rotate
在iOS中横竖屏旋转存在比较多的方案，该方案是一种让预览视图与手机相对静止的方案，用户体验会比较好，具体效果请参考2.0.3之后的demo
-
无论横屏还是竖屏，默认app方向是portrait，建议使用UINavigationController作为winow的根控制器，使用topVC的Autorotate来管理app的旋转模式和支持的方向
-
建议在预览视图所在控制器创建一个父类容器_bgView，用于_kit.preview的size进行参考
-
viewWillAppear:方法中初始化好_bgView的frame和transform方向（支持横屏推流必须初始化）并设置好推流对象_kit的videoOrientation
-
在_bgView上开启预览
-
旋转时，在系统的旋转回调方法中进行_bgView的旋转（若版本低于8.0，需要适配8.0及8.0之前，在demo中两种方法都提供了）
其中推流预览所在控制器为streamerVC，推流对象为_kit
- 在预览所在控制器对象streamerVC中:
创建推流对象_kit,并初始化预览父控件_bgView
- (void)viewDidLoad {
if (self.kit == nil){
_kit = [[KSYGPUStreamerKit alloc] initWithDefaultCfg];
}
}
在viewWillAppear:中根据状态栏方向初始化预览的_bgView，设置videoOrientation并开启预览
- (void)viewWillAppear:(BOOL)animated{
[super viewWillAppear:animated];
[self layoutPreviewBgView];
if (_kit) { // init with default filter
_kit.videoOrientation = [[UIApplication sharedApplication] statusBarOrientation];
[_kit setupFilter:self.ksyFilterView.curFilter];
[_kit startPreview:_bgView];
}
}
- (void)layoutPreviewBgView{
_bgView = [[UIView alloc] initWithFrame:self.view.bounds];
[self.view addSubview:_bgView];
// size
CGFloat minLength = MIN(_bgView.frame.size.width, _bgView.frame.size.height);
CGFloat maxLength = MAX(_bgView.frame.size.width, _bgView.frame.size.height);
CGRect newFrame;
// frame
CGAffineTransform newTransform;
UIInterfaceOrientation currentInterfaceOrientation = [UIApplication sharedApplication].statusBarOrientation;
if (currentInterfaceOrientation == UIInterfaceOrientationPortrait) {
newTransform = CGAffineTransformIdentity;
newFrame = CGRectMake(0, 0, minLength, maxLength);
} else {
newTransform = CGAffineTransformMakeRotation(M_PI_2*(currentInterfaceOrientation == UIInterfaceOrientationLandscapeLeft ? 1 : -1));
newFrame = CGRectMake(0, 0, maxLength, minLength);
}
_bgView.transform = newTransform;
_bgView.frame = newFrame;
}
当window旋转或改变控制器的size时，需要在回调方法里对_bgView进行调整
- (void)viewWillTransitionToSize:(CGSize)size withTransitionCoordinator:(id<UIViewControllerTransitionCoordinator>)coordinator NS_AVAILABLE_IOS(8_0)
{
[super viewWillTransitionToSize:size withTransitionCoordinator:coordinator];
// size
CGSize screenSize = [UIScreen mainScreen].bounds.size;
CGFloat minLength = MIN(screenSize.width, screenSize.height);
CGFloat maxLength = MAX(screenSize.width, screenSize.height);
CGRect newFrame;
// frame
CGAffineTransform newTransform;
// need stay frame after animation
CGAffineTransform newTransformOfStay;
// whether need to stay
__block BOOL needStay = NO;
UIInterfaceOrientation currentInterfaceOrientation = [UIApplication sharedApplication].statusBarOrientation;
UIDeviceOrientation toDeviceOrientation = [UIDevice currentDevice].orientation;
if (toDeviceOrientation == UIDeviceOrientationPortrait) {
newTransform = CGAffineTransformIdentity;
newFrame = CGRectMake(0, 0, minLength, maxLength);
} else {
if (currentInterfaceOrientation == UIInterfaceOrientationPortrait) {
newTransform = CGAffineTransformMakeRotation(M_PI_2*(toDeviceOrientation == UIDeviceOrientationLandscapeRight ? 1 : -1));
} else {
needStay = YES;
if (currentInterfaceOrientation == UIInterfaceOrientationLandscapeLeft) {
newTransform = CGAffineTransformRotate(self.bgView.transform, M_PI * 1.00001);
newTransformOfStay = CGAffineTransformRotate(self.bgView.transform, M_PI);
}else{
newTransform = CGAffineTransformRotate(self.bgView.transform, SYSTEM_VERSION_GE_TO(@"8.0") ? 1.00001 * M_PI : M_PI * 0.99999);
newTransformOfStay = CGAffineTransformRotate(self.bgView.transform, M_PI);
}
}
newFrame = CGRectMake(0, 0, maxLength, minLength);
}
__weak typeof(self) weakSelf = self;
[coordinator animateAlongsideTransition:^(id<UIViewControllerTransitionCoordinatorContext> _Nonnull context) {
__strong __typeof(weakSelf) strongSelf = weakSelf;
if (!strongSelf) {
return ;
}
strongSelf.bgView.transform = newTransform;
strongSelf.bgView.frame = newFrame;
} completion:^(id<UIViewControllerTransitionCoordinatorContext> _Nonnull context) {
__strong __typeof(weakSelf)strongSelf = weakSelf;
if (!strongSelf) {
return ;
}
if (needStay) {
strongSelf.bgView.transform = newTransformOfStay;
strongSelf.bgView.frame = newFrame;
needStay = NO;
}
}];
}
适配8.0之前
- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration{
[super willRotateToInterfaceOrientation:toInterfaceOrientation duration:duration];
// size
CGSize screenSize = [UIScreen mainScreen].bounds.size;
CGFloat minLength = MIN(screenSize.width, screenSize.height);
CGFloat maxLength = MAX(screenSize.width, screenSize.height);
CGRect newFrame;
// frame
CGAffineTransform newTransform;
// need stay frame after animation
CGAffineTransform newTransformOfStay;
// whether need to stay
__block BOOL needStay = NO;
if (toInterfaceOrientation == UIInterfaceOrientationPortrait) {
newTransform = CGAffineTransformIdentity;
newFrame = CGRectMake(0, 0, minLength, maxLength);
} else {
if (self.interfaceOrientation == UIInterfaceOrientationPortrait) {
newTransform = CGAffineTransformMakeRotation(M_PI_2*(toInterfaceOrientation == UIInterfaceOrientationLandscapeLeft ? 1 : -1));
} else {
needStay = YES;
if (self.interfaceOrientation == UIInterfaceOrientationLandscapeLeft) {
newTransform = CGAffineTransformRotate(self.bgView.transform,M_PI * 1.00001);
newTransformOfStay = CGAffineTransformRotate(self.bgView.transform, M_PI);
}else{
newTransform = CGAffineTransformRotate(self.bgView.transform,SYSTEM_VERSION_GE_TO(@"8.0") ? 1.00001 * M_PI : M_PI * 0.99999);
newTransformOfStay = CGAffineTransformRotate(self.bgView.transform, M_PI);
}
}
newFrame = CGRectMake(0, 0, maxLength, minLength);
}
__weak typeof(self) weakSelf = self;
[UIView animateWithDuration:duration animations:^{
__strong __typeof(weakSelf) strongSelf = weakSelf;
// sometimes strongSelf can be nil in iOS version 7.0
if (!strongSelf) {
return ;
}
strongSelf.bgView.transform = newTransform;
strongSelf.bgView.frame = newFrame;
}completion:^(BOOL finished) {
__strong __typeof(weakSelf)strongSelf = weakSelf;
if (!strongSelf) {
return ;
}
if (needStay) {
strongSelf.bgView.transform = newTransformOfStay;
strongSelf.bgView.frame = newFrame;
needStay = NO;
}
}];
}
