一、旋转后相对位置不变

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二、旋转后相对位置变化

2.1默认：

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2.2调整后

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三、小结

3.1 在APP级别设置支持哪些方向：

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3.2 在viewController(xlib)级别设置支持哪些方向：

#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.

}

//重写这种方法

-(NSUInteger)supportedInterfaceOrientations

{

//    return (UIInterfaceOrientationMaskPortrait|UIInterfaceOrientationMaskLandscapeLeft|UIInterfaceOrientationMaskPortraitUpsideDown);

//    return UIInterfaceOrientationMaskAll;

    return (UIInterfaceOrientationMaskLandscapeRight|UIInterfaceOrientationMaskLandscapeLeft|UIInterfaceOrientationMaskPortraitUpsideDown);

}

@end

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];

	// 从这里開始

    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.

}

//从这里開始

-(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