如何獲得作爲字符串的NSDate的本地化日期？

Question

我有一個NSDate對象，並且必須創建一個標籤，用於指示星期幾，如'星期一'，'星期二'，'星期三'等簡短的3字符風格，並且本地化爲任何短代表語言。

日期格式化程序EEE有3個字符，但是如何轉換爲可能只有一個字符的中文等語言？

Answer 1

NSDate *date = [NSDate date]; 
NSDateFormatter *formatter = [[NSDateFormatter alloc] init]; 
[formatter setDateFormat:@"EEE"]; 
NSString *strDate = [formatter stringFromDate:date]; 
[formatter release]; 
//Commented out the following line as weekday can be of one letter (requirement changed) 
//strDate = [strDate substringToIndex:3]; //This way Monday = Mon, Tuesday = Tue 

Answer 2

這將打印你所需要的：

NSDate *date = [NSDate date]; 
NSDateFormatter *formatter = [[NSDateFormatter alloc] init]; 
[formatter setDateFormat:@"EEEE"]; 
NSString *day = [formatter stringFromDate:date]; 
[formatter release]; 
if ([day length] > 3) day = [day substringToIndex:3]; 
NSLog(@"%@", day); 

Answer 3

要使用正確的語言環境，你會想用+ dateFormatFromTemplate:options:locale:方法來設置的NSDateFormatter實例的dateFormat。

NSDate *date = [NSDate date]; 
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init]; 
dateFormatter.dateFormat = [NSDateFormatter dateFormatFromTemplate:@"EEE" options:0 locale:[NSLocale currentLocale]]; 
NSLog(@"Weekday using %@: %@", [[NSLocale currentLocale] localeIdentifier], [dateFormatter stringFromDate:date]); 

// Test what Chinese will look like without changing device locale in settings 
dateFormatter.locale = [[NSLocale alloc] initWithLocaleIdentifier:@"zh_CN"]; 
NSLog(@"Weekday using zh_CN: %@", [dateFormatter stringFromDate:date]); 

此打印：

平日使用EN_US：週四
平日使用zh_CN的：週四