The keyboard input obtained by the delegate of uitextfield and the text displayed on the uitextfield

-(Bool) textfield :( uitextfield *) textfield shouldchangecharactersinrange :( nsange) range replacementstring :( nsstring *) String

When you enter a character in textfield, the proxy will get the character you want to enter. But the strange thing is that some are different from what is actually displayed.

Take the Japanese keyboard as an example:

This key is used to convert the input katakana to voiced, voiced, or nickname. However, the character obtained by the preceding delegate is"☻", A smiling face.

Also, if you click the "delimiter" key twice, the "delimiter" should be displayed, but the character obtained by delegate is "delimiter ".