ios標簽欄單擊以顯示模態視圖獲得黑屏

Question

嗨，我想實現這個動畫效果（使用故事板），當用戶點擊標簽欄（比如第二個標簽欄項）時，它會像模態視圖一樣顯示相應的視圖（向上顯示到屏幕）

我當前的方法是委托標簽欄控制器到標簽欄並重寫

-(void)tabBar:(UITabBar *)tabBar didSelectItem:(UITabBarItem *)item{
    NSLog(@"rawr");
    NSLog(@"inside tab bar did select, index is %d", self.selectedIndex);

    if (item == [self.tabBar.items objectAtIndex:1]) {
        //item.title = @"modal view";
        NSLog(@"going to promote as modal view");
        CBTab2ViewController* modalViewController = [[CBTab2ViewController alloc] init];
        [self presentViewController:modalViewController animated:YES completion:nil];
    }
}

問題是，顯示的視圖是黑屏，任何想法如何正確實現？

我的源代碼可以在下面找到一個鏈接： https ： //www.dropbox.com/s/6rd6ek59xf0yiq4/testtabbar.zip

Answer 1

改變線條：

CBTab2ViewController* modalViewController = [[CBTab2ViewController alloc] init];
[self presentViewController:modalViewController animated:YES completion:nil];

對於這個（因為你的故事板名稱是“MainStoryBoard”）：

 UIStoryboard *mainStoryboard = [UIStoryboard storyboardWithName:@"MainStoryboard"
                                                         bundle: nil];

CBTab2ViewController * modalViewController = (MyViewController*)[mainStoryboard 
                        instantiateViewControllerWithIdentifier: @"CBTab2ViewController"];

[self presentViewController:modalViewController animated:YES completion:nil];