ios - NSDate to String conversion and display in the UILabel

Question

I am trying to get a string from NSDate object type and display it in a label. Here is the code I am using,

NSDateFormatter* dateFormatter = [[NSDateFormatter alloc] init] ;
[dateFormatter setDateStyle:NSDateFormatterLongStyle];
//[dateFormatter setTimeStyle:NSDateFormatterNoStyle];
NSDate *datey = [dateFormatter dateFromString:selectedDate];
NSString *labelData = [dateFormatter stringFromDate:datey];
dateLabel.Text = labelData;

where selectedDate is a String containing date in yyyy-mm-dd format. The label is not showing up the date. But if I try giving it a string like @"someblah", it is displaying. Where am I going wrong?? Help appreciated. Thanks

Answer 1

Your line dateLabel.Text should be dateLabel.text.

So you start with a date string, convert it to a date, and then convert it back to a string using the same formatter. Isn't it easier to use:

dateLabel.text = selectedDate;

In all likelihood you are trying to create an NSDate using a date string that is inconsistent with the format. For example, if the format is @"yyyy-MM-dd" but your selectedDate differs from that format then the formatter won't return a NSDate. You can avoid this by setting the DateFormat to be correct for the selectedDate and then, once parsed, change the DateFormat for the desired output. Or use two NSDateFormatter instances.

Answer 2

尝试指定特定格式而不是NSDateFormatLongStyle，例如

[dateFormatter setDateFormat:@"yyyy-MM-dd"];

我使用谷歌在 2 秒内找到了这个答案。（是的，这是一个提示）