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尝试使用照片选择器选择图像并将该图像内部保存在应用程序文件夹中。

- (void) imagePickerController: (UIImagePickerController *) pickerdidFinishPickingMediaWithInfo: (NSDictionary *) info {

NSString *mediaType = [info objectForKey: UIImagePickerControllerMediaType];
UIImage *originalImage, *editedImage, *imageToUse;

// Handle a still image picked from a photo album
if (CFStringCompare ((CFStringRef) mediaType, kUTTypeImage, 0)
    == kCFCompareEqualTo) {

    editedImage = (UIImage *) [info objectForKey:
                               UIImagePickerControllerEditedImage];
    originalImage = (UIImage *) [info objectForKey:
                                 UIImagePickerControllerOriginalImage];

    if (editedImage) {
        imageToUse = editedImage;
    } else {
        imageToUse = originalImage;
    }
    // Do something with imageToUse

    //save it
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString *imageName = [documentsDirectory stringByAppendingString:[NSString stringWithFormat:@"%d", myUniqueID]];
    NSString *imagePath = [imageName stringByAppendingPathComponent:@".png"];

    NSData *webData = UIImagePNGRepresentation(editedImage);
    NSError* error = nil;
    bool success = [webData writeToFile:imagePath options:NULL error:&error];
    if (success) {
        // successfull save
        imageCount++;
        [[NSUserDefaults standardUserDefaults] setInteger:imageCount forKey:@"imageCount"];
        NSLog(@"@Success save to: %@", imagePath);
    }
    else if (error) {
        NSLog(@"Error:%@", error.localizedDescription);
    }
}
...
}

我无法弄清楚的是writeToFile:::返回false但没有返回任何值，error所以我无法弄清楚出了什么问题。任何帮助将不胜感激谢谢

4

1 回答 1

1

你错过了一个“/”。该行：

NSString *imageName = [documentsDirectory stringByAppendingString:[NSString stringWithFormat:@"%d", myUniqueID]];

应该：

NSString *imageName = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:@"%d", myUniqueID]];

上面写着：

NSString *imagePath = [imageName stringByAppendingPathComponent:@".png"];

应该：

NSString *imagePath = [imageName stringByAppendingPathExtension:@"png"];

更新：

而且，不应该：

NSData *webData = UIImagePNGRepresentation(editedImage);

是以下？

NSData *webData = UIImagePNGRepresentation(imageToUse);
于 2012-10-07T19:13:39.620 回答