objective-c - iOS : Saving from current UIImageView to Photo Album Failed - Unable to save to photo album

Question

我想做一个应用程序，在按下按钮时从当前主 UIImageView 保存图像并将其保存到相册。

我的程序所做的是在我按下“保存到相册”按钮后显示错误。可能是我的代码结构不对。或者谁能​​告诉我正确的代码结构？

这是我到目前为止的进展。

-(IBAction) saveToPhotoAlbum{

NSString *saveMyPhoto=[NSHomeDirectory() stringByAppendingPathComponent:@"image.png"];

UIImage *saved=[UIImage imageWithContentsOfFile:saveMyPhoto]; 

NSData *imageData = [NSData dataWithContentsOfFile:(NSString *)UIImagePNGRepresentation(saved)];
[imageData writeToFile:(NSString *)saved atomically:YES ];

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



- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo
{
    UIAlertView *alert;


    if (error)
        alert = [[UIAlertView alloc] initWithTitle:@"Error" 
                                           message:@"Unable to save image to Photo Album." 
                                          delegate:self cancelButtonTitle:@"Ok" 
                                 otherButtonTitles:nil];
    else 
        alert = [[UIAlertView alloc] initWithTitle:@"Success" 
                                           message:@"Image saved to Photo Album." 
                                          delegate:self cancelButtonTitle:@"Ok" 
                                 otherButtonTitles:nil];
    [alert show];
    [alert release];
}

Answer 1

你应该给一个正确的路径来保存图像。一个也是读写的，检查文档目录，NSString * docPath=[NSHomeDirectory() stringByAppendingPathComponent:@"Documents"]，然后使用相同的方法添加文件名 -stringByAppendingPathComponent: 或只需创建一个包含两个内容的格式化字符串