一、旋轉後相對位置不變

二、旋轉後相對位置變化

2.1默認：

2.2調整後

三、小結

3.1 在APP級別設置支持哪些方向：

3.2 在viewController(xlib)級別設置支持哪些方向：

#import "JAViewController.h"

@interface JAViewController ()

@end

@implementation JAViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
	// Do any additional setup after loading the view, typically from a nib.
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

//重寫這種方法
-(NSUInteger)supportedInterfaceOrientations
{
//    return (UIInterfaceOrientationMaskPortrait|UIInterfaceOrientationMaskLandscapeLeft|UIInterfaceOrientationMaskPortraitUpsideDown);
//    return UIInterfaceOrientationMaskAll;
    return (UIInterfaceOrientationMaskLandscapeRight|UIInterfaceOrientationMaskLandscapeLeft|UIInterfaceOrientationMaskPortraitUpsideDown);
}

@end

3.4 當上面的Contraints辦法滿足不了時，關閉掉它，讓後在ViewController.m中通過代碼實現。

//
//  JAViewController.m
//  Restructure
//
//  Created by jason on 14-7-16.
//  Copyright (c) 2014年 jason. All rights reserved.
//

#import "JAViewController.h"

@interface JAViewController ()
@property (weak, nonatomic) IBOutlet UIButton *actionButton1;
@property (weak, nonatomic) IBOutlet UIButton *actionButton2;
@property (weak, nonatomic) IBOutlet UIButton *actionButton3;
@property (weak, nonatomic) IBOutlet UIButton *actionButton4;
@property (weak, nonatomic) IBOutlet UIView *contentView;

@end

@implementation JAViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
	// 從這裏開始
    UIApplication *app = [UIApplication sharedApplication];
    UIInterfaceOrientation currentOrientation = app.statusBarOrientation;
    [self doLayoutForOrientation:currentOrientation];//跳轉到實際處理處
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

//從這裏開始
-(void)willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration
  {
      [self doLayoutForOrientation:toInterfaceOrientation];
  }

//確定當前方向
-(void)doLayoutForOrientation:(UIInterfaceOrientation)orientation
{
    if (UIInterfaceOrientationIsPortrait(orientation)) {
        [self layoutPortrait];
    } else {
        [self layoutLandscape];
    }
}

static const CGFloat buttonHeight = 40;
static const CGFloat buttonWidth = 120;
static const CGFloat spacing = 20;

//豎向處理
- (void)layoutPortrait {
    CGRect b = self.view.bounds;
    CGFloat contentWidth = CGRectGetWidth(b) - (2 * spacing);
    CGFloat contentHeight = CGRectGetHeight(b) - (4 * spacing) -
    (2 * buttonHeight);
    self.contentView.frame = CGRectMake(spacing, spacing,
                                        contentWidth, contentHeight);
    CGFloat buttonRow1y = contentHeight + (2 * spacing);
    CGFloat buttonRow2y = buttonRow1y + buttonHeight +  spacing;
    CGFloat buttonCol1x = spacing;
    CGFloat buttonCol2x = CGRectGetWidth(b) - buttonWidth - spacing;
    self.actionButton1.frame = CGRectMake(buttonCol1x, buttonRow1y,
                                          buttonWidth, buttonHeight);
    self.actionButton2.frame = CGRectMake(buttonCol2x, buttonRow1y,
                                          buttonWidth, buttonHeight);
    self.actionButton3.frame = CGRectMake(buttonCol1x, buttonRow2y,
                                          buttonWidth, buttonHeight);
    self.actionButton4.frame = CGRectMake(buttonCol2x, buttonRow2y,
                                          buttonWidth, buttonHeight);
}

//橫向處理
- (void)layoutLandscape {
    CGRect b = self.view.bounds;
    CGFloat contentWidth = CGRectGetWidth(b) - buttonWidth - (3 * spacing);
    CGFloat contentHeight = CGRectGetHeight(b) - (2 * spacing);
    self.contentView.frame = CGRectMake(spacing, spacing,
                                        contentWidth, contentHeight);
    CGFloat buttonX = CGRectGetWidth(b) - buttonWidth - spacing;
    CGFloat buttonRow1y = spacing;
    CGFloat buttonRow4y = CGRectGetHeight(b) - buttonHeight - spacing;
    CGFloat buttonRow2y = buttonRow1y + floor((buttonRow4y - buttonRow1y)
                                              * 0.333);
    CGFloat buttonRow3y = buttonRow1y + floor((buttonRow4y - buttonRow1y)
                                              * 0.667);
    self.actionButton1.frame = CGRectMake(buttonX, buttonRow1y,
                                          buttonWidth, buttonHeight);
    self.actionButton2.frame = CGRectMake(buttonX, buttonRow2y,
                                          buttonWidth, buttonHeight);
    self.actionButton3.frame = CGRectMake(buttonX, buttonRow3y,
                                          buttonWidth, buttonHeight);
    self.actionButton4.frame = CGRectMake(buttonX, buttonRow4y,
                                          buttonWidth, buttonHeight);
}

@end

【 Beginning iOS 7 Development《精通iOS7開發》】05 Autorotation and Autosizing