ios - 字符串值未转换为日期格式

Question

字符串值未转换为日期格式。请参阅下面的代码...

    { 
NSString * TempDate = [NSString stringWithFormat:@"%@ %@ %@",Datelbl.text,yearString,TimeLbl.text]; // result is Thursday, November 21 2013 3:05 PM

        NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
        [dateFormatter setDateFormat : [NSDateFormatter dateFormatFromTemplate:@"EEEE, MMMM d yyyy hh:mm a" options:0 locale:[NSLocale currentLocale]]];

        AppointmentDate = [dateFormatter dateFromString:TempDate];// in .h file  NSDate *AppointmentDate;

    }

我的问题是 appointmentDate 显示 nil 值？？为什么 ？我怎么了!!!

Answer 1

尝试这种格式:

[dateFormatter setDateFormat :@"EEEE',' MMMM d yyyy hh:mm a"];

您需要转义不属于格式的字符(逗号)。

我试过了，现在可以了:

NSString *date = @"Thursday, November 21 2013 3:05 PM";

NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat :@"EEEE',' MMMM d yyyy hh:mm a"];

NSDate *AppointmentDate = [dateFormatter dateFromString:date];

如果您的语言环境不是英语，请添加:

NSLocale *usLocale = [[NSLocale alloc] initWithLocaleIdentifier:@"en_US"];
[dateFormatter setLocale:usLocale];