iOS UIImagePickerController在ios 6上出現奇怪的崩潰

Question

在我的應用程序中，我正在嘗試使用相機制作單張照片，但它無緣無故地崩潰。

我現在處理這個問題很久了，所以我提供的代碼似乎是不必要的：在viewcontroller中：

- (id) init
{
    if([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone)
    {
        self = [super initWithNibName:@"WCAddNewWatchViewController_iPhone" bundle:[NSBundle mainBundle]];
    }else
    {
        self = [super initWithNibName:@"WCAddNewWatchViewController_iPad" bundle:[NSBundle mainBundle]];
    }

    if(self)
    {

    }

    return self;
}
- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.

    [[self navigationItem]setRightBarButtonItem:self.AddButton];
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (IBAction)ChangeImageButtonTapped:(id)sender {
    UIImagePickerController* picker = [[UIImagePickerController alloc] init];

    if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera])
    {
        picker.sourceType = UIImagePickerControllerSourceTypeCamera;
    }
    else
    {
        picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
    }

    picker.mediaTypes = @[(NSString *) kUTTypeImage];
    picker.allowsEditing = NO;
    [picker setDelegate:self];

    [self presentViewController:picker animated:YES completion:nil];

}

#pragma mark UIImagePickerControllerDelegate

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

    NSString *mediaType = info[UIImagePickerControllerMediaType];

    [self dismissViewControllerAnimated:YES completion:nil];

    if ([mediaType isEqualToString:(NSString *)kUTTypeImage]) {
        UIImage *image = info[UIImagePickerControllerOriginalImage];
        selectedImage = image;
     //   self.watchImageView.image = selectedImage;

    }

    NSLog(@"no crash!!!!"); //that's a lie...
}

沒有崩潰消息，日志寫道應用程序收到內存警告，然后崩潰。 設備日志說：

TIL內存不足的殺手在iOS上被稱為“jetsam”

任何人都可以看看我的代碼並告訴我我做錯了什么？

Answer 1

你被監視程序進程殺了，因為你沒有處理內存警告（ios有監視內存使用和應用程序啟動時間並殺死看似流氓的應用程序的進程）

順便說一句：TIL =今天我學到了：D

使用縮小版圖像進行顯示。

- (UIImage *)scaledCopyOfSize:(CGSize)newSize {
    CGImageRef imgRef = self.CGImage;

    CGFloat width = CGImageGetWidth(imgRef);
    CGFloat height = CGImageGetHeight(imgRef);

    CGAffineTransform transform = CGAffineTransformIdentity;
    CGRect bounds = CGRectMake(0, 0, width, height);
    if (width > newSize.width || height > newSize.height) {
        CGFloat ratio = width/height;
        if (ratio > 1) {
            bounds.size.width = newSize.width;
            bounds.size.height = bounds.size.width / ratio;
        }
        else {
            bounds.size.height = newSize.height;
            bounds.size.width = bounds.size.height * ratio;
        }
    }

    CGFloat scaleRatio = bounds.size.width / width;
    CGSize imageSize = CGSizeMake(CGImageGetWidth(imgRef), CGImageGetHeight(imgRef));
    CGFloat boundHeight;
    UIImageOrientation orient = self.imageOrientation;
    switch(orient) {

        case UIImageOrientationUp: //EXIF = 1
            transform = CGAffineTransformIdentity;
            break;

        case UIImageOrientationUpMirrored: //EXIF = 2
            transform = CGAffineTransformMakeTranslation(imageSize.width, 0.0);
            transform = CGAffineTransformScale(transform, -1.0, 1.0);
            break;

        case UIImageOrientationDown: //EXIF = 3
            transform = CGAffineTransformMakeTranslation(imageSize.width, imageSize.height);
            transform = CGAffineTransformRotate(transform, M_PI);
            break;

        case UIImageOrientationDownMirrored: //EXIF = 4
            transform = CGAffineTransformMakeTranslation(0.0, imageSize.height);
            transform = CGAffineTransformScale(transform, 1.0, -1.0);
            break;

        case UIImageOrientationLeftMirrored: //EXIF = 5
            boundHeight = bounds.size.height;
            bounds.size.height = bounds.size.width;
            bounds.size.width = boundHeight;
            transform = CGAffineTransformMakeTranslation(imageSize.height, imageSize.width);
            transform = CGAffineTransformScale(transform, -1.0, 1.0);
            transform = CGAffineTransformRotate(transform, 3.0 * M_PI / 2.0);
            break;

        case UIImageOrientationLeft: //EXIF = 6
            boundHeight = bounds.size.height;
            bounds.size.height = bounds.size.width;
            bounds.size.width = boundHeight;
            transform = CGAffineTransformMakeTranslation(0.0, imageSize.width);
            transform = CGAffineTransformRotate(transform, 3.0 * M_PI / 2.0);
            break;

        case UIImageOrientationRightMirrored: //EXIF = 7
            boundHeight = bounds.size.height;
            bounds.size.height = bounds.size.width;
            bounds.size.width = boundHeight;
            transform = CGAffineTransformMakeScale(-1.0, 1.0);
            transform = CGAffineTransformRotate(transform, M_PI / 2.0);
            break;

        case UIImageOrientationRight: //EXIF = 8
            boundHeight = bounds.size.height;
            bounds.size.height = bounds.size.width;
            bounds.size.width = boundHeight;
            transform = CGAffineTransformMakeTranslation(imageSize.height, 0.0);
            transform = CGAffineTransformRotate(transform, M_PI / 2.0);
            break;

        default:
            [NSException raise:NSInternalInconsistencyException format:@"Invalid image orientation"];

    }

    if (UIGraphicsBeginImageContextWithOptions) {
        UIGraphicsBeginImageContextWithOptions(bounds.size, NO,
                                               /* 0.0f will scale to 1.0/2.0 depending on if the
                                                device has a high-resolution screen */
                                               0.0f);
    } else {
        UIGraphicsBeginImageContext(bounds.size);
    }

    CGContextRef context = UIGraphicsGetCurrentContext();

    if (orient == UIImageOrientationRight || orient == UIImageOrientationLeft) {
        CGContextScaleCTM(context, -scaleRatio, scaleRatio);
        CGContextTranslateCTM(context, -height, 0);
    }
    else {
        CGContextScaleCTM(context, scaleRatio, -scaleRatio);
        CGContextTranslateCTM(context, 0, -height);
    }

    CGContextConcatCTM(context, transform);

    CGContextDrawImage(context, CGRectMake(0, 0, width, height), imgRef);
    UIImage *imageCopy = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    return imageCopy;
}