23 Aug 10 [IPhone开发]NSDateFormatter的格式字符串

PS: Jackie214大虾说,这是unicode标准哈. 其他程序的Date格式也是这么干的, 那么有兴趣的英文又好的TX就可以去:http://unicode.org/reports/tr35/#Date_Format_Patterns 逛逛啦..

继续我的文章!

IPhone开发中, OBjective-C中的NSDate是一个挺讨厌的类型, 自己不到转换成字符串的类型,还得带一个NSDateFormatter的类型.

官方文档上对NSDateFormatter的格式串好像没详讲, 或许有,我没找到, 每次使用都是用谷歌摸索.

有幸找到一份比较全的文档, 翻译过来共享:

a: AM/PM (上午/下午)

A: 0~86399999 (一天的第A微秒)

c/cc: 1~7 (一周的第一天, 周天为1)

ccc: Sun/Mon/Tue/Wed/Thu/Fri/Sat (星期几简写)

cccc: Sunday/Monday/Tuesday/Wednesday/Thursday/Friday/Saturday (星期几全拼)

d: 1~31 (月份的第几天, 带0)

D: 1~366 (年份的第几天,带0)

e: 1~7 (一周的第几天, 带0)

E~EEE: Sun/Mon/Tue/Wed/Thu/Fri/Sat (星期几简写)

EEEE: Sunday/Monday/Tuesday/Wednesday/Thursday/Friday/Saturday (星期几全拼)

F: 1~5 (每月的第几周, 一周的第一天为周一)

g: Julian Day Number (number of days since 4713 BC January 1) 未知

G~GGG: BC/AD (Era Designator Abbreviated) 未知

GGGG: Before Christ/Anno Domini 未知

h: 1~12 (0 padded Hour (12hr)) 带0的时, 12小时制

H: 0~23 (0 padded Hour (24hr))  带0的时, 24小时制

k: 1~24 (0 padded Hour (24hr) 带0的时, 24小时制

K: 0~11 (0 padded Hour (12hr)) 带0的时, 12小时制

L/LL: 1~12 (0 padded Month)  第几月

LLL: Jan/Feb/Mar/Apr/May/Jun/Jul/Aug/Sep/Oct/Nov/Dec 月份简写

LLLL: January/February/March/April/May/June/July/August/September/October/November/December 月份全称

m: 0~59 (0 padded Minute) 分钟

M/MM: 1~12 (0 padded Month) 第几月

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) 第几季度

qqq: Q1/Q2/Q3/Q4 季度简写

qqqq: 1st quarter/2nd quarter/3rd quarter/4th quarter 季度全拼

Q/QQ: 1~4 (0 padded Quarter) 同小写

QQQ: Q1/Q2/Q3/Q4 同小写

QQQQ: 1st quarter/2nd quarter/3rd quarter/4th quarter 同小写

s: 0~59 (0 padded Second) 秒数

S: (rounded Sub-Second) 未知

u: (0 padded Year) 未知

v~vvv: (General GMT Timezone Abbreviation) 常规GMT时区的编写

vvvv: (General GMT Timezone Name) 常规GMT时区的名称

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) 一年的第几周, 一周的开始为周日,第一周从去年的最后一个周日起算

W: 1~5 (0 padded Week of Month, 1st day of week = Sunday) 一个月的第几周

y/yyyy: (Full Year) 完整的年份

yy/yyy: (2 Digits Year)  2个数字的年份

Y/YYYY: (Full Year, starting from the Sunday of the 1st week of year) 这个年份未知干嘛用的

YY/YYY: (2 Digits Year, starting from the Sunday of the 1st week of year) 这个年份未知干嘛用的

z~zzz: (Specific GMT Timezone Abbreviation) 指定GMT时区的编写

zzzz: (Specific GMT Timezone Name) Z: +0000 (RFC 822 Timezone) 指定GMT时区的名称

Tags: format, iphone, julian day, nsdate, nsdateformatter, Object-c, sep oct nov, 字符串, 时间, 格式, 模式

 PLSqliteDatabase *db = [[PLSqliteDatabase alloc] initWithPath:  @"/path/to/database"];
 if (![db open])
     NSLog(@"Could not open database");

 if (![db executeUpdate: @"CREATE TABLE example (id INTEGER)"])
     NSLog(@"Table creation failed");
 if (![db executeUpdate: @"INSERT INTO example (id) VALUES (?)", [NSNumber numberWithInteger: 42]])
     NSLog(@"Data insert failed");

 id<PLResultSet> results = [db executeQuery: @"SELECT id FROM example WHERE id = ?", [NSNumber numberWithInteger: 42]];
 while ([results next]) {
     NSLog(@"Value of column id is %d", [results intForColumn: @"id"]);
 }
 // 如果没有关闭结果集不会导致内存泄漏, 但会结果集会被保留直到下一次的查询
 [results close];

 id<PLPreparedStatemet> stmt = [db prepareStatement: @"INSERT INTO example (name, color) VALUES (?, ?)"];
 // 绑定参数
 [stmt bindParameters: [NSArray arrayWithObjects: @"Widget", @"Blue", nil]];
 // 执行插入
 if ([stmt executeUpdate] == NO)
     NSLog(@"INSERT failed");

 // 准备
 id<PLPreparedStatement> stmt = [db prepareStatement: @"INSERT INTO test (name, color) VALUES (:name, :color)"];
 // 使用字典绑定参数
 NSMutableDictionary *parameters = [NSMutableDictionary dictionaryWithCapacity: 2];
 [parameters setObject: @"Widget" forKey: @"name"];
 [parameters setObject: @"Blue" forKey: @"color"];
 [stmt bindParameterDictionary: parameters];
 // 执行插入
 if ([stmt executeUpdate] == NO)
     NSLog(@"INSERT failed");

NSArray *pathArray = [NSArray arrayWithObjects:@"here",
                                                     @"be", @"dragons", nil];
NSLog(@"%@",[pathArray componentsJoinedByString:@" "]);

NSString* str = @"here be dragons";
[str componentsSeparatedByString:@" "];
for(NSString* s in str) NSLog(s);

NSURL* url = [NSURL URLWithString:@"http://aminby.net"];
NSMutableURLRequest* request = [NSMutableURLRequest new];
[request setURL:url];
[request setHTTPMethod:@"GET"];
NSHTTPURLRequest* response;
NSData* data = [NSURLConnection sendSynchronousRequest:request
              returningResponse:&response error:nil];
[NSString* strRet = [[NSString alloc] initWithData:data encoding:NSUTF8String];
NSLog(strRet);
[strRet release];

[NSString stringWithContentsOfURL:(NSURL *)url
            encoding:(NSStringEncoding)enc error:(NSError **)error];
// 或者
[NSString stringWithContentsOfURL:(NSURL *)url];

// options有两个枚举,NSMappedRead这个不懂, NSUncachedRead是不缓存
[NSData dataWithContentsOfURL:(NSURL *)url
        options:(NSUInteger)readOptionsMask
        error:(NSError **)errorPtr]
//  或者
[NSData dataWithContentsOfURL:(NSURL *)url];

NSURL* url = [NSURL URLWithString:@"http://aminby.net"];
NSMutableURLRequest*  request = [NSMutableURLRequest new];
[request setURL:url];
[request  setHTTPMethod:@"GET"];
[request addValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
[request setHTTPBody:@"some param"];
NSHTTPURLRequest* response;
NSData* data =  [NSURLConnection sendSynchronousRequest:request
         returningResponse:&response error:nil];
[NSString* strRet =  [[NSString alloc] initWithData:data encoding:NSUTF8String];
NSLog(strRet);
[strRet  release];