UIDatePicker 约束在设备中不起作用

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问题描述

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我在我的项目中使用 UIDatePicker 控件.在xib文件中添加了UIDatePicker，并通过编程方式为datePicker设置了minimumDate、maximumDate等约束条件.这在模拟器中运行良好，但在设备中我可以在 datePicker 中选择任何日期.

I am using UIDatePicker control in my project. Added the UIDatePicker in xib file, and programmatically setting the constraints such as minimumDate, maximumDate to the datePicker. This is working fine in simulator, but in device I am able to select any date in datePicker.

示例代码:

- (void)viewDidLoad
{
    [super viewDidLoad];

    [self.datePicker setMinimumDate:[NSDate date]];
    [self.datePicker setMaximumDate:[[NSDate date] dateByAddingTimeInterval:3*24*60*60]];
}

截图:

注意:我正在研究 xcode5 - DP6.

Note: I am working on xcode5 - DP6.

提前致谢.

推荐答案

为 UIDatePicker 上的 UIControlEventValueChanged 事件添加一个操作并实施检查以查看所选日期大于最大日期或小于最小日期并相应地设置日期，如下所示:

Add an action for the UIControlEventValueChanged event on the UIDatePicker and implement checks to see if the selected date is greater than maximum date or less then the minimum date and set the date accordingly, like so:

- (IBAction)dateValueChanged:(id)sender
{
    NSTimeInterval date = [self.datePicker.date timeIntervalSince1970];
    NSTimeInterval maxmimumDate = [self.datePicker.maximumDate timeIntervalSince1970];
    NSTimeInterval minimumDate = [self.datePicker.minimumDate timeIntervalSince1970];

    if (date < minimumDate) {
        self.datePicker.date = self.datePicker.minimumDate;
    }

    if (date > maxmimumDate) {
        self.datePicker.date = self.datePicker.maximumDate;
    }

    // Use the selected date
    NSLog(@"%@", self.datePicker.date);
}

如果您选择超出范围的日期，这将导致 UIDatePicker 滚动到最大/最小日期.

This will cause the UIDatePicker to scroll to the max/min date if you select a date outside the range.

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