IOS年、月、日三种日期加减选择器

今天和大家分享一下，我自己写的关于日期分别已年、月、日加减的方法，话不多说直接贴代码：

#import "ViewController.h"@interface ViewController ()@property (nonatomic , weak)UILabel *dataLable;@property (nonatomic , copy)NSDate *currentDate;@property (nonatomic , assign) int type;@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];    self.type = 2;    UIView *view = [[UIView alloc] initWithFrame:CGRectMake(100, 100, 200, 50)];    view.backgroundColor = [UIColor grayColor];    [self.view addSubview:view];    UIButton *leftBtn = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 50, 50)];    [leftBtn setTitle:@"+" forState:UIControlStateNormal];    [leftBtn addTarget:self action:@selector(leftBtn) forControlEvents:UIControlEventTouchUpInside];    [view addSubview:leftBtn];    UILabel *datalable = [[UILabel alloc] initWithFrame:CGRectMake(50, 0, 100, 50)];    self.dataLable = datalable;    NSDateFormatter * dateFormatter = [[NSDateFormatter alloc]init];    NSDate *nowDate = [NSDate date];    self.currentDate = nowDate;    if (self.type == 0) {        [dateFormatter setDateFormat:@"yyyy-MM-dd"];        self.dataLable.text  = [NSString stringWithFormat:@"%@",[dateFormatter stringFromDate:nowDate]];    } else if (self.type == 1) {        [dateFormatter setDateFormat:@"yyyy-MM"];        self.dataLable.text  = [NSString stringWithFormat:@"%@",[dateFormatter stringFromDate:nowDate]];    } else if (self.type == 3) {        [dateFormatter setDateFormat:@"yyyy年"];        self.dataLable.text  = [NSString stringWithFormat:@"%@",[dateFormatter stringFromDate:nowDate]];    } else {        [dateFormatter setDateFormat:@"yyyy-MM"];        NSArray *dateArray = [[dateFormatter stringFromDate:nowDate] componentsSeparatedByString:@"-"];        CGFloat i = [dateArray[1] floatValue] / 3;        NSString *str = [NSString string];        if (i <= 1) {            str = @"一";        } else if (i >1 && i <= 2) {            str = @"二";        } else if (i >2 && i <= 3) {            str = @"三";        } else {            str = @"四";        }        self.dataLable.text  = [NSString stringWithFormat:@"%@年第%@季度", dateArray[0], str];    }    [view addSubview:datalable];    UIButton *rightBtn = [[UIButton alloc] initWithFrame:CGRectMake(150, 0, 50, 50)];    [rightBtn setTitle:@"-" forState:UIControlStateNormal];    [rightBtn addTarget:self action:@selector(rightBtn) forControlEvents:UIControlEventTouchUpInside];    [view addSubview:rightBtn];}- (void)leftBtn {    if (self.type == 0) {        self.dataLable.text = [self getDate:0 month:0 day:1];    } else if (self.type == 1) {        self.dataLable.text = [self getDate:0 month:1 day:0];    } else if (self.type == 3) {        self.dataLable.text = [self getDate:1 month:0 day:0];    } else {        self.dataLable.text = [self getDate:0 month:3 day:0];    }}- (void)rightBtn {    if (self.type == 0) {        self.dataLable.text = [self getDate:0 month:0 day:-1];    } else if (self.type == 1) {        self.dataLable.text = [self getDate:0 month:-1 day:0];    } else if (self.type == 3) {        self.dataLable.text = [self getDate:-1 month:0 day:0];    } else {        self.dataLable.text = [self getDate:0 month:-3 day:0];    }}- (NSString*)getDate:(int)year month:(int)month day:(int)day{    NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];    NSDateComponents *comps = nil;    comps = [calendar components:NSYearCalendarUnit|NSMonthCalendarUnit|NSDayCalendarUnit fromDate:[NSDate date]];    NSDateComponents *adcomps = [[NSDateComponents alloc] init];    [adcomps setYear:year];    [adcomps setMonth:month];    [adcomps setDay:day];    NSDate *newdate = [calendar dateByAddingComponents:adcomps toDate:self.currentDate options:0];    self.currentDate = newdate;    NSDateFormatter *formatter =  [[NSDateFormatter alloc] init];    if (self.type == 0) {        [formatter setDateFormat:@"yyyy-MM-dd"];    } else if (self.type == 1) {        [formatter setDateFormat:@"yyyy-MM"];    } else if (self.type == 3) {        [formatter setDateFormat:@"yyyy年"];    } else {        [formatter setDateFormat:@"yyyy-MM"];    }    NSTimeZone* timeZone = [NSTimeZone timeZoneWithName:@"Asia/beijing"];    [formatter setTimeZone:timeZone];    NSString *dateFromData = [formatter stringFromDate:newdate];    if (self.type == 2) {        NSArray *dateArray = [dateFromData componentsSeparatedByString:@"-"];        CGFloat i = [dateArray[1] floatValue] / 3;        NSString *str = [NSString string];        if (i <= 1) {            str = @"一";        } else if (i >1 && i <= 2) {            str = @"二";        } else if (i >2 && i <= 3) {            str = @"三";        } else {            str = @"四";        }        dateFromData  = [NSString stringWithFormat:@"%@年第%@季度", dateArray[0], str];    }    return dateFromData;}

可以通过type的值来改变日期label的显示，加减按钮分别可以加减日期。