这里有2个选项：

1. 使用没有安全输入选项的普通文本字段。用户输入字符时，将其保存到字符串变量，然后在文本字段中将其替换为您希望显示的字符而不是项目符号。

这是代码（将密码显示为$$$$）：

var password: String = ""
func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool
{
    password = password+string
    textField.text = textField.text+"$"
    println("\(password)")
    return false
}

1. 在此处查看答案：

```
@interface SecureTextFieldWithCustomFont : UITextField
@property (nonatomic) BOOL secure;
@property (nonatomic, strong) NSString *actualText;
@end

@implementation SecureTextFieldWithCustomFont

-(void)awakeFromNib
{
[super awakeFromNib];

if (self.secureTextEntry)
{
    // Listen for changes.
    [self addTarget:self action:@selector(editingDidBegin) forControlEvents:UIControlEventEditingDidBegin];
    [self addTarget:self action:@selector(editingDidChange) forControlEvents:UIControlEventEditingChanged];
    [self addTarget:self action:@selector(editingDidFinish) forControlEvents:UIControlEventEditingDidEnd];
}

}

-(NSString*)text
{
if (self.editing || self.secure == NO)

else
{ return self.actualText; }

}

-(void)editingDidBegin
{
self.secureTextEntry = YES;
self.text = self.actualText;
}

-(void)editingDidChange

-(void)editingDidFinish
{
self.secureTextEntry = NO;
self.actualText = self.text;
self.text = [self dotPlaceholder];
}

-(NSString)dotPlaceholder
{
int index = 0;
NSMutableString dots = @”“.mutableCopy;
while (index < self.text.length)
{ [dots appendString:@”•”]; index++; }
return dots;
}

@end
```