一、旋转后相对位置不变

<img src=http://www.mamicode.com/"http://img.blog.csdn.net/20140716104252587?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvZ29nbGVy/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center" alt="" />

       3.3 使用约束Contstraints

    3.4 当上面的Contraints办法满足不了时，关闭掉它，让后在ViewController.m中通过代码实现。

//
//  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];
	// 从这里开始
    UIApplication *app = [UIApplication sharedApplication];
    UIInterfaceOrientation currentOrientation = app.statusBarOrientation;
    [self doLayoutForOrientation:currentOrientation];//跳转到实际处理处
}

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

//从这里开始
-(void)willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration
  {
      [self doLayoutForOrientation:toInterfaceOrientation];
  }

//确定当前方向
-(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;

//竖向处理
- (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);
}

//横向处理
- (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