将 JPG 图像从文档保存到相册 - 示例代码

Question

我生成了 JPG 图像，保存到 Documents 文件夹中，捆绑包中没有。 请帮助构建 class 以将其保存到图库。

Finnaly 在kviksilver的帮助下

要做出完整的解决方案：

// 工具.h

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

@interface tools : NSObject {

}

@end

// 工具.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

最后必须从 CPP 包装器中调用它：

void onCPPSaveImgToCamRoll ( )
{
    return saveImage;
}

Answer 1

您的答案在 UIImage Class 参考的第一页。

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 class 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

}

你应该没事——