"iOS" throws an exception manually

<span id="Label3"><p></p><p><span style="font-family: ‘comic sans ms‘, sans-serif; font-size: 16px;">I have not encountered the need to manually throw an exception, this time, see, Record. The sample code is as Follows:</span></p><pre><span style="color: #008000;">/*</span><span style="color: #008000;"></span><span style="color: #008000;">*</span>/-<span style="color: #000000;"> (instancetype) init {</span><span style="color: #0000ff;">@throw</span> [nsexception exceptionwithname: <span style="color: #800000;"> @ "</span><span style="color: #800000;">Singleton</span><span style="color: #800000;">"</span><span style="color: #000000;"> reason:</span><span style="color: #800000;">@ "</span>use<span style="color: #800000;">+ [bnritemstore sharedstore] </span> <span style="color: #800000;">[</span><span style="color: #000000;"> userinfo:nil];}</span></pre><p></p><p>"iOS" throws an exception manually</p></span>