第五章：第一节 UIDatePicker、UIPickerVie

Step---1:

 UIDatePicker*_datePiceker = [[UIDatePickeralloc] init];

    _datePiceker.frame= CGRectMake(10, 10, 300, 100);

 /*设置日期选择控件的样式

     UIDatePickerModeTime 时间模式

     UIDatePickerModeDate 日期模式

     UIDatePickerModeDateAndTime 日期时间模式

     UIDatePickerModeCountDownTimer 倒计时模式

     */

    _datePiceker.datePickerMode= UIDatePickerModeTime;

 //设置日期选择控件的地区

 NSLocale*_local =  [[NSLocalealloc]initWithLocaleIdentifier:@"zh_Hans_CN"];

    _datePiceker.locale= _local;

 //默认为当天

 NSCalendar*_calendar = [NSCalendarcurrentCalendar];

    _datePiceker.calendar= _calendar;

 //设置时区。

 NSTimeZone*_timeZone = [NSTimeZonedefaultTimeZone];

    _datePiceker.timeZone= _timeZone;

 //日期

 NSDate*_date = [NSDatedate];

    _datePiceker.date= _date;

 //倒计时 先指定模式 UIDatePickerModeCountDownTimer

 NSTimeInterval_minuteInterval = 60* 6;

    _datePiceker.countDownDuration= _minuteInterval;

 //设置最大 和 最小 先指定模式 UIDatePickerModeTime

 NSTimeIntervaloneYearInterval = 365* 24* 60* 60;

 NSDate*today = [NSDatedate];

 NSDate*oneYearFromToday = [today dateByAddingTimeInterval:oneYearInterval];

 NSDate*twoYearFromToday = [today dateByAddingTimeInterval:oneYearInterval * 2];

    _datePiceker.minimumDate= oneYearFromToday;

    _datePiceker.maximumDate= twoYearFromToday;

 //监听事件

[_datePiceker addTarget:selfaction:@selector(dateChange:)forControlEvents:UIControlEventValueChanged];

    [self.viewaddSubview:_datePiceker];

- (void)dateChange:(UIDatePicker*)change{

 NSDate*date = change.date;

 NSDateFormatter*formatter = [[NSDateFormatteralloc] init];

[formatter setDateFormat:@"YYYY-MM-dd HH:mm:ss"];

 NSString*dateString = [formatter stringFromDate:date];

 NSLog(@"当前日期 %@",dateString);

}

Step—2:UIPickerView

 UIPickerView*pickView = [[UIPickerViewalloc] init];

    pickView.frame= CGRectMake(20,self.view.frame.size.height-400,self.view.frame.size.width-40, 400);

 //是否显示选择的行

    pickView.showsSelectionIndicator=YES;

 //获取列数

 //NSInteger number = pickView.numberOfComponents;

    pickView.dataSource= self;遵守协议：UIPickerViewDataSource 

    pickView.delegate= self;遵守协议：UIPickerViewDelegate 

 /*常用方法

     - (NSInteger)numberOfRowsInComponent:(NSInteger)component;

     - (CGSize)rowSizeForComponent:(NSInteger)component;

     - (nullable UIView *)viewForRow:(NSInteger)row forComponent:(NSInteger)component;

     - (void)reloadAllComponents;//刷新所有列

     - (void)reloadComponent:(NSInteger)component;//刷新某一列

     - (void)selectRow:(NSInteger)row inComponent:(NSInteger)component animated:(BOOL)animated;//选中第component列的第row行

     - (NSInteger)selectedRowInComponent:(NSInteger)component;获得第component列的当前选中的行号

     */

    [self.viewaddSubview:pickView];

//选择器中拨轮的个数

-(NSInteger)numberOfComponentsInPickerView:(UIPickerView*)pickerView{

 return3;

}

//选择器某个拨轮的行数数

-(NSInteger)pickerView:(UIPickerView*)pickerView numberOfRowsInComponent:(NSInteger)component{

 return1;

}

//选择器标题

-(NSString*)pickerView:(UIPickerView*)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component{

 return@"---";

}

//被选择的行

-(void)pickerView:(UIPickerView*)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component{

}

//宽

- (CGFloat)pickerView:(UIPickerView*)pickerView widthForComponent:(NSInteger)component{

 returnself.view.frame.size.width-80;

}

//高

- (CGFloat)pickerView:(UIPickerView*)pickerView rowHeightForComponent:(NSInteger)component{

 return60;

}