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

一、旋转后相对位置不变









二、旋转后相对位置变化

 2.1默认：







 2.2调整后









三、小结

 3.1 在APP级别设置支持哪些方向：



 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.
}

//重写这个方法
-(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