ios 照相机和相册的调用

一个简单的功能,上传照片或者拍照可以用到.

//首先遵循两个代理 <UIImagePickerControllerDelegate,UINavigationControllerDelegate> //我们创建一个btn和一个imageview,btn用来触发事件调起照相机和相册的功能,imageview用来展示选取或者拍摄的图片. self.view.backgroundColor = [UIColor whiteColor]; UIButton *btn = [[UIButton alloc]initWithFrame:CGRectMake(100 , 100, 200,50)]; btn.backgroundColor = [UIColor blackColor]; [btn setTitle:@'ChoosePhoto' forState:UIControlStateNormal]; [btn addTarget:self action:@selector(btnClick:) forControlEvents:UIControlEventTouchUpInside]; [self.view addSubview:btn]; _imageview = [[UIImageView alloc]initWithFrame:CGRectMake(200, 200, 100, 100)]; _imageview.backgroundColor = [UIColor lightGrayColor]; _imageview.layer.cornerRadius = CGRectGetHeight(_imageview.bounds)/2; _imageview.clipsToBounds = YES; [self.view addSubview:_imageview]; //btn的点击事件 - (void)btnClick:(UIButton *)btn{ //创建UIAlertController是为了让用户去选择照片来源,拍照或者相册. UIAlertController *alertController = [UIAlertController alertControllerWithTitle:nil message:nil preferredStyle:0]; UIImagePickerController *imagePickerController = [[UIImagePickerController alloc] init]; imagePickerController.delegate = self; imagePickerController.allowsEditing = YES; UIAlertAction *okAction = [UIAlertAction actionWithTitle:@'从相册选取' style:(UIAlertActionStyleDefault) handler:^(UIAlertAction *action) {imagePickerController.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;[self presentViewController:imagePickerController animated:YES completion:^{}]; }]; UIAlertAction *photoAction = [UIAlertAction actionWithTitle:@'拍照' style:(UIAlertActionStyleDefault) handler:^(UIAlertAction *action) {imagePickerController.sourceType = UIImagePickerControllerSourceTypeCamera;[self presentViewController:imagePickerController animated:YES completion:^{}]; }]; UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@'取消' style:(UIAlertActionStyleCancel) handler:^(UIAlertAction *action) { //这里可以不写代码 }]; [self presentViewController:alertController animated:YES completion:nil]; //用来判断来源 Xcode中的模拟器是没有拍摄功能的,当用模拟器的时候我们不需要把拍照功能加速 if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {[alertController addAction:okAction];[alertController addAction:cancelAction];[alertController addAction:photoAction]; } else {[alertController addAction:okAction];[alertController addAction:cancelAction]; }} //这个是选取完照片后要执行的代理方法 - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info{ [picker dismissViewControllerAnimated:YES completion:^{}]; //选取裁剪后的图片 UIImage *image = [info objectForKey:UIImagePickerControllerEditedImage]; /* 此处info 有六个值 * UIImagePickerControllerMediaType; // an NSString UTTypeImage) * UIImagePickerControllerOriginalImage; // a UIImage 原始图片 * UIImagePickerControllerEditedImage; // a UIImage 裁剪后图片 * UIImagePickerControllerCropRect; // an NSValue (CGRect) * UIImagePickerControllerMediaURL; // an NSURL * UIImagePickerControllerReferenceURL // an NSURL that references an asset in the AssetsLibrary framework * UIImagePickerControllerMediaMetadata // an NSDictionary containing metadata from a captured photo */ _imageview.image = image;}