如何調用本地相冊、相機

 

一、判斷系統是否支持相機

[UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]

二、建立相冊視圖控制器對象

UIImagePickerController *imagePickerController = [[UIImagePickerController alloc] init];

三、設置sourceType（資源類型）

imagePickerController.sourceType = UIImagePickerControllerSourceTypeCamera;//相機

imagePickerController.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;//圖片庫

imagePickerController.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;//保存的圖片

四、設置彈出動畫（可選）

imagePickerController.modalTransitionStyle = UIModalTransitionStyleCoverVertical;

五、設置是否容許編輯圖片

imagePickerController.allowsEditing = YES;

六、設置代理(UIImagePickerControllerDelegate)

imagePickerController.delegate = self;

七、實現代理方法：獲取圖片

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info

{

     [picker dismissViewControllerAnimated:YES completion:nil];

    //獲取圖片

     UIImage *image = [info objectForKey:UIImagePickerControllerOriginalImage];

}

//取消點擊

- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker

{

    [self dismissViewControllerAnimated:YES completion:^{}];

}

八、保存圖片到相冊

UIImageWriteToSavedPhotosAlbum(image, self, @selector(image:didFinishSavingWithError:contextInfo:), nil);//image：要保存的圖片UImage對象，

- (void) image: (UIImage *) image

didFinishSavingWithError: (NSError *) error

   contextInfo: (void *) contextInfo{

//若是error==NULL，則表示圖片保存成功

}

 

具體代碼：

- (void)viewDidLoad {
    [super viewDidLoad];
    UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];
    btn.frame = CGRectMake(10, 50, 80, 80);
    btn.backgroundColor = [UIColor redColor];

    [btn addTarget:self action:@selector(showpicker) forControlEvents:UIControlEventTouchUpInside];

    [self.view addSubview:btn]；   

}
-(void)showpicker{
    UIImagePickerController *imagepicker = [[UIImagePickerController alloc]init];
    imagepicker.sourceType = 2;//設置類型（0表明調用相冊，1 表明彈出相機）
    imagepicker.allowsEditing = YES;//是否容許編輯，默認no，設置爲yes時，點擊圖片會進入編輯界面（裁剪）
   

    imagepicker.delegate = self;//設置代理

    [self presentViewController:imagepicker animated:YES completion:nil];//彈出相冊／相機
}
//選擇圖片後調用的代理方法
-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info{
    NSLog(@"%@",info);
    UIImage *image = info[@"UIImagePickerControllerEditedImage"];//獲取圖片
    UIImageView *imageview = [[UIImageView alloc]initWithImage:image];
    imageview.frame = CGRectMake(40, 150, 100, 100);

    [self.view addSubview:imageview]; 

    [self dismissViewControllerAnimated:YES completion:nil];//消失imagepicker

}