将 JPG 图像从文档保存到相册 - 示例代码

Question

我已经生成了 JPG 图像，保存到 Documents 文件夹中，该图像不随捆绑包一起提供。 请帮助建筑类别将其保存到图库。

最后在 kviksilver 的帮助下

做出完整的解决方案：

//tools.h

#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>

@interface tools : NSObject {

}

@end

//tools.m

#import "tools.m"

@implementation tools

-(IBAction)saveImage{

    NSArray *paths=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory=[paths objectAtIndex:0];
    NSString *imagePath=[documentsDirectory stringByAppendingPathComponent:@"file7.jpg"];
    UIImage *image=[UIImage imageWithContentsOfFile:imagePath];
    UIImageWriteToSavedPhotosAlbum(image, self,@selector(savedPhotoImage:didFinishSavingWithError:contextInfo:), nil);
}
@end

最后必须调用来自 CPP 包装器：

void onCPPSaveImgToCamRoll ( )
{
    return saveImage;
}

Answer 1

您的答案位于 UIImage 类参考的第一页中。

void UIImageWriteToSavedPhotosAlbum (
   UIImage  *image,
   id       completionTarget,
   SEL      completionSelector,
   void     *contextInfo
);

Answer 2

尝试像这样获取imagePath：

NSArray *paths=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory=[paths objectAtIndex:0];
NSString *imagePath=[documentsDirectory stringByAppendingPathComponent:@"Image.jpg"];

然后设置图像：

 UIImage *image=[UIImage imageWithContentsOfFile:imagePath];
UIImageWriteToSavedPhotosAlbum(image, self,@selector(savedPhotoImage:didFinishSavingWithError:contextInfo:), nil);

savedPhotoImage：didFinishSavingWithError：contextInfo：将在完成保存或失败时调用只需

在类中创建两个方法：

-(void)saveImage{ 

NSArray *paths=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 

NSString *documentsDirectory=[paths objectAtIndex:0]; 

NSString *imagePath=[documentsDirectory stringByAppendingPathComponent:@"Image.jpg"]; 

UIImage *image=[UIImage imageWithContentsOfFile:imagePath]; 

UIImageWriteToSavedPhotosAlbum(image, self,@selector(savedPhotoImage:didFinishSavingWithError:contextInfo:), nil);


} 
- (void)savedPhotoImage:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInf{ 

// possible error handling

}

你应该没问题 -