xcode中UIDeviceOrientation之前的预期表达式

Question

因此，我正在尝试制作一个游戏，它将根据设备在启动时的方向加载特定的XIB文件。我的代码如下所示：

- (id)initWithNibName:(NSString *)nibName owner:owner bundle:(NSBundle *)bundleName {
    if (UIDeviceOrientation == UIDeviceOrientationLandscapeLeft || UIDeviceOrientation == UIDeviceOrientationLandscapeRight) {
        [[NSBundle mainBundle] loadNibNamed:@"Landscape.xib" owner:self options:nil];
    }
    if (UIDeviceOrientation == UIDeviceOrientationPortrait || UIDeviceOrientation == UIDeviceOrientationPortraitUpsideDown) {
        [[NSBundle mainBundle] loadNibNamed:@"Portrait.xib" owner:self options:nil];
    }

    return self;
}

我得到了这个错误:在两次出现错误时："error: expected before 'UIDeviceOrientation'“。

有没有人知道它在要求什么或者我做错了什么？

Answer 1

UIDeviceOrientation不是一个实际的变量或常量，它是一个类型。您可能希望改用UIDevice currentDevice.orientation：

- (id)initWithNibName:(NSString *)nibName owner:owner bundle:(NSBundle *)bundleName {
    UIDeviceOrientation   orientation = [UIDevice currentDevice].orientation;
    NSString   *nibName = UIDeviceOrientationIsLandscape(orientation) ? @"Landscape" : @"Portrait";

    [[NSBundle mainBundle] loadNibNamed:@nibName owner:self options:nil];

    return self;
}