如何设置每次在UIDatepicker中显示为默认值的最短时间 [英] How to set Minimum time to appear as default in UIDatepicker everytime

问题描述

在Datepicker中我设置了最小和最大时间，其中uidatepicker可以滚动，例如我将3:00 PM设置为最小时间，晚上8:00设置为最大时间，当我运行应用程序时，我希望datepicker显示最小时间不设备的当前时间。我的项目中没有硬编码的UIDatepicker在xib文件中使用过。我设置了最短时间但是当我从control.tag == 1切换到2时最小时间更改以及当我第一次打开应用程序时，datepicker不会从最短时间开始。

In Datepicker i have set Min and Max time where uidatepicker can scroll for example i have set 3:00PM as minimum time and 8:00PM as maximum time , when i run the app i want the datepicker to display the Minimum time not the current time of the device . I have hard coded UIDatepicker in my project havent used in xib file . I have set Min time but when i switch from control.tag ==1 to 2 the minimum time changes and also when i open the app for first time the datepicker doesnt start from minimum time.

更新：

-(IBAction)notificationButtonChanged:(UIButton *)control
{

    if (control.tag == 1)
    {
        self.selectedButton = control.tag;

        [userTimePicker reloadInputViews];

        [components setHour:7];;
        [components setMinute:00];

        NSDate *date1 = [gregorian dateFromComponents:components];

        [components setHour:11];
        [components setMinute:00];

        NSDate *date2 = [gregorian dateFromComponents:components];

        [userTimePicker setDatePickerMode:UIDatePickerModeTime];

        [userTimePicker setMinimumDate:date1];
        [userTimePicker setMaximumDate:date2];

    }

    if (control.tag == 2)
    {
        self.selectedButton = control.tag;

        [userTimePicker reloadInputViews];

        [components setHour:12];
        [components setMinute:00];

        NSDate *date1 = [gregorian dateFromComponents:components];

        [components setHour:17];
        [components setMinute:00];

        NSDate *date2 = [gregorian dateFromComponents:components];

        [userTimePicker setDatePickerMode:UIDatePickerModeTime];

        [userTimePicker setMinimumDate:date1];
        [userTimePicker setMaximumDate:date2];

    }

}

推荐答案

编辑：

int startHour = 7;
int endHour = 11;

NSDate *date1 = [NSDate date];
NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier: NSGregorianCalendar];
NSDateComponents *components = [gregorian components: NSUIntegerMax fromDate: date1];
[components setHour: startHour];
[components setMinute: 0];
[components setSecond: 0];
NSDate *startDate = [gregorian dateFromComponents: components];

[components setHour: endHour];
[components setMinute: 0];
[components setSecond: 0];
NSDate *endDate = [gregorian dateFromComponents: components];

[userTimePicker setDatePickerMode:UIDatePickerModeTime];
[userTimePicker setMinimumDate:startDate];
[userTimePicker setMaximumDate:endDate];
[userTimePicker setDate:startDate animated:YES];
[userTimePicker reloadInputViews];

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