[英]Screenshot code working perfectly in Simulator but not in iOS Device
這是我的屏幕快照代碼,可保存在庫中或發送電子郵件。 問題是,它在Simulator中運行良好,但是當我在Device中運行此代碼時,無論在屏幕上什么,它只會顯示白色圖像。 我已經嘗試過同時使用iOS 5和iOS 6,但沒有運氣我應該錯了的原因是什么
NSInteger myDataLength = 320 * 430 * 4;
GLubyte *buffer1 = (GLubyte *) malloc(myDataLength);
GLubyte *buffer2 = (GLubyte *) malloc(myDataLength);
//Read image memory form OpenGL
glReadPixels(0, 50, 320, 430, GL_RGBA, GL_UNSIGNED_BYTE, buffer1);
//Invert result image buffer into secondary buffer
for(int y = 0; y < 430; y++) {
for(int x = 0; x < 320 * 4; x++) {
buffer2[(429 - y) * 320 * 4 + x] = buffer1[y * 4 * 320 + x];
}
}
//Create bitmap context
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
CGContextRef destContext = CGBitmapContextCreate(buffer2, 320, 430, 8, 320 * 4, colorSpace, kCGImageAlphaPremultipliedLast | kCGBitmapByteOrder32Big);
//Get image from context
CGImageRef resultContext = CGBitmapContextCreateImage(destContext);
UIImage *resultImg = [UIImage imageWithCGImage: resultContext];
CGImageRelease(resultContext);
//Send to mail or Save to PhotoLibrary
if (sendMail) {
[self emailImage: resultImg];
} else {
UIImageWriteToSavedPhotosAlbum(resultImg, nil, nil, nil);
}
//Release allocated memory
// [resultImg release];
free(buffer2);
free(buffer1);
CGContextRelease(destContext);
CGColorSpaceRelease(colorSpace);
有沒有我正在使用的任何類,模擬器都支持該類,而不是該設備?如果是,那么哪個類,因為據我搜索,我什么都沒找到。
我發現我上面的代碼很完美,問題不在這里。實際上問題出在
eaglLayer.drawableProperties
我已經從此代碼更改
eaglLayer.drawableProperties = [NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithBool:NO],
kEAGLDrawablePropertyRetainedBacking,
kEAGLColorFormatRGB565,
kEAGLDrawablePropertyColorFormat, nil];
對此
eaglLayer.drawableProperties = [NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithBool:YES],
kEAGLDrawablePropertyRetainedBacking,
kEAGLColorFormatRGB565,
kEAGLDrawablePropertyColorFormat, nil];
我剛設定
kEAGLDrawablePropertyRetainedBacking = YES
謝謝上帝,一切正常。 但不知道為什么有人知道請告訴我
試試這個,它在設備上對我來說很完美:
+ (UIImage *)imageFromView:(UIView *)view inRect:(CGRect)rect {
CGFloat screenScale = [[UIScreen mainScreen] scale];
if ([view respondsToSelector:@selector(contentSize)]) {
UIScrollView *scrollView = (UIScrollView *)view;
UIGraphicsBeginImageContextWithOptions(scrollView.contentSize, NO, screenScale);
} else {
UIGraphicsBeginImageContextWithOptions(view.bounds.size, NO, screenScale);
}
CGContextRef resizedContext = UIGraphicsGetCurrentContext();
[view.layer renderInContext:resizedContext];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
image = [UIImage imageWithCGImage:CGImageCreateWithImageInRect(image.CGImage, CGRectMake(rect.origin.x*screenScale, rect.origin.y*screenScale, rect.size.width*screenScale, rect.size.height*screenScale))];
UIGraphicsEndImageContext();
return [image imageScaledToSize:CGSizeMake(rect.size.width, rect.size.height)];
}
- (UIImage *)imageScaledToSize:(CGSize)newSize {
if ((self.size.width == newSize.width) && (self.size.height == newSize.height)) {
return self;
}
UIGraphicsBeginImageContextWithOptions(newSize, NO, 0.0);
[self drawInRect:CGRectMake(0, 0, newSize.width, newSize.height)];
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newImage;
}
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