最终效果

号码分割.gif

OC代码

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
    
    // NSLog(@"%@",NSStringFromRange(range));
    if (textField && textField.tag == 1001) {
        NSString *text = textField.text;
        //删除
        if([string isEqualToString:@""]){
            //删除一位
            if(range.length == 1){
                //最后一位,遇到空格则多删除一次
                if (range.location == text.length-1 ) {
                    if ([text characterAtIndex:text.length-1] == ' ') {
                        [textField deleteBackward];
                    }
                    return YES;
                    
                }else{
                    //从中间删除
                    NSInteger offset = range.location;
                    if (range.location < text.length &&
                        [text characterAtIndex:range.location] == ' ' &&
                        [textField.selectedTextRange isEmpty]) {
                        [textField deleteBackward];
                        offset --;
                    }
                    [textField deleteBackward];
                    textField.text = [self parseString:textField.text];
                    UITextPosition *newPos = [textField positionFromPosition:textField.beginningOfDocument offset:offset];
                    textField.selectedTextRange = [textField textRangeFromPosition:newPos toPosition:newPos];
                    return NO;
                }
                
            }else if (range.length > 1) {
                
                BOOL isLast = NO;
                //如果是从最后一位开始
                if(range.location + range.length == textField.text.length ){
                    isLast = YES;
                }
                [textField deleteBackward];
                textField.text = [self parseString:textField.text];
                
                NSInteger offset = range.location;
                if (range.location == 3 || range.location  == 8) {
                    offset ++;
                }
                if (isLast) {
                    //光标直接在最后一位了
                }else{
                    UITextPosition *newPos = [textField positionFromPosition:textField.beginningOfDocument offset:offset];
                    textField.selectedTextRange = [textField textRangeFromPosition:newPos toPosition:newPos];
                }
                return NO;
            }else{
                return YES;
            }
            
        }else if(string.length >0){
            
            //限制输入字符个数
            if (([self noneSpaseString:textField.text].length + string.length - range.length > 11) ) {
                return NO;
            }
            //判断是否是纯数字(千杀的搜狗，百度输入法，数字键盘居然可以输入其他字符)
//            if(![string isNum]){
//                return NO;
//            }
            [textField insertText:string];
            textField.text = [self parseString:textField.text];
            
            NSInteger offset = range.location + string.length;
            if (range.location == 3 || range.location  == 8) {
                offset ++;
            }
            UITextPosition *newPos = [textField positionFromPosition:textField.beginningOfDocument offset:offset];
            textField.selectedTextRange = [textField textRangeFromPosition:newPos toPosition:newPos];
            return NO;
        }else{
            return YES;
        }
    }
    
    return YES;
}

- (NSString*)parseString:(NSString*)string {
    if (!string) {
        return nil;
    }
    NSMutableString* mStr = [NSMutableString stringWithString:[string stringByReplacingOccurrencesOfString:@" " withString:@""]];
    if (mStr.length >3) {
        [mStr insertString:@" " atIndex:3];
    }if (mStr.length > 8) {
        [mStr insertString:@" " atIndex:8];
        
    }
    return  mStr;
}