UIToolBar没有出现在iPhone 6和6 Plus上

Question

我正在尝试添加UIToolBar，但它不会出现在iPhone上。它出现在iPad上。我做错了什么？

UIToolbar *webToolBar = [[UIToolbar alloc]init];

    if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone)
    {
        fixedSpace.width = 20.0;

        [webToolBar setItems:[NSArray arrayWithObjects:backButton, forwardButton, flexibleSpace, refreshButton, fixedSpace, stopButton, nil]animated:NO];

        webToolBar.frame = CGRectMake(0, [[UIScreen mainScreen]bounds].size.height - 44, [[UIScreen mainScreen]bounds].size.width, 44);
    }
    else
    {
        UIBarButtonItem *fixedSpaceiPad =  [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace target:nil action:nil];
        fixedSpaceiPad.width = 460.0;

        fixedSpace.width = 50.0;

        webToolBar.frame = CGRectMake(0, 660, 703, 44);
        [webToolBar setItems:[NSArray arrayWithObjects:backButton, forwardButton, fixedSpaceiPad, refreshButton, fixedSpace, stopButton, nil]animated:NO];
    }

    webToolBar.delegate = self;
    [webToolBar setBarStyle:UIBarStyleDefault];
    webToolBar.tintColor = kfbBlue;
    webToolBar.hidden = NO;
    [webToolBar sizeToFit];
    [self.view addSubview:webToolBar];

我也尝试过这样放置它。通过此实现，它显示在iPhone 4S，5和5S上的正确位置，但它在6或6 Plus上根本不显示。

CGSize result = [[UIScreen mainScreen] bounds].size;
        NSInteger y = [[UIScreen mainScreen]bounds].size.height - 44;
        NSInteger screenWidth = [[UIScreen mainScreen]bounds].size.width;

        NSLog(@"Screen height = %f", [[UIScreen mainScreen]bounds].size.height);
        NSLog(@"y = %ld and width = %ld", y, screenWidth);

        fixedSpace.width = 20.0;

        // webToolBar.frame = CGRectMake(0, y, screenWidth, 44);

        [webToolBar setItems:[NSArray arrayWithObjects:backButton, forwardButton, flexibleSpace, refreshButton, fixedSpace, stopButton, nil]animated:NO];


        if (result.height == 480)
        {
            webToolBar.frame = CGRectMake(0, 372, 320, 44);
        }
        else if (result.height == 568)
        {
            webToolBar.frame = CGRectMake(0, 460, 320, 44);
        }
        else if (result.height == 667) {
            webToolBar.frame = CGRectMake(0, 623, 375, 44);
        }
        else if (result.height == 736) {
            webToolBar.frame = CGRectMake(0, 692, 414, 44);
        }