方式一
假旋转
- 修改view的transform，通过旋转来实现横屏
工程配置
1530621362531.jpg
重写shouldAutorotate
/*当前需要转屏幕的控制器重写*/
- (BOOL)shouldAutorotate {
return NO;
}
需要注意的是 shouldAutorotate通常会被拦截，比如项目中rootViewCntroller通常为UITabBarController 和 UINavgationController
这时候就需要重写UITabBarController和UINavgationController的shouldAutorotate，找到当前展示/需要转屏幕的控制器（VC），以解决shouldAutorotate被拦截。
采用分类的形式，对于已经成型的项目来说，采用这种方式,下面代码摘取子ZFPlayer
@implementation UITabBarController (ZFPlayerRotation)
+ (void)load {
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
SEL selectors[] = {
@selector(selectedIndex)
};
for (NSUInteger index = 0; index < sizeof(selectors) / sizeof(SEL); ++index) {
SEL originalSelector = selectors[index];
SEL swizzledSelector = NSSelectorFromString([@"zf_" stringByAppendingString:NSStringFromSelector(originalSelector)]);
Method originalMethod = class_getInstanceMethod(self, originalSelector);
Method swizzledMethod = class_getInstanceMethod(self, swizzledSelector);
if (class_addMethod(self, originalSelector, method_getImplementation(swizzledMethod), method_getTypeEncoding(swizzledMethod))) {
class_replaceMethod(self, swizzledSelector, method_getImplementation(originalMethod), method_getTypeEncoding(originalMethod));
} else {
method_exchangeImplementations(originalMethod, swizzledMethod);
}
}
});
}
- (NSInteger)zf_selectedIndex {
NSInteger index = [self zf_selectedIndex];
if (index > self.viewControllers.count) { return 0; }
return index;
}
/**
* If the root view of the window is a UINavigationController, you call this Category first, and then UIViewController called.
* All you need to do is revisit the following three methods on a page that supports directions other than portrait.
*/
// Whether automatic screen rotation is supported.
- (BOOL)shouldAutorotate {
UIViewController *vc = self.viewControllers[self.selectedIndex];
if ([vc isKindOfClass:[UINavigationController class]]) {
UINavigationController *nav = (UINavigationController *)vc;
return [nav.topViewController shouldAutorotate];
} else {
return [vc shouldAutorotate];
}
}
// Which screen directions are supported.
- (UIInterfaceOrientationMask)supportedInterfaceOrientations {
UIViewController *vc = self.viewControllers[self.selectedIndex];
if ([vc isKindOfClass:[UINavigationController class]]) {
UINavigationController *nav = (UINavigationController *)vc;
return [nav.topViewController supportedInterfaceOrientations];
} else {
return [vc supportedInterfaceOrientations];
}
}
// The default screen direction (the current ViewController must be represented by a modal UIViewController (which is not valid with modal navigation) to call this method).
- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation {
UIViewController *vc = self.viewControllers[self.selectedIndex];
if ([vc isKindOfClass:[UINavigationController class]]) {
UINavigationController *nav = (UINavigationController *)vc;
return [nav.topViewController preferredInterfaceOrientationForPresentation];
} else {
return [vc preferredInterfaceOrientationForPresentation];
}
}
@implementation UINavigationController (ZFPlayerRotation)
/**
* If the root view of the window is a UINavigationController, you call this Category first, and then UIViewController called.
* All you need to do is revisit the following three methods on a page that supports directions other than portrait.
*/
// Whether automatic screen rotation is supported
- (BOOL)shouldAutorotate {
NSLog(@"shouldAutorotate %@",@([self.topViewController shouldAutorotate]));
return [self.topViewController shouldAutorotate];
}
// Which screen directions are supported
- (UIInterfaceOrientationMask)supportedInterfaceOrientations {
NSLog(@"supportedInterfaceOrientations %@",@([self.topViewController supportedInterfaceOrientations]));
return [self.topViewController supportedInterfaceOrientations];
}
// The default screen direction (the current ViewController must be represented by a modal UIViewController (which is not valid with modal navigation) to call this method).
- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation {
NSLog(@"preferredInterfaceOrientationForPresentation %@",@([self.topViewController preferredInterfaceOrientationForPresentation]));
return [self.topViewController preferredInterfaceOrientationForPresentation];
}
- (UIViewController *)childViewControllerForStatusBarStyle {
NSLog(@"childViewControllerForStatusBarStyle %@",self.topViewController);
return self.topViewController;
}
- (UIViewController *)childViewControllerForStatusBarHidden {
NSLog(@"childViewControllerForStatusBarHidden %@",self.topViewController);
return self.topViewController;
}
@end
- 原理就是一定要找到当前展示的ViewController，然后 shouldAutorotate == NO
遇到过的坑 （一定要追到shouldAutorotate）
UITabBarController 被包装到了一个UIViewController，成为了这个UIViewController的子控制器，并且 UIViewController == rootViewController
这种结构首先 shouldAutorotate 被UIViewController拦截无法往下传递，所以这时转屏幕无论修改状态栏到什么方向都是不起作用的
必须重写UIViewController 的 shouldAutorotate，然后找到TabBarController->NavgationController->UIViewController
直到找到当前需要转屏的UIViewController，不管控制器结构有多深，都需要一层一层的传递下去
重写supportedInterfaceOrientations
- (UIInterfaceOrientationMask)supportedInterfaceOrientations {
return UIInterfaceOrientationMaskAllButUpsideDown;
}
- 这些都完成以后就可以监听屏幕旋转做相应的处理了
- (void)addDeviceOrientationObserver {
if (![UIDevice currentDevice].generatesDeviceOrientationNotifications) {
[[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];
}
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(handleDeviceOrientationChange) name:UIDeviceOrientationDidChangeNotification object:nil];
}
方式二
强制横屏
- 相对来说方式一体验要好很多，旋转的动画可以自定义
- (void)interfaceOrientation:(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;
// 从2开始是因为0 1 两个参数已经被selector和target占用
[invocation setArgument:&val atIndex:2];
[invocation invoke];
}
}
