Objective c 在iPad上以纵向模式启动图像选择器
我正在使用以下代码在我的iPad应用程序(使用Cocos2D)中启动图像选择器: 我希望它一直以纵向模式启动,但它总是这样启动: 图像以纵向显示,图像选择器UI处于横向模式。但当我拍摄图像时,它会顺时针旋转90度Objective c 在iPad上以纵向模式启动图像选择器,objective-c,ios,xcode,ipad,Objective C,Ios,Xcode,Ipad,我正在使用以下代码在我的iPad应用程序(使用Cocos2D)中启动图像选择器: 我希望它一直以纵向模式启动,但它总是这样启动: 图像以纵向显示,图像选择器UI处于横向模式。但当我拍摄图像时,它会顺时针旋转90度 我希望图像选择器用户界面和拍摄的图像都处于纵向模式。我怎样才能解决这个问题 您需要做三件事: 告诉仅向其显示imagePicker的viewController 支持纵向定位 告诉imagePicker不要旋转实时相机馈送 取消旋转捕获的图像 imagePicker直接接收设备方向
我希望图像选择器用户界面和拍摄的图像都处于纵向模式。我怎样才能解决这个问题 您需要做三件事:
while ([currentDevice isGeneratingDeviceOrientationNotifications])
[currentDevice endGeneratingDeviceOrientationNotifications];
之所以将其放入循环中,是因为imagePicker开始生成DeviceOrientationNotifications,然后在其被解除时结束,使正常设备上的通知计数从1变为2变为1
解除imagePicker后,您可以调用:
while (![currentDevice isGeneratingDeviceOrientationNotifications])
[currentDevice beginGeneratingDeviceOrientationNotifications];
以便您的ViewController可以继续接收方向更改通知
不幸的是,即使关闭此选项,图像仍将在拍摄时以相机的正确图像方向保存,因此在保存图像或对其执行任何操作之前,您必须通过手动反向消除应用的方向变换:
-(UIImage *)turnMeAround:(UIImage *)image{
CGAffineTransform transform = CGAffineTransformIdentity;
CGFloat scale = [[UIScreen mainScreen] scale]; //retina
CGSize size = CGSizeMake(image.size.width*scale,image.size.height*scale);
switch (image.imageOrientation) {
case UIImageOrientationUp:
return image;
case UIImageOrientationDown:
size = CGSizeMake(size.height,size.width);
transform = CGAffineTransformRotate(transform, M_PI);
break;
case UIImageOrientationLeft:
transform = CGAffineTransformRotate(transform, -M_PI_2);
break;
case UIImageOrientationRight:
transform = CGAffineTransformRotate(transform, M_PI_2);
break;
}
CGContextRef context = CGBitmapContextCreate(NULL, size.width, size.height, CGImageGetBitsPerComponent(image.CGImage), 0, CGImageGetColorSpace(image.CGImage), CGImageGetBitmapInfo(image.CGImage));
CGContextConcatCTM(context, transform);
CGContextDrawImage(context, CGRectMake(0,0,size.width,size.height), image.CGImage);
CGImageRef ref = CGBitmapContextCreateImage(context);
UIImage *upsideRight = [UIImage imageWithCGImage:ref];
CGContextRelease(context);
CGImageRelease(ref);
return upsideRight;
}
非常感谢大家的帮助,但对我有效的方法如下: 所以我发现罪魁祸首是Xcode的Cocos2D模板。它在RootViewController中生成了以下代码:
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
//
// There are 2 ways to support auto-rotation:
// - The OpenGL / cocos2d way
// - Faster, but doesn't rotate the UIKit objects
// - The ViewController way
// - A bit slower, but the UiKit objects are placed in the right place
//
#if GAME_AUTOROTATION==kGameAutorotationNone
//
// EAGLView won't be autorotated.
// Since this method should return YES in at least 1 orientation,
// we return YES only in the Portrait orientation
//
return ( interfaceOrientation == UIInterfaceOrientationPortrait );
#elif GAME_AUTOROTATION==kGameAutorotationCCDirector
//
// EAGLView will be rotated by cocos2d
//
// Sample: Autorotate only in landscape mode
//
if( interfaceOrientation == UIInterfaceOrientationLandscapeLeft ) {
[[CCDirector sharedDirector] setDeviceOrientation: kCCDeviceOrientationLandscapeRight];
} else if( interfaceOrientation == UIInterfaceOrientationLandscapeRight) {
[[CCDirector sharedDirector] setDeviceOrientation: kCCDeviceOrientationLandscapeLeft];
}
// Since this method should return YES in at least 1 orientation,
// we return YES only in the Portrait orientation
return ( interfaceOrientation == UIInterfaceOrientationPortrait );
#elif GAME_AUTOROTATION == kGameAutorotationUIViewController
//
// EAGLView will be rotated by the UIViewController
//
// Sample: Autorotate only in landscpe mode
//
// return YES for the supported orientations
return ( UIInterfaceOrientationIsLandscape( interfaceOrientation ) );
#else
#error Unknown value in GAME_AUTOROTATION
#endif // GAME_AUTOROTATION
// Shold not happen
return NO;
}
在上述代码中,我更改了以下内容:
return ( UIInterfaceOrientationIsLandscape( interfaceOrientation ) );
为此:
return ( UIInterfaceOrientationIsPortrait( interfaceOrientation ) );
这就解决了问题。您是否以任何方式修改了picker.view.transform?不,我没有。但是我在我的项目中使用Cocos2D模板。你认为这可能在某种程度上导致了问题?
return ( UIInterfaceOrientationIsPortrait( interfaceOrientation ) );