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更改 UITextfield 中的安全密码字符

发布于 2024-09-10 03:30:46 字数 23 浏览 2 评论 0原文

是否可以更改显示的安全密码字符？

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橘虞初梦 2024-09-17 03:30:46

假设鲍比 B 是对的，不可能改变秘密角色，
我在此提出，
没有任何保证且有所有适用的警告，
因为这是一个可怕的拼凑，在某些时候肯定会让你头疼，
希望不要对其投太多反对票：

/* don't ever use this PROOF OF CONCEPT CODE for production use */
-(BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{   
    if ( self.backing == nil ) self.backing = @"";
    static BOOL pasting = false;

    if ( !pasting )
    {       
        self.backing = [self.backing stringByReplacingCharactersInRange:range withString:string];
        NSLog(@"backing: %@",self.backing);
        if ( [string length] == 0 ) return YES; // early bail out when just deleting chars

        NSString *sec = @"";
        for ( int i=0;i<[string length]; i++ ) sec = [sec stringByAppendingFormat:@"■"];

        pasting = true;
        [[UIPasteboard generalPasteboard] setString:sec];
        [textField paste:self];

        return NO;  
    } else {
        pasting = false;
        return YES; 
    }       
}   
/* you have been warned */

将您的 UITextField 委托设置为包含此函数的类。

只需确保您有 self.backing，它是保留的 NSString*。需要复制和粘贴拼凑来保留光标位置。

我对粘贴一无所知，这是一个疯狂的猜测，它确实有效，但您确实需要找出这是否会导致这方面的问题。我测试了一下，似乎没有出现任何问题。

Assuming Bobby B is right in that it is impossible to change the secret character,
I hereby present,
with no guarantuee whatsoever and with all warnings that are applicable,
since this is a horrible kludge which will certainly give you headaches at some point,
hoping not to be downvoted too much for it:

/* don't ever use this PROOF OF CONCEPT CODE for production use */
-(BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{   
    if ( self.backing == nil ) self.backing = @"";
    static BOOL pasting = false;

    if ( !pasting )
    {       
        self.backing = [self.backing stringByReplacingCharactersInRange:range withString:string];
        NSLog(@"backing: %@",self.backing);
        if ( [string length] == 0 ) return YES; // early bail out when just deleting chars

        NSString *sec = @"";
        for ( int i=0;i<[string length]; i++ ) sec = [sec stringByAppendingFormat:@"■"];

        pasting = true;
        [[UIPasteboard generalPasteboard] setString:sec];
        [textField paste:self];

        return NO;  
    } else {
        pasting = false;
        return YES; 
    }       
}   
/* you have been warned */

Set your UITextField's delegate to the class containing this function.

Just make sure you have self.backing which is a retained NSString*. The copy&paste kludge was needed to preserve cursor position.

I don't know anything about pasting, this was a wild guess and it works, but you do need to find out if this may lead to some problem in that respect. I tested a little and it didn't seem to give any problem.

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