Question

我正在尝试从https://github.com/christopherney/FlatDatePicker自定义FlatDatePicker。

我的目标是从日期选择器的顶部删除两个按钮，并在屏幕底部添加一个确认按钮。在原始的FlatDatePicker.m文件中，作者使用以下代码初始化datepicker，tile和按钮：

if ([self initWithFrame:CGRectMake(0.0, _parentView.frame.size.height, _parentView.frame.size.width, kFlatDatePickerHeight)]) {
    _datePickerMode = FlatDatePickerModeDate;
    [_parentView addSubview:self];
    [self setupControl];
}
return self;

_labelTitle = [[UILabel alloc] initWithFrame:CGRectMake(kFlatDatePickerButtonHeaderWidth, 0.0, self.frame.size.width - (kFlatDatePickerHeaderHeight * 2), kFlatDatePickerHeaderHeight)];

_buttonValid = [[UIButton alloc] initWithFrame:CGRectMake(self.frame.size.width - kFlatDatePickerButtonHeaderWidth, 0.0, kFlatDatePickerButtonHeaderWidth, kFlatDatePickerHeaderHeight)];

然后将调用show方法从屏幕上向上滑动日期选择器：

-(void)show {

if (_parentView != nil) {

    if (self.hidden == YES) {
        self.hidden = NO;
    }

    if (_isInitialized == NO) {
        self.frame = CGRectMake(self.frame.origin.x, _parentView.frame.size.height, self.frame.size.width, self.frame.size.height);
        _isInitialized = YES;
    }

    if (self.datePickerMode == FlatDatePickerModeDate ||
        self.datePickerMode == FlatDatePickerModeDateAndTime ||
        self.datePickerMode == FlatDatePickerModeMonthAndYear) {

        if ( self.datePickerMode != FlatDatePickerModeMonthAndYear ) {
            int indexDays = [self getIndexForScrollViewPosition:_scollViewDays];
            [self highlightLabelInArray:_labelsDays atIndex:indexDays];
        }

        int indexMonths = [self getIndexForScrollViewPosition:_scollViewMonths];
        [self highlightLabelInArray:_labelsMonths atIndex:indexMonths];

        int indexYears = [self getIndexForScrollViewPosition:_scollViewYears];
        [self highlightLabelInArray:_labelsYears atIndex:indexYears];
    }

    if (self.datePickerMode == FlatDatePickerModeTime || self.datePickerMode == FlatDatePickerModeDateAndTime) {

        int indexHours = [self getIndexForScrollViewPosition:_scollViewHours];
        [self highlightLabelInArray:_labelsHours atIndex:indexHours];

        int indexMinutes = [self getIndexForScrollViewPosition:_scollViewMinutes];
        [self highlightLabelInArray:_labelsMinutes atIndex:indexMinutes];

        int indexSeconds = [self getIndexForScrollViewPosition:_scollViewSeconds];
        [self highlightLabelInArray:_labelsSeconds atIndex:indexSeconds];
    }

    if (IS_PHONE) {
        [UIView beginAnimations:@"FlatDatePickerShow" context:nil];
        [UIView setAnimationDelegate:self];
        [UIView setAnimationDuration:kFlatDatePickerAnimationDuration];
        [UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
        [UIView setAnimationDelegate:self];
        [UIView setAnimationDidStopSelector:@selector(animationShowDidFinish)];
    }

    self.frame = CGRectMake(self.frame.origin.x, _parentView.frame.size.height - kFlatDatePickerHeight, self.frame.size.width, self.frame.size.height);

    if (IS_PHONE) [UIView commitAnimations];
}

}

由于按钮和标题的初始y坐标设置为0.0，而datepicker的初始y坐标是_parentView.frame.size.height，这是屏幕的底部，因此在运行之后它们是如何相互靠近的“show”方法???

另外，当我尝试使用以下代码在datepicker正下方添加一个确认按钮时，还有另一个问题：

_buttonValid = [[UIButton alloc] initWithFrame:CGRectMake(0.0, self.frame.size.height, self.frame.size.width, kFlatDatePickerHeaderHeight)];
[self addSubview:_buttonValid]

运行后，按钮被添加到正确的位置，但按下时没有响应（在按钮的位置发生变化之前从未发生过）。

混淆了addSubview的用法

0 个答案: