No, that wouldn't work. The issue with that is it will only search for U+25A1 (the unicode ID for the Tofu Box itself), while a tofu box appears due to a rendering issue and not because the character itself doesn't exist. For example, a new currency is introduced, there is a unicode ID for it (say U+200B2), but due to the font not existing yet it will still show up as a tofu box in many cases. The right way to detect is through an OS API where we pass a character and it will return true/false

Hi Ziqiao, please refer to the comment I have added below this post. I have detailed out some further questions. In short: I have used the primaryLanguage property in UITextInputMode to achieve some similar functionality. This seems to work well for a particular TextField, however, this is TextField specific and not app-wide. Is there any way to change the input language for the entire app? Secondly, coming to MacOS, is there something similar to iOS above in MacOS?

Hi Ziqiao, please refer to the comment I have added below this post. I have detailed out some further questions. In short: I have used the primaryLanguage property in UITextInputMode to achieve some similar functionality. This seems to work well for a particular TextField, however, this is TextField specific and not app-wide. Is there any way to change the input language for the entire app? Secondly, coming to MacOS, is there something similar to iOS above in MacOS?

Hi Ziqiao, please refer to the comment I have added below this post. I have detailed out some further questions. In short: I have used the primaryLanguage property in UITextInputMode to achieve some similar functionality. This seems to work well for a particular TextField, however, this is TextField specific and not app-wide. Is there any way to change the input language for the entire app? Secondly, coming to MacOS, is there something similar to iOS above in MacOS?

Hi Ziqiao, please refer to the comment I have added below this post. I have detailed out some further questions. In short: I have used the primaryLanguage property in UITextInputMode to achieve some similar functionality. This seems to work well for a particular TextField, however, this is TextField specific and not app-wide. Is there any way to change the input language for the entire app? Secondly, coming to MacOS, is there something similar to iOS above in MacOS?

Hi Ziqiao, please refer to the comment I have added below this post. I have detailed out some further questions. In short: I have used the primaryLanguage property in UITextInputMode to achieve some similar functionality. This seems to work well for a particular TextField, however, this is TextField specific and not app-wide. Is there any way to change the input language for the entire app? Secondly, coming to MacOS, is there something similar to iOS above in MacOS?

Hi Ziqiao, please refer to the comment I have added below this post. I have detailed out some further questions. In short: I have used the primaryLanguage property in UITextInputMode to achieve some similar functionality. This seems to work well for a particular TextField, however, this is TextField specific and not app-wide. Is there any way to change the input language for the entire app? Secondly, coming to MacOS, is there something similar to iOS above in MacOS?

Hi Ziqiao, please refer to the comment I have added below this post. I have detailed out some further questions. In short: I have used the primaryLanguage property in UITextInputMode to achieve some similar functionality. This seems to work well for a particular TextField, however, this is TextField specific and not app-wide. Is there any way to change the input language for the entire app? Secondly, coming to MacOS, is there something similar to iOS above in MacOS?

Hi Ziqiao, please refer to the comment I have added below this post. I have detailed out some further questions. In short: I have used the primaryLanguage property in UITextInputMode to achieve some similar functionality. This seems to work well for a particular TextField, however, this is TextField specific and not app-wide. Is there any way to change the input language for the entire app? Secondly, coming to MacOS, is there something similar to iOS above in MacOS?

Hi Ziqiao, please refer to the comment I have added below this post. I have detailed out some further questions. In short: I have used the primaryLanguage property in UITextInputMode to achieve some similar functionality. This seems to work well for a particular TextField, however, this is TextField specific and not app-wide. Is there any way to change the input language for the entire app? Secondly, coming to MacOS, is there something similar to iOS above in MacOS?