NSLog InterfaceRotation在模拟器上不起作用？

Question

我想知道为什么在iOS模拟器上测试时通过跟踪我的UIViewController中的代码没有控制台输出 - 它只能通过在设备上进行测试来跟踪.

- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration{
    NSLog(@"willRotateToInterfaceOrientation: ", toInterfaceOrientation);
}

我如何打印出UIInterfaceOrientation值(枚举类型)？很高兴得到你的帮助......谢谢

Answer 1

你的格式说明符在哪里？

UIInterfaceOrientation是一个typedef enum,而不是一个对象,所以你不能%@用作格式说明符.

应该是这样的:

- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration{
   NSLog(@"willRotateToInterfaceOrientation: %d", toInterfaceOrientation);
}

如果你真的需要这种"漂亮的打印"功能,你可以通过它运行它switch,如下所示:

NSString *orient;
switch(toInterfaceOrientation) {
   case UIInterfaceOrientationLandscapeRight:
       orient = @"UIInterfaceOrientationLandscapeRight";
       break;
   case UIInterfaceOrientationLandscapeLeft:
       orient = @"UIInterfaceOrientationLandscapeLeft";
       break;
   case UIInterfaceOrientationPortrait:
       orient = @"UIInterfaceOrientationPortrait";
       break;
   case UIInterfaceOrientationPortraitUpsideDown:
       orient = @"UIInterfaceOrientationPortraitUpsideDown";
       break;
   default: 
       orient = @"Invalid orientation";
}
NSLog(@"willRotateToInterfaceOrientation: %@", orient);