[英]Changing back button text in navigation bar after the child view is pushed in
[英]Determine if view that appears was pushed or came from back button in navigation bar
有沒有辦法判斷新控制器是來自導航后退按鈕還是被推入堆棧? 我想重新加載數據只是為了推送導航堆棧,而不是按下后退按鈕。
從iOS 5.0開始,您可以這樣做:
- (void)viewWillAppear:(BOOL)animated {
[super viewWillAppear:animated];
if (self.isBeingPresented || self.isMovingToParentViewController) {
// "self" is being shown for the 1st time, not because of a "back" button.
}
}
如果您的推送還包括實例化視圖控制器,請將您的只推送邏輯放在viewDidLoad
。 它不會被調用,因為它已被加載。
您可以實現UINavigationControllerDelegate並覆蓋`navigationController:didShowViewController:animated:'方法。 然后,您必須檢查返回的視圖控制器,以確定您是否從預期的視圖控制器返回。
- (void)navigationController:(UINavigationController*)navigationController didShowViewController:(UIViewController*)viewController animated:(BOOL)animated
{
if (yourPushedViewController == viewController)
{
// Do something
}
}
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