Question

我已经检查了几个教程，从我可以告诉我的代码是正确的，但最后我没有得到图像。我没有收到任何错误，但我试图设置的屏幕上的图像仍然是空白的。

这是我的头文件

@interface homeViewController : UIViewController<UIImagePickerControllerDelegate, UINavigationControllerDelegate>

@property (weak, nonatomic) IBOutlet UIImageView *avatarImage;
@property (weak, nonatomic) IBOutlet UIButton *photoButton;

@property (nonatomic, retain) UIImagePickerController *imgPicker;

- (IBAction)setPhoto;

@end

这是相关的方法

- (IBAction)setPhoto 
{
    self.imgPicker = [[UIImagePickerController alloc] init];
    self.imgPicker.sourceType=UIImagePickerControllerSourceTypeCamera;
    self.imgPicker.delegate=self;
    self.imgPicker.allowsEditing = YES;
    self.imgPicker.showsCameraControls=YES;

    [self presentModalViewController:self.imgPicker animated:YES];
}

- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker 
{ 
    [picker dismissModalViewControllerAnimated:YES]; 
}


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

    self.avatarImage = [[UIImageView alloc] init];
    self.avatarImage.image = image;
    [self dismissModalViewControllerAnimated:YES];
}

当我在这里放置一个断点时：[self dismissModalViewControllerAnimated：YES]; 我看到图像变量有一个值，但self.avatarImage有一个0x00000000

Answer 1

由于您指定了allowsEditing = NO，因此您需要使用UIImagePickerControllerOriginalImage信息密钥。

注意：如果不进行编辑，可能是'EditedImage'默认为'OriginalImage'。在这种情况下，你的'image'变量将是有效的，并且self.avatarView中UIImageView的显示将是罪魁祸首。

Answer 2

您使用的是错误的委托方法。使用

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info

您使用的委托方法在iOS 3.0中已弃用。

Answer 3

行

[picker dismissModalViewControllerAnimated:YES];
[picker release];

在使用信息词典之前必须出现。

无法从UIImagePickerController获取图像

3 个答案: