iPhone 在某些图像格式上出现卡顿现象
我的应用程序允许从相机胶卷上传图像。当我尝试在上传之前将某些图像保存到我的文档目录中时，某些图像会导致应用程序崩溃。我在保存之前将图像转换为 PNG，但这没有帮助。这是错误...
Tue Aug 31 20:39:13 localhost XXX[76409] <Error>: CGBitmapContextCreate: unsupported parameter combination: 8 integer bits/component; 32 bits/pixel; 3-component color space; kCGImageAlphaLast; 1600 bytes/row.
Tue Aug 31 20:39:13 localhost XXX[76409] <Error>: CGContextConcatCTM: invalid context 0x0
Tue Aug 31 20:39:13 localhost XXX[76409] <Error>: CGContextSetInterpolationQuality: invalid context 0x0
Tue Aug 31 20:39:13 localhost XXX[76409] <Error>: CGContextDrawImage: invalid context 0x0
Tue Aug 31 20:39:13 localhost XXX[76409] <Error>: CGBitmapContextCreateImage: invalid context 0x0
这是我的代码示例...
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
UIImage *img = [info objectForKey:@"UIImagePickerControllerOriginalImage"];
NSData *pngData = UIImagePNGRepresentation(img);
UIImage *pngImg = [UIImage imageWithData:pngData];
... code to save image ...
}
My app allows upload of an image from the camera roll. Some images are causing the app to crash when I attempt to save them to my documents directory prior to upload. I'm converting the image to a PNG prior to saving, but that hasn't helped. Here's the error...
Tue Aug 31 20:39:13 localhost XXX[76409] <Error>: CGBitmapContextCreate: unsupported parameter combination: 8 integer bits/component; 32 bits/pixel; 3-component color space; kCGImageAlphaLast; 1600 bytes/row.
Tue Aug 31 20:39:13 localhost XXX[76409] <Error>: CGContextConcatCTM: invalid context 0x0
Tue Aug 31 20:39:13 localhost XXX[76409] <Error>: CGContextSetInterpolationQuality: invalid context 0x0
Tue Aug 31 20:39:13 localhost XXX[76409] <Error>: CGContextDrawImage: invalid context 0x0
Tue Aug 31 20:39:13 localhost XXX[76409] <Error>: CGBitmapContextCreateImage: invalid context 0x0
and here's a sample of my code...
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
UIImage *img = [info objectForKey:@"UIImagePickerControllerOriginalImage"];
NSData *pngData = UIImagePNGRepresentation(img);
UIImage *pngImg = [UIImage imageWithData:pngData];
... code to save image ...
}
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另请注意，您所做的事情是多余的并且浪费内存。
img和pngImg是相同的。或者是否有特定原因将图像转换为 png 然后再转换回图像？Note also that what you are doing is redundant and a waste of memory.
imgandpngImgare the same. Or is there a specific reason that you convert an image to png and then back to an image?