我有一个通用二进制应用程序,目前在 iTunes 中发布,并且在 iOS 4.x 到 5.1 上的 iPhone 3、4、4S、iPad 2 上正常工作,但在运行 iOS 5.1 的新 iPad (3) 上显示黑色 UIImage。
有人遇到过这种情况么?有什么修复建议吗?
问题是从 NSData 加载的 UIImage 显示为黑色。
我最初认为 NSData 可能是 nil 或不可读,所以我添加了 UIAlert 和 NSLog 来输出 NSData 长度和 UIImage 大小属性(假设成功将数据读入 UIImage 会产生合理的大小值)。UIAlert 中的一切看起来都不错...
// MyView.m
- (NSData*)getImageData
{
Screening *screen = [[Model sharedInstance] screenInProgress];
return screen.anteriorImage; // returns the NSData from the managed 'Screening' object
}
- (void)viewWillAppear:(BOOL)animated
{
NSData *imagedata = [self getImageData];
UIImage *image = [UIImage imageWithData:imagedata];
[clientImageView setImage:image]; /// UIImageView in nib
/// apply user grid
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
if ([defaults integerForKey:@"com.ikonetics.posture.gridoverlay"] >= 0) {
UIImageView *grid = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"grid.png"]];
[grid setBackgroundColor:[UIColor clearColor]];
[grid setAlpha:0.6f];
[grid setFrame:clientImageView.frame];
[screenshotWrapper addSubview:grid]; // screenshotWrapper is a UIView in xib arranged as a parent to other views
[grid release];
}
NSString *note = [NSString
stringWithFormat:@"NSData length: %d \nUIImage size: %@ \nUIImage scale: %1.f \nClientImage info: %@"
, [imagedata length]
, NSStringFromCGSize(image.size)
, image.scale
, [clientImageView description]
];
NSLog(@"debug note: %@ ", note);
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"DEBUG INFO"
message:note
delegate:nil
cancelButtonTitle:@"OK"
otherButtonTitles:nil];
[alert show];
[alert release];
}
// Screening.h
@interface Screening : NSManagedObject
@property (nonatomic, retain) NSData * anteriorImage; // this data is stored elsewhere using UIImageJPEGRepresentation(image, 0.8);
...
@end
显示 UIAlertView 的 iPad 3 的屏幕截图,您可以看到 NSData 有长度,UIImage 有大小,并且 UIImageView (ClientImage) 有合理的框架,并且网格覆盖 UIImage 正确显示,如预期的那样。
- 返回的 NSData 有长度并且不是
nil
(下面的 187433) - UIImage 能够解析数据并构建图像,通过大小和比例属性证明(784, 980)
最后,这也已在/// apply user grid
禁用选项的情况下进行了测试,因此覆盖 png 甚至没有实例化,因为该代码块没有运行。黑色 UIImage 问题仍然存在。
其他人对显示黑色 UIImage 而不是实际图像的 UIImageView 有问题吗?关于如何修复代码以使其在 iPad 3 上正常工作的任何想法或想法?
谢谢!
编辑 - 更多调试信息:
我将 NSData (imagedata) 写到了电子邮件中,这样我就可以在设备上查看它。我想知道图像本身是否为空白/黑色,并了解到数据在保存设备时正确显示为图像(它不是空白的)。
因此,加载到 UIImage 和 UIImageView 中的 NSData 显示为黑色......但是当附加到电子邮件时,它会正确显示图像。
此外,我想确保视图的层次结构按预期显示;检查我的图像是否不在另一个视图下方。从 ViewController 开始view
,我记录recursiveDescription
并了解到 iPad 3 上的视图层次结构与 iPad 2 匹配,这正是我所期望的。
新的调试代码:
NSString *note = [NSString
stringWithFormat:@"NSData length: %d \nUIImage size: %@ \nUIImage scale: %1.f \nRecursive info: %@"
, [imagedata length]
, NSStringFromCGSize(image.size)
, image.scale
, [[self view] recursiveDescription]
];
MFMailComposeViewController *mailViewController = [[MFMailComposeViewController alloc] init];
mailViewController.mailComposeDelegate = self;
[mailViewController setSubject:@"Debug email"];
[mailViewController setMessageBody:note isHTML:NO];
[mailViewController addAttachmentData:imagedata mimeType:@"image/jpg" fileName:@"imagedata.jpg"];
[self presentModalViewController:mailViewController animated:YES];
[mailViewController release];
最后,这是来自 2 和 3 设备的递归日志信息:
iPad 2 日志:
NSData length: 123254
UIImage size: {800, 960}
UIImage scale: 1
Recursive info: <UIView: 0x10a91620; frame = (0 0; 768 960); autoresize = W+H; layer = <CALayer: 0x10a91650>>
| <UIScrollView: 0x10a90a10; frame = (0 0; 768 960); clipsToBounds = YES; autoresize = RM+TM; layer = <CALayer: 0x10a90bb0>; contentOffset: {0, 0}>
| | <UIView: 0x10a90be0; frame = (0 0; 1536 1920); autoresize = LM+RM+TM+BM; layer = <CALayer: 0x10a90c10>>
| | | <UIView: 0x10a90c40; frame = (384 480; 768 960); autoresize = LM+RM+TM+BM; layer = <CALayer: 0x10a90c70>>
| | | | <UIImageView: 0x10a908f0; frame = (0 0; 768 960); opaque = NO; autoresize = LM+RM+TM+BM; userInteractionEnabled = NO; layer = <CALayer: 0x10a90930>>
| | | | <LineView_iPad: 0x10a90ce0; frame = (0 0; 768 960); autoresize = LM+RM+TM+BM; userInteractionEnabled = NO; layer = <CALayer: 0x10a90d20>>
| | | | <PointView_iPad: 0x10a90dd0; frame = (0 0; 768 960); autoresize = LM+RM+TM+BM; layer = <CALayer: 0x10a90e20>>
| | | | <UIImageView: 0x10a96480; frame = (0 0; 768 960); alpha = 0.6; opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x10a966e0>>
| <UIView: 0x10a91680; frame = (-10 750; 220 220); autoresize = RM+TM; layer = <CALayer: 0x10a916b0>>
| | <UIImageView: 0x10a916e0; frame = (0 0; 220 220); autoresize = W+H; userInteractionEnabled = NO; layer = <CALayer: 0x10a91720>>
| | <UIImageView: 0x10a91480; frame = (10 10; 200 200); autoresize = RM+BM; userInteractionEnabled = NO; layer = <CALayer: 0x10a914c0>>
| | <UIImageView: 0x10a91840; frame = (102 102; 16 16); autoresize = RM+BM; userInteractionEnabled = NO; layer = <CALayer: 0x10a91880>>
iPad 3 日志:
NSData length: 166252
UIImage size: {784, 980}
UIImage scale: 1
Recursive info: <UIView: 0xc669470; frame = (0 0; 768 980); autoresize = W+H; layer = <CALayer: 0xc667550>>
| <UIScrollView: 0x33d410; frame = (0 20; 768 960); clipsToBounds = YES; autoresize = RM+TM; layer = <CALayer: 0x325840>; contentOffset: {0, 0}>
| | <UIView: 0x308630; frame = (0 0; 1536 1920); autoresize = LM+RM+TM+BM; layer = <CALayer: 0xc666f40>>
| | | <UIView: 0x318970; frame = (384 480; 768 960); autoresize = LM+RM+TM+BM; layer = <CALayer: 0xc682a70>>
| | | | <UIImageView: 0xc66cd60; frame = (0 0; 768 960); opaque = NO; autoresize = LM+RM+TM+BM; userInteractionEnabled = NO; layer = <CALayer: 0xc672c00>>
| | | | <LineView_iPad: 0x301680; frame = (0 0; 768 960); autoresize = LM+RM+TM+BM; userInteractionEnabled = NO; layer = <CALayer: 0x329fa0>>
| | | | <PointView_iPad: 0xc6841b0; frame = (0 0; 768 960); autoresize = LM+RM+TM+BM; layer = <CALayer: 0xc672b10>>
| | | | <UIImageView: 0xc588b70; frame = (0 0; 768 960); alpha = 0.6; opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0xc589500>>
| <UIView: 0x324330; frame = (-10 770; 220 220); autoresize = RM+TM; layer = <CALayer: 0xc687970>>
| | <UIImageView: 0xc665b80; frame = (0 0; 220 220); autoresize = W+H; userInteractionEnabled = NO; layer = <CALayer: 0x321490>>
| | <UIImageView: 0x314e50; frame = (10 10; 200 200); autoresize = RM+BM; userInteractionEnabled = NO; layer = <CALayer: 0xc684f30>>
| | <UIImageView: 0x63d220; frame = (102 102; 16 16); autoresize = RM+BM; userInteractionEnabled = NO; layer = <CALayer: 0xc580d90>>
尽管这篇文章长得令人难以忍受,但我确实希望有人能想到任何可能导致这个问题的事情......