UIImagePickerController出錯

Question

我有這段代碼用於在推文上發送圖像。當我嘗試應用程序時，選取器運作良好，但它不抓住圖像。怎麼了？

- (IBAction)sendImageTweet:(id)sender 
{ 
    UIImagePickerController *picker = [[UIImagePickerController alloc] init]; 
    picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary; 
    picker.delegate = self; 
    picker.allowsEditing = NO; 
    [self presentModalViewController:picker animated:YES]; 
} 

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info 
{ 
    TWTweetComposeViewController *tweetViewController = [[TWTweetComposeViewController alloc] init]; 
    UIImage *image = [info objectForKey:@"UIImagePickerControllerOriginalImage"]; 
    NSData *imageData = UIImagePNGRepresentation(image); 
    [self dismissModalViewControllerAnimated:YES]; 
    [tweetViewController addImage:(UIImage *)imageData]; 
    [self presentModalViewController:tweetViewController animated:YES]; 
} 

Answer 1

你應該使用常量，而不是NSString和鍵。

UIImage *image = [info objectForKey:UIImagePickerControllerOriginalImage];