iOS 屏幕方向那点事儿
http://zhenby.com/blog/2013/08/20/talk-ios-orientation/

针对当前的屏幕方向进行对应的代码布局

BIDViewController.m

#import "BIDViewController.h"

@interface BIDViewController ()
@end
@implementation BIDViewController
- (void)viewDidLoad

{

    [super viewDidLoad];

    // Do any additional setup after loading the view, typically from a nib.

    UIApplication *app = [UIApplication sharedApplication];    // 获取单例UIApplication

    UIInterfaceOrientation currentOrientation = app.statusBarOrientation;    // 获取当前状态栏的方向

    [self doLayoutForOrientation:currentOrientation];

}
// 用于横纵屏变化的时候的切换用portrait和landscape是两个视图

- (void)willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration {

    [self doLayoutForOrientation:toInterfaceOrientation];

}
- (void)doLayoutForOrientation:(UIInterfaceOrientation)orientation {

    if (UIInterfaceOrientationIsPortrait(orientation)) {    // 屏幕在垂直方向

        _bigButton.frame = CGRectMake(20, 20, 280, 280);    // 重新绘画控件的位置大小

        _actionButton1.frame = CGRectMake(20, 320, 120, 40);

        _actionButton2.frame = CGRectMake(20, 400, 120, 40);

        _actionButton3.frame = CGRectMake(180, 320, 120, 40);

        _actionButton4.frame = CGRectMake(180, 400, 120, 40);

    } else {    // 屏幕在横屏方向

        _bigButton.frame = CGRectMake(20, 20, 260, 260);

        _actionButton1.frame = CGRectMake(320, 20, 120, 40);

        _actionButton2.frame = CGRectMake(320, 90, 120, 40);

        _actionButton3.frame = CGRectMake(320, 160, 120, 40);

        _actionButton4.frame = CGRectMake(320, 230, 120, 40);

    }

}
- (void)didReceiveMemoryWarning

{

    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}
@end

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