【学习ios之路:UI系列】获取透过UIImagePackerController获取的系统相册图片的名称信息及保存系统相册到本地

【学习ios之路:UI系列】获取通过UIImagePackerController获取的系统相册图片的名称信息及保存系统相册到本地

通过IUImagePickerController方法获取系统的相册,而想要得到从系统相册得到的图片的信息需要以下几步:

1：获得从UIImagePicker选择的照片的Assert；

2：得到Assert的ALAssertRepresentation；

3：ALAssertRepresentation有个filename的属性

代码具体如下:

该方法是UIImagePickerController中的代理中的方法

<span style="font-size:18px;"> - (void)imagePickerController:(UIImagePickerController *)picker 
                              didFinishPickingMediaWithInfo:(NSDictionary *)info {  
      
        NSURL *imageURL = [info valueForKey:UIImagePickerControllerReferenceURL];  
        ALAssetsLibraryAssetForURLResultBlock resultblock = ^(ALAsset *myasset)  
        {  
            ALAssetRepresentation *representation = [myasset defaultRepresentation];  
            NSString *fileName = [representation filename];  
            NSLog(@"fileName : %@",fileName);  
        };  
      
     ALAssetsLibrary* assetslibrary = [[[ALAssetsLibrary alloc] init] autorelease];  
        [assetslibrary assetForURL:imageURL   
                       resultBlock:resultblock  
                      failureBlock:nil];  
      
    } </span>

注:想要用到以上操作,需要引入以下的内容

<span style="font-size:18px;">#import <AssetsLibrary/ALAsset.h>

#import <AssetsLibrary/ALAssetsLibrary.h>

#import <AssetsLibrary/ALAssetsGroup.h>

#import <AssetsLibrary/ALAssetRepresentation.h></span>

如下效果:

【学习ios之路:UI系列】获取透过UIImagePackerController获取的系统相册图片的名称信息及保存系统相册到本地

2.获取系统相册中的图片,将图片保存到本地

注:转化为NSData类型来保存图片,代码如下:

 //保存图片 方法1 
 //NSArray*paths=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,
                                                         NSUserDomainMask, YES);  
 //NSString*documentsDirectory=[paths objectAtIndex:0];    
 //NSString*aPath=[documentsDirectory 
       stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.jpg",@"test"]];
 //方法2
 //NSHomeDirectory(),方法是获取沙盒根路径,test是自定义图片名,可用上述方法中获取的名字替换
 NSString *aPath=[NSString stringWithFormat:
                                  @"%@/Documents/%@.jpg",NSHomeDirectory(),@"test"]; 
 //image是对应的图片,即图片通过UIPickerController获取系统相册图 
 NSData *imgData = UIImageJPEGRepresentation(image,0);   
  //保存到当地文件中   
 [imgData writeToFile:aPath atomically:YES];

整理以上代码如下:

- (void)imagePickerController:(UIImagePickerController *)picker 
                            didFinishPickingMediaWithInfo:(NSDictionary *)info {
    //获取正在编辑的图片
    UIImage *image = [info valueForKey:UIImagePickerControllerEditedImage];
    self.imageUrl = [info valueForKey:UIImagePickerControllerReferenceURL];
    
    
    //获取图片的名字信息
    ALAssetsLibraryAssetForURLResultBlock resultblock = ^(ALAsset *myasset)
    {
        ALAssetRepresentation *representation = [myasset defaultRepresentation];
        self.imageName = [representation filename];//self.imageName是属性
    };
    
    ALAssetsLibrary* assetslibrary = [[[ALAssetsLibrary alloc] init] autorelease];
    [assetslibrary assetForURL:self.imageUrl
                   resultBlock:resultblock
                  failureBlock:nil];
    //将图片添加到新的视图上
    self.imageView.image = image;
    
    [self dismissViewControllerAnimated:YES completion:^{
    

    //获取图片的类型前的名字,将字符串切割操作   
   NSString *imagePath = [[self.imageName componentsSeparatedByString:@"."] 
                                               firstObject];
   NSString *aPath=[NSString stringWithFormat:@"%@/Documents/%@.jpg",
                                                    NSHomeDirectory(),imagePath];

        
  NSData *imgData = UIImageJPEGRepresentation(image,0);
  [imgData writeToFile:aPath atomically:YES];
    
    }];
}

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【学习ios之路:UI系列】获取透过UIImagePackerController获取的系统相册图片的名称信息及保存系统相册到本地

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