NSString字符串全部API作用解释

iOS8最新API和一些生僻API，做了红色标注，便于大家查阅。

//0.定义一个无符号整型
两个字节 范围[0,65535]

typedef unsigned
short unichar;

//1.提前进入以下六个类告诉编译器，六个都是类的名称

@class NSData,NSArray,NSDictionary,NSCharacterSet,NSURL,NSError,NSLocale;

//2.异常处理字符串，控制台出错信息报告

FOUNDATION_EXPORTNSString *const NSParseErrorException;

//3.宏定义下字符串的最大值

#define NSMaximumStringLength (INT_MAX-1)

//4.字符串进行比较options

typedefNS_OPTIONS(NSUInteger, NSStringCompareOptions) {

NSCaseInsensitiveSearch =1,//两个字符串的比较不区分大小写

NSLiteralSearch = 2,//两个字符串的比较区分大小写

NSBackwardsSearch =4,//从字符串末尾开发查询搜索

NSAnchoredSearch =8,//搜索有限制范围的字符串

NSNumericSearch = 64,//根据字符串里的数字来计算顺序

NSDiacriticInsensitiveSearchNS_ENUM_AVAILABLE(10_5,2_0) =128,

NSWidthInsensitiveSearch NS_ENUM_AVAILABLE(10_5,2_0) =256,//可以忽略字符串的宽度（长度）比较结果

NSForcedOrderingSearchNS_ENUM_AVAILABLE(10_5,2_0) =512,//忽略不区分大小写比较的选项

NSRegularExpressionSearchNS_ENUM_AVAILABLE(10_7,3_2) =1024
//

};

//5.字符串编码的多种选项

enum {

NSASCIIStringEncoding =1,/* 0..127 only */

NSNEXTSTEPStringEncoding =2,

NSJapaneseEUCStringEncoding =3,

NSUTF8StringEncoding =4,

NSISOLatin1StringEncoding =5,

NSSymbolStringEncoding =6,

NSNonLossyASCIIStringEncoding =7,

NSShiftJISStringEncoding =8,         /* kCFStringEncodingDOSJapanese */

NSISOLatin2StringEncoding =9,

NSUnicodeStringEncoding =10,

NSWindowsCP1251StringEncoding = 11,   /* Cyrillic; same as AdobeStandardCyrillic */

NSWindowsCP1252StringEncoding =12,   /* WinLatin1 */

NSWindowsCP1253StringEncoding =13,   /* Greek */

NSWindowsCP1254StringEncoding =14,   /* Turkish */

NSWindowsCP1250StringEncoding =15,   /* WinLatin2 */

NSISO2022JPStringEncoding = 21,       /* ISO 2022 Japanese encoding for e-mail */

NSMacOSRomanStringEncoding =30,

NSUTF16StringEncoding = NSUnicodeStringEncoding,     /* An alias for NSUnicodeStringEncoding */

NSUTF16BigEndianStringEncoding = 0x90000100,         /* NSUTF16StringEncoding encoding with explicit endianness specified */

NSUTF16LittleEndianStringEncoding = 0x94000100,      /* NSUTF16StringEncoding encoding with explicit endianness specified */

NSUTF32StringEncoding =0x8c000100,

NSUTF32BigEndianStringEncoding = 0x98000100,         /* NSUTF32StringEncoding encoding with explicit endianness specified */

NSUTF32LittleEndianStringEncoding = 0x9c000100       /* NSUTF32StringEncoding encoding with explicit endianness specified */

};

//6.字符串编码

typedefNSUInteger NSStringEncoding;

字符串编码转换条件option，下面指定缓冲区转换会用到

typedefNS_OPTIONS(NSUInteger, NSStringEncodingConversionOptions) {

NSStringEncodingConversionAllowLossy =1,

NSStringEncodingConversionExternalRepresentation =2

};

//7.字符转化异常

FOUNDATION_EXPORTNSString *const NSCharacterConversionException;

//8. NSString继承NSObject，并遵守以下三个协议

@interface NSString :NSObject <NSCopying,NSMutableCopying,NSSecureCoding>

//9.只读属性字符串长度length

@property (readonly)NSUInteger length;

//10.选取字符串对应下表的字符

  • -(unichar)characterAtIndex:(NSUInteger)index;

//11.字符串的init初始化方法

  • -(instancetype)initNS_DESIGNATED_INITIALIZER;

//12.当一个xib的控件被加载实例化的时候，系统会默认调用这个方法。

- (instancetype)initWithCoder:(NSCoder *)aDecoderNS_DESIGNATED_INITIALIZER;

@end

//13.NSString的扩展方法

@interface NSString (NSStringExtensionMethods)

//14.截取字符串的指定段

- (void)getCharacters:(unichar *)buffer range:(NSRange)aRange;

//15.截取指定位置Index之后字符串

- (NSString *)substringFromIndex:(NSUInteger)from;

//16.从索引0第一个字符串开始，截取指定长度的字符串

- (NSString *)substringToIndex:(NSUInteger)to;

//17.截取字符串的指定段，返回值为NSString

- (NSString *)substringWithRange:(NSRange)range;

//18.比较两个字符串

- (NSComparisonResult)compare:(NSString *)string;

//19.比较两个字符串，并加上条件

- (NSComparisonResult)compare:(NSString *)string options:(NSStringCompareOptions)mask;

//20.比较两个字符串，并加上某些条件到指定段

- (NSComparisonResult)compare:(NSString *)string options:(NSStringCompareOptions)mask
range:(NSRange)compareRange;

//21.比较两个字符串，并加上某些条件还有本地化语言环境，在指定段进行比较

- (NSComparisonResult)compare:(NSString *)string options:(NSStringCompareOptions)mask
range:(NSRange)compareRange locale:(id)locale;

//22.不区分大小写比较字符串

- (NSComparisonResult)caseInsensitiveCompare:(NSString *)string;

//23.本地化比较字符串

- (NSComparisonResult)localizedCompare:(NSString *)string;

//24.不区分大小写以及本地化比较字符串

- (NSComparisonResult)localizedCaseInsensitiveCompare:(NSString *)string;

//25.本地化标准字符串比较，返回升序降序相等

- (NSComparisonResult)localizedStandardCompare:(NSString *)stringNS_AVAILABLE(10_6,4_0);

//26.比较两个字符串是否相等

- (BOOL)isEqualToString:(NSString *)aString;

//27.测试字符串是否以aString开头

- (BOOL)hasPrefix:(NSString *)aString;

//28.测试字符串是否以aString结尾

- (BOOL)hasSuffix:(NSString *)aString;

//29.判断字符串A是否包含aString字符串B，返回值Bool

- (BOOL)containsString:(NSString *)aStringNS_AVAILABLE(10_10,8_0);

//30.这是iOS8的新特性API 判断字符串A是否包含字符串B，不区分大小写，返回Bool

例：NSSsring * stringA = @“abcd”;

NSSsring * stringB = @“d”;

BOOl  test = [stringA localizedCaseInsensitiveContainsString:stringB];

输出打印值 YES

- (BOOL)localizedCaseInsensitiveContainsString:(NSString *)aString NS_AVAILABLE(10_10, 8_0);

//31.搜索一个字符串是否包含某个字符 rangeOfString前面的参数是要被搜索的字符串，后面的是要搜索的字符

- (NSRange)rangeOfString:(NSString *)aString;

//32.搜索一个字符串是否包含某个字符，并添加筛选条件option

- (NSRange)rangeOfString:(NSString *)aString options:(NSStringCompareOptions)mask;

//33搜索一个字符串是否包含某个字符，添加筛选条件以及搜索的范围range

- (NSRange)rangeOfString:(NSString *)aString options:(NSStringCompareOptions)mask
range:(NSRange)searchRange;

//34.搜索一个字符串是否包含某个字符，添加筛选条件以及搜索的范围range,最后还有本地化的设置

- (NSRange)rangeOfString:(NSString *)aString options:(NSStringCompareOptions)mask
range:(NSRange)searchRange locale:(NSLocale *)localeNS_AVAILABLE(10_5,2_0);

//35.指定字符集进行搜索

- (NSRange)rangeOfCharacterFromSet:(NSCharacterSet *)aSet;

//36.指定字符集进行搜索，并且加上某些限制条件

- (NSRange)rangeOfCharacterFromSet:(NSCharacterSet *)aSet options:(NSStringCompareOptions)mask;

//37.指定字符集进行搜索，并且加上某些限制条件，且在指定的位置段进行

- (NSRange)rangeOfCharacterFromSet:(NSCharacterSet *)aSet options:(NSStringCompareOptions)mask
range:(NSRange)searchRange;

//38.用字符串的字符编码指定索引查找位置

- (NSRange)rangeOfComposedCharacterSequenceAtIndex:(NSUInteger)index;

//39.用字符串的字符编码指定区域段查找位置

- (NSRange)rangeOfComposedCharacterSequencesForRange:(NSRange)rangeNS_AVAILABLE(10_5,2_0);

//40.将aString字符串添加到前面字符串A的后面

- (NSString *)stringByAppendingString:(NSString *)aString;

//41.将多个字符串添加到前面字符串A的后面

- (NSString *)stringByAppendingFormat:(NSString *)format, ...NS_FORMAT_FUNCTION(1,2);

//42.只读属性 double类型

@property (readonly)double doubleValue;

//43.只读属性 float类型

@property (readonly)float floatValue;

//44.只读属性int类型

@property (readonly)int intValue;

//45.只读属性NSInteger类型

@property (readonly)NSInteger integerValueNS_AVAILABLE(10_5,2_0);

// 46.只读属性long long 类型

@property (readonly)longlong longLongValueNS_AVAILABLE(10_5,2_0);

//47.只读属性BOOL类型

@property (readonly)BOOL boolValueNS_AVAILABLE(10_5,2_0); //

//48.将字符串根据传进来的字符串参数separator进行分割，并转化成数组

- (NSArray *)componentsSeparatedByString:(NSString *)separator;

// 49. 将字符串根据传进来的字符编码separator进行分割，并拆分成数组返回

- (NSArray *)componentsSeparatedByCharactersInSet:(NSCharacterSet *)separatorNS_AVAILABLE(10_5,2_0);

//50.

- (NSString *)commonPrefixWithString:(NSString *)aString options:(NSStringCompareOptions)mask;

//51. 将字符串的所有字符转化成大写

@property (readonly,copy)NSString *uppercaseString;

//52.将字符串的所有字符转化为小写

@property (readonly,copy)NSString *lowercaseString;

// 53. 所有单词的首字母转化成大写

@property (readonly,copy)NSString *capitalizedString;

//54.所有字符转化成大写 本地化

- (NSString *)uppercaseStringWithLocale:(NSLocale *)localeNS_AVAILABLE(10_8,6_0);

//55.所有字符串转化成小写 本地化

- (NSString *)lowercaseStringWithLocale:(NSLocale *)localeNS_AVAILABLE(10_8,6_0);

//54.所有单词首字母转化成大写 本地化

- (NSString *)capitalizedStringWithLocale:(NSLocale *)localeNS_AVAILABLE(10_8,6_0);

//55.删除字符串中包含字符集部分的字符 返回字符串

扩展一下，如果想要删除字符串前后的空格或者回车，这样做：

[stringA stringByTrimmingCharactersInSet:   [NSCharacterSetWhitespaceAndNewLineCharacterSet]];

- (NSString *)stringByTrimmingCharactersInSet:(NSCharacterSet *)set;

//56.将字符串padString指定索引段添加到前面字符串后面

- (NSString *)stringByPaddingToLength:(NSUInteger)newLength withString:(NSString
*)padString startingAtIndex:(NSUInteger)padIndex;

//57.指定段分行去字符串

- (void)getLineStart:(NSUInteger *)startPtr end:(NSUInteger *)lineEndPtr
contentsEnd:(NSUInteger *)contentsEndPtr forRange:(NSRange)range;

//58.返回字符串指定段位置和长度

- (NSRange)lineRangeForRange:(NSRange)range;

//59.给字符串指定段分段取字符串

- (void)getParagraphStart:(NSUInteger *)startPtr end:(NSUInteger *)parEndPtr
contentsEnd:(NSUInteger *)contentsEndPtr forRange:(NSRange)range;

//60指定段分段的位置和长度

- (NSRange)paragraphRangeForRange:(NSRange)range;

//61.

typedefNS_OPTIONS(NSUInteger, NSStringEnumerationOptions) {

// Pass in one of the "By" options:

NSStringEnumerationByLines =0,                      // Equivalent to lineRangeForRange:

NSStringEnumerationByParagraphs =1,                 // Equivalent to paragraphRangeForRange:

NSStringEnumerationByComposedCharacterSequences =2, // Equivalent to rangeOfComposedCharacterSequencesForRange:

NSStringEnumerationByWords =3,

NSStringEnumerationBySentences =4,

// ...and combine any of the desired additional options:

NSStringEnumerationReverse =1UL <<8,

NSStringEnumerationSubstringNotRequired =1UL <<9,

NSStringEnumerationLocalized =1UL <<10             // User‘s default locale

};

//62.检查是否在指定范围内是否有匹配的字符串

- (void)enumerateSubstringsInRange:(NSRange)range options:(NSStringEnumerationOptions)opts
usingBlock:(void (^)(NSString *substring,NSRange substringRange,NSRange enclosingRange,
BOOL *stop))blockNS_AVAILABLE(10_6,4_0);

//63.列举枚举字符串所有行

- (void)enumerateLinesUsingBlock:(void (^)(NSString *line,BOOL
*stop))block NS_AVAILABLE(10_6,4_0);

//64.字符串

@property (readonly,copy)NSString *description;

//65.返回字符串哈希地址

@property (readonly)NSUInteger hash;

/*** Encoding methods ***/

//66.字符串最快编码值

@property (readonly)NSStringEncoding fastestEncoding;   //

//67.字符串最小编码值

@property (readonly)NSStringEncoding smallestEncoding;  //

//68.返回指定编码的NSData对象

- (NSData *)dataUsingEncoding:(NSStringEncoding)encoding allowLossyConversion:(BOOL)lossy;
  // External representation

//69.返回指定编码的NSData对象

- (NSData *)dataUsingEncoding:(NSStringEncoding)encoding;                                   //
External representation

//70.判断是否可以无损化转码

- (BOOL)canBeConvertedToEncoding:(NSStringEncoding)encoding;

//71.char编码转化

- (__strongconstchar *)cStringUsingEncoding:(NSStringEncoding)encodingNS_RETURNS_INNER_POINTER;

//72.C字符串转化是够成功

- (BOOL)getCString:(char *)buffer maxLength:(NSUInteger)maxBufferCount encoding:(NSStringEncoding)encoding;//
NO return if conversion not

//73.指定缓存区转换

- (BOOL)getBytes:(void *)buffer maxLength:(NSUInteger)maxBufferCount usedLength:(NSUInteger
*)usedBufferCount encoding:(NSStringEncoding)encoding options:(NSStringEncodingConversionOptions)options range:(NSRange)range remainingRange:(NSRangePointer)leftover;

//74.字符串编码时需要用的字节长度

- (NSUInteger)maximumLengthOfBytesUsingEncoding:(NSStringEncoding)enc;

//75.字符串编码时需要用到最大字节长度

- (NSUInteger)lengthOfBytesUsingEncoding:(NSStringEncoding)enc;

//76.unicode范式D标准化

@property (readonly,copy)NSString *decomposedStringWithCanonicalMapping;

//77.unicode范式c标准化

@property (readonly,copy)NSString *precomposedStringWithCanonicalMapping;

//78.unicode范式KD标准化

@property (readonly,copy)NSString *decomposedStringWithCompatibilityMapping;

//79.unicode范式KC标准化

@property (readonly,copy)NSString *precomposedStringWithCompatibilityMapping;

//80.本地化字符串折叠

- (NSString *)stringByFoldingWithOptions:(NSStringCompareOptions)options locale:(NSLocale
*)locale NS_AVAILABLE(10_5,2_0);

//81.字符串的指定区域段被有条件的替换掉

- (NSString *)stringByReplacingOccurrencesOfString:(NSString *)target withString:(NSString
*)replacement options:(NSStringCompareOptions)options range:(NSRange)searchRangeNS_AVAILABLE(10_5,2_0);

//82.字符串的特定字符串被替换掉

- (NSString *)stringByReplacingOccurrencesOfString:(NSString *)target withString:(NSString
*)replacement NS_AVAILABLE(10_5,2_0);

//83.将字符串的指定区域段字符串被替换掉

- (NSString *)stringByReplacingCharactersInRange:(NSRange)range withString:(NSString
*)replacement NS_AVAILABLE(10_5,2_0);

//84.将字符串转化为char类型

@property (readonly)__strongconstchar *UTF8StringNS_RETURNS_INNER_POINTER;

//85.默认C字符串编码

+ (NSStringEncoding)defaultCStringEncoding;

//86.可用的字符串编码

+ (constNSStringEncoding *)availableStringEncodings;

//87.编码的名称vheng

+ (NSString *)localizedNameOfStringEncoding:(NSStringEncoding)encoding;

//88.指定缓冲区，编码和字节长度初始化NSString对象

- (instancetype)initWithCharactersNoCopy:(unichar *)characters length:(NSUInteger)length
freeWhenDone:(BOOL)freeBuffer;

//89.指定unichar字符，字节长度初始化NSString对象

- (instancetype)initWithCharacters:(constunichar *)characters length:(NSUInteger)length;

//90.转化为NSString对象

- (instancetype)initWithUTF8String:(constchar *)nullTerminatedCString;

//91.指定字符串初始化为NSString对象

- (instancetype)initWithString:(NSString *)aString;

//92.格式化多个字符串初始化NSString对象

- (instancetype)initWithFormat:(NSString *)format, ...NS_FORMAT_FUNCTION(1,2);

//93. 格式化字符串初始化NSString对象

- (instancetype)initWithFormat:(NSString *)format arguments:(va_list)argListNS_FORMAT_FUNCTION(1,0);

//94.本地化格式化多个字符串初始化NSString对象

- (instancetype)initWithFormat:(NSString *)format locale:(id)locale, ...NS_FORMAT_FUNCTION(1,3);

//95.本地化格式化字符串初始化NSString对象

- (instancetype)initWithFormat:(NSString *)format locale:(id)locale arguments:(va_list)argListNS_FORMAT_FUNCTION(1,0);

//96.指定编码转化NSData数据

- (instancetype)initWithData:(NSData *)data encoding:(NSStringEncoding)encoding;

//97.指定编码和字节数初始化NSString对象

- (instancetype)initWithBytes:(constvoid *)bytes length:(NSUInteger)len
encoding:(NSStringEncoding)encoding;

//98.指定缓冲区，编码和字节数初始化NSString对象

- (instancetype)initWithBytesNoCopy:(void *)bytes length:(NSUInteger)len
encoding:(NSStringEncoding)encoding freeWhenDone:(BOOL)freeBuffer;

//99.初始化空字符串

+ (instancetype)string;

//100.初始化NSString字符串

+ (instancetype)stringWithString:(NSString *)string;

//101.返回指定长度unichar的C字符串

+ (instancetype)stringWithCharacters:(constunichar *)characters length:(NSUInteger)length;

//102.转化C字符串为UTF8串

+ (instancetype)stringWithUTF8String:(constchar *)nullTerminatedCString;

//103.初始化NSString对象昂，这种创建方式会自动释放内存，很常用的一种方式

+ (instancetype)stringWithFormat:(NSString *)format, ...NS_FORMAT_FUNCTION(1,2);

//104.初始化NSString自动释放内存，本地化

+ (instancetype)localizedStringWithFormat:(NSString *)format, ...NS_FORMAT_FUNCTION(1,2);

//105.初始化C字符串并且指定编码，在这里需要手动释放内存（init）

- (instancetype)initWithCString:(constchar *)nullTerminatedCString encoding:(NSStringEncoding)encoding;

//106.初始化C字符串并且指定编码，在这里需要自动释放内存

+ (instancetype)stringWithCString:(constchar *)cString encoding:(NSStringEncoding)enc;

//107.读取URL地址数据转化为字符串并且指定编码，在这里init创建需要手动释放内存，已经知道编码

- (instancetype)initWithContentsOfURL:(NSURL *)url encoding:(NSStringEncoding)enc
error:(NSError **)error;

//108.读取FILE地址数据转化为字符串并且指定编码，同样需要手动释放内存，已经知道编码

- (instancetype)initWithContentsOfFile:(NSString *)path encoding:(NSStringEncoding)enc
error:(NSError **)error;

//109.读取URL地址数据转化为字符串并且指定编码，，这里会自动释放内存，已经知道编码

+ (instancetype)stringWithContentsOfURL:(NSURL *)url encoding:(NSStringEncoding)enc
error:(NSError **)error;

//110.读取FILE地址数据转化为字符串并且指定编码，这里也会自定释放内存，已经知道编码

+ (instancetype)stringWithContentsOfFile:(NSString *)path encoding:(NSStringEncoding)enc
error:(NSError **)error;

//111.读取URL地址数据转化为字符串并且指定编码，在这里init创建需要手动释放内存，不知道编码

- (instancetype)initWithContentsOfURL:(NSURL *)url usedEncoding:(NSStringEncoding
*)enc error:(NSError **)error;

//112. 读取FILE地址数据转化为字符串并且指定编码，同样需要手动释放内存，不知道编码

- (instancetype)initWithContentsOfFile:(NSString *)path usedEncoding:(NSStringEncoding
*)enc error:(NSError **)error;

//113.取URL地址数据转化为字符串并且指定编码，，这里会自动释放内存，不知道编码

+ (instancetype)stringWithContentsOfURL:(NSURL *)url usedEncoding:(NSStringEncoding
*)enc error:(NSError **)error;

//114.读取FILE地址数据转化为字符串并且指定编码，这里也会自定释放内存，不知道编码

+ (instancetype)stringWithContentsOfFile:(NSString *)path usedEncoding:(NSStringEncoding
*)enc error:(NSError **)error;

//115.将数据写入URL并且指定编码

- (BOOL)writeToURL:(NSURL *)url atomically:(BOOL)useAuxiliaryFile encoding:(NSStringEncoding)enc
error:(NSError **)error;

//116.将数据写入文件并且指定编码

- (BOOL)writeToFile:(NSString *)path atomically:(BOOL)useAuxiliaryFile encoding:(NSStringEncoding)enc
error:(NSError **)error;

@end

@interface NSMutableString :NSString

//117.使用aString替换前面字符串的指定区域字符

- (void)replaceCharactersInRange:(NSRange)range withString:(NSString *)aString;

@end

//118.可变字符串的扩展方法

@interface NSMutableString (NSMutableStringExtensionMethods)

//119.插入字符串aString，在指定的loc位置

- (void)insertString:(NSString *)aString atIndex:(NSUInteger)loc;

//120.删除指定区域段的字符串

- (void)deleteCharactersInRange:(NSRange)range;

//121.追加字符串aString

- (void)appendString:(NSString *)aString;

//122.追加多个字符串

- (void)appendFormat:(NSString *)format, ...NS_FORMAT_FUNCTION(1,2);

//123.设置新的aString

- (void)setString:(NSString *)aString;

//124.初始化一个容量为capacity大小的字符串，并且需要手动释放内存

- (NSMutableString *)initWithCapacity:(NSUInteger)capacity;

//125.初始化一个容量为capacity大小的字符串，但是不用手动释放内存，这些提前指定的容量，知识用于内存优化，实际大小可以大于设置的容量capacity

+ (NSMutableString *)stringWithCapacity:(NSUInteger)capacity;

//126.指定限制条件，指定区段中的replacement替换成target

- (NSUInteger)replaceOccurrencesOfString:(NSString *)target withString:(NSString
*)replacement options:

(NSStringCompareOptions)options range:(NSRange)searchRange;

@end

//128.关于字符串编码检测的扩展

@interface NSString (NSStringEncodingDetection)

//129.对一份data数据进行转换为字符串，有可选option字典，另外还有是否允许有损失，最终转换之后返回一个编码种类。下面是7种不同option字典选项

+ (NSStringEncoding)stringEncodingForData:(NSData *)data

encodingOptions:(NSDictionary *)opts

convertedString:(NSString **)string

usedLossyConversion:(BOOL *)usedLossyConversion NS_AVAILABLE(10_10, 8_0);

@end

FOUNDATION_EXPORTNSString *const NSStringEncodingDetectionSuggestedEncodingsKeyNS_AVAILABLE(10_10,8_0);

// NSArray of NSNumbers which contain NSStringEncoding values; if this key is not present in the dictionary, all encodings are considered

FOUNDATION_EXPORTNSString *const NSStringEncodingDetectionDisallowedEncodingsKeyNS_AVAILABLE(10_10,8_0);

// NSNumber boolean value; if this key is not present in the dictionary, the default value is NO

FOUNDATION_EXPORTNSString *const NSStringEncodingDetectionUseOnlySuggestedEncodingsKeyNS_AVAILABLE(10_10,8_0);

// NSNumber boolean value; if this key is not present in the dictionary, the default value is YES

FOUNDATION_EXPORTNSString *const NSStringEncodingDetectionAllowLossyKeyNS_AVAILABLE(10_10,8_0);

// NSNumber boolean value; if this key is not present in the dictionary, the default value is NO

FOUNDATION_EXPORTNSString *const NSStringEncodingDetectionFromWindowsKeyNS_AVAILABLE(10_10,8_0);

FOUNDATION_EXPORTNSString *const NSStringEncodingDetectionLossySubstitutionKeyNS_AVAILABLE(10_10,8_0);

FOUNDATION_EXPORTNSString *const NSStringEncodingDetectionLikelyLanguageKeyNS_AVAILABLE(10_10,8_0);

@interface NSString (NSExtendedStringPropertyListParsing)

//130.将字符串转化为属性列表

例如：NSString * stringA = [NSString stringWithFormat:@“Name =xulin ;

age = 23;”];

NSLog(@“%@”,[stringA  propertyList]);

控制台输出为{

Name = xulin ;

age = 23;

}

- (id)propertyList;

//131.字符串转化为字典

NSDictionary * dictionary  = [stringA propertyListFromStringFileFormat];

NSLog(@“%@”,dictionary);

控制台输出为{

Name = xulin ;

age = 23;

}

- (NSDictionary *)propertyListFromStringsFileFormat

@end

//132.下面是一些弃用代码。也就是上面所翻译过的代码。

@interface NSString (NSStringDeprecated)

- (constchar *)cStringNS_RETURNS_INNER_POINTERNS_DEPRECATED(10_0,10_4,2_0,
2_0);

- (constchar *)lossyCStringNS_RETURNS_INNER_POINTER
NS_DEPRECATED(10_0,10_4,2_0,
2_0);

- (NSUInteger)cStringLengthNS_DEPRECATED(10_0,10_4,2_0,
2_0);

- (void)getCString:(char *)bytesNS_DEPRECATED(10_0,10_4,2_0,
2_0);

- (void)getCString:(char *)bytes maxLength:(NSUInteger)maxLengthNS_DEPRECATED(10_0,10_4,2_0,
2_0);

- (void)getCString:(char *)bytes maxLength:(NSUInteger)maxLength range:(NSRange)aRange
remainingRange:(NSRangePointer)leftoverRange
NS_DEPRECATED(10_0,
10_4, 2_0,
2_0);

- (BOOL)writeToFile:(NSString *)path atomically:(BOOL)useAuxiliaryFileNS_DEPRECATED(10_0,10_4,2_0,
2_0);

- (BOOL)writeToURL:(NSURL *)url atomically:(BOOL)atomicallyNS_DEPRECATED(10_0,10_4,2_0,
2_0);

- (id)initWithContentsOfFile:(NSString *)pathNS_DEPRECATED(10_0,10_4,2_0,
2_0);

- (id)initWithContentsOfURL:(NSURL *)urlNS_DEPRECATED(10_0,10_4,2_0,
2_0);

+ (id)stringWithContentsOfFile:(NSString *)pathNS_DEPRECATED(10_0,10_4,2_0,
2_0);

+ (id)stringWithContentsOfURL:(NSURL *)urlNS_DEPRECATED(10_0,10_4,2_0,
2_0);

- (id)initWithCStringNoCopy:(char *)bytes length:(NSUInteger)length freeWhenDone:(BOOL)freeBufferNS_DEPRECATED(10_0,10_4,2_0,
2_0);

- (id)initWithCString:(constchar *)bytes length:(NSUInteger)lengthNS_DEPRECATED(10_0,10_4,2_0,
2_0);

- (id)initWithCString:(constchar *)bytesNS_DEPRECATED(10_0,10_4,2_0,
2_0);

+ (id)stringWithCString:(constchar *)bytes length:(NSUInteger)lengthNS_DEPRECATED(10_0,10_4,2_0,
2_0);

+ (id)stringWithCString:(constchar *)bytesNS_DEPRECATED(10_0,10_4,2_0,
2_0);

- (void)getCharacters:(unichar *)buffer;

@end

enum {

NSProprietaryStringEncoding =65536   /* Installation-specific encoding */

};

#if !defined(_OBJC_UNICHAR_H_)

#define _OBJC_UNICHAR_H_

#endif

#define NS_UNICHAR_IS_EIGHT_BIT 0

@interface NSSimpleCString :NSString {

@package

char *bytes;

int numBytes;

#if __LP64__

int _unused;

#endif

}

@end

@interface NSConstantString :NSSimpleCString

@end

#if __LP64__

#else

externvoid *_NSConstantStringClassReference;

#endif

时间： 2024-10-19 17:37:23

NSString字符串全部API作用解释的相关文章

[转]SQLSERVER一些公用DLL的作用解释

转自:Leo_wlCnBlogs SQLSERVER一些公用DLL的作用解释 如果你的SQLSERVER安装在C盘的话,下面的路径就是相应SQLSERVER版本的公用DLL的存放路径 SQL2005 C:\Program Files\Microsoft SQL Server\90\SDK\Assemblies\ SQL2008 C:\Program Files\Microsoft SQL Server\100\SDK\Assemblies\ SQL2012 C:\Program Files\Mi

黑马程序员---OC基础9【Foundation框架】【NSString介绍】【NSURL读写字符串】【NSString字符串比较】【NSString前后缀检查及搜索】【NSRange使用】

------- iOS培训.Android培训.Java培训.期待与您交流! ---------- [Foundation框架] 1.Foundation框架介绍 1)Foundation框架概念 框架是由许多类.方法.函数.文档按照一定的逻辑组织起来的集合 以便使研发程序变得 更容易在OS X下的Mac操作系统中大约有80个框架为所有程序开发奠定基础的框架称为Foundation 框架 2)Foundation框架的作用 Foundation框架是Mac\iOS中其他框架的基础 Foundat

Atitit.ati&amp;#160;&amp;#160;str&amp;#160;&amp;#160;字符串增强api

Atitit.ati  str  字符串增强api 1. java StringUtils方法全览 分类: Java2011-11-30 17:22 8194人阅读 评论(2) 收藏 举报 javastringapinull org.apache.commons.lang.StringUtils中经常使用的方法,这里主要列举String中没有,且比較实用的方法: 1. 检查字符串是否为空: static boolean isBlank(CharSequence str) 推断字符串是否为空或nu

OC Foundation & NSString 字符串

一 Foundation 简介 Foundation 框架是苹果公司提供给开发人员,提高效率的的工作库. Foundation中提供了了多类,定义在头文件中.例如NSString类: #import <Foundation/NSSortDescriptor.h> #import <Foundation/NSStream.h> #import <Foundation/NSString.h> #import <Foundation/NSTextCheckingResu

NSString字符串

NSString字符串的内容定义以后是不能修改的,是不可变的. 字符串的创建 //1.快速创建 NSString *str1=@"这是一个字符串!"; NSLog(@"str1=%@",str1); //2.alloc创建的字符串//以被1所替代 NSString *str2=[[NSString alloc]initWithString: @"通过alloc创建字符串"]; NSLog(@"str1=%@",str2); /

ios NSString字符串如何转为NSNumber（已解决）

今天同事问我 NSString字符串如何转为NSNumber,思考了一下解决了 思路:先将字符串转为NSInteger类型,再通过NSNumber的创建方法@(数字)即可实现 NSString * str = @"890909"; // 字符串转为NSInteger类型 NSInteger num = [str integerValue]; NSLog(@"%li",num); // 字符串转为NSNumber对象类型 NSNumber * nums = @(num

Java 8 Stream API具体解释

Java 8 Stream API具体解释 一.Stream API介绍 Java 8引入了全新的Stream API,此Stream与Java I/O包里的InputStream和OutputStream是全然不同的概念,它不同于StAX对XML解析的Stream,也不同于Amazon Kinesis对大数据实时处理的Stream.Stream API更像具有Iterable的集合类,但行为和集合类又有所不同,它是对集合对象功能的增强.专注于对集合对象进行各种非常便捷.高效的聚合操作或大批量数

@SuppressWarnings(unchecked)作用解释

解释一: 屏蔽某些编译时的警告信息         在强制类型转换的时候编译器会给出警告        加上 程序代码 @SuppressWarnings("unchecked") 就不会警告了 解释二: 注释类型 当你的编码可能存在警告时,比如安全警告,可以用它来消除 api中是这样描述的 指示应该在注释元素(以及包含在该注释元素中的所有程序元素)中取消显示指定的编译器警告.注意,在给定元素中取消显示的警告集是所有包含元素中取消显示的警告的超集.例如,如果注释一个类来取消显示某个警告

ES6字符串新增API之padStart妙用

ES6在日常开发中用的已经很普遍了,其中对字符串处理能力加强,新增了几个有用的API,例如:trimStart,trimEnd,pasStart, padEnd, stratsWith, endsWith, include, repeat...等等.今天我们要讨论的是pasStart/pasEnd. 曾几何时,我们在处理时间格式化问题的时候,经常会遇到“补零问题”,简单来说,就是不满十位,个位补0,于是就有了如下代码: const seconds = str > 10 ? str : `0${s