You can use this code. It's working well for me:
UITextField* txtfield = [[UITextField alloc]initWithFrame:CGRectMake(10, 50, 300, 32)];
[txtfield setBorderStyle:UITextBorderStyleNone];
txtfield.layer.cornerRadius = 15.0;
txtfield.layer.borderWidth = 2.0;
txtfield.layer.borderColor = [UIColor redColor].CGColor;
txtfield.layer.masksToBounds = YES;
[self.view addSubview:txtfield];
Set the background in your view , and set the borderColor to clearColor .
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