定制UITabBarItem

Question

我知道这是可能使用

[[UITabBar appearance] setSelectionIndicatorImage:[UIImage imageNamed:@"tabbar_sel"]]; 

的tabbar_sel图像具有宽度120像素（640像素/ 5）来定制UITabBarItem在IOS 5。对于横向模式，我需要将其更改为宽度为190x的图像。

- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration { 
if(toInterfaceOrientation == UIInterfaceOrientationLandscapeLeft || toInterfaceOrientation == UIInterfaceOrientationLandscapeRight) { 
    NSLog(@"landscape."); 
    [[UITabBar appearance] setSelectionIndicatorImage:[UIImage imageNamed:@"tabbar_sel_l"]]; 
    } else { 
    NSLog(@"normal."); 
    [[UITabBar appearance] setSelectionIndicatorImage:[UIImage imageNamed:@"tabbar_sel"]]; 
    } 
} 

但是，这不起作用，无论是在委托类还是在ViewController中。 我也已经试过这个，但它会导致崩溃。

[[UITabBar appearance] setSelectionIndicatorImage:[UIImage imageNamed:@"tabbar_sel"] 
forBarMetrics:UIBarMetricsDefault]; 
[[UITabBar appearance] setSelectionIndicatorImage:[UIImage imageNamed:@"tabbar_sel_l"] forBarMetrics:UIBarMetricsLandscapePhone]; 

Answer 1

willRotateToInterfaceOrientation：将调用视图时加载到检查至极的方向应该自动旋转，但是，它没有这个要求每次试图旋转时间。您可以观察方向如何变化，如下所示：

[[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications]; 
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(orientationChange:) name:UIDeviceOrientationDidChangeNotification object:nil]; 

- (void) orientationChange: (NSNotification *) notification { 
    UIDeviceOrientation orientation = [[UIDevice currentDevice] orientation]; 
    if (orientation == UIDeviceOrientationPortrait) { 
    NSLog(@"portrait"); 
    }else if(orientation == UIDeviceOrientationLandscapeLeft || orientation == UIDeviceOrientationLandscapeRight){ 
    NSLog(@"landscape"); 
    } 
}