iOS中的屏幕的旋轉(UIViewController)橫屏豎屏

RootViewController

//視圖控制器(UIViewController):它不是視圖,用來管理視圖,所以屏幕上看不到,但是自身攜帶一個視圖(根視圖)
#import "RootViewController.h"
#import "LoginView.h"
//視圖控制器的延展
@interface RootViewController ()

@end
//視圖控制器的實現部分
@implementation RootViewController

//用來加載視圖控制器的根視圖,此方法源於父類
- (void)loadView
{
    LoginView *logview = [[LoginView alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    //指定剛才創建的  自定義視圖 對象為當前視圖控制器的根視圖
    self.view = logview;
    
    [logview release];
}

//該方法是在loadView執行完之后立即執行的方法
//當訪問視圖控制器的View為空,一但發現View為空,立即調用loadView來加載根視圖
//如果要自定義視圖控制器的根視圖,只需要重寫loadView方法,在loadView方法中完成創建,並指定當前試圖控制器的根視圖即可
- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    NSLog(@"%s,%d",__FUNCTION__,__LINE__);
   // self.view.backgroundColor = [UIColor redColor];


    
}
#pragma mark -- 檢測和處理屏幕的旋轉
//1.設置屏幕支持的旋轉方向
- (NSUInteger)supportedInterfaceOrientations{
    return UIInterfaceOrientationMaskAll;
    
}
//開始旋轉時會觸發的方法
//經常用來暫停播放器播放,暫停視屏播放,以及關閉用戶交互

- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration{
      [super willRotateToInterfaceOrientation:toInterfaceOrientation duration:duration];
}
//當旋轉結束是時觸發
//繼續音樂,視頻播放,以及打開的用戶交互
- (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation{
    [super didRotateFromInterfaceOrientation:fromInterfaceOrientation];
}

//當將要開始旋轉做動畫時觸發,經常用來在旋轉時添加自定義動畫
- (void)willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration{
    
    
    
    [super willAnimateRotationToInterfaceOrientation:toInterfaceOrientation duration:duration];
    
    
    
}
#pragma ---視圖控制器控制布局視圖的方法
//當視圖旋轉時,視圖控制器觸發的方法,用於重新布局視圖控制器根據視圖上得子視圖
- (void)viewWillLayoutSubviews{
    [super viewWillLayoutSubviews];
}











//當視圖控制器收到內存警告時觸發
//釋放之前未使用的空間,以及可以重建的對象.
- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
    //1.視圖控制器的根視圖是夠已經成功加載
    //2.當前根視圖是否正在顯示
    //[self isViewLoaded]判斷視圖是否成功加載
    //self.view.window,判讀視圖是否在當前界面
    //內存加載成功,且不在當前界面
    if ([self isViewLoaded] && !self.view.window) {
        [self.view release];
    }
}



@end

LoginView.h

#import <UIKit/UIKit.h>

@interface LoginView : UIView
//最簡單的自定義視圖封裝:直接將控件聲明為屬性,在.h中聲明外界訪問的接口.
@property (nonatomic,retain) UILabel *aLabel;
@property (nonatomic, retain)UITextField *textField;
@property (nonatomic, retain)UIButton *loginBtn;
@end

LoginView.m

#import "LoginView.h"
#define kMargin_Left_Label      30
#define kMargin_Top_Label       100
#define kWidth_Label            60
#define kHeight_Label           30
#define kMargin_Left_TextField  (kMargin_Left_Label + kWidth_Label + 20)
#define kMargin_Top_TextField   100
#define kWidth_TextField        150
#define kHeight_TextField       30
#define KMargin_Left_Button     100
#define kmargin_Top_Button      (kMargin_Top_Label + kHeight_Label + 30)
#define kWidth_Button           80
#define kHeight_Button          40
@implementation LoginView


//原則:如果重寫父類繼承來方法是,如果不知道父類對該方法的事項,則調用父類對該方法的實現(super).

- (instancetype)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if(self)
    {
        [self setupLabel];
        
        [self setupButton];
        
        [self setupTextField];
    }
    return self;
}

//用戶名Label
- (void)setupLabel
{
    self.aLabel = [[UILabel alloc] init];
    self.aLabel.text = @"用戶名";
    self.aLabel.frame = CGRectMake(kMargin_Left_Label,kMargin_Top_Label , kWidth_Label, kHeight_Label);
    [self addSubview:self.aLabel];
    [self.aLabel release];
}
//輸入框
- (void)setupTextField{
    self.textField = [[UITextField alloc] init];
    self.textField.placeholder = @"請輸入用戶名";
    self.textField.borderStyle = UITextBorderStyleRoundedRect;
    self.textField.frame = CGRectMake(kMargin_Left_TextField, kMargin_Top_TextField, kWidth_TextField, kHeight_TextField);
    [self addSubview:self.textField];
    [self.textField release];
}
//登陸按鈕
- (void)setupButton
{
    self.loginBtn = [UIButton buttonWithType:UIButtonTypeSystem];
    [self.loginBtn setTitle:@"登陸" forState:UIControlStateNormal];
    self.loginBtn.frame = CGRectMake(KMargin_Left_Button, kmargin_Top_Button, kWidth_Button, kHeight_Button);
    [self addSubview:self.loginBtn];
}

//該方法為視圖的方法,當旋轉時,視圖會自動的調用該方法用來重新布局子視圖.
- (void)layoutSubviews{
    [super layoutSubviews];
    //1.獲取當前屏幕所處的狀態(旋轉方向)
    UIInterfaceOrientation orientation = [UIApplication sharedApplication].statusBarOrientation;
    //2.判斷屏幕方向,調整子視圖
    switch (orientation) {
        case UIInterfaceOrientationPortrait:
          //  NSLog(@"豎屏");
            //break;
            
     
        case UIInterfaceOrientationPortraitUpsideDown:
           // NSLog(@"倒置");
            self.loginBtn.frame = CGRectMake(KMargin_Left_Button, kmargin_Top_Button, kWidth_Button, kHeight_Button);
            break;
        case UIInterfaceOrientationLandscapeLeft:
           // NSLog(@"右橫屏");
            //break;
       
        case UIInterfaceOrientationLandscapeRight:
           // NSLog(@"左橫屏");
             self.loginBtn.frame = CGRectMake(kMargin_Left_TextField + kWidth_TextField + 30, kMargin_Top_Label, kWidth_Button, kHeight_Button);
            break;
        default:
            break;
    }
}

- (void)dealloc
{
    
    [_aLabel release];
    [_textField release];
    [_loginBtn release];
    [super dealloc];
    
}
@end