UIActivityViewController的使用(Swift实现)

UIActivityViewController可以用于一些标准服务，例如国内的微博分享，发送邮件，发送短信，保存图片等。

UIActivityViewController类中只有三个方法

init(activityItems: [AnyObject], applicationActivities: [AnyObject]?) //初始化方法<pre name="code" class="objc">

var completionHandler: UIActivityViewControllerCompletionHandler?     //结束后执行的blockvar excludedActivityTypes: [AnyObject]?//排除的Activity

利用默认的UIActivity去对一个图片，一个URL，一个字符串进行操作。

        //屏幕截图得到一个图片        UIGraphicsBeginImageContext(self.view.bounds.size)        self.view.layer.renderInContext(UIGraphicsGetCurrentContext())        let image = UIGraphicsGetImageFromCurrentImageContext()        UIGraphicsEndImageContext()                //一个字符串        let shareString = "share text"        //一个URL        let shareURL = NSURL(string: "http://www.baidu.com")        //初始化一个UIActivity        var activity = UIActivity()                let activityItems = [image, shareString, shareURL]        let activities = [activity]        //初始化UIActivityViewController        let activityController = UIActivityViewController(activityItems: activityItems, applicationActivities: activities)        //排除一些服务：例如复制到粘贴板，拷贝到通讯录        activityController.excludedActivityTypes = [UIActivityTypeCopyToPasteboard,UIActivityTypeAssignToContact]        //iphone中为模式跳转        self.presentViewController(activityController, animated: true) { () -> Void in        }                //结束后执行的Block，可以查看是那个类型执行，和是否已经完成        var activityType:String?        var error:NSError?        activityController.completionHandler = { activityType, error in            println("\(activityType)")            println("\(error.description)")        }

利用自定义的UIActivity在百度搜歌手的歌曲---例如搜Beyond

首先需要自定义UIActivity，并重写方法

class MuSicSearchActivity: UIActivity {    var searchStr:NSString = ""        //定义这个Activity的类型，有Action和Share，默认是Action。    override class func activityCategory() -> UIActivityCategory {        return .Action    }        //这个是显示的标题，默认返回nil    override func activityTitle() -> String? {        return "搜索歌手"    }        //这个是显示的图片，默认返回nil    override func activityImage() -> UIImage? {        return UIImage(named: "search")    }        //是否能够执行相应的类型,此处如果是String就能执行    override func canPerformWithActivityItems(activityItems: [AnyObject]) -> Bool {        let count:Int = activityItems.count        for index in 0...count-1 {            var object: AnyObject = activityItems[index]            if  object.isKindOfClass(NSString.self) {                return true            }        }        return false    }        //执行操作的准备工作    override func prepareWithActivityItems(activityItems: [AnyObject]) {        let count:Int = activityItems.count        for index in 0...count-1 {            var object: AnyObject = activityItems[index]            if  object.isKindOfClass(NSString.self) {                searchStr = object as NSString                return;            }        }    }        //在新的Controllerz中显示    override func activityViewController() -> UIViewController? {        let url = NSURL(string:"http://music.baidu.com/search?key=\(searchStr)")        let request = NSURLRequest(URL: url!)                let storyboard = UIStoryboard(name:"Main", bundle:nil)        let webView = storyboard.instantiateViewControllerWithIdentifier("WebViewController") as WebViewController        webView.request = request        println("webViewController = \(webView)")        return webView    }        //完成后调用这个方法把ActivityController去掉    func back() {        activityDidFinish(true)    }}

初始化ActivityController

        //一个字符串        let shareString = "Beyond"                let activityItems:Array = [shareString]                var activity = MuSicSearchActivity()        let activities = [activity]                //初始化UIActivityViewController        let activityController = UIActivityViewController(activityItems: activityItems, applicationActivities: activities)        //排除其他服务        activityController.excludedActivityTypes = [UIActivityTypeCopyToPasteboard,UIActivityTypeAssignToContact,UIActivityTypeMail]        //iphone中为模式跳转        self.presentViewController(activityController, animated: true) { () -> Void in        }

点击后的结果：