重新格式化字符串

Question

我需要帮助。我在此标签的UIlabel中有此日期04/26/2013。我怎样才能将其格式化为04.26.2013？我已经有以下代码：

UILabel *timelabel = [[UILabel alloc] initWithFrame:CGRectMake(xx, xx, xx, xx)];
[timelabel setText:dateToday];

dateToday值为04/26/2013。

Answer 1

NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
[dateFormat setDateFormat:@"MM.dd.yyyy"];
NSString *stringFromDate = [formatter stringFromDate:[NSDate date]];
NSLog(@"today : %@", stringFromDate);

Answer 2

NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"MM.dd.yyyy"];
NSDate *date = [dateFormatter dateFromString:dateToday];
if(date != nil) {
    NSString *formattedDateString = [dateFormatter stringFromDate:date];
    [timelabel setText:formattedDateString];
} else {
    [timelabel setText:@"Invalid Date"];
}

添加了错误检查。始终检查输入字符串是否是有效的日期字符串。

参考：Date Formatting Guide (though it is for Mac; iOS applies the same)

Answer 3

timelabel.text = [dateToday stringByReplacingOccurrencesOfString:@"/" withString:@"."];