“imagePickerController：didFinishPickingMediaWithInfo：”的问题

Question

我一直收到一个未使用的变量警告。我正在尝试显示模式视图，用户选择照片，我想在UIImageView中使用所选图像。

不确定这是否足够，但我真的很感激任何帮助。

- (IBAction) buttonPressed:(UIButton *)sender { 
    UIImagePickerController *picker = [[UIImagePickerController alloc] init]; 
    picker.delegate = self;
    [self presentModalViewController:picker animated:YES];
    [picker release];
}

- (void) imagePickerController:( UIImagePickerController *)picker didFinishPickingMediaWithInfo: (NSDictionary *)info { 
    UIImage *image = [info objectForKey: UIImagePickerControllerOriginalImage];
}

Answer 1

您收到警告，因为您不再使用图片对象了。您必须将此图像保存在某个类对象中以在代码中的某处使用它，如果您这样做，警告将自动消失。或者只是删除你可以做的警告：

-(void) imagePickerController:( UIImagePickerController *)picker didFinishPickingMediaWithInfo: (NSDictionary *)info {  
 UIImage *image;  
 image=[info objectForKey: UIImagePickerControllerOriginalImage];   
}