NSDateFormatter - SetDateFormat

Question

我有一个文本字段，用户可以用这种格式插入日期和时间： MMDDHHMM（11230530）我希望标签定于11月23日上午5点30分。 我试过了：

NSString *data = [NSString stringWithFormat:@"%@", [date text]];

  // Convert string to date object
NSDateFormatter *dateFormatter =[[NSDateFormatter alloc]init];
[dateFormatter setDateFormat:@"MMdd hh:mm"];
NSDate *dateFromString = [dateFormatter dateFromString:data];
NSLog(@"%@", dateFromString);

// Convert date object to desired output format
[dateFormatter setDateFormat:@"???????????"];// I don't know how to change the format ;-)
data = [dateFormatter stringFromDate:dateFromString]; 
NSLog(@"%@", data);
[dateFormatter release];

但是我从数据中得到了空白。任何线索？

Answer 1

使用此代码，

NSString *date = [NSString stringWithFormat:@"11230530"];
NSDateFormatter *dateFormatter =[[NSDateFormatter alloc]init];
[dateFormatter setDateFormat:@"MMddHHmm"];

NSDate *dateFromString = [dateFormatter dateFromString:date];
NSLog(@"%@", dateFromString);
[dateFormatter release];

dateFormatter =[[NSDateFormatter alloc]init];
[dateFormatter setDateFormat:@"dd MMMM' at 'hhmm a"];
NSString *stringFromDate=[dateFormatter stringFromDate:dateFromString];
//Use this text to display in that textfield
[dateFormatter release];

Answer 2

以这种方式使用此代码

NSDate *data = [NSDate stringWithFormat:@"%@", [date text]];];
NSDateFormatter *dateFormatter =[[NSDateFormatter alloc]init];
[dateFormatter setDateFormat:@"MMdd hh:mm"];

NSDate *dateFromString = [dateFormatter dateFromString:data];
NSLog(@"%@", dateFromString);

希望它会有所帮助。