效果图：
代码：
- (void)viewDidLoad{ [super viewDidLoad]; // Do any additional setup after loading the view. UITextField *textField=[[UITextField alloc]initWithFrame:CGRectMake(50, 100, 200, 50)]; //UITextField设置placeholder颜色 UIColor *color = [UIColor redColor]; textField.attributedPlaceholder = [[NSAttributedString alloc] initWithString:@"密码" attributes:@{NSForegroundColorAttributeName: color}]; textField.delegate=self; [self.view addSubview:textField]; }