将字符串转换成NSDate的

我有一个“DateTimeArray”这个数组包含将字符串转换成NSDate的

DateTimeArray[index 0] = 20.05.2011 12:12:50  
DateTimeArray[index 1]= 20.05.2011 12:13:20 
DateTimeArray[index 2]= 20.05.2011 12:20:10

所有的价值都在串，我想这个字符串转换成NSDate的转换，只需要访问时间不日期
和那么这个时间值将被存储在阵列和这个新阵将用于绘制折线图

我希望有人知道这个问题

非常感谢你

来源

2011-05-23 Pooja

代码如下，

for(int index=0;index<[DateTimeArray count];index++) 
{ 
    NSDateFormatter *df = [[NSDateFormatter alloc] init]; 
    [df setDateFormat:@"HH:mm:ss"]; 
    NSString *timeString=[[[DateTimeArray objectAtIndex:index]componentsSeparatedByString:@" "]objectAtIndex:1]; 
    NSDate *time=[df dateFromString:timeString]; 
    [timeArray addObject:time]; 
    [df release]; 
}

来源

2011-05-23 09:59:28 KingofBliss

@KingoofBliss ，非常感谢你 – Pooja 2011-05-23 10:29:32

@pooja：欢迎你:) – KingofBliss 2011-05-23 10:36:15

@KingofBliss，你能告诉我如何设置GMT + 1，因为它显示我在1小时前 – Pooja 2011-05-23 10:39:46

试试这个

NSDateFormatter *df = [[NSDateFormatter alloc] init]; 
[df setDateFormat:@"HH:mm:ss"]; 
NSDate *formattedDate = [df dateFromString:[DateTimeArray objectAtIndex:requiredIndex]]; 
[df release];

来源

2011-05-23 09:53:08 visakh7

我会使用以下格式：“dd.MM. yyyy HH：mm：ss“ – rckoenes 2011-05-23 09:54:35

如果格式不匹配，你会从字符串中得到零，所以要小心 – KingofBliss 2011-05-23 10:04:51

继承人的一套完整的代码..希望它可以帮助..

NSDateFormatter *formatter = [[NSDateFormatter alloc] init]; 
[formatter setDateFormat:@"HH:mm:ss"]; 
int i=0;//start for{} loop 
NSString *currDate = [formatter dateFromString:[DateTimeArray objectAtIndex:i]]; 
[formatter release];

快乐iCoding ...

来源

2011-05-23 09:57:49

如果格式不匹配字符串，你会从字符串中得到零，所以要小心 – KingofBliss 2011-05-23 10:04:15

最好和更清洁的方法：

NSDateFormatter *df = [[NSDateFormatter alloc] init]; 
[df setDateFormat:@"dd.MM.yyyy HH:mm:ss"]; 

for(int i=0; i < [DateTimeArray count]; ++i) 
{ 
    NSString *string = [DateTimeArray objectAtIndex:i]; 
    NSDate *date = [df dateFromString:string]; 
    [timeArray addObject:time]; 
} 

[df release]; // ALWAYS release unused objects

再到刚刚接触小时，而不是几天，你应该选择每个NSDate*实例所需的组件：

// Get the Gregorian calendar 
NSCalendar *cal = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar]; 

// Get the date 
NSDate* date = [timeArray objectAtIndex:my_index]; 

// Get the hours, minutes, seconds 
NSDateComponents* hour = [cal components:NSHourCalendarUnit fromDate:date]; 
NSDateComponents* minute = [cal components:NSMinuteCalendarUnit fromDate:date]; 
NSDateComponents* second = [cal components:NSSecondCalendarUnit fromDate:date];

来源

2011-05-23 10:03:54 marzapower

NSDateFormatter *timeFormat = [[NSDateFormatter alloc] init]; 
[timeFormat setDateFormat:@"HH:mm:ss"] 
NSString *theTime = [timeFormat dateFromString:date]; 
or 
NSCalendar *calendar = [NSCalendar currentCalendar]; 
NSDateComponents *components = [calendar components:(kCFCalendarUnitHour | kCFCalendarUnitMinute) fromDate:date]; 
NSInteger hour = [components hour]; 
NSInteger minute = [components minute];

来源

2011-05-23 10:04:41 Rams

NSMutableArray *nsdateArray = [NSMutableArray arrayWithCapacity:[DateTimeArray count]]; 
    NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init]; 
    [dateFormat setDateFormat:@"dd.MM.yyyy HH:mm:ss"]; 

    for(NSString *currentString in DateTimeArray){ 
     NSDate *date = [dateFormat dateFromString:currentString]; 
     [nsdateArray addObject:date]; 
    } 
    [dateFormat release]; 
    NSLog(@"ArrayWithDate:%@",[nsdateArray description]);

来源

2011-05-23 10:16:36

将字符串转换成NSDate的

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