UIImagePickerController

UIImagePickerController主要用来选择图片，或是拍照，或是录像。其中图片选择时，既可以从相册选择，也可以从图库选择。

但不管是选择图片，还是拍照，还是录像都是通过设置属性"sourceType"来实现的。

// 注意添加相关framework头文件  
// 使用相机设备（AVCaptureDevice）功能时  
import Photos  
// 使用图片库功能  
import AssetsLibrary  
// 使用录制视频功能  
import MobileCoreServices  

// MARK: 图库  
func photosShow()  
{  
        // 是否支持图片库  
        if UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.SavedPhotosAlbum)  
        {  
            if self.photosPicker == nil  
            {  
                // 实例化  
                self.photosPicker = UIImagePickerController()  
                // 图库类型  
                self.photosPicker.sourceType = UIImagePickerControllerSourceType.SavedPhotosAlbum  
                // 代理对象（注意添加协议 UIImagePickerControllerDelegate、UINavigationControllerDelegate，及实现代理方法）  
                self.photosPicker.delegate = self  
                // 设置图片可编辑  
                self.photosPicker.allowsEditing = true  
                // 改navigationBar背景色  
                self.photosPicker.navigationBar.barTintColor = UIColor.greenColor()  
                // 改navigationBar标题色  
                self.photosPicker.navigationBar.titleTextAttributes = [NSForegroundColorAttributeName: UIColor.redColor()]  
                // 改navigationBar的button字体色  
                self.photosPicker.navigationBar.tintColor = UIColor.blueColor()  
            }  
            // 弹出图库视图控制器  
            self.presentViewController(self.photosPicker, animated: true, completion: nil)  
        }  
        else  
        {  
            print("读取图库失败")  
        }  
}  

// MARK: 相册  
func imageShow()  
{  
        // 是否支持相册  
        if UIImagePickerController.isValidImagePickerType(type: UIImagePickerType.UIImagePickerTypePhotoLibrary)  
        {  
            if self.imagePicker == nil  
            {  
                self.imagePicker = UIImagePickerController()  
                self.imagePicker.sourceType = UIImagePickerControllerSourceType.PhotoLibrary  
                self.imagePicker.delegate = self  
                self.imagePicker.setImagePickerStyle(UIColor.brownColor(), titleColor: UIColor.greenColor(), buttonTitleColor: UIColor.yellowColor())  
            }  
            // 弹出图库视图控制器  
            self.presentViewController(self.imagePicker, animated: true, completion: nil)  
        }  
        else  
        {  
            print("读取相册失败")  
        }  
}  

// MARK: UIImagePickerControllerDelegate, UINavigationControllerDelegate  
func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) {  
        print("1 图片选择：\(info)")  

        // 相册、图库  
        if picker.isEqual(self.imagePicker) || picker.isEqual(self.photosPicker)  
        {  
            // 选择的图片参数  
            /*  
            指定用户选择的媒体类型 UIImagePickerControllerMediaType  
            原始图片 UIImagePickerControllerOriginalImage  
            修改后的图片 UIImagePickerControllerEditedImage  
            裁剪尺寸 UIImagePickerControllerCropRect  
            媒体的URL UIImagePickerControllerMediaURL  
            原件的URL UIImagePickerControllerReferenceURL  
            当来数据来源是照相机的时候这个值才有效 UIImagePickerControllerMediaMetadata  
            */  

            // 获取选择的原图  
            let pickedImage = info[UIImagePickerControllerOriginalImage] as! UIImage  
            print(pickedImage)  

            // 获取选择的图片引用路径（注意：添加类 import Photos）  
            let pickedURL:NSURL = info[UIImagePickerControllerReferenceURL] as! NSURL  
            let fetchResult:PHFetchResult = PHAsset.fetchAssetsWithALAssetURLs([pickedURL], options: nil)  
            let asset:PHAsset = fetchResult.firstObject as! PHAsset  
            PHImageManager.defaultManager().requestImageDataForAsset(asset, options: nil, resultHandler: {  
                    (imageData: NSData?, dataUTI: String?, orientation: UIImageOrientation,  
                    info: [NSObject : AnyObject]?) in  
                    //获取实际路径  
                    let imageNSURL: NSURL = info!["PHImageFileURLKey"] as! NSURL  
                    print("路径：",imageNSURL)  
                    print("文件名：",imageNSURL.lastPathComponent)  
                })  

            // 显示图片  
            self.imageview.image = pickedImage  

            // 图片保存到相册  
            // UIImageWriteToSavedPhotosAlbum(pickedImage, self, Selector("imageSave:error:contextInfo:"), nil)  
        }  

        // 退出图片选择控制器  
        picker.dismissViewControllerAnimated(true, completion: nil)  
}  

func imagePickerControllerDidCancel(picker: UIImagePickerController) {  
        print("2 放弃图片选择")  

        // 退出图片选择控制器  
        picker.dismissViewControllerAnimated(true, completion: nil)  
}  

// 扩展类方法  

import Foundation  
import UIKit  
import Photos  

/// 相片选择器类型：相册 PhotoLibrary，图库 SavedPhotosAlbum，相机 Camera，前置摄像头 Front，后置摄像头 Rear  
public enum UIImagePickerType:Int  
{  
    /// 相册 PhotoLibrary  
    case UIImagePickerTypePhotoLibrary = 1  

    /// 图库 SavedPhotosAlbum  
    case UIImagePickerTypeSavedPhotosAlbum = 2  

    /// 相机 Camera  
    case UIImagePickerTypeCamera = 3  

    /// 前置摄像头 Front  
    case UIImagePickerTypeCameraFront = 4  

    /// 后置摄像头 Rear  
    case UIImagePickerTypeCameraRear = 5  
}  

extension UIImagePickerController  
{      
    // MARK: - 设备使用有效性判断  
    // 相册 PhotoLibrary，图库 SavedPhotosAlbum，相机 Camera，前置摄像头 Front，后置摄像头 Rear  
    public class func isValidImagePickerType(type imagePickerType:UIImagePickerType) -> Bool  
    {  
        switch imagePickerType  
        {  
        case .UIImagePickerTypePhotoLibrary:  
            if self.isValidPhotoLibrary  
            {  
                return true  
            }  
            return false  

            break  

        case .UIImagePickerTypeSavedPhotosAlbum:  
            if self.isValidSavedPhotosAlbum  
            {  
                return true  
            }  
            return false  

            break  

        case .UIImagePickerTypeCamera:  
            if self.isValidCameraEnable && self.isValidCamera  
            {  
                return true  
            }  
            return false  

            break  

        case .UIImagePickerTypeCameraFront:  
            if self.isValidCameraEnable && self.isValidCameraFront  
            {  
                return true  
            }  
            return false  

            break  

        case .UIImagePickerTypeCameraRear:  
            if self.isValidCamera && self.isValidCameraRear  
            {  
                return true  
            }  
            return false  

            break  

        default: return false  
        }  
    }  

    /// 相机设备是否启用  
    public class var isValidCameraEnable:Bool  
    {  
        get  
        {  
            let cameraStatus = AVCaptureDevice.authorizationStatusForMediaType(AVMediaTypeAudio)  
            if cameraStatus == AVAuthorizationStatus.Denied  
            {  
                return false  
            }  

            return true  
        }  
    }  

    /// 相机Camera是否可用（是否有摄像头）  
    public class var isValidCamera:Bool  
    {  
        get  
        {  
            if UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.Camera)  
            {  
                return true  
            }  

            return false  
        }  
    }  

    /// 前置相机是否可用  
    public class var isValidCameraFront:Bool  
    {  
        get  
        {  
            if UIImagePickerController.isCameraDeviceAvailable(UIImagePickerControllerCameraDevice.Front)  
            {  
                return true  
            }  

            return false  
        }  
    }  

    /// 后置相机是否可用  
    public class var isValidCameraRear:Bool  
    {  
        get  
        {  
            if UIImagePickerController.isCameraDeviceAvailable(UIImagePickerControllerCameraDevice.Rear)  
            {  
                return true  
            }  

            return false  
        }  
    }  

    /// 相册PhotoLibrary是否可用  
    public class var isValidPhotoLibrary:Bool  
    {  
        get  
        {  
            if UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.PhotoLibrary)  
            {  
                return true  
            }  

            return false  
        }  
    }  

    /// 图库SavedPhotosAlbum是否可用  
    public class var isValidSavedPhotosAlbum:Bool  
    {  
        get  
        {  
            if UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.SavedPhotosAlbum)  
            {  
                return true  
            }  

            return false  
        }  
    }  


    // MARK: - 属性设置  
    func setImagePickerStyle(bgroundColor:UIColor, titleColor:UIColor, buttonTitleColor:UIColor)  
    {  
        // 改navigationBar背景色  
        if let bgroundColorTmp:UIColor = bgroundColor  
        {  
            self.navigationBar.barTintColor = bgroundColorTmp  
        }  

        // 改navigationBar标题色  
        if let titleColorTmp:UIColor = titleColor  
        {  
            self.navigationBar.titleTextAttributes = [NSForegroundColorAttributeName: titleColorTmp]  
        }  

        // 改navigationBar的button字体色  
        if let buttonTitleColorTmp:UIColor = buttonTitleColor  
        {  
            self.navigationBar.tintColor = buttonTitleColorTmp  
        }  
    }  
}

需要注意：在使用过程中可能会出现UIImagePickerController的标题和按钮的字体为英文，可以通过修改配置信息实现中文显示。

1、添加中文语言包

2、修改手机或模拟器的语言

3、info.plist配置修改