iOS相机操作笔记
最近忙于项目，需要拍摄图片，这里先列出部分测试代码。
// // FirstViewController.m // UiTest // // Created by Tang Huaming on 16/8/13. // Copyright © 2016年 唐华明. All rights reserved. // #import "FirstViewController.h" #import "SecondViewController.h" // 相机应用需要遵守2个协议 @interface FirstViewController () <UIActionSheetDelegate,UIImagePickerControllerDelegate, UINavigationControllerDelegate> - (IBAction)goToSecondVC:(id)sender; @property (weak, nonatomic) IBOutlet UIImageView *imageView; @property (strong, nonatomic) UIImagePickerController *picker; @property (strong, nonatomic) UIActionSheet *actionSheet; @end @implementation FirstViewController - (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view from its nib. _picker = [[UIImagePickerController alloc] init]; _picker.delegate = self; _picker.allowsEditing = YES; //如果需要对图片进行修改 // UIImagePickerControllerSourceTypeSavedPhotosAlbum //来自相册 // UIImagePickerControllerSourceTypePhotoLibrary //来自图库 // UIImagePickerControllerSourceTypeCamera //来自相机 // 设置源类型之前，需要检查相机是否可用 // if (![self isCameraAvailable]){ // _picker.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum; // }else{ // _picker.sourceType = UIImagePickerControllerSourceTypeCamera; // _picker.showsCameraControls = YES; //显示拍照下方的工具栏 // } } - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated. } /* 字典info中的键 NSString *const UIImagePickerControllerMediaType;指定用户选择的媒体类型 NSString *const UIImagePickerControllerOriginalImage ;原始图片 NSString *const UIImagePickerControllerEditedImage ;修改后的图片 NSString *const UIImagePickerControllerCropRect ;裁剪尺寸 NSString *const UIImagePickerControllerMediaURL ;媒体的URL NSString *const UIImagePickerControllerReferenceURL ;原件的URL NSString *const UIImagePickerControllerMediaMetadata;当来数据来源是照相机的时候这个值才有效 } */ - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info{ NSLog(@"完成照片选择返回------------------>"); UIImage *image = nil; if ([picker allowsEditing]){ // 获取照片的原图 image = [info objectForKey:UIImagePickerControllerEditedImage]; }else{ // 获得编辑后的图片 image = [info objectForKey:UIImagePickerControllerOriginalImage]; } // 显示图片 [_imageView setImage:image]; // 保存图片到相册 SEL selectorToCall = @selector(image:didFinishSavingWithError:contextInfo:); UIImageWriteToSavedPhotosAlbum(image, self, selectorToCall, nil); // Create paths to output images NSString *pngPath = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents/Test.png"]; NSString *jpgPath = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents/Test.jpg"]; NSLog(@"Path: %@", jpgPath); // Write a UIImage to JPEG with minimum compression (best quality) // The value 'image' must be a UIImage object // The value '1.0' represents image compression quality as value from 0.0 to 1.0 // 可以设置压缩率,数值越小，保存的图片占用空间越小 [UIImageJPEGRepresentation(image, 0.3) writeToFile:jpgPath atomically:YES]; // Write image to PNG [UIImagePNGRepresentation(image) writeToFile:pngPath atomically:YES]; // Let's check to see if files were successfully written... // Create file manager NSError *error; NSFileManager *fileMgr = [NSFileManager defaultManager]; // Point to Document directory NSString *documentsDirectory = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents"]; // Write out the contents of home directory to console // 返回文件名称的数组 NSLog(@"Documents directory: %@", [fileMgr contentsOfDirectoryAtPath:documentsDirectory error:&error]); // 关闭 [picker dismissViewControllerAnimated:YES completion:^{ }]; } - (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker{ NSLog(@"取消照片选择返回"); [picker dismissViewControllerAnimated:YES completion:^{ }]; } // 保存图片失败时调用 - (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo: (void *)contextInfo { if (error != nil) { NSLog(@"Image Can not be saved"); } else { NSLog(@"Successfully saved Image"); } } // 相机是否可用 - (BOOL)isCameraAvailable{ return [UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]; } // 图库是否可用 - (BOOL) isPhotoLibraryAvailable{ return [UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary]; } // 相册是否可用 - (BOOL) isPhotoAlbumAvailable{ return [UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeSavedPhotosAlbum]; } // 前面的摄像头是否可用 - (BOOL)isFrontCameraAvailable{ return [UIImagePickerController isCameraDeviceAvailable:UIImagePickerControllerCameraDeviceFront]; } // 后面的摄像头是否可用 - (BOOL)isRearCameraAvailable{ return [UIImagePickerController isCameraDeviceAvailable:UIImagePickerControllerCameraDeviceRear]; } // 判断是否支持某种多媒体类型：拍照，视频 - (BOOL)cameraSupportsMedia:(NSString *)paramMediaType sourceType:(UIImagePickerControllerSourceType)paramSourceType{ __block BOOL result = NO; if ([paramMediaType length] == 0){ NSLog(@"Media type is empty."); return NO; } NSArray *availableMediaTypes =[UIImagePickerController availableMediaTypesForSourceType:paramSourceType]; [availableMediaTypes enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL*stop) { NSString *mediaType = (NSString *)obj; if ([mediaType isEqualToString:paramMediaType]){ result = YES; *stop= YES; } }]; return result; } - (void)callActionSheetFunc{ if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]){ self.actionSheet = [[UIActionSheet alloc] initWithTitle:@"选择图像" delegate:self cancelButtonTitle:@"取消" destructiveButtonTitle:nil otherButtonTitles:@"拍照", @"从相册选择", nil,nil]; }else{ self.actionSheet = [[UIActionSheet alloc] initWithTitle:@"选择图像" delegate:self cancelButtonTitle:@"取消" destructiveButtonTitle:nil otherButtonTitles:@"从相册选择", nil, nil]; } self.actionSheet.tag = 1000; [self.actionSheet showInView:self.view]; } // Called when a button is clicked. The view will be automatically dismissed after this call returns - (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex{ if (actionSheet.tag == 1000) { NSUInteger sourceType = UIImagePickerControllerSourceTypePhotoLibrary; // 判断是否支持相机 if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) { switch (buttonIndex) { case 0: //来源:相机 sourceType = UIImagePickerControllerSourceTypeCamera; break; case 1: //来源:相册 sourceType = UIImagePickerControllerSourceTypePhotoLibrary; break; case 2: return; } } else { if (buttonIndex == 2) { return; } else { sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum; } } // 跳转到相机或相册页面 _picker.sourceType = sourceType; [self presentViewController:_picker animated:YES completion:^{ }]; } } - (IBAction)goToSecondVC:(id)sender { [self callActionSheetFunc]; } @end
