如何在iOS中记录日期并提取日期"

Question

我有一个webservice,以这种格式返回日期:

2013-04-14

我如何弄清楚这对应的日期？

Answer 1

此代码将获取您的字符串,将其转换为NSDate对象并提取当天的数字(14)和当天的名称(星期日)

NSString *myDateString = @"2013-04-14";

// Convert the string to NSDate
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
dateFormatter.dateFormat = @"yyyy-MM-dd";
NSDate *date = [dateFormatter dateFromString:myDateString];

// Extract the day number (14)
NSDateComponents *components = [[NSCalendar currentCalendar] components:NSDayCalendarUnit fromDate:date];
NSInteger day = [components day];

// Extract the day name (Sunday)
dateFormatter.dateFormat = @"EEEE";
NSString *dayName = [dateFormatter stringFromDate:date];

// Print
NSLog(@"Day: %d: Name: %@", day, dayName);

注意:此代码适用于ARC.如果是MRC,最后添加[dateFormatter release].

Answer 2

获得工作日的另一种方法可以是:

NSString *myDateString = @"2013-04-14";
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"yyyy-MM-dd"];

NSDate *date = [dateFormatter dateFromString:myDateString];
NSDateComponents *components = [[NSCalendar currentCalendar] components:NSWeekdayCalendarUnit fromDate:date];

NSInteger weekday = [components weekday];
NSString *weekdayName = [dateFormatter weekdaySymbols][weekday - 1];

NSLog(@"%@ is a %@", myDateString, weekdayName);