试试这个

UITextField *tfText = [[UITextField alloc] initWithFrame:CGRectMake(65, 200, 200, 30)];
tfText.backgroundColor = [UIColor colorWithRed:0.2 green:0.9 blue:0.5 alpha:0.3];       
tfText.textAlignment = UITextAlignmentCenter;
// Border Style None
[tfText setBorderStyle:UITextBorderStyleNone];
[self.view addSubview:tfText];
[tfText release];

供参考

• http：//www.icodeblog。 com / 2010/01/04 / uitextfield-a-complete-api-overview /

• http://www.icodeblog.com/2010/01/04/uitextfield-a-complete-api-overview/