不能使用PHP的响应进入“if语句”OBJ-C

Question

我试图通过我从php获得的结果显示NSlog＆＃34; if statement＆＃34; 出于某种原因，我总是得到＆＃34;无法通过POST访问PHP的消息＆＃34; 如果我删除＆＃34; if语句＆＃34;并根据我输入的信息显示它所写的响应＆＃34;成功或失败＆＃34; 我做错了什么？

NSString *chklogin = [NSString stringWithFormat:@"email=%@&password=%@",usernameField.text, passwordField.text];
NSData *logindata = [NSData dataWithBytes: [chklogin UTF8String] length: [chklogin length]];
NSMutableURLRequest *urlreq = [[NSMutableURLRequest alloc] initWithURL:[NSURL URLWithString:@"http://37.142.62.22/riddem/mobileacc/userlogin.php"]];

[urlreq setHTTPMethod: @"POST"];
[urlreq setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"content-type"];
[urlreq setHTTPBody: logindata];
NSData *sendloginreq = [NSURLConnection sendSynchronousRequest:urlreq returningResponse:nil error:nil];
NSString *response =[[NSString alloc] initWithBytes:[sendloginreq bytes] length:[sendloginreq length] encoding:NSUTF8StringEncoding];
NSLog(@"%@" ,response);

if ([response isEqualToString:@"loginsecsses"]) {
    NSLog(@"OK");
}
else if ([response isEqualToString:@"loginfail"]) {
    NSLog(@"FAIL");
}
else { NSLog(@"Fail to access PHP via POST"); }