#import <UIKit/UIKit.h>

@interface RootViewController : UIViewController

<UITextFieldDelegate>

@end

#import "RootViewController.h"

@interface RootViewController ()

@end

@implementation RootViewController

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil

{

    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];

    if (self) {

        // Custom initialization

    }

    return self;

}

- (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];

}