【代码笔记】和当前时间比较

代码：

#import "RootViewController.h"

@interface RootViewController () @end

@implementation RootViewController - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil { self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]; if (self) { // Custom initialization
 } return self; } - (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view. //获得指定日期的格式
    NSLog(@"---%@----",[self changeTheDate:@"2013-04-18" ByDateType:@"yyyy-M-dd"]); //星期几
    NSLog(@"---%@---",[self getTheWeekDay:@"2013-04-18"]); //一年的第几周，每周的第几天，比较两天是不是同一个星期
    NSDate* today = [NSDate date]; NSLog(@"--%ld---",(long)[self didWeekOfYear:today]); NSLog(@"---%ld---",(long)[self didWeekDay:today]); NSLog(@"---%ld---",(long)[self didSameWeek:today date:today]); } #pragma -mark -获得指定日期的格式
/*获得指定的日期格式 paramDate:日期的字符串表示：“2013-04-18” paramDateType：要转化的日期格式：“yyyy-M-dd” */
- (NSString *)changeTheDate:(NSString *)paramDate ByDateType:(NSString *)paramDateType{ // 将日期转化为需要的格式 yyyy-MM-dd 转化为 yyyy-M-dd
 NSDateFormatter *dateFormatter = [[NSDateFormatter alloc]init]; [dateFormatter setDateFormat:@"yyyy-MM-dd"]; NSDate *tempDate = [dateFormatter dateFromString:paramDate]; [dateFormatter setDateFormat:paramDateType]; NSString *theDate= [dateFormatter stringFromDate:tempDate]; NSString *result=[[NSString alloc] initWithString:theDate] ; return result; } #pragma -mark -星期几
/*星期几*/
- (NSString *)getTheWeekDay:(NSString *)paramDate{ NSDateFormatter *dateFormatter = [[NSDateFormatter alloc]init]; [dateFormatter setDateFormat:@"yyyy-M-dd"]; NSDate *theDate= [dateFormatter dateFromString:paramDate]; NSString *result=nil; NSInteger theWeek=[self didWeekDay:theDate]; switch (theWeek) { case 1: result=@"星期日"; break; case 2: result=@"星期一"; break; case 3: result=@"星期二"; break; case 4: result=@"星期三"; break; case 5: result=@"星期四"; break; case 6: result=@"星期五"; break; case 7: result=@"星期六"; break; default: break; } return result; } #pragma -mark -每周的第几天
//取当前时间是星期几
- (NSInteger) didWeekDay:(NSDate*)date { NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar]; NSDateComponents *weekdayComponents = [gregorian components:(NSDayCalendarUnit | NSWeekdayCalendarUnit) fromDate:date]; NSInteger tempweekday = [weekdayComponents weekday]; return tempweekday; } #pragma -mark -每年的第几周
//取当前时间是每年中的第几周
- (NSInteger) didWeekOfYear:(NSDate*)date { NSInteger unitFlags = NSWeekOfYearCalendarUnit; NSCalendar *gregorian = [NSCalendar currentCalendar]; NSDateComponents *weekdayComponents = [gregorian components:unitFlags fromDate:date]; NSInteger weekOfYear = [weekdayComponents weekOfYear]; return weekOfYear; } #pragma -mark -判断是不是一个星期
//判断是不是同一个星期
- (BOOL) didSameWeek:(NSDate*)date1 date:(NSDate*)date2 { NSInteger week1 = [self didWeekOfYear:date1]; NSInteger week2 = [self didWeekOfYear:date2]; return week1 == week2; } @end