Objectivec UITextField secureTextEntry 带有自定义字体的项目符号

解决这个问题的子类.创建arbitrary 100，然后将secure属性设置为YES(通过IB中的KVC).

实际上，它实现了lukech建议的注释.当textfield结束编辑时，它会切换到一个任意的textfield，然后在其中设置大量的点，并在text访问器中进行一些黑客攻击，以始终获得该字段所包含的实际文本.

@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)
    { return [super text]; }

    else
    { return self.actualText; }
}

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

-(void)editingDidChange
{ self.actualText = self.text; }

-(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

可能会被扩展以处理非NIB实例化、处理默认值等，但您可能已经明白了这一点.