UIImagePickerController——–图片选取器

@UIImagePickerController 类是获取选择图片和视频的用户接口。我们可以用这个controller选择我们所需要的图片和视频。对于这个类来说比较特殊，我们不能够任意定制，也不可以继承生成子类。 1.当前设备是否支持使用UIImagePickerController，需要调用 [UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]; 2.查看符合的媒体类型（图片或者视频,调用availableMediaTypesForSourceType: 方法判断。 3.sourceType(从哪选取媒体) // 打开图片库根目录选择 UIImagePickerControllerSourceTypePhotoLibrary // 使用相机选择 UIImagePickerControllerSourceTypeCamera // 打开SavedPhoto目录选择 UIImagePickerControllerSourceTypeSavedPhotosAlbum 4.先创建一个UIImagePickerController(可以用模态推出相册或UIActionSheet推出) ~~~ @实现协议UIImagePickerControllerDelegate _imagePickerC = [[UIImagePickerController alloc] init]; _imagePickerC.sourceType = UIImagePickerControllerSourceTypePhotoLibrary; _imagePickerC.allowsEditing = YES; _imagePickerC.delegate = self; [self presentModalViewController: _imagePickerC animated: YES]; ~~~ allowEditing 设置为YES，表示允许用户编辑图片，否则，不允许用户编辑。 5.两个主要的委托方法 ~~~ // 用户选中图片之后的回调 - (void)imagePickerController: (UIImagePickerController *)picker didFinishPickingMediaWithInfo: (NSDictionary *)info { if (picker == picker_camera_) { //如果是来自照相机的image，那么先保存 UIImage* original_image = [info objectForKey:@"UIImagePickerControllerOriginalImage"]; } // info dictionary keys UIKIT_EXTERN NSString *const UIImagePickerControllerMediaType; // an NSString (UTI, i.e. kUTTypeImage) UIKIT_EXTERN NSString *const UIImagePickerControllerOriginalImage; // a UIImage UIKIT_EXTERN NSString *const UIImagePickerControllerEditedImage; // a UIImage UIKIT_EXTERN NSString *const UIImagePickerControllerCropRect; // an NSValue (CGRect) UIKIT_EXTERN NSString *const UIImagePickerControllerMediaURL; // an NSURL UIKIT_EXTERN NSString *const UIImagePickerControllerReferenceURL NS_AVAILABLE_IOS(4_1); // an NSURL that references an asset in the AssetsLibrary framework UIKIT_EXTERN NSString *const UIImagePickerControllerMediaMetadata NS_AVAILABLE_IOS(4_1); // an NSDictionary containing metadata from a captured photo // 获得编辑过的图片 UIImage* image = [info objectForKey: @"UIImagePickerControllerEditedImage"]; // 把图片转成NSData类型的数据来保存文件(存入到沙盒中) NSData *imageData; // 判断图片是不是png格式的文件 if (UIImagePNGRepresentation(image)) { // 返回为png图像。 imageData = UIImagePNGRepresentation(image); }else { // 返回为JPEG图像 imageData = UIImageJPEGRepresentation(image, 1.0); } // 路径拼接,写入----- NSString * imageSavePath = [[[HMTMySqliteDataHandle shareInstance]saveImagesPath] stringByAppendingPathComponent:@"自定义.自定义"]; [imageData writeToFile:imageSavePath atomically:YES]; // 关闭相册界面 [self dismissModalViewControllerAnimated:YES]; [picker release]; } // 用户选择取消 - (void) imagePickerControllerDidCancel: (UIImagePickerController *)picker { // 关闭相册界面 [self dismissModalViewControllerAnimated:YES]; [picker release]; } ~~~ @[ UIImagePickerController详解](http://blog.csdn.net/kingsley_cxz/article/details/9157093) @ [UIImagePickerController](http://blog.csdn.net/rhljiayou/article/details/8003939) 任海丽(3G移动/开发) @[iOS摄像头和相册-UIImagePickerController-浅析](http://blog.sina.com.cn/s/blog_7b9d64af0101cfd9.html)