UITextField secureTextEntry - 从 YES 变为 NO，但改回 YES 无效 [英] UITextField secureTextEntry - works going from YES to NO, but changing back to YES has no effect

问题描述

以上说明了一切 - 我有一个 UITextField 设置为安全，但想让用户选择使其不安全(这样他们就可以确定他们在私人区域输入了什么).但是，假设他们误按了切换键，并想将其改回安全模式?那行不通.我已经尝试了一切 - 使用 -1 而不是 YES，删除文本然后将其放回原处.我对其他想法完全不知所措.[输入rdar://9781908]

The above says it all- I have a UITextField set to secure, but want to give users the option to make it not secure (so they can see for sure what they typed if they are in a private area). However, suppose they hit the toggle by mistake, and want to change it back to secure mode? That does not work. I've tried everything - using -1 instead of YES, deleting the text and then putting it back. I'm at a total loss on other ideas. [Entered rdar://9781908]

我相信这个问题从 iOS5 开始就已经解决了.

I believe this issue is fixed as of iOS5.

推荐答案

必定是 input-focus 问题:当获得焦点时，UITextField 只能改变 ON->OFF.
尝试下一个技巧来关闭->打开:

It must be input-focus issue: when focused, UITextField can change only ON->OFF.
Try next trick to switch OFF->ON:

textField.enabled = NO;
textField.secureTextEntry = YES;
textField.enabled = YES;
[textField becomeFirstResponder];

EDIT (dhoerl):在 iOS 9.3 中，我发现这可行，但存在问题.如果您在普通视图中输入 3 个字符，然后切换到安全文本，然后键入一个字符，则 3 个预先存在的字符将消失.我尝试了各种技巧来清除，然后重置文本没有成功.我终于尝试通过剪切和粘贴来玩控制 - 粘贴到新切换到安全模式的效果很好.所以我在代码中模拟了它，现在一切正常 - 也不需要与响应者一起玩.这是我最终得到的结果:

EDIT (dhoerl): In iOS 9.3, I found this works but there is a problem. If you enter say 3 characters in plain view, then switch to secure text, then type a character, the 3 pre-existing characters disappear. I tried all kinds of trick to clear, then reset the text without success. I finally tried just playing with the control by cutting and pasting - pasting into the newly-switched-to-secure-mode worked great. So I emulated it in code, and now it all works fine - no need to play with the responder either. Here is what I finally ended up with:

    if textview should go into secure mode and the textfield is not empty {
        textField.text = ""
        textField.secureTextEntry = true

        UIPasteboard.generalPasteboard().string = password
        textField.paste(self)
        UIPasteboard.generalPasteboard().string = ""
    }

我不想做这个粘贴，但如果你想要它无缝，这是我能找到的唯一方法.

I'd prefer to not have to do this paste, but if you want it seamless this is the only way I can find to do it.

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