iOS開發筆記 －NSDate用字串初始及轉回字串

NSString -> NSDate
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NSDateFormatter *format = [[[NSDateFormatter alloc] init] autorelease];

format.timeStyle = NSDateFormatterNoStyle;

format.dateFormat = @"yyyy/MM/dd";

NSDate *date = [format dateFromString:@"1970/01/01"];

NSDate -> NSString
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NSDateFormatter *format = [[[NSDateFormatter alloc] init] autorelease];

format.timeStyle = NSDateFormatterNoStyle;

format.dateFormat = @"yyyyMMdd";

__birthField.text = [format stringFromDate:__birthPicker.date];

參考網址：
How can I initialize a date to NSdate?
Objective-C - NSString 和 NSDate 互相轉換