首先,添加UINavigationControllerDelegate和UIImagePickerControllerDelegate两项protocol.
使用UIImagePickerController,就必须实现UINavigationControllerDelegate这个protocol,因为调用过程中会出现NavigationBar,如果没实现,也不会说运行不了。只是Xcode会直接就给你一个warning.
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直接上自己用swift写的一个设置头像的小demo,可直接复制使用。注释清晰明了。
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 // 初始化图片选择控制器 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 // 设置代理 31 self.imagePickerController.delegate = self 32 // 设置是否可以管理已经存在的图片或者视频 33 self.imagePickerController.allowsEditing = true 34 35 // 判断是否支持相机 36 if(UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.Camera)){ 37 let alertController: UIAlertController = UIAlertController(title: nil, message: nil, preferredStyle: UIAlertControllerStyle.ActionSheet) 38 //在iPad上使用表单(ActionSheet)需要设置描点(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: "拍照换头像", style: .Default) { (action: UIAlertAction!) -> Void in 47 // 设置类型 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: "从相册选择换头像", style: .Default) { (action: UIAlertAction!) -> Void in 54 // 设置类型 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标题色 59 self.imagePickerController.navigationBar.titleTextAttributes = [NSForegroundColorAttributeName: UIColor.whiteColor()] 60 //改navigationBar的button字体色 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 //设置描点(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: "从相册选择换头像", style: .Default) { (action: UIAlertAction!) -> Void in 82 // 设置类型 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标题色 87 self.imagePickerController.navigationBar.titleTextAttributes = [NSForegroundColorAttributeName: UIColor.whiteColor()] 88 //改navigationBar的button字体色 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 //实现ImagePicker delegate 事件102 func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [NSObject : AnyObject]) {103 picker.dismissViewControllerAnimated(true, completion: nil)104 var image: UIImage!105 // 判断,图片是否允许修改106 if(picker.allowsEditing){107 //裁剪后图片108 image = info[UIImagePickerControllerEditedImage] as! UIImage109 }else{110 //原始图片111 image = info[UIImagePickerControllerOriginalImage] as! UIImage112 }113 /* 此处info 有六个值114 * UIImagePickerControllerMediaType; // an NSString UTTypeImage)115 * UIImagePickerControllerOriginalImage; // a UIImage 原始图片116 * UIImagePickerControllerEditedImage; // a UIImage 裁剪后图片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 // 保存图片至本地,方法见下文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 //在这里调用网络通讯方法,上传头像至服务器...130 }131 // 当用户取消时,调用该方法132 func imagePickerControllerDidCancel(picker: UIImagePickerController) {133 self.dismissViewControllerAnimated(true, completion: nil)134 }135 136 //保存图片至沙盒137 func saveImage(currentImage: UIImage, newSize: CGSize, percent: CGFloat, imageName: String){138 //压缩图片尺寸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 //高保真压缩图片质量144 //UIImageJPEGRepresentation此方法可将图片压缩,但是图片质量基本不变,第二个参数即图片质量参数。145 let imageData: NSData = UIImageJPEGRepresentation(newImage, percent)146 // 获取沙盒目录,这里将图片放在沙盒的documents文件夹中147 let fullPath: String = NSHomeDirectory().stringByAppendingPathComponent("Documents").stringByAppendingPathComponent(imageName)148 // 将图片写入文件149 imageData.writeToFile(fullPath, atomically: false)150 }151 152 //实现点击图片预览功能,滑动放大缩小,带动画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 就是触点的坐标160 // 触点在imageView内,点击imageView时 放大,再次点击时缩小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 // 设置图片放大动画163 UIView.beginAnimations(nil, context: nil)164 // 动画时间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 // 缩小尺寸173 self.imageView.frame = CGRectMake(100, 100, 128, 128)174 }175 // commit动画176 UIView.commitAnimations()177 }178 }179 }
其次,还有一些检查是否有硬件的方法。
1 // 判断设备是否有摄像头2 UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.Camera)3 // 前面的摄像头是否可用4 UIImagePickerController.isCameraDeviceAvailable(UIImagePickerControllerCameraDevice.Front)5 // 后面的摄像头是否可用6 UIImagePickerController.isCameraDeviceAvailable(UIImagePickerControllerCameraDevice.Rear)7 // 相册是否可用8 UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.PhotoLibrary)
当然,想要修改相册页面为中文还的在Info.plist配置文件中添加"Localized resources can be mixed"属性并设置为YES。
注意:iOS8.0后提示“
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,暂无解决办法。
希望对你有帮助!
原标题:Swift详解UIImagePickerController调用相册相机功能
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