在 ShareKit 中,代码需要确定 rootViewController 的位置,以便它可以显示模态视图。由于某种原因,代码在 iOS 5 中失败:
// Try to find the root view controller programmically
// Find the top window (that is not an alert view or other window)
UIWindow *topWindow = [[UIApplication sharedApplication] keyWindow];
if (topWindow.windowLevel != UIWindowLevelNormal)
{
NSArray *windows = [[UIApplication sharedApplication] windows];
for(topWindow in windows)
{
if (topWindow.windowLevel == UIWindowLevelNormal)
break;
}
}
UIView *rootView = [[topWindow subviews] objectAtIndex:0];
id nextResponder = [rootView nextResponder];
if ([nextResponder isKindOfClass:[UIViewController class]])
self.rootViewController = nextResponder;
else
NSAssert(NO, @"ShareKit: Could not find a root view controller. You can assign one manually by calling [[SHK currentHelper] setRootViewController:YOURROOTVIEWCONTROLLER].");
这是命中断言。
简单地使用以下代码有什么问题?
rootViewController = [[[UIApplication sharedApplication] keyWindow] rootViewController];
这似乎工作正常。它会在某些情况下失败吗?
最佳答案
我不确定你是否可以依赖 window.rootViewController
b/c 你不必设置它。您可以只向窗口添加一个 subview 。以下似乎工作正常:
id rootVC = [[[[[UIApplication sharedApplication] keyWindow] subviews] objectAtIndex:0] nextResponder];
关于ios - 在 iOS 中查找 rootViewController,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/8585881/