小编jac*_*ert的帖子

我知道这是非常基本的,我开始使用swift,我找不到一个有效的例子.

我想点击图片并采取行动.IBOutlet链接到主故事板上的图像.当我点击它时,我什么都没得到.我期待得到一个控制台消息.我究竟做错了什么？

import UIKit

class FirstViewController: UIViewController {

    @IBOutlet weak var tapView: UIImageView!
    let tapRec = UITapGestureRecognizer()

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.

        tapRec.addTarget(self, action: "tappedView")
        tapView.addGestureRecognizer(tapRec)

    }

    func tappedView(){
        println("image tapped")
    }

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


}

我正在将我的应用程序从Swift升级到Swift 2并遇到以下错误: 'deviceInputWithDevice' is unavailable: use object construction 'AVCaptureDeviceInput(device:error:)'

这是有问题的代码:

    let captureDevice = AVCaptureDevice.defaultDeviceWithMediaType(AVMediaTypeVideo)
    var input:AVCaptureDeviceInput
    let error:NSError?

    do {
        let input = try AVCaptureDeviceInput.deviceInputWithDevice(captureDevice) as AVCaptureDeviceInput
    } catch let error as NSError {
        print(error)
    }

有人可以帮我理解建议的解决方案:"使用对象构造'AVCaptureDeviceInput(device:error :)'"以及我如何实现它？

我有一个数组:result [i].我想遍历数组中的每个字段并将其附加到我页面中的元素.

$("tr:first").after(result[i]);

但我希望这会延迟发生.

一直在努力克服每个循环和延迟的队列如何工作,但我似乎无法解决它.我可以得到一个延迟,但只有在它们全部附加之前.

提前致谢.

我有一个元素列表,当点击每个元素时,我希望我的jQueryUI对话框在单击的列表元素旁边弹出.

$( "#selector" ).dialog({ draggable: false,
              width: 250,
              autoOpen: false,
              position: [e.pageX,e.pageY] });

$(".openDialog").click(function(e){
        console.log('I need the cooridnates x:'+e.pageX+' and y:'+e.pageY+'to be passed to the dialog box');
        $( "#selector" ).dialog("open");
});

我可以得到我需要的坐标,但是我无法将它们传递给对话框init.

希望对此有所了解.

提前致谢!

我正在尝试使用密钥对加密来验证我的应用程序和我的PHP服务器之间的身份.为此,我需要在我的应用程序中生成公钥后将公钥发送到服务器.

if let pubKey = NSData(base64EncodedData: publicKey, options: NSDataBase64DecodingOptions.allZeros)! {
    println(pubKey)
}

publicKey是类型的Unmanaged<SecKey>.

我在上面的代码中得到的错误是: Extra argument 'base64EncodedData' in call

我该怎么做？有没有更好的办法？

编辑:这是密钥对的生成方式:

var publicKeyPtr, privateKeyPtr: Unmanaged<SecKey>?
let parameters = [
    String(kSecAttrKeyType): kSecAttrKeyTypeRSA,
    String(kSecAttrKeySizeInBits): 2048
]
let result = SecKeyGeneratePair(parameters, &publicKeyPtr, &privateKeyPtr)
let publicKey = publicKeyPtr!.takeRetainedValue()
let privateKey = privateKeyPtr!.takeRetainedValue()
let blockSize = SecKeyGetBlockSize(publicKey)

编辑2:所以问题是SecKey不是NSData,所以我的问题应该是:如何将publicKey:SecKey转换为NSData？

我使用SecKeyGeneratePair生成了一个守护者。

        var publicKeyPtr, privateKeyPtr: Unmanaged<SecKey>?

        let publicKeyParameters: [String: AnyObject] = [
            kSecAttrIsPermanent: true,
            kSecAttrApplicationTag: "com.example.site.public"
        ]
        let privateKeyParameters: [String: AnyObject] = [
            kSecAttrIsPermanent: true,
            kSecAttrApplicationTag: "com.example.site.private"
        ]
        let parameters: [String: AnyObject] = [
            kSecAttrKeyType: kSecAttrKeyTypeRSA,
            kSecAttrKeySizeInBits: 2048,
            kSecPublicKeyAttrs.takeUnretainedValue() as String: publicKeyParameters,
            kSecPrivateKeyAttrs.takeUnretainedValue() as String: privateKeyParameters
        ]
        let result = SecKeyGeneratePair(parameters, &publicKeyPtr, &privateKeyPtr)
        let publicKey = publicKeyPtr!.takeRetainedValue()
        let privateKey = privateKeyPtr!.takeRetainedValue()
        let blockSize = SecKeyGetBlockSize(publicKey)

如果我打印出publicKey，我可以看到模数，我很确定这是我所需要的：

publicKey: <SecKeyRef algorithm id: 1, key type: RSAPublicKey, version: 3, block size: 2048 bits, exponent: …