如何仅将 UIDatePicker 的日期添加到标签中 - 例如仅添加“28”当选择的日期是“2011年10月28日”时

发布于 2024-12-09 06:00:56 字数 253 浏览 1 评论 0原文

可能的重复：
UIDatePicker 和 NSDate

我可以这样做吗？如何做？我只需要获取用户输入的日期并将其放入标签中，而不是整个日期（例如旧：28/10/2011 新：28）

谢谢

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明天过后 2024-12-16 06:00:56

如果您的用户输入是文本，您将需要从 NSDateFormatter 开始，然后您可以从日历组件中提取日期。（我建议通过 UIDatePicker 收集日期）

//Start here for a date that is a string
NSString *userinput = @"28/10/2011";

NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:@"dd/MM/yyyy"];
NSDate *date = [formatter dateFromString:userinput];
[formatter release];

//Start here if you already have an `NSDate` object
NSDateComponents *components = [[NSCalendar currentCalendar] components:NSDayCalendarUnit 
                                                               fromDate:date];

NSString *dayForLabel = [NSString stringWithFormat:@"%d", [components day]];

If your user input is text you will need to start with an NSDateFormatter and then you can extract the day from the calendar components. (I recommend collecting the date through a UIDatePicker)

//Start here for a date that is a string
NSString *userinput = @"28/10/2011";

NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:@"dd/MM/yyyy"];
NSDate *date = [formatter dateFromString:userinput];
[formatter release];

//Start here if you already have an `NSDate` object
NSDateComponents *components = [[NSCalendar currentCalendar] components:NSDayCalendarUnit 
                                                               fromDate:date];

NSString *dayForLabel = [NSString stringWithFormat:@"%d", [components day]];

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静谧 2024-12-16 06:00:56

像这样的事情：

NSDate *date = [picker date];

NSCalendar *calendar = [picker calendar];

NSDateComponents *dateComponents = [calendar components:(NSDayCalendarUnit | NSMonthCalendarUnit | NSYearCalendarUnit) fromDate:date];

NSInteger day = [dateComponents day];

label.text = [NSString stringWithFormat:@"%d", day];

Something like this:

NSDate *date = [picker date];

NSCalendar *calendar = [picker calendar];

NSDateComponents *dateComponents = [calendar components:(NSDayCalendarUnit | NSMonthCalendarUnit | NSYearCalendarUnit) fromDate:date];

NSInteger day = [dateComponents day];

label.text = [NSString stringWithFormat:@"%d", day];

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