UIActivityViewController

最新推荐文章于 2025-06-04 12:28:38 发布

原创最新推荐文章于 2025-06-04 12:28:38 发布 · 635 阅读

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CC 4.0 BY-SA版权

本文将指导您如何在iOS应用中实现基本的分享功能，通过使用`UIActivityViewController`，简化了用户分享文本的过程。

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实现简单的分享功能

import UIKit

class ViewController: UIViewController, UITextFieldDelegate {
  
  var textField:UITextField!
  var buttonShare:UIButton!
  var activityViewController:UIActivityViewController!
  
  func handleShare(sender: UIButton){
    
    guard let textFieldText = textField.text where
    textFieldText.stringByTrimmingCharactersInSet(NSCharacterSet.whitespaceCharacterSet()).characters.count > 0 else{
      let message = "Please enter a text and then press Share"
      
      let alertController = UIAlertController(title: nil,
        message: message,
        preferredStyle: .Alert)
      
      alertController.addAction(
        UIAlertAction(title: "OK", style: .Default, handler: nil))
      
      presentViewController(alertController, animated: true, completion: nil)
      
      return
    }
    
    
    
    /* it is VERY important to cast your strings to NSString
    otherwise the controller cannot display the appropriate sharing options */
    activityViewController = UIActivityViewController(
      activityItems: [NSString(string: textFieldText)],
      applicationActivities: nil)
    
    presentViewController(activityViewController,
      animated: true,
      completion: {
      })
  }
  
  func textFieldShouldReturn(textField: UITextField) -> Bool{
    textField.resignFirstResponder()
    return true
  }
  
  func createTextField(){
    textField = UITextField(frame:
      CGRect(x: 20, y: 35, width: 280, height: 30))
    textField.borderStyle = .RoundedRect;
    textField.placeholder = "Enter text to share..."
    textField.delegate = self
    view.addSubview(textField)
  }
  
  func createButton(){
    buttonShare = UIButton(type: .System)
    buttonShare.frame = CGRect(x: 20, y: 80, width: 280, height: 44)
    buttonShare.setTitle("Share", forState:.Normal)
    
    buttonShare.addTarget(self,
      action:"handleShare:",
      forControlEvents:.TouchUpInside)
    
    view.addSubview(buttonShare)
  }
  
  override func viewDidLoad() {
    super.viewDidLoad()
    createTextField()
    createButton()
  }
  
}

效果如下：