嗨，你可以使用IQTextView可用的IQKeyboard管理器，这是简单的使用和集成只是设置类你的textview到IQTextView，你可以使用它的属性设置占位符标签与你想要的颜色。 您可以从IQKeyboardManager下载该库

或者你也可以从cocoapods上安装。

我修改了Sam Soffes的实现以适应iOS7:

- (void)drawRect:(CGRect)rect
{
    [super drawRect:rect];

    if (_shouldDrawPlaceholder)
    {
        UIEdgeInsets insets = self.textContainerInset;        
        CGRect placeholderRect = CGRectMake(
                insets.left + self.textContainer.lineFragmentPadding,
                insets.top,
                self.frame.size.width - insets.left - insets.right,
                self.frame.size.height - insets.top - insets.bottom);

        [_placeholderText drawWithRect:placeholderRect
                           options:NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingTruncatesLastVisibleLine
                        attributes:self.placeholderAttributes
                           context:nil];
    }
}

- (NSDictionary *)placeholderAttributes
{
    if (_placeholderAttributes == nil)
    {
        _placeholderAttributes = @
        {
            NSFontAttributeName : self.font,
            NSForegroundColorAttributeName : self.placeholderColor
        };
    }

    return _placeholderAttributes;
}

记住在可能改变字体和其他可能影响它们的东西的方法中设置_placeholderattributes = nil。如果没有问题的话，您可能还想跳过属性字典的“惰性”创建。

编辑:

如果你想让占位符在自动布局动画之后看起来更好，记得在setBounds的重写版本中调用setNeedsDisplay。

你能做的是在文本属性中设置文本视图的初始值，并将textColor更改为[UIColor grayColor]或类似的东西。然后，每当文本视图变为可编辑时，清除文本并显示游标，如果文本字段再次为空，则将占位符文本放回。根据需要将颜色更改为[UIColor blackColor]。

它与UITextField中的占位符功能不完全相同，但很接近。

我已经创建了一个快速3版本的最高排名的答案

你只需要做UITextView的子类化。

import UIKit

 class UIPlaceHolderTextView: UITextView {


//MARK: - Properties
@IBInspectable var placeholder: String?
@IBInspectable var placeholderColor: UIColor?
var placeholderLabel: UILabel?


//MARK: - Initializers
override func awakeFromNib() {
    super.awakeFromNib()


}

required init?(coder aDecoder: NSCoder) {
    super.init(coder: aDecoder)

    // Use Interface Builder User Defined Runtime Attributes to set
    // placeholder and placeholderColor in Interface Builder.
    if self.placeholder == nil {
        self.placeholder = ""
    }

    if self.placeholderColor == nil {
        self.placeholderColor = UIColor.black
    }

    NotificationCenter.default.addObserver(self, selector: #selector(textChanged(_:)), name: NSNotification.Name.UITextViewTextDidChange, object: nil)

}

func textChanged(_ notification: Notification) -> Void {
    if self.placeholder?.count == 0 {
        return
    }

    UIView.animate(withDuration: 0.25) {
        if self.text.count == 0 {
            self.viewWithTag(999)?.alpha = 1
        }
        else {
            self.viewWithTag(999)?.alpha = 0
        }
    }
}

// Only override draw() if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
override func draw(_ rect: CGRect) {
    super.draw(rect)

    if (self.placeholder?.count ?? 0) > 0 {
        if placeholderLabel == nil {
            placeholderLabel = UILabel.init()
            placeholderLabel?.lineBreakMode = .byWordWrapping
            placeholderLabel?.numberOfLines = 0
            placeholderLabel?.font = self.font
            placeholderLabel?.backgroundColor = self.backgroundColor
            placeholderLabel?.textColor = self.placeholderColor
            placeholderLabel?.alpha = 0
            placeholderLabel?.tag = 999
            self.addSubview(placeholderLabel!)

            placeholderLabel?.translatesAutoresizingMaskIntoConstraints = false
            placeholderLabel?.topAnchor.constraint(equalTo: self.topAnchor, constant: 7).isActive = true
            placeholderLabel?.leftAnchor.constraint(equalTo: self.leftAnchor, constant: 4).isActive = true
            placeholderLabel?.bottomAnchor.constraint(equalTo: self.bottomAnchor).isActive = true
            placeholderLabel?.rightAnchor.constraint(equalTo: self.rightAnchor).isActive = true
        }

        placeholderLabel?.text = self.placeholder
        placeholderLabel?.sizeToFit()
        self.sendSubview(toBack: self.placeholderLabel!)
    }

    if self.text.count == 0 && (self.placeholder?.count ?? 0) > 0 {
        self.viewWithTag(999)?.alpha = 1
    }
 }
}

我刚刚发现，在iOS 10中，你现在可以将UITextView转换为方法的UITextField，并在方法中设置占位符。刚试过，它不需要子类化UITextView就能工作。

下面是一个对我有用的例子:

-(void)customizeTextField:(UITextField *)textField placeholder:(NSString *)pText withColor:(UIColor *)pTextColor{

        textField.attributedPlaceholder = [[NSAttributedString alloc]
                                          initWithString:pText
                                          attributes:@{NSForegroundColorAttributeName:pTextColor}];
    }

为了将它用于UITextView，你只需要将它传递给方法，使用像这样的类型转换:

[self customizeTextField:(UITextField*)_myTextView placeholder:@"Placeholder" withColor:[UIColor blackColor]];

注:经过测试，我发现这个解决方案在iOS9上也很好。但是会在iOS8.x上导致崩溃

在代码行中使用它的简单方法:

取一个标签到。nib中的UITextView 将这个标签连接到你的代码， 在它。

- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text{

    if (range.location>0 || text.length!=0) {
        placeholderLabel1.hidden = YES;
    }else{
        placeholderLabel1.hidden = NO;
    }
    return YES;
}