objective-c - 与坐标略有混淆

Question

嗨，我有这样的代码：

- (void)viewDidLoad
{
    [super viewDidLoad];         

    // Get view bounds
    CGRect bounds = [self.view bounds];

    // Get center point
    CGPoint center;
    center.x = bounds.origin.x + bounds.size.width/2.0;
    center.y = bounds.origin.y + bounds.size.height/2.0;


    NSLog(@"center y = %f", center.y);



}

上面的日志最初打印274.0

然后我有这个方法：

- (void)willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)x
                                         duration:(NSTimeInterval)duration
{

    CGRect bounds = [[self view] bounds];

    // Get center point
    CGPoint center;
    center.x = bounds.origin.x + bounds.size.width/2.0;
    center.y = bounds.origin.y + bounds.size.height/2.0;


    // If the orientation is rotating to Portrait mode...
    if (UIInterfaceOrientationIsPortrait(x))
    {
         NSLog(@"In rotation, center y = %f", center.y);      

    }


}

正如您center.y可能注意到的，上述方法中的计算方式与 viewDidLoad 中的计算方式相同。但是，当手机首先旋转到横向然后回到纵向时，现在center.y上面的方法总是打印 230（而不是最初的 274.0） - 为什么？这可能是什么原因造成的？

Answer 1

- (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation{
    CGRect bounds = [[self view] bounds];
    CGPoint center;
    center.x = bounds.origin.x + bounds.size.width/2.0;
    center.y = bounds.origin.y + bounds.size.height/2.0;
    if (UIInterfaceOrientationIsLandscape(fromInterfaceOrientation)){
        NSLog(@"In rotation, center y = %f", center.y);
    }
}