如何从NSString转换为NSDate？

Question

如何转换NSString至NSDate？

它必须是yyyy-MM-dd HH:mm:当它从NSString转换为NSDate格式时是这种格式

Answer 1

使用NSDateFormatter的dateFromString:

NSString *dateStr = @"20100212";

// Convert string to date object
NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
[dateFormat setDateFormat:@"yyyyMMdd"];
NSDate *date = [dateFormat dateFromString:dateStr];  

// Convert date object to desired output format
[dateFormat setDateFormat:@"YYYY-MM-dd HH:mm:ss"];
dateStr = [dateFormat stringFromDate:date];  
[dateFormat release];