Uitextfield limit the length of text Support Chinese Association

Uitextfield+text_constraints.h

@interface Uitextfield (text_constraints)//take into account the length of the text in some places is a range eg:2-10, so use Nsrange@property (nonatomic, assign) Nsrange    textlengthrange;-(BOOL) Shouldchangeinrange: (nsrange) Range replacestring: (NSString *) string; @end

　　

Uitextfield+text_constraints.m#import "Uitextfield+text_constraints.h" #import <objc/runtime.h>@ Implementation Uitextfield (text_constraints) #pragma mark-textlengthrange/** * Add notification of text changes, enter pinyin to select Chinese characters will be notified * Delegate Shou Ldchangecharactersinrange method does not call */-(void) addtextchangenotification{when selecting Chinese characters [[Nsnotificationcenter Defaultcenter]    Removeobserver:self name:uitextfieldtextdidchangenotification Object:nil]; [[Nsnotificationcenter Defaultcenter] addobserver:self selector: @selector (textfieldtextdidchangenotif:) Name: Uitextfieldtextdidchangenotification Object:nil];}    -(void) Textfieldtextdidchangenotif: (nsnotification *) notif{Uitextfield *textfield = notif.object;    Nsuinteger MaxNumber = self.textLengthRange.location + self.textLengthRange.length; if (Textfield.markedtextrange = = nil) {if (TextField.text.length > MaxNumber) {textfield.text = [te        Xtfield.text Substringtoindex:maxnumber]; }}}-(void) Settextlengthrange: (Nsrange) Textlengthrange{[self addtextchangenotification]; Objc_setassociatedobject (Self, @selector (textlengthrange), [Nsvalue Valuewithrange:textlengthrange], OBJC_ association_retain_nonatomic);}    -(Nsrange) textlengthrange{nsvalue *value = Objc_getassociatedobject (self, @selector (textlengthrange));    if (value) {return value.rangevalue; } return Nsmakerange (0, Nsuintegermax);} #pragma mark-textfield replace//(BOOL) TextField: (Uitextfield *) TextField Shouldchangecharactersinrange: (Nsrange) Range replacementstring: (NSString *) string, using-(BOOL) Shouldchangeinrange: (nsrange) Range replacestring: (NSString *) string{if (range.location >= (self.textLengthRange.location + self.textLengthRange.length) && (self.    Markedtextrange = = Nil && Range.length = = 0)) {return NO; } return YES; @end

　　

Uitextfield limit the length of text Support Chinese Association