通过itunes设置iphone铃声主要办法有2种：
自己截取40秒以内的音乐，在itunes里面转化格式同步到手机（此方法操作略复杂）。
/iknow-pic.cdn.bcebos.com/902397dda144ad341a59acc4dca20cf430ad858a"target="_blank"title="点击查看大图"class="ikqb_img_alink">/iknow-pic.cdn.bcebos.com/902397dda144ad341a59acc4dca20cf430ad858a?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto"esrc="https://iknow-pic.cdn.bcebos.com/902397dda144ad341a59acc4dca20cf430ad858a"/>
2.下载铃声类的app，然后直接在此app里面下载铃声
/iknow-pic.cdn.bcebos.com/cb8065380cd79123a8dcbe37a1345982b2b780b0"target="_blank"title="点击查看大图"class="ikqb_img_alink">/iknow-pic.cdn.bcebos.com/cb8065380cd79123a8dcbe37a1345982b2b780b0?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto"esrc="https://iknow-pic.cdn.bcebos.com/cb8065380cd79123a8dcbe37a1345982b2b780b0"/>
铃声类app如铃声多多都会有教程指导，同时也是需要连接itunes进行手机同步。这个方式优点在于不需要自己转化文件格式，只需同步到手机即可。缺点在于铃声已经截取合适的长度，自己喜欢的需要寻找。