自定义UIDataPickerView-- QLCustomDatePicker

#import "QLDatePicker.h"

@interface QLDatePicker (){

NSInteger nDays;

}

@property (nonatomic, strong) UIPickerView *picker;

@property (nonatomic, strong) NSCalendar *calendar;

@property (nonatomic, strong) NSDate *minDate;

@property (nonatomic, strong) NSDate *maxDate;

@property (readonly, strong) NSDate *earliestPresentedDate;

@property (nonatomic) BOOL showOnlyValidDates;

@end

@implementation QLDatePicker

- (id)initWithFrame:(CGRect)frame {

self = [super initWithFrame:frame];

if (!self) {

return nil;

}

self.minDate = [NSDate dateWithTimeIntervalSince1970:0];

[self commonInit];

return self;

}

- (id)initWithFrame:(CGRect)frame maxDate:(NSDate *)maxDate minDate:(NSDate *)minDate showValidDatesOnly:(BOOL)showValidDatesOnly

{

self = [super initWithFrame:frame];

if (!self) {

return nil;

}

assert((((minDate) && (maxDate)) && ([minDate compare:maxDate] != NSOrderedDescending)));

self.minDate = minDate;

self.maxDate = maxDate;

self.showOnlyValidDates = showValidDatesOnly;

[self commonInit];

return self;

}

- (id)initWithCoder:(NSCoder *)coder {

self = [super initWithCoder:coder];

if (!self) {

return nil;

}

[self commonInit];

return self;

}

-(NSDate *)earliestPresentedDate

{

return self.showOnlyValidDates ? self.minDate : [NSDate dateWithTimeIntervalSince1970:0];

}

- (void)commonInit {

[self setBackgroundColor:[UIColor blackColor]];

if ([[UIDevice currentDevice].systemVersion floatValue] >= 8.0)

{

self.calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];

}

else

{

self.calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];

}

self.picker = [[UIPickerView alloc] initWithFrame:self.bounds];

self.picker.dataSource = self;

self.picker.delegate = self;

[self initDate];

[self showDateOnPicker:self.date];

[self addSubview:self.picker];

}

-(void)showDateOnPicker:(NSDate *)date

{

self.date = date;

NSDateComponents *components = [self.calendar

components:NSYearCalendarUnit|NSMonthCalendarUnit|NSDayCalendarUnit

fromDate:self.earliestPresentedDate];

NSDate *fromDate = [self.calendar dateFromComponents:components];

components = [self.calendar components:(NSDayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit)

fromDate:fromDate

toDate:date

options:0];

NSInteger hour = [components hour] + 24 * (INT16_MAX / 120);

NSInteger minute = [components minute] + 60 * (INT16_MAX / 120);

NSInteger day = [components day];

[self.picker selectRow:day inComponent:0 animated:YES];

[self.picker selectRow:hour inComponent:1 animated:YES];

[self.picker selectRow:minute inComponent:2 animated:YES];

}

-(void)initDate

{

NSInteger startDayIndex = 0;

NSInteger startHourIndex = 0;

NSInteger startMinuteIndex = 0;

if ((self.minDate) && (self.maxDate) && self.showOnlyValidDates) {

NSDateComponents *components = [self.calendar components:NSDayCalendarUnit

fromDate:self.minDate

toDate:self.maxDate

options:0];

nDays = components.day + 1;

} else {

nDays = INT16_MAX;

}

NSDate *dateToPresent;

if ([self.minDate compare:[NSDate date]] == NSOrderedDescending) {

dateToPresent = self.minDate;

} else if ([self.maxDate compare:[NSDate date]] == NSOrderedAscending) {

dateToPresent = self.maxDate;

} else {

dateToPresent = [NSDate date];

}

NSDateComponents *todaysComponents = [self.calendar components:NSDayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit

fromDate:self.earliestPresentedDate

toDate:dateToPresent

options:0];

startDayIndex = todaysComponents.day;

startHourIndex = todaysComponents.hour;

startMinuteIndex = todaysComponents.minute;

self.date = [NSDate dateWithTimeInterval:startDayIndex*24*60*60+startHourIndex*60*60+startMinuteIndex*60 sinceDate:self.earliestPresentedDate];

}

- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView

{

return 3;

}

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

{

if (component == 0)

{

return nDays;

}

else if (component == 1)

{

return INT16_MAX;

}

else

{

return INT16_MAX;

}

}

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

{

switch (component) {

case 0:

return 170;

break;

case 1:

return 60;

break;

case 2:

return 60;

break;

default:

return 0;

break;

}

}

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

{

return 35;

}

-(UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view

{

UILabel *lblDate = [[UILabel alloc] init];

[lblDate setFont:[UIFont systemFontOfSize:25.0]];

[lblDate setTextColor:[UIColor whiteColor]];

[lblDate setBackgroundColor:[UIColor clearColor]];

if (component == 0) // Date

{

NSDate *aDate = [NSDate dateWithTimeInterval:row*24*60*60 sinceDate:self.earliestPresentedDate];

NSDateComponents *components = [self.calendar components:(NSEraCalendarUnit|NSYearCalendarUnit|NSMonthCalendarUnit|NSDayCalendarUnit) fromDate:[NSDate date]];

NSDate *today = [self.calendar dateFromComponents:components];

components = [self.calendar components:(NSEraCalendarUnit|NSYearCalendarUnit|NSMonthCalendarUnit|NSDayCalendarUnit) fromDate:aDate];

NSDate *otherDate = [self.calendar dateFromComponents:components];

if ([today isEqualToDate:otherDate]) {

[lblDate setText:@"今天"];

} else {

NSDateFormatter *formatter = [[NSDateFormatter alloc] init];

formatter.locale = [NSLocale currentLocale];

formatter.dateFormat = @"MMMd日 E";

[lblDate setText:[formatter stringFromDate:aDate]];

}

lblDate.textAlignment = NSTextAlignmentRight;

}

else if (component == 1) // Hour

{

int max = (int)[self.calendar maximumRangeOfUnit:NSHourCalendarUnit].length;

[lblDate setText:[NSString stringWithFormat:@"%02ld",(row % max)]]; // 02d = pad with leading zeros to 2 digits

lblDate.textAlignment = NSTextAlignmentCenter;

}

else if (component == 2) // Minutes

{

int max = (int)[self.calendar maximumRangeOfUnit:NSMinuteCalendarUnit].length;

[lblDate setText:[NSString stringWithFormat:@"%02ld",(row % max)]];

lblDate.textAlignment = NSTextAlignmentLeft;

}

return lblDate;

}

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

{

NSInteger daysFromStart;

NSDate *chosenDate;

daysFromStart = [pickerView selectedRowInComponent:0];

chosenDate = [NSDate dateWithTimeInterval:daysFromStart*24*60*60 sinceDate:self.earliestPresentedDate];

NSInteger hour = [pickerView selectedRowInComponent:1];

NSInteger minute = [pickerView selectedRowInComponent:2];

// Build date out of the components we got

NSDateComponents *components = [self.calendar components:(NSDayCalendarUnit | NSMonthCalendarUnit | NSYearCalendarUnit) fromDate:chosenDate];

components.hour = hour % 24;

components.minute = minute % 60;

self.date = [self.calendar dateFromComponents:components];

if ([self.date compare:self.minDate] == NSOrderedAscending) {

[self showDateOnPicker:self.minDate];

} else if ([self.date compare:self.maxDate] == NSOrderedDescending) {

[self showDateOnPicker:self.maxDate];

}

if ((self.delegate) && ([self.delegate respondsToSelector:@selector(dateChanged:)])) {

[self.delegate dateChanged:self];

}

}

@end

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