IOS Chinese input Length control

When using the Pinyin input method, the last parameter in the delegate method string accepts the input letter instead of the selected Chinese character, and the result is that when you want to enter the text "I am Programming", enter the Pinyin "Wozaibiancheng", each input letter will enter the delegate method, The character length of the statistic is the length of the letter, in fact the character has not exceeded the limit length, but the length of the letter exceeds the input.

The Chinese way to control the input length is as follows:

1. Register notification

[[Nsnotificationcenter defaultcenter]addobserver:self selector: @selector (textfilededitchanged:)                                                Name: Uitextfieldtextdidchangenotification                                              Object:self.customTextField];

　　

2. Implement the Listening method

-(void) textfilededitchanged: (nsnotification *) obj{    Uitextfield *textfield = (Uitextfield *) Obj.object;        NSString *tobestring = Textfield.text;    NSString *lang = [[UIApplication sharedapplication] textinputmode].primarylanguage; Keyboard Input mode    if ([Lang isequaltostring:@ "Zh-hans"]) {//Simplified Chinese input, including simplified pinyin, fitness wubi, simplified handwriting        uitextrange *selectedrange = [ TextField Markedtextrange];        Get the highlighted part        uitextposition *position = [TextField positionFromPosition:selectedRange.start offset:0];        No highlighted words, word count and limit        if (!position) {            if (Tobestring.length > 5) {                Textfield.text = [ Tobestring substringtoindex:5];            }        }        There is a highlighted string, then the text is not counted and limited        else{                    }    }    //Chinese Input method directly to its statistical restrictions, regardless of other languages    else{        if ( Tobestring.length > 5) {            Textfield.text = [tobestring substringtoindex:5];}}  

　　

3. In the Dealloc

-(void) dealloc{    [[Nsnotificationcenter defaultcenter]removeobserver:self                                                   Name: Uitextfieldtextdidchangenotification                                                 Object:self.customTextField];}

　　

Similarly, when using Uitextview, the same approach is used if you want to restrict Chinese input.

[[Nsnotificationcenter defaultcenter]addobserver:self selector: @selector (textvieweditchanged:)                                                Name: Uitextviewtextdidchangenotification                                              Object:mytextview];

　　

IOS Chinese input Length control