如何封装选择相册

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1.很多时候，我们都在苦恼，该如何选择相册的图片;
首先，/*** 相册选择*/ @interface SXPickPhoto ：NSObject一个工具类，在这里，我将选择照片的调用系统的一系列方法进行了简单实现；

/**
 *  打开相机：
 *
 *  @param object 控制器对象
 */
- (void)ShowTakePhotoWithController: (UIViewController *)Controller
                       andWithBlock: (myblock)block;

/**
 *  选择相册
 *
 *  @param Controller 控制器对象
 */

- (void)SHowLocalPhotoWithController: (UIViewController *)Controller
                        andWithBlock: (myblock)block;

2.其中andWithBlock: (myblock)block 是我用于回调图片UIimage * image对象的,为了是代码更加清晰，我将相册和相机两个方法分开了。
下面直接上代码：

/**
 *  打开相机：
 *
 *  @param object 控制器对象
 */
- (void)ShowTakePhotoWithController: (UIViewController *)Controller
                       andWithBlock: (myblock)block
{
    //回调
    _myblock = block;
    UIImagePickerControllerSourceType sourceType = UIImagePickerControllerSourceTypeCamera;
  
    if ([UIImagePickerController isSourceTypeAvailable: UIImagePickerControllerSourceTypeCamera])
   
    {
        _picker.delegate = self;
     
        //设置拍照后的图片可被编辑
      
        _picker.allowsEditing = YES;
      
        _picker.sourceType = sourceType;
        
        [Controller presentViewController:_picker animated:YES completion:nil];
     
    }
    else
    {
        NSLog(@"模拟其中无法打开照相机,请在真机中使用");
    }
   
}

3.具体解释就不再赘述:

/**
 *  选择相册
 *
 *  @param Controller 控制器对象
 */
- (void)SHowLocalPhotoWithController: (UIViewController *)Controller
                        andWithBlock: (myblock)block
{
    _myblock = block;
    _picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
    
    _picker.delegate = self;
    
    //设置选择后的图片可被编辑
    
    _picker.allowsEditing = YES;
    
    [Controller presentViewController:_picker animated:YES completion:nil];
}

4.因为，前面有设置代理，图片在选择完以后，会调用以下代理方法:

//当一张图片后进入这里
-(void)imagePickerController:(UIImagePickerController*)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    NSString *type = [info objectForKey:UIImagePickerControllerMediaType];
    //当选择的类型是图片
    if ([type isEqualToString:@"public.image"])
     {
         //先把图片转成NSData
        UIImage* image = [info objectForKey:@"UIImagePickerControllerOriginalImage"];
         
         if (_myblock) {
             
             _myblock(image);
             
             [_picker dismissViewControllerAnimated:YES completion:nil];
         }

     }
    
}

// 取消选择照片:
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker

{
    NSLog(@"您取消了选择图片");
    [picker dismissViewControllerAnimated:YES completion:nil];
   
}

5.最后是如何使用选择相册:

#pragma mark - === 提示框 ===
- (void)aleShowView
{
    
    UIAlertAction * act1 = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
        
        
    }];
    //拍照：
    UIAlertAction * act2 = [UIAlertAction actionWithTitle:@"拍照" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
        
       //打开相机
        [_pickPhoto ShowTakePhotoWithController:self andWithBlock:^(NSObject *Data) {
           
            if ([Data isKindOfClass:[UIImage class]])
            {
                _imageView.image = (UIImage *)Data;
            }
          
        }];
        
    }];
    //相册
    UIAlertAction * act3 = [UIAlertAction actionWithTitle:@"相册" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
        
        //打开相册
        [_pickPhoto SHowLocalPhotoWithController:self andWithBlock:^(NSObject *Data) {
            if ([Data isKindOfClass:[UIImage class]])
            {
                _imageView.image = (UIImage *)Data;
            }
        }];
        
    }];
    
    UIAlertController * aleVC = [UIAlertController alertControllerWithTitle:@"提示" message:@"选择图片" preferredStyle:UIAlertControllerStyleActionSheet];
    [aleVC addAction:act1];
    [aleVC addAction:act2];
    [aleVC addAction:act3];
    
    [self presentViewController:aleVC animated:YES completion:nil];
}