屏幕旋轉(zhuǎn)

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有時(shí)候我們需要判斷應(yīng)用程序當(dāng)前的方向，可以通過(guò)獲取設(shè)備當(dāng)前的方向來(lái)確定，從下面的定義你可以看到

<strong>UIInterfaceOrientation</strong>的定義是通過(guò)<strong>UIDeviceOrientation</strong>來(lái)完成的，有兩個(gè)概念：

• UIDeviceOrientation：硬件設(shè)備的方向(設(shè)備的物理方向)
• UIInterfaceOrientation：應(yīng)用程序界面的方向(界面顯示的方向)
• UIInterfaceOrientationMask:應(yīng)用程序屏幕支持的旋轉(zhuǎn)方向

<strong>UIDeviceOrientation:</strong>

UIDeviceOrientation deviceOrientation = [UIDevice currentDevice].orientation;    
if (UIDeviceOrientationIsLandscape(deviceOrientation))   
    NSLog(@"The orientation is landscape");        
else if(UIDeviceOrientationIsPortrait(deviceOrientation))   
    NSLog(@"The orientation is portrait"); 
     

<strong> UIInterfaceOrientation:</strong>

UIInterfaceOrientation orientation =  [UIApplication sharedApplication].statusBarOrientation;
if (orientation== UIInterfaceOrientationLandscapeLeft ||orientation== UIInterfaceOrientationLandscapeRight) {
          NSLog(@"The orientation is landscape");
        }

<strong>UIInterfaceOrientationMask:</strong>

<!--獲取支持旋轉(zhuǎn)方向-->
 UIInterfaceOrientationMask orientationMask =[[UIApplication sharedApplication] supportedInterfaceOrientationsForWindow:[UIApplication sharedApplication].keyWindow];
 <!--設(shè)備是ipad-->
 if ([UIDevice currentDevice].userInterfaceIdiom ==UIUserInterfaceIdiomPad) {
 <!--支持全尺寸旋轉(zhuǎn)-->
        if (orientationMask != UIInterfaceOrientationMaskAll) {
            if (orientation== UIInterfaceOrientationLandscapeLeft ||orientation== UIInterfaceOrientationLandscapeRight) {
                windowframe =CGRectMake(frame.origin.y, frame.origin.x, frame.size.height, frame.size.width);
            }
            
        }
    }

1. 方案一

設(shè)置不可旋轉(zhuǎn)
設(shè)置不支持屏幕旋轉(zhuǎn)，并設(shè)置默認(rèn)方向?yàn)檎７聪?。設(shè)置后會(huì)發(fā)現(xiàn)，凡是添加到根控制器的視圖控制器都不再支持左右橫屏

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation
{
    return (toInterfaceOrientation == UIInterfaceOrientationPortrait);
}
- (BOOL)shouldAutorotate
{
    return NO;
}
- (NSUInteger)supportedInterfaceOrientations
{
    return UIInterfaceOrientationMaskPortrait;//只支持這一個(gè)方向(正常的方向)
}

/**重點(diǎn)：
根控制器的位置：
1.如果在UIViewController上，則在UIViewController對(duì)應(yīng)的.m文件中加入三個(gè)函數(shù)即可。
2.如果在UITabBarController上，則在UITabBarController對(duì)應(yīng)的.m文件中加入三個(gè)函數(shù)即可。
3.如果在UINavigationController上，則在UINavigationController對(duì)應(yīng)的.m文件中加入三個(gè)函數(shù)即可。

(不按情況執(zhí)行，問(wèn)題無(wú)法解決)
*/

在需要橫屏的控制器執(zhí)行左右橫屏

- (BOOL)shouldAutorotate
{
    return Yes;
}
- (UIInterfaceOrientationMask)supportedInterfaceOrientations
{
    return UIInterfaceOrientationMaskPortrait | UIInterfaceOrientationMaskLandscape;
}

2.方案二

以導(dǎo)航控制器為跟控制器為例：

#pragma 橫豎屏
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation
{
    if ([self.topViewController isKindOfClass:[MPMoviePlayerViewController class]] || [self.presentedViewController isKindOfClass:[MPMoviePlayerViewController class]]) { 
        return YES;
    }
    return (toInterfaceOrientation == UIInterfaceOrientationMaskPortrait);
}
- (BOOL)shouldAutorotate
{
    if ([self.topViewController isKindOfClass:[MPMoviePlayerViewController class]] || [self.presentedViewController isKindOfClass:[MPMoviePlayerViewController class]]) {
        return YES;
    }
    return NO;
}
- (UIInterfaceOrientationMask)supportedInterfaceOrientations
{
    if ([self.topViewController isKindOfClass:[MPMoviePlayerViewController class]] || [self.presentedViewController isKindOfClass:[MPMoviePlayerViewController class]]) {
         return UIInterfaceOrientationMaskPortrait | UIInterfaceOrientationMaskLandscape;
    }
    return UIInterfaceOrientationMaskPortrait;
}

3.方案三 強(qiáng)制橫豎屏

私有方法 無(wú)法通過(guò)APPStore審核
這是網(wǎng)絡(luò)上可以查到的一般解決方法，用在iPhone上的APP上效果顯著。不過(guò)，如果你用iPad上運(yùn)行項(xiàng)目后會(huì)發(fā)現(xiàn)，需求還沒(méi)有完成。在iPad上處于橫屏的狀態(tài)下運(yùn)行的應(yīng)用程序，會(huì)發(fā)現(xiàn)應(yīng)用里的視圖是橫屏顯示的。這時(shí)，根控制器默認(rèn)是不支持屏幕旋轉(zhuǎn)的，所以整個(gè)APP一直處于橫屏狀態(tài)。當(dāng)然，實(shí)現(xiàn)的MPMoviePlayerViewController子類還是可以正常旋轉(zhuǎn)的。所以，我們只要將應(yīng)用在iPad上橫屏狀態(tài)下，也能以正常豎屏方向進(jìn)入應(yīng)用就OK了！

/**
  *強(qiáng)制轉(zhuǎn)成豎屏:
  */
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 = UIInterfaceOrientationPortrait;
            [invocation setArgument:&val atIndex:2];
            [invocation invoke];
 }

/**
     *  強(qiáng)制豎屏
     */
    NSArray * selectorNameCharacterArray = @[@"s",@"e",@"t",@"O",@"r",@"i",@"e",@"n",@"t",@"a",@"t",@"i",@"o",@"n",@":"];
    NSString * selectorName = [selectorNameCharacterArray componentsJoinedByString:@""];
    SEL selector = NSSelectorFromString(selectorName);
    if ([[UIDevice currentDevice] respondsToSelector:selector]) {
        NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:[UIDevice instanceMethodSignatureForSelector:selector]];
        [invocation setSelector:selector];
        [invocation setTarget:[UIDevice currentDevice]];
        int val = UIInterfaceOrientationPortrait;
        [invocation setArgument:&val atIndex:2];
        [invocation invoke];
    }

4. 方案四 通過(guò)判斷狀態(tài)來(lái)控制

- (void)deviceOrientationDidChange: (NSNotification *)notification
{
    UIInterfaceOrientation interfaceOrientation = [[UIApplication sharedApplication] statusBarOrientation];
    CGFloat startRotation = [[self valueForKeyPath:@"layer.transform.rotation.z"] floatValue];
    CGAffineTransform rotation;
    switch (interfaceOrientation) {
        case UIInterfaceOrientationLandscapeLeft:
            rotation = CGAffineTransformMakeRotation(-startRotation + M_PI * 270.0 / 180.0);
            break;
        case UIInterfaceOrientationLandscapeRight:
            rotation = CGAffineTransformMakeRotation(-startRotation + M_PI * 90.0 / 180.0);
            break;
        case UIInterfaceOrientationPortraitUpsideDown:
            rotation = CGAffineTransformMakeRotation(-startRotation + M_PI * 180.0 / 180.0);
            break;
        default:
            rotation = CGAffineTransformMakeRotation(-startRotation + 0.0);
            break;
    }
    view.transform = rotation;
}

應(yīng)用在iPad的上運(yùn)行時(shí)，所有視圖都只會(huì)支持豎屏方向，為了讓視頻播放的視圖能夠支持橫豎屏旋轉(zhuǎn)，需要用到變換屬性來(lái)模擬系統(tǒng)的橫豎屏效果。

這里是建立在方案二的基礎(chǔ)上實(shí)現(xiàn)的

#pragma 橫豎屏
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation
{
    if ([self.topViewController isKindOfClass:[MPMoviePlayerViewController class]] || [self.presentedViewController isKindOfClass:[MPMoviePlayerViewController class]]) { 
        return YES;
    }
    return (toInterfaceOrientation == UIInterfaceOrientationMaskPortrait);
}
- (BOOL)shouldAutorotate
{
    if ([self.topViewController isKindOfClass:[MPMoviePlayerViewController class]] || [self.presentedViewController isKindOfClass:[MPMoviePlayerViewController class]]) { 
        return YES;
    }
    return NO;
}
- (UIInterfaceOrientationMask)supportedInterfaceOrientations
{
    if ([self.topViewController isKindOfClass:[MPMoviePlayerViewController class]] || [self.presentedViewController isKindOfClass:[MPMoviePlayerViewController class]]) {
        if (iPad) {
            UIDeviceOrientation deviceOrientation = [UIDevice currentDevice].orientation;
            if (UIDeviceOrientationIsLandscape(deviceOrientation)){
                switch (deviceOrientation) {
                    case 3:
                    {
                        [UIView beginAnimations:nil context:nil];
                        [UIView setAnimationDuration:0.5];
                        self.presentedViewController.view.bounds = CGRectMake(0, 0, self.view.frame.size.height, self.view.frame.size.width);
                        self.presentedViewController.view.transform = CGAffineTransformMakeRotation(-M_PI*1.5);
                        [UIView commitAnimations];
                        [USER_DEFAULTS setValue:@(deviceOrientation) forKey:@"deviceOrientation"];
                    }
                        break;
                    case 4:
                    {
                        [UIView beginAnimations:nil context:nil];
                        [UIView setAnimationDuration:0.5];
                        self.presentedViewController.view.bounds = CGRectMake(0, 0, self.view.frame.size.height, self.view.frame.size.width);
                        self.presentedViewController.view.transform = CGAffineTransformMakeRotation(M_PI*1.5);
                        [UIView commitAnimations];
                        [USER_DEFAULTS setValue:@(deviceOrientation) forKey:@"deviceOrientation"];

                    }
                        break;
                    default:
                        break;
                }
            }else{
                [UIView beginAnimations:nil context:nil];
                [UIView setAnimationDuration:0.5];
                self.presentedViewController.view.bounds = CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height);
                self.presentedViewController.view.transform = CGAffineTransformMakeRotation(0);
                [USER_DEFAULTS setValue:@(deviceOrientation) forKey:@"deviceOrientation"];
                [UIView commitAnimations];

            }
        }
                return UIInterfaceOrientationMaskPortrait | UIInterfaceOrientationMaskLandscape;
    }
    return UIInterfaceOrientationMaskPortrait;
}