iOS 7上portrait landscape要如何在不同分頁上，做不同的設定。

為了這個螢幕轉方向的問題，弄了好久才找到最佳解法，之前用了一個比較蠢的解法，就是設定一個事件去監聽轉換的方向，然後開始針對不同版面進行為整形....一個版面刻了兩個小時，就是為了橫向直向都要可以，一整個累.....如果有需求的，可以參考一下這個方法，雖然我覺得沒有很好，請注意這邊的做法確定在ios6、ios7上確實可行，但在ios5以下版本，我就不敢確定了，我就先來說明這個方法。

Step1：宣告一個監聽事件，監聽UIDeviceOrientationDidChangeNotification方向轉換

[[NSNotificationCenter defaultCenter] addObserver:self

                                          selector:@selector(orientationChanged:)

                                    name:UIDeviceOrientationDidChangeNotification

                                               object:nil];

Step2：撰寫function orientationChanged，針對不同規格刻版面。

- (void)orientationChanged:(NSNotification *)notification
{
    CGFloat img_x=0.0f,img_y=65.0f,img_width=320.0f,img_height=40.0f;
    CGFloat Seg_x=10.0f,Seg_y=70.0f,Seg_width=300.0f,Seg_height=30.0f;

    UIDeviceOrientation deviceOrientation = [UIDevice currentDevice].orientation;

    if ( UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad ){

         NSLog(@"ipad");
        if (UIDeviceOrientationIsLandscape(deviceOrientation))
        {
            //do something is Landscape
            img_x=0.0f,img_y=65.0f,img_width=1024.0f,img_height=50.0f;
            Seg_x=253.0f,Seg_y=75.0f,Seg_width=500.0f,Seg_height=30.0f;

            if (debug) NSLog(@"UIDeviceOrientationIsLandscape");

            imageView.frame=CGRectMake(img_x,img_y,img_width,img_height);
            mySegmentedControl.frame=CGRectMake(Seg_x,Seg_y,Seg_width,Seg_height);
        }
        else if (UIDeviceOrientationIsPortrait(deviceOrientation))
        {
            //do something is Portrait
            img_x=0.0f,img_y=65.0f,img_width=768.0f,img_height=50.0f;
            Seg_x=130.0f,Seg_y=75.0f,Seg_width=500.0f,Seg_height=30.0f;

            if (debug) NSLog(@"UIDeviceOrientationIsPortrait");

            imageView.frame=CGRectMake(img_x,img_y,img_width,img_height);
            mySegmentedControl.frame=CGRectMake(Seg_x,Seg_y,Seg_width,Seg_height);
        }

    }else if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone){

        NSLog(@"iphone");
        if (UIDeviceOrientationIsLandscape(deviceOrientation))
        {

            //do something is Landscape

            img_x=0.0f,img_y=53.5f,img_width=568.0f,img_height=40.0f;
            Seg_x=138.0f,Seg_y=60.0f,Seg_width=300.0f,Seg_height=30.0f;

            if (debug) NSLog(@"UIDeviceOrientationIsLandscape");

            imageView.frame=CGRectMake(img_x,img_y,img_width,img_height);
            mySegmentedControl.frame=CGRectMake(Seg_x,Seg_y,Seg_width,Seg_height);
        }
        else if (UIDeviceOrientationIsPortrait(deviceOrientation))
        {

            //do something is Portrait

            img_x=0.0f,img_y=65.5f,img_width=320.0f,img_height=40.0f;
            Seg_x=10.0f,Seg_y=70.0f,Seg_width=300.0f,Seg_height=30.0f;

            if (debug) NSLog(@"UIDeviceOrientationIsPortrait");

            if (deviceOrientation==UIDeviceOrientationPortraitUpsideDown){

                img_x=0.0f,img_y=53.5f,img_width=568.0f,img_height=40.0f;
                Seg_x=138.0f,Seg_y=60.0f,Seg_width=300.0f,Seg_height=30.0f;
            }
            imageView.frame=CGRectMake(img_x,img_y,img_width,img_height);
            mySegmentedControl.frame=CGRectMake(Seg_x,Seg_y,Seg_width,Seg_height);
        }
    }

    

}

另外一種做法，可以說是比較懶惰的做法，只要刻一個版面就好，可以針對不同需求來作設定。
我想大家都應該知道ios6以上針對版面的轉換，已經更新了函式，現在是

- (BOOL)shouldAutorotate
{

    //returns true if want to allow orientation change

    return NO;

}
- (NSUInteger)supportedInterfaceOrientations
{

    //decide number of origination tob supported by Viewcontroller.

    return UIInterfaceOrientationMaskAll;

}
- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation {

    //from here you Should try to Preferred orientation for ViewController

    return UIInterfaceOrientationPortrait;

}
但是呢？如果你用stroyboard來做版面的時候，會發現，似乎沒辦法針對每個版面進行不同的設定，例如你要再navigation controller 將 portrait 轉成 landscape，這個意思是第一個版面是portrait，第二個頁面是landscape，這樣就會遇到了困難，這樣怎麼解決呢？

Step1：在AppDelegate內的@end後加入下面程式碼


@implementation UINavigationController (Rotation_IOS6)

-(BOOL)shouldAutorotate
{

    //NSLog(@"shouldAutorotate");

    return [[self.viewControllers lastObject] shouldAutorotate];

}

-(NSUInteger)supportedInterfaceOrientations
{

    //NSLog(@"supportedInterfaceOrientations");

    return [[self.viewControllers lastObject] supportedInterfaceOrientations];

}

- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation
{

    //NSLog(@"preferredInterfaceOrientationForPresentation");

    return [[self.viewControllers lastObject] preferredInterfaceOrientationForPresentation];

}

@end

Step2：在你要的頁面中加入上述的函式即可

- (BOOL)shouldAutorotate

{

    //returns true if want to allow orientation change

    return NO;

}

- (NSUInteger)supportedInterfaceOrientations

{

    //decide number of origination tob supported by Viewcontroller.

    return UIInterfaceOrientationMaskAll;

}

- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation {

    //from here you Should try to Preferred orientation for ViewController

    return UIInterfaceOrientationPortrait;

}