更新:图像被捕获但不会显示

Question

我有一些代码正在处理我的某个应用程序; 所以我复制了代码,进行了必要的更改(即textField名称等),除非我将其移动到UIImageView,否则它会起作用; 没有出现.这是我的代码:

viewController.h(为简洁起见,仅显示相关部分)

#import "AppDelegate.h"
#import "Books.h"
#import <AVFoundation/AVFoundation.h>
#import "MBProgressHUD.h"
#import <MobileCoreServices/MobileCoreServices.h>
#import <UIKit/UIKit.h>

@class Books;

@interface DetailViewController : UIViewController <UITextFieldDelegate,
    UIPopoverControllerDelegate,
    UIPickerViewDataSource,
    UIPickerViewDelegate,
    UIActionSheetDelegate,
    UIScrollViewDelegate,
    UIImagePickerControllerDelegate,
    AVCaptureMetadataOutputObjectsDelegate>  {
}

//  UIView
@property (strong, nonatomic) IBOutlet UIView *bookDetailView;

//  camera stuff
@property (strong, nonatomic) IBOutlet UIImageView *oBookImage;
- (IBAction)bOpenCamera:(UIButton *)sender;

这是相关的viewController.m代码:

#pragma mark -  Camera stuff
- (IBAction)bOpenCamera:(UIButton *)sender {

if ([UIImagePickerController isSourceTypeAvailable: UIImagePickerControllerSourceTypeCamera])  {

    UIImagePickerController *imagePicker = [UIImagePickerController new];
    imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;
    imagePicker.mediaTypes = [NSArray arrayWithObjects: (NSString *) kUTTypeImage, nil];
    imagePicker.allowsEditing = YES;  //  MUST HAVE!

    [imagePicker setDelegate: (id)self];
    [self presentViewController:imagePicker animated:YES completion:nil];
}

}

-(void)image:(UIImage *)image finishedSavingWithError:(NSError *)error contextInfo:(void *)contextInfo  {

if (error) {
    CommonMethods *cm = [CommonMethods new];
    [cm displayAlert:@"Warning!" andData:@"Failed to save book image..." andTag:0 andViewController:self];
}
}


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

self.oBookImage.contentMode = UIViewContentModeScaleAspectFill;

NSString *mediaType = [info objectForKey:UIImagePickerControllerMediaType];
[self dismissViewControllerAnimated:NO completion:nil];

if ([mediaType isEqualToString:(NSString *)kUTTypeImage]) {  //  (abstract image data)

    UIImage *image =  [info objectForKey:UIImagePickerControllerOriginalImage];

    //  resize it...
    CGRect screenRect = CGRectMake(0, 0, 114.0, 128.0);  //  was 90.0, 120.0
    UIGraphicsBeginImageContext(screenRect.size);
    [image drawInRect:screenRect blendMode:kCGBlendModePlusDarker alpha:1];

    UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    oBookImage.image = newImage;  //  show it...

}
}

-(void)imagePickerControllerDidCancel:(UIImagePickerController *)picker  {

[self dismissViewControllerAnimated:NO completion:nil];
}

更新: 在捕获图像时的某个时刻,我收到此警告:

快照未呈现的视图会导致空快照.确保在屏幕更新后快照或快照之前至少渲染了一次视图.

也许这与它有关？我试图纠正警告,无济于事.

我在Google和SO中寻找过类似的问题,但一无所获.我已经为此工作了两天,并决定是时候寻求帮助了.提前致谢.

SD

Answer 1

我也一直遇到这个问题。经过几个小时的研究，我发现了这一点：iOS8 Snapshotting a view that has not be rendered results in an empty snapshot

也许最后一个答案可以帮助你？但愿如此。如果不是，那么它可能只是一个错误。