判斷某個(gè)字符串是否為空
if(string== nil ||string==NULL)
if( [string isKindOfClass:[NSNull class]] )
if( [[string stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceChara
判斷某個(gè)字符串是否為空
if(string== nil ||string==NULL)
if( [string isKindOfClass:[NSNull class]] )
if( [[string stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceChara