何以解忧，唯有努力
前言
今天不是个好日子，为一个屏幕强制旋转搞的天昏地暗...
一开始，我满怀信心的挪了几行代码过来
- (BOOL) shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation
{
return (toInterfaceOrientation == self.preferredInterfaceOrientationForPresentation);
}
- (BOOL) shouldAutorotate
{
// (iOS 6)
// Only auto rotate if we're on the screen (see above)
return NO;
}
- (NSUInteger)supportedInterfaceOrientations
{
return UIInterfaceOrientationMaskLandscape;
}
- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation
{
// (iOS 6)
// Prefer (force) landscape
return UIInterfaceOrientationLandscapeRight;
}
然而，事事尽不如人意，不得行。
于是不得不开始查找资料，然而在网上找了许多资料后，发现几乎都是一样的..跑起来效果也差强人意，话不多说，直接上最后解决方法，是针对push的，present这种比较好实现，这里就不写了。
方案
12.png
- 先在工程中进行如此配置（工程需要指出竖屏+某些界面的强制横屏）
- 由于是
push，所以我们需要在自定义的NavigationController中进行如下设置，MainViewController为我们需要强制横屏的vc
@interface MyNavigationController ()
@end
@implementation MyNavigationController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (UIInterfaceOrientationMask)supportedInterfaceOrientations {
if ([self.topViewController isKindOfClass:[MainViewController class]]){
return [self.topViewController supportedInterfaceOrientations];
}
return UIInterfaceOrientationMaskPortrait;
}
- (BOOL)shouldAutorotate{
if ([self.topViewController isKindOfClass:[MainViewController class]]){
return [self.topViewController shouldAutorotate];
}
return NO;
}
@end
- 在需要选择的
vc中添加如下代码
- (void)viewWillAppear:(BOOL)animated {
[super viewWillAppear:animated];
[self orientationToPortrait:UIInterfaceOrientationLandscapeLeft];
}
- (void)viewWillDisappear:(BOOL)animated {
[super viewWillDisappear:animated];
}
#pragma mark ==强制横屏
- (UIInterfaceOrientationMask)supportedInterfaceOrientations {
return UIInterfaceOrientationMaskAllButUpsideDown;
}
- (void)orientationToPortrait:(UIInterfaceOrientation)orientation {
if([[UIDevice currentDevice] respondsToSelector:@selector(setOrientation:)]) {
SEL selector = NSSelectorFromString(@"setOrientation:");
NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:[UIDevice instanceMethodSignatureForSelector:selector]];
[invocation setSelector:selector];
[invocation setTarget:[UIDevice currentDevice]];
int val = orientation;
[invocation setArgument:&val atIndex:2];
[invocation invoke];
}
}
//设置为允许旋转
- (BOOL)shouldAutorotate {
return YES;
}
- (void)viewWillTransitionToSize:(CGSize)size withTransitionCoordinator:(id<UIViewControllerTransitionCoordinator>)coordinator{
[super viewWillTransitionToSize:size withTransitionCoordinator:coordinator];
}
上面supportedInterfaceOrientations方法中的返回值其实也可以设置成你需要的横屏方式，我这设置的只不过还包括了竖屏而已，shouldAutorotate这个是必须要的，不然你在设置横屏的时候将会无效，viewWillTransitionToSize这个函数不是旋转需要加的，我在这里写出来是为了方便在旋转后进行界面UI的调整，size的大小你会发现长宽变成了旋转之前的宽长
- 如何在返回的时候调整为竖屏呢？
一开始我是打算在viewWillDisappear中继续调用orientationToPortrait方法，只不过参数为竖屏的值，然而并没有什么用...
为了解决这个问题，目前我的解决办法就是在push前的页面中也来实现改方法，只不过在viewWillAppear中调用的方法为[self orientationToPortrait:UIInterfaceOrientationPortrait]
由于时间紧迫就不在仔细去研究了，希望有更好的方案的朋友多多指教~
