1.选说说简单的时间选择器
- (UIDatePicker *) datePicker
{
if(!_datePicker)
{
_datePicker = [[UIDatePicker alloc]init];
_datePicker.center = CGPointMake(180, 300);
//设置时区
_datePicker.locale = [NSLocale localeWithLocaleIdentifier:@"zh_CN"];
//设置时间显示的模式
_datePicker.datePickerMode = UIDatePickerModeDateAndTime;
//设置最小时间(时间范围)
_datePicker.minimumDate = [NSDate dateWithTimeIntervalSinceNow:-50*365*24*60*60];
//设置最大时间
_datePicker.maximumDate = [NSDate dateWithTimeIntervalSinceNow:50*365*24*60*60];
//设置时间显示的间隔(值必须是能被60整除)
//_datePicker.minuteInterval = 1;
//添加监听方法
[_datePicker addTarget:self action:@selector(TimeValueChage) forControlEvents:UIControlEventValueChanged];
}
return _datePicker;
}
2.实现时间选择器的监听回调方法
//时间选择器的监听回调方法
- (void) TimeValueChage
{
//获得当前选择的时间
NSDate *currentDate = self.datePicker.date;
NSDateFormatter *formatter = [[NSDateFormatter alloc]init];
//formatter.dateStyle = NSDateFormatterLongStyle;
formatter.dateFormat = @"yyyy-MM-dd HH:mm:ss";
NSString *strDate = [formatter stringFromDate:currentDate];
_txtTime.text = strDate;
}
3.实列话一个筛选器
- (UIPickerView *)pickerView
{
if(!_pickerView)
{
_pickerView = [[UIPickerView alloc]init];
_pickerView.center = CGPointMake(180, 300);
_pickerView.backgroundColor = [UIColor grayColor];
//设置数据源
_pickerView.dataSource = self;
//设置代理
_pickerView.delegate = self;
}
return _pickerView;
}
4.调用筛选器的代理方法
4.1.设置筛选器列数
//返回列数
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
return 2;
}
4.2 设置行数(这里是返回每列的总行数)
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
//myCityModel是城市和省份的一个数据模型
myCityModel *city = self.arrayCity[0];
if (component==0) {
//返回省份个数
return self.arrayCity.count;
}
else
{
//返回城市第二列总的城市个数
return city.cities.count;
}
}
4.3 设置筛选器每列的数据
//设置对应行列的数据
- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
{
if(component==0)
{
myCityModel *mycitys = self.arrayCity[row];
//返回省份
return mycitys.name;
}
else
{
//获得城市选择列数
NSInteger tempNum = [self.pickerView selectedRowInComponent:0];
//获得对应的城市
myCityModel *mycitys = self.arrayCity[tempNum];
//返回城市
if(mycitys.cities.count<=row)
{
return nil;
}
else
{
return mycitys.cities[row];
}
}
}
4.4 重置省份的数据
//监听值的改变
- (void) pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
if(component==1)
{
//设置选择省份的行数
NSInteger tempNum = [self.pickerView selectedRowInComponent:0];
//获取对象
myCityModel *mycitys = self.arrayCity[tempNum];
self.txtTime.text = [NSString stringWithFormat:@"省份:%@,城市:%@",mycitys.name,mycitys.cities[row]];
}
if (component == 0) {
//重置第二列的省份数据
[self.pickerView reloadComponent:1];
}
}