iPhone人像/风景和坐标系统

Question

我真的很想弄清楚如何处理旋转。 我在这里阅读了许多文章，但无法获得将其以正确的方式并以正确的位置添加到横向屏幕的项目。

例如，我有一个纵向视图（320x480），并在位置（0,0）创建一个大按钮。 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-但不是。 我的按钮错误地显示在右上角，并且按钮上的文本在屏幕上向下而不是横向/最宽方向。

我将附加我的（混乱的）代码，以希望它对我正在尝试做的事情有所帮助。

我是否可以使用设备旋转坐标系，以使坐标系在横向模式下变为480x320（左上角为0，0），这是错误的吗？ 如果我没看错..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

Answer 1

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

此Stackoverflow发布

确实，这解决了我的问题。