更改UITextfield中的安全密码字符 [英] change the secure password character in UITextfield

问题描述

是否可以更改显示的安全密码字符？

Is it possible to change the secure password character displayed ?

推荐答案

假设Bobby B是对的，那是不可能的改变秘密角色，

我在此提出，

没有任何保证，并且有适用的所有警告，

因为这是一个可怕的kludge 肯定会让你头疼，

希望不要过多投票：

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 */

将 UITextField 的委托设置为包含此函数的类。

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

确保您有 self.backing 这是一个保留的 NSString * 。需要使用复制和粘贴kludge来保留光标位置。

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

我对粘贴一无所知，这是一个疯狂的猜测它可行，但你确实需要找出这是否会导致这方面的问题。我测试了一点，似乎没有任何问题。

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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