iOS访问相册及拍照保存的实现实例

1、点击访问相册按钮，可以访问系统相册，选择以后返回在imageView中显示

2、点击拍照，访问摄像头，实现以后保存在相册中，返回在imageView中显示

注意：拍照功能需要真机调试，模拟器无法实现

模拟器会有如下效果~弹出警告框

ViewController.h

@interface ViewController : UIViewController<UINavigationControllerDelegate,UIImagePickerControllerDelegate>

@property (weak, nonatomic) IBOutlet UIImageView *imageShow;

@end

ViewController.m

#pragma mark - 拍照并保存
- (IBAction)takePhotoAction:(id)sender {
    BOOL isCamera = [UIImagePickerController isCameraDeviceAvailable:UIImagePickerControllerCameraDeviceRear];
    if (!isCamera) { //若不可用，弹出警告框
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"无可用摄像头" message:nil delegate:self cancelButtonTitle:@"确定" otherButtonTitles:nil, nil];
        [alert show];
        return;
    }
    UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];
    imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;
    /**
     *      UIImagePickerControllerSourceTypePhotoLibrary  ->所有资源文件夹
            UIImagePickerControllerSourceTypeCamera        ->摄像头
            UIImagePickerControllerSourceTypeSavedPhotosAlbum ->内置相册
     */
    imagePicker.delegate = self;    //设置代理，遵循UINavigationControllerDelegate,UIImagePickerControllerDelegate协议
    [self presentViewController:imagePicker animated:YES completion:nil];
}

#pragma mark - 访问相册
- (IBAction)browseAlbum:(id)sender {
    UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];
    imagePicker.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;
    imagePicker.delegate = self;
    [self presentViewController:imagePicker animated:YES completion:nil];
}

#pragma mark - 协议方法的实现
//协议方法，选择完毕以后，呈现在imageShow里面
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
    NSLog(@"%@",info);  //UIImagePickerControllerMediaType,UIImagePickerControllerOriginalImage,UIImagePickerControllerReferenceURL
    NSString *mediaType = info[@"UIImagePickerControllerMediaType"];
    if ([mediaType isEqualToString:@"public.image"]) {  //判断是否为图片

        UIImage *image = [info objectForKey:UIImagePickerControllerOriginalImage];
        self.imageShow.image = image;

        //通过判断picker的sourceType，如果是拍照则保存到相册去
        if (picker.sourceType == UIImagePickerControllerSourceTypeCamera) {
            UIImageWriteToSavedPhotosAlbum(image, self, @selector(image:didFinishSavingWithError:contextInfo:), nil);
        }
    }
//  else  当然可能是视频，这里不作讨论~方法是类似的~
    [picker dismissViewControllerAnimated:YES completion:nil];
}

//此方法就在UIImageWriteToSavedPhotosAlbum的上方
- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo {
    NSLog(@"已保存");
}

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