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我有一些代码可以在我的一个应用程序上运行；所以我复制了代码，进行了必要的更改(即 textField 名称等)并且它有效，除非我将它移动到 UIImageView；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:
Snapshotting a view that has not been rendered results in an empty snapshot. Ensure your view has been rendered at least once before snapshotting or snapshot after screen updates.
也许与此有关？我试图纠正警告，但无济于事。
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，决定是时候寻求帮助了。提前致谢。
标准差