UIActivity可以十分方便地將文字、圖片等內容進行分享，比如分享到微信、微博、發送郵件、短信等等。我們不僅可以分享內容出來，也可以在自己的App里添加自己的分享按鈕或隱藏已有的分享按鈕來實現定制的功能。

下面通過繼承UIActivity實現定制按鈕和功能，通過調用UIActivityViewController來展示分享框。 注意：UIActivityView面板有上下兩行，上面一行是分享按鈕（為彩色）。下面一行是動作按鈕（圖片自動變為黑白）。 下面我們分別在上下各添加一個自定義的功能按鈕（“微信”“航歌”）作為演示。
效果圖如下： ??
--- ViewController.swift ---

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import UIKit class ViewController: UIViewController { ????? ????override func viewDidLoad() { ????????super.viewDidLoad() ????} ????override func didReceiveMemoryWarning() { ????????super.didReceiveMemoryWarning() ????} ????? ????//點擊按鈕彈出分享框 ????@IBAction func btnClicked(sender: AnyObject) { ????????//準備分享內容，文本圖片鏈接 ????????let items = ["航歌", UIImage(named:"toSendImage.png")!, ????????????NSURL(fileURLWithPath:"http://hangge.com")!] ????????//新建自定義的分享對象數組 ????????let acts = [WeiXinActivity(),HanggeActivity()] ????????//根據分享內容和自定義的分享按鈕調用分享視圖 ????????var actView:UIActivityViewController = ????????UIActivityViewController(activityItems: items, applicationActivities: acts)??????? ????????//要排除的分享按鈕，不顯示在分享框里 ????????actView.excludedActivityTypes = [UIActivityTypeMail,UIActivityTypeCopyToPasteboard, ????????????UIActivityTypePrint,UIActivityTypeAssignToContact,UIActivityTypeSaveToCameraRoll] ????????//顯示分享視圖 ????????self.presentViewController(actView, animated:true, completion:nil) ????} }

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--- HanggeActivity.swift ---

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import UIKit class HanggeActivity : UIActivity { ????//用于保存傳遞過來的要分享的數據 ????var text:String! ????var url:NSURL! ????var image:UIImage! ????? ????//顯示在分享框里的名稱 ????override func activityTitle() -> String? { ????????return "航歌" ????} ????? ????//分享框的圖片 ????override func activityImage() -> UIImage? { ????????return UIImage(named:"swift.png") ????} ????? ????//分享類型，在UIActivityViewController.completionHandler回調里可以用于判斷，一般取當前類名 ????override func activityType() -> String? { ????????return HanggeActivity.self.description() ????} ????? ????//按鈕類型（分享按鈕：在第一行，彩色，動作按鈕：在第二行，黑白） ????override class func activityCategory() -> UIActivityCategory{ ????????return UIActivityCategory.Action ????} ????? ????//是否顯示分享按鈕，這里一般根據用戶是否授權,或分享內容是否正確等來決定是否要隱藏分享按鈕 ????override func canPerformWithActivityItems(activityItems: [AnyObject]) -> Bool { ????????for item in activityItems { ????????????if item is UIImage { ????????????????return true ????????????} ????????????if item is String { ????????????????return true ????????????} ????????????if item is NSURL { ????????????????return true ????????????} ????????} ????????return false ????} ????? ????//解析分享數據時調用，可以進行一定的處理 ????override func prepareWithActivityItems(activityItems: [AnyObject]) { ????????println("prepareWithActivityItems") ????????for item in activityItems { ????????????if item is UIImage { ????????????????image = item as! UIImage ????????????} ????????????if item is String { ????????????????text = item as! String ????????????} ????????????if item is NSURL { ????????????????url = item as! NSURL ????????????} ????????} ????} ????? ????//執行分享行為 ????//這里根據自己的應用做相應的處理 ????//例如你可以分享到另外的app例如微信分享，也可以保存數據到照片或其他地方，甚至分享到網絡 ????override func performActivity() { ????????println("performActivity") ????????//具體的執行代碼這邊先省略 ????} ????? ????//分享時調用 ????override func activityViewController() -> UIViewController? { ????????println("activityViewController") ????????return nil ????} ????? ????//完成分享后調用 ????override func activityDidFinish(completed: Bool) { ????????println("activitydidfinish") ????} }

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--- WeiXinActivity.swift ---

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import UIKit class WeiXinActivity : UIActivity { ????//用于保存傳遞過來的要分享的數據 ????var text:String! ????var url:NSURL! ????var image:UIImage! ????? ????//顯示在分享框里的名稱 ????override func activityTitle() -> String? { ????????return "微信" ????} ????? ????//分享框的圖片 ????override func activityImage() -> UIImage? { ????????return UIImage(named:"wechat_session") ????} ????? ????//分享類型，在UIActivityViewController.completionHandler回調里可以用于判斷，一般取當前類名 ????override func activityType() -> String? { ????????return WeiXinActivity.self.description() ????} ????? ????//按鈕類型（分享按鈕：在第一行，彩色，動作按鈕：在第二行，黑白） ????override class func activityCategory() -> UIActivityCategory{ ????????return UIActivityCategory.Share ????} ????? ????//是否顯示分享按鈕，這里一般根據用戶是否授權,或分享內容是否正確等來決定是否要隱藏分享按鈕 ????override func canPerformWithActivityItems(activityItems: [AnyObject]) -> Bool { ????????for item in activityItems { ????????????if item is UIImage { ????????????????return true ????????????} ????????????if item is String { ????????????????return true ????????????} ????????????if item is NSURL { ????????????????return true ????????????} ????????} ????????return false ????} ????? ????//解析分享數據時調用，可以進行一定的處理 ????override func prepareWithActivityItems(activityItems: [AnyObject]) { ????????println("prepareWithActivityItems") ????????for item in activityItems { ????????????if item is UIImage { ????????????????image = item as! UIImage ????????????} ????????????if item is String { ????????????????text = item as! String ????????????} ????????????if item is NSURL { ????????????????url = item as! NSURL ????????????} ????????} ????} ????? ????//執行分享行為 ????//這里根據自己的應用做相應的處理 ????//例如你可以分享到另外的app例如微信分享，也可以保存數據到照片或其他地方，甚至分享到網絡 ????override func performActivity() { ????????println("performActivity") ????????//具體的執行代碼這邊先省略 ????} ????? ????//分享時調用 ????override func activityViewController() -> UIViewController? { ????????println("activityViewController") ????????return nil ????} ????? ????//完成分享后調用 ????override func activityDidFinish(completed: Bool) { ????????println("activitydidfinish") ????} }

轉載于:https://www.cnblogs.com/Free-Thinker/p/4838334.html

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