {
    print("a")
}
let b: dispatch_block_t = {
    print("b")
}
let arr = [a,b]
print(arr.dynamicType)
arr.forEach { (b) -> () in
    b()
}
/* prints
Array<@convention(block) () -> ()>
a
b
*/
class Block {
    var block: dispatch_block_t
    init(block: dispatch_block_t){
        self.block = block
    }
}
let block1 = Block(block: a)
let block2 = Block(block: b)

let arr2: NSArray = [block1,block2]
print(arr2)
arr2.forEach { (p) -> () in
    (p as? Block)?.block()
}
/* prints
(
    Block,
    Block
)
a
b
*/

Answer 2

dispatch_block_t不是从AnyObject继承的，它不是对象。但您可以修改代码并将AnyObject更改为Any，如下所示：

andActionArray : actions as [Any]

它应该适合你。

UPD：

你的函数将参数作为NSArray，你可以简单地将数组转换为这种类型，这段代码可以在我的快捷游乐场中运行：

func pickImages() {}
func takePicture() {}
func shootVideo() {}

let actions: [dispatch_block_t] = [{pickImages()},
    {takePicture()},
    {shootVideo()}]
var actionArray: NSArray = actions as NSArray // pass it to the btSimplePopUP init

如何在Swift 2.0中创建dispatch_block_t数组？

2 个答案: