我正在研究一個iPhone應用程序，我需要在一個標籤中顯示時間。所以我寫了如下：如何在Objective-C中以12小時格式顯示時間？
NSDate *date = [NSDate date];
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"HH:mm a"];
NSString *formattedDateString = [dateFormatter stringFromDate:date];
timeLabel.text = formattedDateString;**
它顯示時間標籤，但在24H格式。
我要顯示12小時格式的時間，即下午3點
我該怎麼辦？
在此先感謝。
[dateFormatter setDateFormat:@"hh:mm a"];
注意小寫的h。
嘿它的如此瘋狂 Tahnk你洙多..亞當 –
這隻適用於如果24小時時間設備設置 - >一般 - >日期和時間 – Mona
@Mona這是不正確的。你需要仔細檢查你做了什麼。並且有一點是正確的 - 它必須在特定的iOS版本上，在這種情況下，請向Apple提交錯誤報告。 –
只要看看UNICODE LOCALE DATA MARKUP LANGUAGE
猜你必須使用的，而不是HH KK ......
大寫字母K顯示0到11範圍內的小時數，而不是1到12. – UIAdam
閱讀該文檔是一個很好的做法。
HH-僅在2,3,4時顯示0。這不是0-12 AM/PM格式。
請參閱「日期格式化程序」瞭解更多詳細信息。
你的情況：
附錄F：日期格式模式
h:mm a -> 3:00 PM
時間顯示爲「16:04」，日期格式設置爲@ 「h：mm a」 –
檢查設備時間是否設置爲12小時格式。 – chetu
Date Formats a: AM/PM
A: 0~86399999 (Millisecond of Day)
c/cc: 1~7 (Day of Week)
ccc: Sun/Mon/Tue/Wed/Thu/Fri/Sat
cccc: Sunday/Monday/Tuesday/Wednesday/Thursday/Friday/Saturday
d: 1~31 (0 padded Day of Month)
D: 1~366 (0 padded Day of Year)
e: 1~7 (0 padded Day of Week)
E~EEE: Sun/Mon/Tue/Wed/Thu/Fri/Sat
EEEE: Sunday/Monday/Tuesday/Wednesday/Thursday/Friday/Saturday
F: 1~5 (0 padded Week of Month, first day of week = Monday)
g: Julian Day Number (number of days since 4713 BC January 1)
G~GGG: BC/AD (Era Designator Abbreviated)
GGGG: Before Christ/Anno Domini
h: 1~12 (0 padded Hour (12hr))
H: 0~23 (0 padded Hour (24hr))
k: 1~24 (0 padded Hour (24hr)
K: 0~11 (0 padded Hour (12hr))
L/LL: 1~12 (0 padded Month)
LLL: Jan/Feb/Mar/Apr/May/Jun/Jul/Aug/Sep/Oct/Nov/Dec
LLLL: January/February/March/April/May/June/July/August/September/October/November/December
m: 0~59 (0 padded Minute)
M/MM: 1~12 (0 padded Month)
MMM: Jan/Feb/Mar/Apr/May/Jun/Jul/Aug/Sep/Oct/Nov/Dec
MMMM: January/February/March/April/May/June/July/August/September/October/November/December
q/qq: 1~4 (0 padded Quarter)
qqq: Q1/Q2/Q3/Q4
qqqq: 1st quarter/2nd quarter/3rd quarter/4th quarter
Q/QQ: 1~4 (0 padded Quarter)
QQQ: Q1/Q2/Q3/Q4
QQQQ: 1st quarter/2nd quarter/3rd quarter/4th quarter
s: 0~59 (0 padded Second)
S: (rounded Sub-Second)
u: (0 padded Year)
v~vvv: (General GMT Timezone Abbreviation)
vvvv: (General GMT Timezone Name)
w: 1~53 (0 padded Week of Year, 1st day of week = Sunday, NB: 1st week of year starts from the last Sunday of last year)
W: 1~5 (0 padded Week of Month, 1st day of week = Sunday)
y/yyyy: (Full Year)
yy/yyy: (2 Digits Year)
Y/YYYY: (Full Year, starting from the Sunday of the 1st week of year)
YY/YYY: (2 Digits Year, starting from the Sunday of the 1st week of year)
z~zzz: (Specific GMT Timezone Abbreviation)
zzzz: (Specific GMT Timezone Name)
Z: +0000 (RFC 822 Timezone)
How to Use:
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"dd/MM/yyyy hh:mm:ss a"];
NSLog(@"%@", [dateFormatter dateFromString:@"12/12/2012 12:12:12 AM"]);
雨燕3.0
dateFormatter.dateFormat = "hh:mm a"
您應該顯示在用戶首選格式的時間 - 用戶在設置 - >常規 - >日期和時間 - > 24小時時間 - o中設置此首選項無論如何，如果你強制12小時上午/下午顯示，那麼你會惹惱美國以外的很多用戶 –