如何從相機膠卷中選擇圖片，然后將其保存到應用程序的“ Supporting Files”文件夾中，然后選擇已保存文件的名稱？

Question

我正在Objective-C中構建一個iOS游戲，其中一部分是能夠解鎖新的“飛船”。 現在，我有一些，但是我想要一個“自定義飛船”選項，用戶可以從其相機膠卷中選擇一張圖像，然后將其顯示為游戲中的飛船。

因此，我想知道如何選擇一張圖片（不需要相機），然后將其保存到應用程序的Supporting Files文件夾中，以便游戲可以調用它。 我還需要找出文件的名稱，以便游戲可以調用正確的圖像。

任何幫助，將不勝感激。

我努力了

-(IBAction)chooseFromLibrary:(id)sender
{

UIImagePickerController *imagePickerController= [[UIImagePickerController alloc]init];
[imagePickerController setSourceType:UIImagePickerControllerSourceTypePhotoLibrary];

// image picker needs a delegate so we can respond to its messages
[imagePickerController setDelegate:self];

// Place image picker on the screen
[self presentViewController:imagePickerController animated:YES completion:nil];

}

//delegate method will be called after picking photo either from camera or library
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
[self dismissViewControllerAnimated:YES completion:nil];
UIImage *image = [info objectForKey:UIImagePickerControllerOriginalImage];

NSData *dataImage = [[NSData alloc] init];
dataImage = UIImagePNGRepresentation(image);
NSString *stringImage = [dataImage base64EncodedStringWithOptions:NSDataBase64Encoding64CharacterLineLength];

stringImage = customImage;
}

這是稍微從回答修改后的代碼這個 StackOverflow的職位。

customImage是放入NSUserDefaults中以保存它的字符串，如下所示：

-(IBAction)enableCustom:(id)sender
{
NSString *playerSprite = customImage;
[[NSUserDefaults standardUserDefaults] setObject:playerSprite forKey:@"playerImage"];

NSString *playerImage = [[NSUserDefaults standardUserDefaults]
                         stringForKey:@"playerImage"];

UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Wow you unlocked custom" message:@"Fail lol" delegate:self cancelButtonTitle:@"ur mean" otherButtonTitles:@"haha ur an more poor then mi", nil];
[alert show];
}

因此，警報效果很好，但是當我嘗試玩游戲時，它沒有顯示圖像，而是顯示了一個帶有大紅色“ X”的白色框。 我不確定是怎么回事。

Answer 1

要選擇圖像並將其保存到自定義文件夾，請使用以下代碼：

-(IBAction)chooseFromLibrary:(id)sender
{

UIImagePickerController *imagePickerController= [[UIImagePickerController alloc]init];
[imagePickerController setSourceType:UIImagePickerControllerSourceTypePhotoLibrary];

// image picker needs a delegate so we can respond to its messages
[imagePickerController setDelegate:self];

// Place image picker on the screen
[self presentViewController:imagePickerController animated:YES completion:nil];

}

//delegate methode will be called after picking photo either from camera or library
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{

[self dismissViewControllerAnimated:YES completion:NULL];

UIImage* image;

if([[info valueForKey:@"UIImagePickerControllerMediaType"] isEqualToString:@"public.image"])
{

    image = [info valueForKey:@"UIImagePickerControllerOriginalImage"];

    NSString *stringPath = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)objectAtIndex:0]stringByAppendingPathComponent:@"custom"];

    // Custom Images is your folder name

    NSError *error = nil;

    if (![[NSFileManager defaultManager] fileExistsAtPath:stringPath])
        [[NSFileManager defaultManager] createDirectoryAtPath:stringPath withIntermediateDirectories:NO attributes:nil error:&error];

    NSString *fileName = [stringPath stringByAppendingFormat:@"/image.jpg"];

    NSData *data = UIImageJPEGRepresentation(image, 1.0);

    [data writeToFile:fileName atomically:YES];

    customImage = fileName;
}
}

customImage是我在頭文件中設置為IBOutlet NSString的字符串變量。

然后在我的“啟用”代碼中，將customImage字符串放入NSUserDefaults中，以便能夠在游戲中對其進行訪問。 該代碼還包括帶有兩個按鈕的警報。

-(IBAction)enableCustom:(id)sender
{
NSString *playerSprite = customImage;
[[NSUserDefaults standardUserDefaults] setObject:playerSprite forKey:@"playerImage"];

NSString *playerImage = [[NSUserDefaults standardUserDefaults]
                         stringForKey:@"playerImage"];

UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Wow you unlocked custom" message:@"Fail lol" delegate:self cancelButtonTitle:@"ur mean" otherButtonTitles:@"haha ur an more poor then mi", nil];
[alert show];
}

非常感謝rmaddy用戶的幫助。 他們推薦我這篇文章 ，以備不時之需。