- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view.
     
    UIImageView *imageView = [[UIImageView alloc] init];
    imageView.frame = CGRectMake(0, 0, 80, 120);
    imageView.backgroundColor = [UIColor greenColor];
    imageView.tag = 101;
     
    [self.view addSubview:imageView];
     
    UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    button.frame = CGRectMake(0, 200, 100, 30);
    [button setTitle:@"打开相册" forState:UIControlStateNormal];
    [button addTarget:self action:@selector(openPics) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:button];
     
    UIButton *button2 = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    button2.frame = CGRectMake(0, 300, 100, 30);
    [button2 setTitle:@"打开相机" forState:UIControlStateNormal];
    [button2 addTarget:self action:@selector(openCamera) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:button2];
}
 
// 打开相机
- (void)openCamera {
    // UIImagePickerControllerCameraDeviceRear 后置摄像头
    // UIImagePickerControllerCameraDeviceFront 前置摄像头
    BOOL isCamera = [UIImagePickerController isCameraDeviceAvailable:UIImagePickerControllerCameraDeviceRear];
    if (!isCamera) {
        NSLog(@"没有摄像头");
        return ;
    }
     
    UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];
    imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;
    imagePicker.delegate = self;
    // 编辑模式
    imagePicker.allowsEditing = YES;
     
    [self  presentViewController:imagePicker animated:YES completion:^{
    }];
 
     
}
 
 
// 打开相册
- (void)openPics {
 
    UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];
    imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
    imagePicker.delegate = self;
    [self  presentViewController:imagePicker animated:YES completion:^{
    }];
     
     
}
 
 
// 选中照片
 
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{
    NSLog(@"%@", info);
    UIImageView  *imageView = (UIImageView *)[self.view viewWithTag:101];
    // UIImagePickerControllerOriginalImage 原始图片
    // UIImagePickerControllerEditedImage 编辑后图片
    UIImage *image = [info objectForKey:UIImagePickerControllerEditedImage];
    imageView.image = image;
    [picker dismissViewControllerAnimated:YES completion:NULL];
     
}
 
 
 
// 取消相册
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker {
    [picker dismissViewControllerAnimated:YES completion:NULL];
 
}