项目实现的效果如下:
datepicker04.gif
对实现细节的要求有:
1开始日期默认选中上个月的第一天,结束日期选中今天;
2显示最近13个月,每月日期个数随月份变化;
3确定时,开始日期不能大于结束日期;
具体实现思路,用NSCalendar获取今天的月份,以此月份为基础,获取前一年的各月,并计算出各月的日期数.在选中月份时,对日期进列的个数进行更新.代码如下:
- (instancetype)init
{
self = [super initWithFrame:[UIScreen mainScreen].bounds];
if (self) {
self.backgroundColor = [UIColor colorWithWhite:0 alpha:0.6];
UIButton *okBtn = [UIButton buttonWithType:UIButtonTypeCustom];
[okBtn setTitle:@"确定" forState:UIControlStateNormal];
okBtn.backgroundColor = [UIColor grayColor];
[self addSubview:okBtn];
[okBtn mas_makeConstraints:^(MASConstraintMaker *make) {
make.left.bottom.right.equalTo(@0);
make.height.equalTo(@44);
}];
okBtn.titleLabel.font = [UIFont systemFontOfSize:16];
[okBtn setTitleColor:[UIColor blueColor] forState:UIControlStateNormal];
[okBtn addTarget:self action:@selector(okBtnClick) forControlEvents:UIControlEventTouchUpInside];
self.firstRowCount = 15;
self.secondRowCount = 15;
UIPickerView *pickV = [[UIPickerView alloc] init];
self.pickV = pickV;
pickV.backgroundColor = [UIColor whiteColor];
pickV.dataSource = self;
pickV.delegate = self;
[self addSubview:pickV];
[pickV mas_makeConstraints:^(MASConstraintMaker *make) {
make.right.left.equalTo(@0);
make.height.equalTo(@150);
make.bottom.equalTo(okBtn.mas_top);
}];
UIView *topV = [[UIView alloc] init];
topV.backgroundColor = [UIColor grayColor];
UILabel *leftL = [GXHoldTool labelWithWeight:1 font:16 text:@"开始日期" textColor:[UIColor blueColor]];
leftL.textAlignment = NSTextAlignmentCenter;
UILabel *rightL = [GXHoldTool labelWithWeight:1 font:16 text:@"结束日期" textColor:[UIColor blueColor]];
rightL.textAlignment = NSTextAlignmentCenter;
[topV addSubview:leftL];
[topV addSubview:rightL];
[leftL mas_makeConstraints:^(MASConstraintMaker *make) {
make.top.bottom.equalTo(@0);
make.left.equalTo(@0);
make.width.equalTo(@(GXScreenWidth / 2));
}];
[rightL mas_makeConstraints:^(MASConstraintMaker *make) {
make.top.bottom.equalTo(@0);
make.right.equalTo(@0);
make.width.equalTo(@(GXScreenWidth / 2));
}];
[self addSubview:topV];
[topV mas_makeConstraints:^(MASConstraintMaker *make) {
make.left.right.equalTo(@0);
make.height.equalTo(@40);
make.bottom.equalTo(pickV.mas_top);
}];
[pickV selectRow:(self.dataSource.firstObject.count - 2) inComponent:0 animated:true];
[pickV selectRow:0 inComponent:1 animated:true];
[pickV selectRow:(self.dataSource.lastObject.count - 1) inComponent:2 animated:true];
[pickV selectRow:(self.secondRowCount - 1) inComponent:3 animated:true];
}
return self;
}
#pragma mark - UIPickerViewDataSource
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView{
return 4;
}
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component{
NSInteger row;
if (component == 0) {
row = self.dataSource.firstObject.count;
}else if(component == 1){
row = self.firstRowCount;
}else if(component == 2){
row = self.dataSource.lastObject.count;
}else if(component == 3){
row = self.secondRowCount;
}
return row;
}
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
[self removeFromSuperview];
}
#pragma mark - UIPickerViewDelegate
- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(nullable UIView *)view{
UILabel *label = [[UILabel alloc] init];
NSString *title;
if (component == 0) {
title = self.dataSource.firstObject[row];
}else if(component == 1 || component == 3){
title = self.daysArray[row];
NSString *str = [NSString stringWithFormat:@"%@%@", self.seletedMonthStr, title];
// GXLog(@"%@", str);
NSDateFormatter *dateF = [NSDateFormatter shareFormatter];
dateF.dateFormat = @"yyyy年MM月dd日";
NSDate *date = [dateF dateFromString:str];
NSCalendar *calendar = [NSCalendar currentCalendar];
if ([calendar isDateInToday:date]) {
title = @"今天";
}
}else if(component == 2){
title = self.dataSource.lastObject[row];
self.seletedMonthStr = title;
}
label.text = title;
label.textAlignment = NSTextAlignmentCenter;
label.font = [UIFont systemFontOfSize:14];
return label;
}
- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component {
if (component == 0) {
NSArray *monthArr = self.dataSource[0];
NSString *monthStr = monthArr[row];
self.seletedMonthStr = monthStr;
self.firstRowCount = [self daysCount:monthStr];
if (row == monthArr.count - 1) {
NSCalendar *calendar = [NSCalendar currentCalendar];
self.firstRowCount = [calendar component:NSCalendarUnitDay fromDate:[NSDate date]];
}
[pickerView reloadComponent:1];
}
else if (component == 2){
NSArray *monthArr = self.dataSource[1];
NSString *monthStr = monthArr[row];
self.seletedMonthStr = monthStr;
self.secondRowCount = [self daysCount:monthStr];
if (row == monthArr.count - 1) {
NSCalendar *calendar = [NSCalendar currentCalendar];
self.secondRowCount = [calendar component:NSCalendarUnitDay fromDate:[NSDate date]];
}
[pickerView reloadComponent:3];
}
}
- (NSInteger)daysCount: (NSString *)dateStr{
NSDateFormatter *dateF = [NSDateFormatter shareFormatter];
NSCalendar *calendar = [NSCalendar currentCalendar];
dateF.dateFormat = @"yyyy年MM月";
NSDate *date = [dateF dateFromString:dateStr];
NSRange days = [calendar rangeOfUnit:NSCalendarUnitDay inUnit:NSCalendarUnitMonth forDate:date];
return days.length;
}
- (void)okBtnClick{
NSInteger first = [self.pickV selectedRowInComponent:0];
NSInteger second = [self.pickV selectedRowInComponent:1];
NSInteger third = [self.pickV selectedRowInComponent:2];
NSInteger forth = [self.pickV selectedRowInComponent:3];
NSString *beginDateStr = [NSString stringWithFormat:@"%@%@", self.dataSource.firstObject[first], self.daysArray[second]];
NSString *endDateStr = [NSString stringWithFormat:@"%@%@", self.dataSource.firstObject[third], self.daysArray[forth]];
NSDateFormatter *dateF = [NSDateFormatter shareFormatter];
dateF.dateFormat = @"yyyy年MM月dd日";
NSDate *beginDate = [dateF dateFromString:beginDateStr];
NSDate *endDate = [dateF dateFromString:endDateStr];
NSTimeInterval dateInterval = [beginDate timeIntervalSinceDate:endDate];
if (dateInterval >= 0) {
UIAlertView *alertV = [[UIAlertView alloc] initWithTitle:@"开始日期不能大于结束日期,请您重新选择" message:nil delegate:self cancelButtonTitle:@"确定" otherButtonTitles:nil];
[alertV show];
}
}
-(NSArray *)dataSource{
if (!_dataSource) {
NSMutableArray *arrM = [NSMutableArray arrayWithCapacity:2];
NSCalendar *calendar = [NSCalendar currentCalendar];
NSInteger year = [calendar component:NSCalendarUnitYear fromDate:[NSDate date]];
NSInteger month = [calendar component:NSCalendarUnitMonth fromDate:[NSDate date]];
NSMutableArray *arrMOne = [NSMutableArray arrayWithCapacity:13];
year = year - 1;
for (int j = 0; j < 13; j++) {
if (month > 12) {
month = 1;
year += 1;
}
NSString *dateOne = [NSString stringWithFormat:@"%zd年%02zd月",year, month];
[arrMOne addObject:dateOne];
month++;
}
[arrM addObject:arrMOne];
[arrM addObject:arrMOne.copy];
_dataSource = arrM;
}
return _dataSource;
}
- (NSArray *)daysArray{
if (!_daysArray) {
NSMutableArray *arrM = [NSMutableArray arrayWithCapacity:31];
for (int i = 0; i < 31; i++) {
NSString *dayStr = [NSString stringWithFormat:@"%02zd日", i+1];
[arrM addObject:dayStr];
}
_daysArray = arrM;
}
return _daysArray;
}
当然,过程中也遇到一些坑,如下图:
datepicker01.gif
项目中是通过返回各个compoment的UILabel来实现日期和列,但是月份列显示倾斜,不受控制,调整UILabel的NSTextAlignment属性无果.
反复试验,不实现UIPickerViewDelegate的以下两个方法可以解决:
- (nullable NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component{
}
- (CGFloat)pickerView:(UIPickerView *)pickerView widthForComponent:(NSInteger)component{
}
个人估计原因,实现以上两个方法后,系统会自动生成显示区域,不受返回的UIView控制,也有可能是pickerView自身存在的bug(就像你知道的DatePicker性能低下一般).
希望遇到以上问题的小伙伴参照后,能顺利解决~
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