工具：mac电脑，xcode7
打开苹果手机打开开发者步骤如下:
1.用数据线连接iPhone和mac。
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2.打开xcode7，选择Xcode->Windows菜单中的Devices。
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https://iknow-pic.cdn.bcebos.com/f703738da9773912f1e90821f6198618377ae2a7"/>
3.拿出手机，右键单击选择ShowProvisioningProfiles。
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https://iknow-pic.cdn.bcebos.com/f703738da97739125aa9a120f6198618377ae2e0"/>
4.在弹窗中的列表中查看，是否有开发者证书，如果没有，就点击“+”，添加开发者证书，完成后点击“Done”。如图：
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https://iknow-pic.cdn.bcebos.com/55e736d12f2eb938fdba40b3db628535e4dd6f9f"/>
4.关闭窗口，查看手机上已经出现“开发者选项”。