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+#import "KBDatePickerView.h"
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+
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+@interface KBDatePickerView () {
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+ NSDate *_currentDate;
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+}
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+
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+@property UIStackView *datePickerStackView;
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+@property UITableView *monthTable;
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+@property UITableView *dayTable;
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+@property UITableView *yearTable;
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+@property UILabel *monthLabel;
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+@property UILabel *dayLabel;
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+@property UILabel *yearLabel;
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+
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+@end
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+
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+@implementation KBDatePickerView
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+
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+- (NSDate *)date {
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+ if (!_currentDate){
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+ [self setDate:[NSDate date]];
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+ }
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+ return _currentDate;
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+}
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+
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+- (NSCalendar *)calendar {
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+ return [NSCalendar currentCalendar];
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+}
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+
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+- (void)setDate:(NSDate *)date {
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+ _currentDate = date;
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+ //_dateLabel.text = date.description;
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+ [self scrollToCurrentDateAnimated:true];
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+}
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+
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+
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+- (id)init {
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+ self = [super init];
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+ if (![self date]){
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+ [self setDate:[NSDate date]];
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+ }
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+ [self layoutViews];
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+ return self;
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+}
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+
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+- (void)scrollToCurrentDateAnimated:(BOOL)animated {
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+ NSDateComponents *components = [[self calendar] components:NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay fromDate:self.date];
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+ [_monthTable selectRowAtIndexPath:[NSIndexPath indexPathForRow:components.month-1 inSection:0] animated:animated scrollPosition:UITableViewScrollPositionTop];
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+ [_dayTable selectRowAtIndexPath:[NSIndexPath indexPathForRow:components.day-1 inSection:0] animated:animated scrollPosition:UITableViewScrollPositionTop];
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+ [_yearTable selectRowAtIndexPath:[NSIndexPath indexPathForRow:1 inSection:0] animated:animated scrollPosition:UITableViewScrollPositionTop];
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+}
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+
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+- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
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+ if (tableView == _monthTable){
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+ return [self calendar].monthSymbols.count;
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+ } else if (tableView == _dayTable){
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+ NSRange days = [[self calendar] rangeOfUnit:NSCalendarUnitDay inUnit:NSCalendarUnitMonth forDate:self.date];
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+ return days.length;
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+ } else {
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+ return 3;
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+ }
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+}
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+
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+- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
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+
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+ UITableViewCell *cell = nil;
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+ if (tableView == _monthTable){
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+ cell = [tableView dequeueReusableCellWithIdentifier:@"month"];
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+ if (!cell){
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+ cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"month"];
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+ }
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+ cell.textLabel.text = [[self calendar] monthSymbols][indexPath.row];
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+ cell.textLabel.textAlignment = NSTextAlignmentCenter;
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+ } else if (tableView == _dayTable){
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+ cell = [tableView dequeueReusableCellWithIdentifier:@"day"];
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+ if (!cell){
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+ cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"day"];
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+ }
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+ cell.textLabel.text = [NSString stringWithFormat:@"%lu", indexPath.row + 1];
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+ cell.textLabel.textAlignment = NSTextAlignmentCenter;
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+ } else {
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+ cell = [tableView dequeueReusableCellWithIdentifier:@"year"];
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+ if (!cell){
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+ cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"year"];
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+ }
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+ NSInteger year = [[self calendar] component:NSCalendarUnitYear fromDate:self.date];
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+ cell.textLabel.text = [NSString stringWithFormat:@"%lu", year - 1 + indexPath.row];
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+ cell.textLabel.textAlignment = NSTextAlignmentCenter;
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+ }
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+ return cell;
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+}
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+
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+- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
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+
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+ NSDateComponents *components = [[self calendar] components:NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay fromDate:self.date];
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+ if (tableView == _monthTable){
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+ NSInteger month = indexPath.row + 1;
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+ components.month = month;
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+ NSDate *newDate = nil;
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+ do {
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+ newDate = [[self calendar] dateFromComponents:components];
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+ components.day -= 1;
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+ } while (newDate == nil || ([[self calendar] component:NSCalendarUnitMonth fromDate:newDate] != month));
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+ [self setDate:newDate];
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+ [[self dayTable] reloadData];
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+ [[self yearTable] reloadData];
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+ } else if (tableView == _dayTable){
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+ components.day = indexPath.row + 1;
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+ NSDate *newDate = [[self calendar] dateFromComponents:components];
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+ if (newDate){
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+ [self setDate:newDate];
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+ [[self monthTable] reloadData];
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+ [[self yearTable] reloadData];
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+ }
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+ } else {
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+ NSInteger year = [[self calendar] component:NSCalendarUnitYear fromDate:self.date];
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+ components.year = year - 1 + indexPath.row;
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+ NSDate *newDate = nil;
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+ do {
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+ newDate = [[self calendar] dateFromComponents:components];
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+ components.day -= 1;
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+ } while (newDate == nil || ([[self calendar] component:NSCalendarUnitMonth fromDate:newDate] != components.month));
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+ [self setDate:newDate];
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+ [[self monthTable] reloadData];
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+ [[self yearTable] reloadData];
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+ }
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+ if (self.itemSelectedBlock){
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+ self.itemSelectedBlock(self.date);
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+ }
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+}
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+
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+- (CGSize)sizeThatFits:(CGSize)size {
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+ CGSize sup = [super sizeThatFits:size];
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+ return CGSizeMake(720, 128+81+60+40);
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+}
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+
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+- (void)layoutViews {
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+
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+ self.monthLabel = [[UILabel alloc] init];
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+ self.monthLabel.translatesAutoresizingMaskIntoConstraints = false;
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+ self.monthLabel.text = @"Month";
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+ self.yearLabel = [[UILabel alloc] init];
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+ self.yearLabel.translatesAutoresizingMaskIntoConstraints = false;
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+ self.yearLabel.text = @"Year";
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+ self.dayLabel = [[UILabel alloc] init];
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+ self.dayLabel.translatesAutoresizingMaskIntoConstraints = false;
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+ self.dayLabel.text = @"Day";
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+
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+ self.monthTable = [[UITableView alloc] initWithFrame:CGRectZero style:UITableViewStylePlain];
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+ self.yearTable = [[UITableView alloc] initWithFrame:CGRectZero style:UITableViewStylePlain];
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+ self.dayTable = [[UITableView alloc] initWithFrame:CGRectZero style:UITableViewStylePlain];
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+ self.monthTable.delegate = self;
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+ self.monthTable.dataSource = self;
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+ self.yearTable.delegate = self;
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+ self.yearTable.dataSource = self;
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+ self.dayTable.delegate = self;
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+ self.dayTable.dataSource = self;
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+
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+ self.datePickerStackView = [[UIStackView alloc] initWithArrangedSubviews:@[self.monthTable, self.dayTable, self.yearTable]];
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+ self.datePickerStackView.translatesAutoresizingMaskIntoConstraints = false;
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+ self.datePickerStackView.spacing = 10;
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+ self.datePickerStackView.axis = UILayoutConstraintAxisHorizontal;
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+ self.datePickerStackView.alignment = UIStackViewAlignmentFill;
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+ self.datePickerStackView.distribution = UIStackViewDistributionFillEqually;
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+ [self.datePickerStackView.widthAnchor constraintEqualToConstant:720].active = true;
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+ [self.datePickerStackView.heightAnchor constraintEqualToConstant:128].active = true;
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+
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+ [self addSubview:self.datePickerStackView];
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+ [self addSubview:self.monthLabel];
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+ [self addSubview:self.yearLabel];
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+ [self addSubview:self.dayLabel];
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+
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+ [self.datePickerStackView.centerXAnchor constraintEqualToAnchor:self.centerXAnchor].active = true;
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+ [self.datePickerStackView.topAnchor constraintEqualToAnchor:self.dayLabel.bottomAnchor constant:60].active = true;
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+ [self.monthLabel.topAnchor constraintEqualToAnchor:self.topAnchor constant:20].active = true;
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+ [self.dayLabel.topAnchor constraintEqualToAnchor:self.topAnchor constant:20].active = true;
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+ [self.dayLabel.centerXAnchor constraintEqualToAnchor:self.dayTable.centerXAnchor].active = true;
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+ [self.monthLabel.centerXAnchor constraintEqualToAnchor:self.monthTable.centerXAnchor].active = true;
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+ [self.yearLabel.centerXAnchor constraintEqualToAnchor:self.yearTable.centerXAnchor].active = true;
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+ [self.yearLabel.topAnchor constraintEqualToAnchor:self.topAnchor constant:20].active = true;
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+ [self.monthLabel.topAnchor constraintEqualToAnchor:self.topAnchor constant:20].active = true;
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+}
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+
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+@end
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Kevin Bradley