iPhone 纵向/横向和坐标系

Posted 2023-03-10

【中文标题】iPhone 纵向/横向和坐标系

【英文标题】：iPhone Portrait/Landscape and Coordinate System

【发布时间】：2013-10-07 19:23:42

【问题描述】：

我真的很难弄清楚如何处理旋转。我在这里阅读了许多帖子，但无法以正确的方式将项目添加到横向屏幕并位于正确的位置。

例如，我有一个纵向视图 (320x480)，并在位置 (0,0) 创建了一个大按钮。我希望它会出现在左上角。

当我将设备顺时针旋转到横向 (480x320) 时，我希望坐标 (0,0) 也位于左上角 - 但事实并非如此。我的按钮错误地出现在右上角，并且按钮上的文本从屏幕向下而不是横向/最宽方向。

我将附上我的（凌乱的）代码，希望它能够阐明我正在尝试做的事情。

假设我可以使用设备旋转坐标系，以便坐标系在横向模式下变为 480x320，左上角为 0,0，我错了吗？如果我没记错的话..我该如何实现？

#include "ContainerVC.h"

@interface UIApplication (AppDimensions)

+(CGSize) currentSize;
+(CGSize) sizeInOrientation:(UIInterfaceOrientation)orientation;

@end


@implementation UIApplication (AppDimensions)


+(CGSize) currentSize

  return [UIApplication sizeInOrientation:[UIApplication sharedApplication].statusBarOrientation];


+(CGSize) sizeInOrientation:(UIInterfaceOrientation)orientation

  CGSize size = [UIScreen mainScreen].bounds.size;

  UIApplication *application = [UIApplication sharedApplication];

  if( UIInterfaceOrientationIsLandscape( orientation ) )
  
    size = CGSizeMake(size.height, size.width);
  

  if (application.statusBarHidden == NO)
    size.height -= MIN(application.statusBarFrame.size.width, application.statusBarFrame.size.height);

  return size;



@end



@interface ContainerVC ()

@end

@implementation ContainerVC

int      g_MaxPixelHeight;
int      g_MaxPixelWidth;

-(void) addMyContent

  // TEST BUTTON !!
  UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
  button.frame = CGRectMake( 0, 0, 200, 200 );

  [button setBackgroundColor: [UIColor redColor]];

    // Configure title(s)
  button.titleLabel.lineBreakMode = UILineBreakModeWordWrap;
  button.titleLabel.textAlignment = UITextAlignmentCenter;

    [button setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
    [button setTitleShadowColor:[UIColor colorWithRed:.25 green:.25 blue:.25 alpha:1] forState:UIControlStateNormal];
    [button setTitleShadowOffset:CGSizeMake(0, -1)];
    [button setFont:[UIFont boldSystemFontOfSize:40]];

  [button setTitle: @"TITLE" forState:UIControlStateNormal];

  [self.view addSubview:button];
  return;


-(void) loadView

  // PDS> Stack overflow says don't call this but I get errors if I don't!!
  [super loadView];



-(void) viewDidLoad

  NSLog( @"** VIEW DID LOAD" );

  [super viewDidLoad];

  g_ContainerVC = self;

  [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector( didRotate: ) name:@"UIDeviceOrientationDidChangeNotification" object:nil];


- (BOOL)canBecomeFirstResponder

  return YES;


-(void) viewDidAppear:(BOOL)animated

  NSLog( @"** VIEW DID APPEAR" );  

  [super viewDidAppear:animated];

  [self becomeFirstResponder];


-(void) viewWillDisappear:(BOOL)animated
  
  [self resignFirstResponder];

  [super viewWillDisappear:animated];


-(void) viewWillAppear: (BOOL) animated

  [[NSNotificationCenter defaultCenter] addObserver:self  selector:@selector( orientationChanged: )  name:UIDeviceOrientationDidChangeNotification  object:nil];


-(void) viewDidDisappear:(BOOL) animated

  [[NSNotificationCenter defaultCenter]removeObserver:self name:UIDeviceOrientationDidChangeNotification object:nil];


-(void) adjustViewsForOrientation:(UIInterfaceOrientation) orientation



-(void) orientationChanged: (NSNotification *) notification

  CGSize screenSize = [UIApplication currentSize];

  NSLog( @"** orientationChanged ** ScreenSize: %d x %d", (int) screenSize.width, (int) screenSize.height );

  g_MaxPixelWidth  = screenSize.width;
  g_MaxPixelHeight = screenSize.height;

  return;


-(void) didRotate: (id) sender

  UIDeviceOrientation    orientation       = [[UIDevice currentDevice] orientation];
  UIInterfaceOrientation cachedOrientation = [self interfaceOrientation];

  if( orientation == UIDeviceOrientationUnknown ||
      orientation == UIDeviceOrientationFaceUp  ||
      orientation == UIDeviceOrientationFaceDown )
  
    orientation = (UIDeviceOrientation)cachedOrientation;
  

  if( orientation == UIDeviceOrientationLandscapeLeft || orientation == UIDeviceOrientationLandscapeRight )
  
    if( orientation == UIDeviceOrientationLandscapeLeft )
      [UIApplication sharedApplication].statusBarOrientation = UIInterfaceOrientationLandscapeLeft;
    else
    if( orientation == UIDeviceOrientationLandscapeRight )
      [UIApplication sharedApplication].statusBarOrientation = UIInterfaceOrientationLandscapeRight;

    CGSize screenSize = [UIApplication currentSize];

    g_MaxPixelWidth  = screenSize.width;
    g_MaxPixelHeight = screenSize.height;

    NSLog( @"** didRotate: LANDSCAPE: %d x %d", g_MaxPixelWidth, g_MaxPixelHeight );
  

  if( orientation == UIDeviceOrientationPortrait || orientation == UIDeviceOrientationPortraitUpsideDown )
  
    if( orientation == UIDeviceOrientationPortrait )
      [UIApplication sharedApplication].statusBarOrientation = UIInterfaceOrientationPortrait;
    else
    if( orientation == UIDeviceOrientationPortraitUpsideDown )
      [UIApplication sharedApplication].statusBarOrientation = UIInterfaceOrientationPortraitUpsideDown;

    CGSize screenSize = [UIApplication currentSize];

    g_MaxPixelWidth  = screenSize.width;
    g_MaxPixelHeight = screenSize.height;

    NSLog( @"** didRotate: PORTRAIT: %d x %d", g_MaxPixelWidth, g_MaxPixelHeight  );
  

  for (UIView *view in self.view.subviews)
  
    [view removeFromSuperview];
  



-(void) layoutSubviews

  NSLog( @"- layoutSubviews" );


- (void) viewWillLayoutSubviews

  NSLog( @"- viewWillLayoutSubviews" );

  [self addMyContent];


- (NSUInteger)supportedInterfaceOrientations

  return UIInterfaceOrientationMaskAllButUpsideDown;


- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation

  return YES;


@end

【问题讨论】：

仅供参考：layoutSubviews 应始终致电 [super layoutSubviews]。

@progrmr：谢谢。这能解决我的问题吗？

【参考方案1】：

我认为这可能是答案 - 使用 CGAffineTransformMakeRotation 方法..

this *** posting

确实，这解决了我的问题。