要想在针对模拟器或设备的构建之间切换，应该从标签为Overview的下拉框中选择想要的SDK。

To switch between building for the simulator or a device, choose the desired SDK from the drop-down box labeled Overview.

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选择设备(而不是模拟器)，作为建设目标在弹出在左上方的Xcode窗口。

Select Device (rather than Simulator) as the build target in the popup at the top left of the Xcode window.

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