Uitextfield Limit Word Count method

? ? ? ? Today was the day of the problem. In the Uitextfield delegate method, various judgments. The result is still a bug. The most obvious is the Chinese input mode, the Lenovo input can break the word limit.

  Today we find a way to register the Observer uitextfieldtextdidchangenotification. If the Uitextfield content changes, count the words and judge.

Take three steps:

   First step: Register the Observer.

    [[Nsnotificationcenter Defaultcenter] addobserver:self selector: @selector (textfielddidchange:) Name: Uitextfieldtextdidchangenotification Object:_partnametextfield];

????? Step two: Ways to implement the observer.?

-(void) Textfielddidchange: (nsnotification *) obj{Uitextfield * TextField = (Uitextfield *) Obj.object;        NSString *tobestring = Textfield.text;    Keyboard input mode (the way to determine the input mode is iOS7 later use, if you want to do compatible, Google) Nsarray * Currentar = [Uitextinputmode activeinputmodes];    Uitextinputmode * current = [Currentar firstobject];  if ([Current.primarylanguage 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];                If there is no highlighted word, the word count and limit if (!position) {if (Tobestring.length > Ktextfieldlengthlimit                Textfield.text = [tobestring substringtoindex:ktextfieldlengthlimit];            [Self Showerrortips:nil message:nslocalizedstring (@ "Textfield_length_limit", nil)];//This method is the third-party warning box that I introduced. Readers can complete their own warning pop-up window.       }}//With a highlighted string, the text is temporarily not counted and restricted else{             }}//In addition to the Chinese input method directly to its statistical restrictions, regardless of other languages else{if (Tobestring.length > Ktextfieldlengthlimit) {                    Textfield.text = [tobestring substringtoindex:ktextfieldlengthlimit]; }    }    }

? ? ? ? Step three: Destroy the Observer.

-(void) dealloc{    [[Nsnotificationcenter Defaultcenter] removeobserver:self name: Uitextfieldtextdidchangenotification Object:_partnametextfield];}

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? ? ? ? All right, finish the call.

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Uitextfield Limit Word Count method