自从发现漏洞以来，无法在iOS 8上执行此操作。更多信息： http://cve.mitre.org /cgi-bin/cvename.cgi?name=CVE-2014-4361

It is not possible to do it on iOS 8 since a vulnerability was discovered. More info here: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-4361