iOS BUG: Unbalanced calls to begin/end appearance transitions for <XXXViewController: 0x7fcea3730650>.,unbalanced

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iOS BUG: Unbalanced calls to begin/end appearance transitions for <XXXViewController: 0x7fcea3730650>.,unbalanced

 

自訂TabBarController Push下一級Controller時 會報這樣的錯誤:Unbalanced calls to begin/end appearance transitions for <XXXViewController: 0x7fcea3730650>.

網上的一些回答,都說是動畫引起的,解決方案就是,加一個BOOL型的變數,檢查是否在做動畫。

    if (transiting) {
        return;
    }
    transiting = YES;
    [self transitionFromViewController:_currentVC toViewController:newVC duration:0.5 options:UIViewAnimationOptionTransitionCrossDissolve animations:^{
        
    } completion:^(BOOL finished) {
        
        transiting = NO;
    }];

這樣就不會出現剛才說的那個bug了。 

但是,這並沒有解決我的問題!

所以真正的答案是

自訂了TabBarController 之後必須實現以下

-(void)viewWillAppear:(BOOL)animated
{
    [self.selectedViewController beginAppearanceTransition: YES animated: animated];
}

-(void) viewDidAppear:(BOOL)animated
{
    [self.selectedViewController endAppearanceTransition];
}

-(void) viewWillDisappear:(BOOL)animated
{
    [self.selectedViewController beginAppearanceTransition: NO animated: animated];
}

-(void) viewDidDisappear:(BOOL)animated
{
    [self.selectedViewController endAppearanceTransition];

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