判斷UItextFiled只包含小數點後一位且是5

- (UITextField *)daysTextFiled {
    if (!_daysTextFiled) {
        self.daysTextFiled = [[UITextField alloc] initWithFrame:CGRectMake(CGRectGetMaxX(self.daysLabel.frame), 4.5*HomePageDefineWidth, width(self.frame) - 47*HomePageDefineWidth, 30*HomePageDefineWidth)];
        _daysTextFiled.textColor = LHColor(51, 51, 51);
        _daysTextFiled.font = [UIFont systemFontOfSize:30*HomePageDefineWidth];
        _daysTextFiled.delegate = self;
        [_daysTextFiled becomeFirstResponder];
        [[UITextField appearance] setTintColor:LHColor(51, 51, 51)];
        [_daysTextFiled addTarget:self action:@selector(textFieldDidChange:) forControlEvents:UIControlEventEditingChanged];

    }
    return _daysTextFiled;
}

- (void)textFieldDidChange:(UITextField *)textfiled {
    if ([textfiled.text containsString:@"."]) {
        if (count == 1) {
            length = textfiled.text.length;
            NSArray *num = [textfiled.text componentsSeparatedByString:@"."];
            if ([num[1] integerValue] != 5) {
                if ([num[1] length] != 0) {
                    textfiled.text = [NSString stringWithFormat:@"%@.5",num[0]];
                    [self addSubview:self.smallLabel];
                    self.bottomView.frame = CGRectMake(0, maxY(self.smallLabel), width(self.frame), 79*HomePageDefineWidth);
                    [[NSNotificationCenter defaultCenter] postNotificationName:@"rememberEnlargePopView" object:self];
                }
            }else {
                textfiled.text = [NSString stringWithFormat:@"%@.5",num[0]];
                [self addSubview:self.smallLabel];
                self.bottomView.frame = CGRectMake(0, maxY(self.smallLabel), width(self.frame), 79*HomePageDefineWidth);
                [[NSNotificationCenter defaultCenter] postNotificationName:@"rememberEnlargePopView" object:self];
            }
        }else {
            if (textfiled.text.length < length) {
                if (count == 0) {
                    textfiled.text = [NSString stringWithFormat:@"0.5"];
                    [self addSubview:self.smallLabel];
                    self.bottomView.frame = CGRectMake(0, maxY(self.smallLabel), width(self.frame), 79*HomePageDefineWidth);
                    [[NSNotificationCenter defaultCenter] postNotificationName:@"rememberEnlargePopView" object:self];
                }
            }else {
                if (count != 0) {
                    NSArray *num = [textfiled.text componentsSeparatedByString:@"."];
                    textfiled.text = [NSString stringWithFormat:@"%@.5",num[0]];
                    [self addSubview:self.smallLabel];
                    self.bottomView.frame = CGRectMake(0, maxY(self.smallLabel), width(self.frame), 79*HomePageDefineWidth);
                    [[NSNotificationCenter defaultCenter] postNotificationName:@"rememberEnlargePopView" object:self];
                }else {
                    if (textfiled.text.length == 1) {
                        textfiled.text = [NSString stringWithFormat:@"0.5"];
                        [self addSubview:self.smallLabel];
                        self.bottomView.frame = CGRectMake(0, maxY(self.smallLabel), width(self.frame), 79*HomePageDefineWidth);
                        [[NSNotificationCenter defaultCenter] postNotificationName:@"rememberEnlargePopView" object:self];
                    }
                }
            }
        }
        count += 1;
    }else {
        if (count == 0) {
            if ([textfiled.text isEqualToString:@"0"]) {
                textfiled.text = @"0.5";
                [self addSubview:self.smallLabel];
                self.bottomView.frame = CGRectMake(0, maxY(self.smallLabel), width(self.frame), 79*HomePageDefineWidth);
                [[NSNotificationCenter defaultCenter] postNotificationName:@"rememberEnlargePopView" object:self];
                count = 1;
            }
        }else {
            count = 0;
        }
        self.smallLabel.frame = CGRectZero;
        self.smallLabel = nil;
        self.bottomView.frame = CGRectMake(0, maxY(self.daysView), width(self.frame), 79*HomePageDefineWidth);
        [[NSNotificationCenter defaultCenter] postNotificationName:@"rememberPopView" object:self];
    }
}