iOS 自定义日期选择器datePickerview

在平时的开发中，经常会用到日期选择器，但如果用的是系统提供的UIDatePicker控件，有时无法满足自己的需求（当然有时觉得丑），所以我们可以通过UIPickerView来自定义一个日期选择器。

下面我写了两个经常会用的日期选择器：

通用日期选择器
有起始、截止范围的日期选择器（联动日期选择器--实在想不出叫啥名字了。。。）

效果图如下：

通用日期选择器

通用日期选择器.PNG

联动日期选择器

联动日期选择器1.PNG

联动日期选择器2.PNG

文件在工程中的位置：

文件.jpg

调用方法：

通用日期选择器调用方法。若只需默认值，则只需把隐藏的pickerview显示出来即可而无需调用下面的方法（self.pickerView.hidden = NO;）。

/**
 配置日期选择器
 
 @param selectedDate    默认选择日期（必须在最大日期和最小日期范围），若nil，则为当前时间
 @param dateFormatter   日期格式，若nil，则为yyyy-MM-dd
 @param datePickerMode  日期选择器组件类型，默认为SLDatePickerModeDate
 */
- (void)setupPickerViewDataWithDefaultSelectedDate:(NSDate *)selectedDate
                                     dateFormatter:(NSString *)dateFormatter
                                    datePickerMode:(SLDatePickerMode)datePickerMode;

示例代码：

 //如果只需要默认值，则屏蔽这行代码
 [self.pickerView setupPickerViewDataWithDefaultSelectedDate:[NSDate date] dateFormatter:@"yyyy-MM-dd" datePickerMode:SLDatePickerModeDate];

联动日期选择器调用方法

/**
 配置日期选择器

 @param selectedDate    默认选择日期（必须在最大日期和最小日期范围），若nil，则为当前时间
 @param maximumDate     最大日期，若nil，则为[NSDate distantFuture]
 @param minimumDate     最小日期，若nil，则为1970-01-01
 @param dateFormatter   日期格式，若nil，则为yyyy-MM-dd
 @param datePickerMode  日期选择器组件类型，默认为SLDatePickerModeDate
 */
- (void)setupPickerViewDataWithDefaultSelectedDate:(NSDate *)selectedDate
                                       maximumDate:(NSDate *)maximumDate
                                       minimumDate:(NSDate *)minimumDate
                                     dateFormatter:(NSString *)dateFormatter
                                    datePickerMode:(SLDatePickerMode)datePickerMode;

示例代码：


[self.associatedPickerView setupPickerViewDataWithDefaultSelectedDate:[[NSDate date] dateBySubtractingYears:1]
                                                              maximumDate:[NSDate date]
                                                              minimumDate:[[NSDate date] dateBySubtractingYears:2]
                                                            dateFormatter:@"yyyy-MM"
                                                           datePickerMode:SLDatePickerModeYearAndMonth];

核心代码实现：

通用日期选择器代码实现

- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component {
    switch (component) {
        case 0: {
            self.selectedYear = row % self.yearRows + self.minimumDate.year;
            
            if (SLDatePickerModeYearAndMonth == self.datePickerMode
                || SLDatePickerModeDate == self.datePickerMode) {
                [self setSelectedMonth:self.selectedMonth];
                
                if (SLDatePickerModeDate == self.datePickerMode) {
                    [self setSelectedDay:self.selectedDay];
                }
            }
        }
            break;
            
        case 1: {
            self.selectedMonth = row % self.monthRows + 1;
            
            if (SLDatePickerModeDate == self.datePickerMode) {
                [self setSelectedDay:self.selectedDay];
            }
        }
            break;
            
        case 2: {
            self.selectedDay = row % self.dayRows + 1;
        }
            break;
    }
    
    [pickerView reloadAllComponents];
}

#pragma mark - Setter
- (void)setSelectedYear:(NSInteger)selectedYear {
    self.yearRows = self.maximumDate.year - self.minimumDate.year + 1;
    
    selectedYear = (selectedYear > self.maximumDate.year) ? self.maximumDate.year : selectedYear;
    selectedYear = (selectedYear < self.minimumDate.year) ? self.minimumDate.year : selectedYear;
    
    _selectedYear = selectedYear;
    
    //每次选择都在中间位置附近，保证看似无限滚动的效果
    NSInteger selectedRow = ((kMaxNumberOfRows / 2) / self.yearRows) * self.yearRows + _selectedYear - self.minimumDate.year;
    
    if (self.selectedRows.count > 0) {
        [self.selectedRows replaceObjectAtIndex:0 withObject:@(selectedRow)];
    } else {
        [self.selectedRows addObject:@(selectedRow)];
    }
    
    [self reloadComponent:0];
    [self selectRow:selectedRow inComponent:0 animated:NO];
}

- (void)setSelectedMonth:(NSInteger)selectedMonth {
    _selectedMonth = selectedMonth;
    
    self.monthRows = 12;
    
    //每次选择都在中间位置附近，保证看似无限滚动的效果
    NSInteger selectedRow = ((kMaxNumberOfRows / 2) / self.monthRows) * self.monthRows + _selectedMonth - 1;
    
    if (self.selectedRows.count > 1) {
        [self.selectedRows replaceObjectAtIndex:1 withObject:@(selectedRow)];
    } else {
        [self.selectedRows addObject:@(selectedRow)];
    }
    
    [self reloadComponent:1];
    [self selectRow:selectedRow inComponent:1 animated:NO];
}

- (void)setSelectedDay:(NSInteger)selectedDay {
    self.dayRows = [NSDate getDaysWithYear:self.selectedYear month:self.selectedMonth];
    
    _selectedDay = (selectedDay > self.dayRows) ? self.dayRows : selectedDay;
    
    //每次选择都在中间位置附近，保证看似无限滚动的效果
    NSInteger selectedRow = ((kMaxNumberOfRows / 2) / self.dayRows) * self.dayRows  + _selectedDay - 1;
    
    if (self.selectedRows.count > 2) {
        [self.selectedRows replaceObjectAtIndex:2 withObject:@(selectedRow)];
    } else {
        [self.selectedRows addObject:@(selectedRow)];
    }
    
    [self reloadComponent:2];
    [self selectRow:selectedRow inComponent:2 animated:NO];
}

联动日期选择器代码实现

- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component {
    switch (component) {
        case 0: {
            self.selectedYear = row % self.yearRows + self.minimumDate.year;
            
            if (SLDatePickerModeYearAndMonth == self.datePickerMode
                || SLDatePickerModeDate == self.datePickerMode) {
                [self setSelectedMonth:self.selectedMonth];
                
                if (SLDatePickerModeDate == self.datePickerMode) {
                    [self setSelectedDay:self.selectedDay];
                }
            }
        }
            break;
            
        case 1: {
            if (self.selectedYear == self.minimumDate.year) {
                self.selectedMonth = row % self.monthRows + self.minimumDate.month;
            } else {
                self.selectedMonth = row % self.monthRows + 1;
            }
            
            if (SLDatePickerModeDate == self.datePickerMode) {
                [self setSelectedDay:self.selectedDay];
            }
        }
            break;
            
        case 2: {
            if ([self.maximumDate isSameYearAsDate:self.minimumDate]
                && [self.maximumDate isSameMonthAsDate:self.minimumDate]) {
                self.selectedDay = row % self.dayRows + self.minimumDate.day;
            } else if (self.selectedYear == self.minimumDate.year) {
                if (self.selectedMonth == self.minimumDate.month) {
                    self.selectedDay = row % self.dayRows + self.minimumDate.day;
                } else {
                    self.selectedDay = row % self.dayRows + 1;
                }
            } else {
                self.selectedDay = row % self.dayRows + 1;
            }
        }
            break;
    }
    
    [pickerView reloadAllComponents];
}

#pragma mark - Setter
- (void)setSelectedYear:(NSInteger)selectedYear {
    self.yearRows = self.maximumDate.year - self.minimumDate.year + 1;
    
    selectedYear = (selectedYear > self.maximumDate.year) ? self.maximumDate.year : selectedYear;
    selectedYear = (selectedYear < self.minimumDate.year) ? self.minimumDate.year : selectedYear;
    
    _selectedYear = selectedYear;
    
    NSInteger selectedRow = (_selectedYear - self.minimumDate.year) % self.yearRows;
    if (self.selectedRows.count > 0) {
        [self.selectedRows replaceObjectAtIndex:0 withObject:@(selectedRow)];
    } else {
        [self.selectedRows addObject:@(selectedRow)];
    }
    
    [self reloadComponent:0];
    [self selectRow:selectedRow inComponent:0 animated:YES];
}

- (void)setSelectedMonth:(NSInteger)selectedMonth {
    NSInteger selectedRow = selectedMonth - 1;
    
    if ([self.maximumDate isSameYearAsDate:self.minimumDate]) {
        self.monthRows = self.maximumDate.month - self.minimumDate.month + 1;
        selectedMonth = (selectedMonth > self.maximumDate.month) ? self.maximumDate.month : selectedMonth;
        selectedRow = (selectedMonth - self.minimumDate.month) % self.monthRows;
    } else if (self.selectedYear == self.maximumDate.year) {
        self.monthRows = self.maximumDate.month;
        selectedMonth = (selectedMonth > self.monthRows) ? self.monthRows : selectedMonth;
        selectedRow = (selectedMonth - 1) % self.monthRows;
    } else if (self.selectedYear == self.minimumDate.year) {
        self.monthRows = 12 - self.minimumDate.month + 1;
        selectedMonth = (selectedMonth < self.minimumDate.month) ? self.minimumDate.month : selectedMonth;
        selectedRow = (selectedMonth - self.minimumDate.month) % self.monthRows;
    } else {
        self.monthRows = 12;
    }
    
    _selectedMonth = selectedMonth;
    
    if (self.selectedRows.count > 1) {
        [self.selectedRows replaceObjectAtIndex:1 withObject:@(selectedRow)];
    } else {
        [self.selectedRows addObject:@(selectedRow)];
    }
    
    [self reloadComponent:1];
    [self selectRow:selectedRow inComponent:1 animated:YES];
}

- (void)setSelectedDay:(NSInteger)selectedDay {
    NSInteger selectedRow = 0;
    
    if ([self.maximumDate isSameYearAsDate:self.minimumDate]
        && [self.maximumDate isSameMonthAsDate:self.minimumDate]) {
        self.dayRows = self.maximumDate.day - self.minimumDate.day + 1;
        selectedDay = (selectedDay > self.maximumDate.day) ? self.maximumDate.day : selectedDay;
        selectedRow = (selectedDay - self.minimumDate.day) % self.dayRows;
    } else if (self.selectedYear == self.maximumDate.year) {
        if (self.selectedMonth == self.maximumDate.month) {
            self.dayRows = self.maximumDate.day;
        } else {
            self.dayRows = [NSDate getDaysWithYear:self.selectedYear month:self.selectedMonth];
        }
        
        selectedDay = (selectedDay > self.dayRows) ? self.dayRows : selectedDay;
        selectedRow = (selectedDay - 1) % self.dayRows;
    } else if (self.selectedYear == self.minimumDate.year) {
        //当前选择年、月下的天数
        NSInteger days = [NSDate getDaysWithYear:self.selectedYear month:self.selectedMonth];
        if (self.selectedMonth == self.minimumDate.month) {
            //需要显示天的行数：（选择月所有天数的和 - 指定最小日期的天数 + 1）。
            //例：8月份有31天，若最小天为13号，则该显示的行数为：31 - 13 + 1 = 19行（从13到31）
            self.dayRows = days - self.minimumDate.day + 1;
            if (selectedDay > days) {//如果选中天数大于当月最大天数
                selectedDay = days;
            }
            
            selectedDay = (selectedDay < self.minimumDate.day) ? self.minimumDate.day : selectedDay;
            selectedRow = (selectedDay - self.minimumDate.day) % self.dayRows;
        } else {
            self.dayRows = days;
            selectedDay = (selectedDay > self.dayRows) ? self.dayRows : selectedDay;
            selectedRow = (selectedDay - 1) % self.dayRows;
        }
    } else {
        self.dayRows = [NSDate getDaysWithYear:self.selectedYear month:self.selectedMonth];
        selectedDay = (selectedDay > self.dayRows) ? self.dayRows : selectedDay;
        selectedRow = (selectedDay - 1) % self.dayRows;
    }
    
    _selectedDay = selectedDay;
    
    if (self.selectedRows.count > 2) {
        [self.selectedRows replaceObjectAtIndex:2 withObject:@(selectedRow)];
    } else {
        [self.selectedRows addObject:@(selectedRow)];
    }
    
    [self reloadComponent:2];
    [self selectRow:selectedRow inComponent:2 animated:YES];
}

好了，代码就贴这么多了，如果有需要的朋友可以到github上面去下载。
里面有部分代码用到 NSDate+Category，可自行查看。

文章 Demo

iOS 自定义日期选择器datePickerview

效果图如下：

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