修改UITextfield的Placeholder字体的颜色

两种方式 如下

//第一种   
   
 UIColor *color = [UIColor whiteColor];  
    _userName.attributedPlaceholder = [[NSAttributedString alloc] initWithString:@"用户名" attributes:@{NSForegroundColorAttributeName: color}];  
  
  
//第二种   
[_userName setValue:[UIColor whiteColor] forKeyPath:@"_placeholderLabel.textColor"];  

代码如下

_contactInfoField = [[UITextField alloc]init];
    _contactInfoField.placeholder = @"请留下您的联系方式(手机或邮箱)";
    _contactInfoField.frame = lxy(10, _imageScrollView.bottom+10, SCREEN_WIDTH-20*2, 40);
    _contactInfoField.layer.borderColor = [RGB(244, 244, 244) colorWithAlphaComponent:.2f].CGColor;
    _contactInfoField.layer.borderWidth = .6f;
    _contactInfoField.layer.cornerRadius = 5.f;
    _contactInfoField.delegate = self;
    _contactInfoField.font = smallFont;
    [_contactInfoField setValue:RGB(204, 204, 209) forKeyPath:@"_placeholderLabel.textColor"];
    [_contactInfoField setTextFieldLeftPaddingForWidth:5.f];
    [self.view addSubview:_contactInfoField];

截图如下

参考：http://blog.csdn.net/ck89757/article/details/38730961