为iphone/ipad处理图像旋转的正确方法是什么？

Question

我有两张图片，一张是纵向模式，另一张是横向模式。当移动设备视图旋转时，切换这些图像的最佳方式是什么？

目前我只显示肖像图像。当设备旋转到横向模式时，肖像图像只是被拉伸。

我是否应该在方向旋转处理程序中进行检查，并简单地将图像重置为正确的方向图像(即，根据方向手动设置)？

谢谢!

Answer 1

我找到了三种方法，我认为最后一种更好

1：自动调整大小

示例：

UIImageView *myImageView=[[UIImageView alloc] initWithImage:[UIImage imageNamed:@"yourImage.png"]];    
myImageView.frame = self.view.bounds;
myImageView.autoresizingMask=UIViewAutoresizingFlexibleWidth|UIViewAutoresizingFlexibleHeight
myImageView.contentMode = UIViewContentModeScaleAspectFill;    
[self.view addSubview:myImageView]; 
[imageView release];

2：CGAffineTransformMakeRotation

示例：

-(void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation 
                                        duration:(NSTimeInterval)duration {
  if (toInterfaceOrientation == UIInterfaceOrientationLandscapeLeft) {        
                myImageView.transform = CGAffineTransformMakeRotation(M_PI / 2);
  }
  else if (toInterfaceOrientation == UIInterfaceOrientationLandscapeRight){
                myImageView.transform = CGAffineTransformMakeRotation(-M_PI / 2);
  }
  else {
             myImageView.transform = CGAffineTransformMakeRotation(0.0);
  }
}

3：在界面生成器中将myImageView的自动调整大小设置为自动填充屏幕

示例：

-(void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation {
if((self.interfaceOrientation == UIDeviceOrientationLandscapeLeft) || (self.interfaceOrientation == UIDeviceOrientationLandscapeRight)){
    myImageView.image = [UIImage imageNamed:@"myImage-landscape.png"];
} else  if((self.interfaceOrientation == UIDeviceOrientationPortrait) || (self.interfaceOrientation == UIDeviceOrientationPortraitUpsideDown)){
    myImageView.image = [UIImage imageNamed:@"myImage-portrait.png"];
} }

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