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运行时导航栏上未显示工具栏按钮

[英]bar button is not showing on the navigation bar at run time

原文 2017-06-01 07:49:27 6 1 ios/ objective-c/ uinavigationcontroller/ navigationbar

I am following this tutorial , and as shown in image-1 below, I added the "Add" bar button, but when I run the simulator it does not show up as shown in image-2. 我正在按照本教程进行操作，并且如下面的图1所示，我添加了“添加”栏按钮，但是当我运行模拟器时，它没有如图2所示显示。

please let me know why the "Add" button is not showing and how to fix it. 请让我知道为什么“添加”按钮没有显示以及如何解决。

image-1 : 图片1 ：

image-2 : 图片2 ：

1 个解决方案

Two possible scenario : 两种可能的情况：

Scene 1 : 场景1：

Looks like you are using iPhone 6s Plus simulator and 100% zoomed. 看起来您正在使用iPhone 6s Plus模拟器，并且100％缩放。 So I could see horizontal and vertical scroll both. 所以我可以看到水平和垂直滚动。 I believe the Plus button is still there its just that u have to scroll to see it. 我相信加号按钮仍然存在，只是您必须滚动才能看到它。 Even the title Players is not in center :) 甚至标题玩家也不在中心:)

Use Command + 3 to zoom out the simulator and see the O/P without scroll :D 使用Command + 3缩小模拟器并查看O / P，无需滚动：D

Scene 2: 场景2：

If you have added Navigation bar manually make sure you add top, leading and trailing constraint to Navigation Bar. 如果您手动添加了导航栏，请确保将顶部，前导和尾随约束添加到导航栏。 The Nav bar you added is bigger than iPhone 6 plus size and because there is no auto layout constraint added it might have extended beyond the screen. 您添加的导航栏大于iPhone 6的尺寸，并且因为没有添加自动布局约束，它可能已扩展到屏幕之外。