NSDate問題

Question

我有一個格式爲2018-01-19 18:30:00 +0000的NSDate對象。現在我只想改變時間組件。更改時間組件後，NSDate對象將爲2018-01-19 10:00:00。我曾嘗試過各種解決方案，但沒有成功。如果任何人有任何解決這個問題的幫助。謝謝你在前進

NSCalendar *calendar = [NSCalendar currentCalendar]; 
NSDateComponents *components = [calendar components: NSCalendarUnitYear| NSCalendarUnitMonth| NSCalendarUnitDay fromDate:date]; 

[components setHour:hour]; 
[components setMinute:minute]; 
[components setSecond:second]; 
NSDate *newDate = [calendar dateFromComponents:components]; 

另一種解決方案我想是

NSDate *oldDate = date; 
    unsigned unitFlags = NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay; 
    NSCalendar *calendar = [NSCalendar currentCalendar]; 
    NSDateComponents *comps = [calendar components:unitFlags fromDate:oldDate]; 
    comps.hour = 10; 
    comps.minute = 00; 
    comps.second = 00; 
    NSDate *newDate = [calendar dateFromComponents:comps]; 

每次我得到的輸出是輸入日期的下一個日期

Answer 1

這裏是你的代碼只需添加dateformater成甲酸

NSDate *oldDate = [[NSDate alloc]init]; 
unsigned unitFlags = NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay; 
NSCalendar *calendar = [NSCalendar currentCalendar]; 
NSDateComponents *comps = [calendar components:unitFlags fromDate:oldDate]; 
comps.hour = 10; 
comps.minute = 00; 
comps.second = 00; 
NSDate *newDate = [calendar dateFromComponents:comps]; 
NSDateFormatter *formater = [[NSDateFormatter alloc]init]; 
formater.dateFormat = @"YYYY-MM-dd hh:mm:ss"; 
NSLog(@"New Date : %@",[formater stringFromDate:newDate]); 

Answer 2

當你創建一個新的NSDate您可以更改時間成分對象：

NSDate *date = [calendar dateBySettingHour:10 minute:0 second:0 ofDate:[NSDate date] options:0]; 

回答來自：https://stackoverflow.com/a/5611700/4535184

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Answer 3

試試這個

NSDateFormatter *formatter = [NSDateFormatter new]; 
[formatter setDateFormat:@"yyyy-MM-dd HH:mm:ss zzzz"]; 
NSDate *date = [formatter dateFromString:@"2018-01-19 18:30:00 +0000"]; 
NSCalendar *calendar = [NSCalendar currentCalendar]; 
NSDateComponents *components = [calendar components: NSCalendarUnitDay| NSCalendarUnitHour| NSCalendarUnitMinute|NSCalendarUnitDay|NSCalendarUnitMonth|NSCalendarUnitYear fromDate:date]; 
[components setHour:10]; 
[components setMinute:0]; 
[components setSecond:0]; 
NSDate *newDate = [calendar dateFromComponents:components]; 
[formatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"]; 
NSLog(@"%@",[formatter stringFromDate:newDate]);