封装相册选择器（UIImagePickerController）

项目从社区改版到个人中心改版，多个地方需要用到选择照片、拍照上传的功能。于是将UIImagePickerController进行了简单的封装，方便项目多个地方快速使用。

Screen Shot.png

1.对系统判断，区分使用UIAlertController还是UIActionSheet进行提示选择。判断当前机型是否支持拍照功能。

 if (IOS8) {
        UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"图片" message:@"选择" preferredStyle:UIAlertControllerStyleActionSheet];
        UIAlertAction *photoAlbumAction = [UIAlertAction actionWithTitle:@"相册" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
            [self getAlertActionType:1];
        }];
        UIAlertAction *cemeraAction = [UIAlertAction actionWithTitle:@"相机" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
            [self getAlertActionType:2];
        }];
        UIAlertAction *cancleAction = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
            [self getAlertActionType:0];
        }];
        [alertController addAction:photoAlbumAction];
        [alertController addAction:cancleAction];
        if ([self imagePickerControlerIsAvailabelToCamera]) {
            [alertController addAction:cemeraAction];
        }
        [self.viewController presentViewController:alertController animated:YES completion:nil];
    } else {
        UIActionSheet *actionSheet;
        if([self imagePickerControlerIsAvailabelToCamera]){
            actionSheet  = [[UIActionSheet alloc] initWithTitle:@"选择图像" delegate:self cancelButtonTitle:@"取消" destructiveButtonTitle:nil otherButtonTitles:@"拍照", @"从相册选择", nil];
        }else{
            actionSheet = [[UIActionSheet alloc] initWithTitle:@"选择图像" delegate:self cancelButtonTitle:@"取消" destructiveButtonTitle:nil otherButtonTitles:@"从相册选择", nil];
        }
        [actionSheet showInView:self.viewController.view];
    }

// 判断硬件是否支持拍照
- (BOOL)imagePickerControlerIsAvailabelToCamera {
    if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
        return YES;
    } else {
        return NO;
    }
}

2.根据上面的判断创建UIImagePickerController

- (void)getAlertActionType:(NSInteger)type {
    NSInteger sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
    switch (type) {
        case 1:
        {
            sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
        }
            break;
        case 2:
        {
            sourceType = UIImagePickerControllerSourceTypeCamera;
        }
            break;
        case 0:
        {
            return;
        }
            break;
            
        default:
            break;
    }
    [self creatUIImagePickerControllerWithAlertActionType:sourceType];  
}

3.创建UIImagePickerController并对当前系统授权进行判断

- (void)creatUIImagePickerControllerWithAlertActionType:(NSInteger)type {
    NSInteger sourceType = type;
    if (sourceType == UIImagePickerControllerSourceTypeCamera) {
        if (![self AVAuthorizationStatusIsGranted]) {
            if (IOS8) {
                UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"相机未授权" message:@"请到设置-隐私-相机中修改" preferredStyle:UIAlertControllerStyleAlert];
                UIAlertAction *comfirmAction = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
                    return;
                }];
                [alertController addAction:comfirmAction];
                [self.viewController presentViewController:alertController animated:YES completion:nil];
                
            } else {
                UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"相机未授权" message:@"请到设置-隐私-相机中修改" delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:nil, nil];
                [alert show];
                return;
            }
        }
    }
    
    self.picker = [[UIImagePickerController alloc] init];
    self.picker.delegate = self;
    self.picker.allowsEditing = YES;
    self.picker.sourceType = sourceType;
    [self.viewController presentViewController:self.picker animated:YES completion:nil];
}

#pragma mark - 照机授权判断
- (BOOL)AVAuthorizationStatusIsGranted  {
    __block BOOL isGranted = NO;
    //判断是否授权相机
    NSString *mediaType = AVMediaTypeVideo;
    AVAuthorizationStatus authStatus = [AVCaptureDevice authorizationStatusForMediaType:mediaType];
    switch (authStatus) {
        case 0: { //第一次使用，则会弹出是否打开权限
            [AVCaptureDevice requestAccessForMediaType : AVMediaTypeVideo completionHandler:^(BOOL granted) {
                //授权成功
                if (granted) {
                    isGranted = YES;
                }
                else{
                    isGranted = NO;
                }
            }];
        }
            break;
        case 1:{
            //还未授权
            isGranted = NO;
        }
            break;
        case 2:{
            //主动拒绝授权
            isGranted = NO;
        }
            break;
        case 3: {
            //已授权
            isGranted = YES;
        }
            break;
            
        default:
            break;
    }
    return isGranted;
}

4.实现代理，将选中照片回调

#pragma mark - UIImagePickerControllerDelegate
-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info
{
    //获取编辑后的图片
    UIImage *image = info[@"UIImagePickerControllerEditedImage"];
    if (!image) {
        image = info[UIImagePickerControllerOriginalImage];
    }
    NSLog(@"DELEGATE %@",image);
    if (self.photoBlock) {
        self.photoBlock(image);
    }
    [_picker dismissViewControllerAnimated:YES completion:nil];
}

// 取消选择照片:
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker {
    NSLog(@"取消图片选择");
    [picker dismissViewControllerAnimated:YES completion:nil];
    
}

5.使用

- (void)viewDidLoad {
    [super viewDidLoad];
    // 实例化LJXPhotoAlbum
    _photoAlbum = [[LJXPhotoAlbum alloc] init];
}

- (IBAction)takePhotoClick:(id)sender {
    // 调用getPhotoAlbumOrTakeAPhotoWithController方法
    [_photoAlbum getPhotoAlbumOrTakeAPhotoWithController:self andWithBlock:^(UIImage *image) {
        self.imageView.image = image;
    }];
}

代码下载地址

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