Swift詳解UIImagePickerController調用相簿相機功能，uiimagepicker

Swift詳解UIImagePickerController調用相簿相機功能，uiimagepicker

　　首先，添加UINavigationControllerDelegate和UIImagePickerControllerDelegate兩項protocol.
　　使用UIImagePickerController，就必須實現UINavigationControllerDelegate這個protocol，因為調用過程中會出現NavigationBar,如果沒實現，也不會說運行不了。只是Xcode會直接就給你一個warning.

　　直接上自己用swift寫的一個設定頭像的小demo，可直接複製使用。注釋清晰明了。

　　

  1 //  2 //  ViewController.swift  3 //  ImageDemo  4 //  5 //  Created by fanviwa on 15/4/22.  6 //  Copyright (c) 2015年 fanviwa. All rights reserved.  7 //  8   9 import UIKit 10  11 class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate { 12      13     @IBOutlet weak var imageView: UIImageView! 14      // 初始化圖片選擇控制器 15     let imagePickerController: UIImagePickerController = UIImagePickerController() 16     var isFullScreen: Bool = false 17      18     override func viewDidLoad() { 19         super.viewDidLoad() 20         // Do any additional setup after loading the view, typically from a nib. 21         self.imageView.frame = CGRectMake(100, 100, 128, 128) 22     } 23  24     override func didReceiveMemoryWarning() { 25         super.didReceiveMemoryWarning() 26         // Dispose of any resources that can be recreated. 27     } 28  29     @IBAction func chooseImage(sender: UIButton) { 30         // 設定代理 31         self.imagePickerController.delegate = self 32         // 設定是否可以管理已經存在的圖片或者視頻 33         self.imagePickerController.allowsEditing = true 34  35         // 判斷是否支援相機 36         if(UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.Camera)){ 37             let alertController: UIAlertController = UIAlertController(title: nil, message: nil, preferredStyle: UIAlertControllerStyle.ActionSheet) 38             //在iPad上使用表單（ActionSheet）需要設定描點(anchor point) 39             var popover = alertController.popoverPresentationController 40             if (popover != nil){ 41                 popover?.sourceView = sender 42                 popover?.sourceRect = sender.bounds 43                 popover?.permittedArrowDirections = UIPopoverArrowDirection.Any 44             } 45              46             let cameraAction: UIAlertAction = UIAlertAction(title: "拍照換頭像", style: .Default) { (action: UIAlertAction!) -> Void in 47                 // 設定類型 48                 self.imagePickerController.sourceType = UIImagePickerControllerSourceType.Camera 49                 self.presentViewController(self.imagePickerController, animated: true, completion: nil) 50             } 51             alertController.addAction(cameraAction) 52              53             let photoLibraryAction: UIAlertAction = UIAlertAction(title: "從相簿選擇換頭像", style: .Default) { (action: UIAlertAction!) -> Void in 54                 // 設定類型 55                 self.imagePickerController.sourceType = UIImagePickerControllerSourceType.PhotoLibrary 56                 //改navigationBar背景色 57                 self.imagePickerController.navigationBar.barTintColor = UIColor(red: 171/255, green: 202/255, blue: 41/255, alpha: 1.0) 58                 //改navigationBar標題色 59                 self.imagePickerController.navigationBar.titleTextAttributes = [NSForegroundColorAttributeName: UIColor.whiteColor()] 60                 //改navigationBar的button字型色 61                 self.imagePickerController.navigationBar.tintColor = UIColor.whiteColor() 62                 self.presentViewController(self.imagePickerController, animated: true, completion: nil) 63             } 64             alertController.addAction(photoLibraryAction) 65              66             let cancelAction: UIAlertAction = UIAlertAction(title: "取消", style: .Cancel, handler: nil) 67             alertController.addAction(cancelAction) 68              69             presentViewController(alertController, animated: true, completion: nil) 70              71         }else{ 72             let alertController: UIAlertController = UIAlertController(title: nil, message: nil, preferredStyle: UIAlertControllerStyle.ActionSheet) 73             //設定描點(anchor point) 74             var popover = alertController.popoverPresentationController 75             if (popover != nil){ 76                 popover?.sourceView = sender 77                 popover?.sourceRect = sender.bounds 78                 popover?.permittedArrowDirections = UIPopoverArrowDirection.Any 79             } 80              81             let photoLibraryAction: UIAlertAction = UIAlertAction(title: "從相簿選擇換頭像", style: .Default) { (action: UIAlertAction!) -> Void in 82                 // 設定類型 83                 self.imagePickerController.sourceType = UIImagePickerControllerSourceType.PhotoLibrary 84                 //改navigationBar背景色 85                 self.imagePickerController.navigationBar.barTintColor = UIColor(red: 171/255, green: 202/255, blue: 41/255, alpha: 1.0) 86                 //改navigationBar標題色 87                 self.imagePickerController.navigationBar.titleTextAttributes = [NSForegroundColorAttributeName: UIColor.whiteColor()] 88                 //改navigationBar的button字型色 89                 self.imagePickerController.navigationBar.tintColor = UIColor.whiteColor() 90                 self.presentViewController(self.imagePickerController, animated: true, completion: nil) 91             } 92             alertController.addAction(photoLibraryAction) 93              94             let cancelAction: UIAlertAction = UIAlertAction(title: "取消", style: .Cancel, handler: nil) 95             alertController.addAction(cancelAction) 96              97             presentViewController(alertController, animated: true, completion: nil) 98         } 99     }100 101     //實現ImagePicker delegate 事件102     func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [NSObject : AnyObject]) {103         picker.dismissViewControllerAnimated(true, completion: nil)104         var image: UIImage!105         // 判斷，圖片是否允許修改106         if(picker.allowsEditing){107             //裁剪後圖片108             image = info[UIImagePickerControllerEditedImage] as! UIImage109         }else{110             //原始圖片111             image = info[UIImagePickerControllerOriginalImage] as! UIImage112         }113         /* 此處info 有六個值114         * UIImagePickerControllerMediaType; // an NSString UTTypeImage)115         * UIImagePickerControllerOriginalImage;  // a UIImage 原始圖片116         * UIImagePickerControllerEditedImage;    // a UIImage 裁剪後圖片117         * UIImagePickerControllerCropRect;       // an NSValue (CGRect)118         * UIImagePickerControllerMediaURL;       // an NSURL119         * UIImagePickerControllerReferenceURL    // an NSURL that references an asset in the AssetsLibrary framework120         * UIImagePickerControllerMediaMetadata    // an NSDictionary containing metadata from a captured photo121         */122         // 儲存圖片至本地，方法見下文123         self.saveImage(image, newSize: CGSize(width: 256, height: 256), percent: 0.5, imageName: "currentImage.png")124         let fullPath: String = NSHomeDirectory().stringByAppendingPathComponent("Documents").stringByAppendingPathComponent("currentImage.png")125         println("fullPath=\(fullPath)")126         let savedImage: UIImage = UIImage(contentsOfFile: fullPath)!127         self.isFullScreen = false128         self.imageView.image = savedImage129         //在這裡調用網路通訊方法，上傳頭像至伺服器...130     }131     // 當使用者取消時，調用該方法132     func imagePickerControllerDidCancel(picker: UIImagePickerController) {133         self.dismissViewControllerAnimated(true, completion: nil)134     }135     136     //儲存圖片至沙箱137     func saveImage(currentImage: UIImage, newSize: CGSize, percent: CGFloat, imageName: String){138         //壓縮圖片尺寸139         UIGraphicsBeginImageContext(newSize)140         currentImage.drawInRect(CGRect(x: 0, y: 0, width: newSize.width, height: newSize.height))141         let newImage: UIImage = UIGraphicsGetImageFromCurrentImageContext()142         UIGraphicsEndImageContext()143         //高保真壓縮圖片品質144         //UIImageJPEGRepresentation此方法可將圖片壓縮，但是圖片品質基本不變，第二個參數即圖片品質參數。145         let imageData: NSData = UIImageJPEGRepresentation(newImage, percent)146         // 擷取沙箱目錄,這裡將圖片放在沙箱的documents檔案夾中147         let fullPath: String = NSHomeDirectory().stringByAppendingPathComponent("Documents").stringByAppendingPathComponent(imageName)148         // 將圖片寫入檔案149         imageData.writeToFile(fullPath, atomically: false)150     }151     152     //實現點擊圖片預覽功能，滑動放大縮小，帶動畫153     override func touchesBegan(touches: Set<NSObject>, withEvent event: UIEvent) {154         self.isFullScreen = !self.isFullScreen155         156         let touch: UITouch = touches.first as! UITouch157         let touchPoint: CGPoint  = touch.locationInView(self.view)158         let imagePoint: CGPoint = self.imageView.frame.origin159         //touchPoint.x ，touchPoint.y 就是觸點的座標160         // 觸點在imageView內，點擊imageView時 放大,再次點擊時縮小161         if(imagePoint.x <= touchPoint.x && imagePoint.x + self.imageView.frame.size.width >= touchPoint.x && imagePoint.y <=  touchPoint.y && imagePoint.y+self.imageView.frame.size.height >= touchPoint.y){162             // 設定圖片放大動畫163             UIView.beginAnimations(nil, context: nil)164             // 動畫時間165             UIView.setAnimationDuration(1)166             167             if (isFullScreen) {168                 // 放大尺寸169                 self.imageView.frame = CGRectMake(0, 0, 480, 320)170             }171             else {172                 // 縮小尺寸173                 self.imageView.frame = CGRectMake(100, 100, 128, 128)174             }175             // commit動畫176             UIView.commitAnimations()177         }178     }179 }

其次，還有一些檢查是否有硬體的方法。

1 // 判斷裝置是否有網路攝影機2     UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.Camera)3     // 前面的網路攝影機是否可用4     UIImagePickerController.isCameraDeviceAvailable(UIImagePickerControllerCameraDevice.Front)5     // 後面的網路攝影機是否可用6     UIImagePickerController.isCameraDeviceAvailable(UIImagePickerControllerCameraDevice.Rear)7     // 相簿是否可用8     UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.PhotoLibrary)

當然，想要修改相簿頁面為中文還的在Info.plist設定檔中添加"Localized resources can be mixed"屬性並設定為YES。

注意：iOS8.0後提示“

Snapshotting a view that has not been rendered results in an empty snapshot. Ensure your view has been rendered at least once before snapshotting or snapshot after screen updates.

”是正常的，暫無解決辦法。

希望對你有協助！