Common methods of Objective-c NSString class

Tip: The previous more commonly used 1, the creation of String instance method:?-(Instancetype) Initwithformat: (nsstring*) format formatted to generate a string object? This method is more commonly used, powerful, and uses: [[NSString alloc]initwithformat:@ "I am student at%@ of technology?" @ "Guangdonguniversity"];-(instancetype)? Initwithstring: ( nsstring*) astring generate a String object based on the given string?-(Instancetype)? Initwithutf8string: (const char *) BytesUTF-8 the C string in encoded format generates a String object-(Instancetype) Initwithcharacters: (Constunichar *) characters???? ? ?? ? ?? ? ?? ? ?? ? ?? ? ?? ? ?? ? Length: (nsuinteger) length generates a string object based on the given C string (no encoding) and string length? class Method:?? + (Instancetype) stringWithFormat: (nsstring*) format,... Format generated string? + (Instancetype) stringwithstring: (nsstring*) astring?+ (instancetype) stringwithcharacters: (const unichar* ) chars???? ? ?? ? ?? ? ?? ? ?? ? ?? ? ?? ? ?? ? ?? Length: (Nsuinteger) length?+ (instancetype) stringwithcstring: (const char *) cString???? ? ?? ? ?? ? ?? ? ?? ? ?? ? ?? Encoding: (nsstringencoding) enc?+ (instancetype) stringwithutf8string: (const char *) bytes?2, Common Properties @property (readonly) Nsuinteger?length? Get the length of the string? @property? (ReadOnly,?copy)? Nsstring?*uppercasestring: Convert lowercase letters in a string to uppercase? @property? (readonly,?copy)? Nsstring?*lowercasestring: Convert uppercase letters in a string to lowercase letters? @property? (readonly,?copy)? nsstring?*capitalizedstring; Convert the first letter of a word in a string to uppercase, the rest to lowercase? @property (readonly)? Double?doublevalue@property ( readonly)? Float?floatvalue @property (readonly)? Int?intvalue @property (readonly) Nsinteger?integervalue[email  protected] (readonly)? Long?long?longlongvalue@property (readonly)? Bool?boolvalue get the basic data type of the string? Call method: Str.uppercasestring;?? str.lowercasestring;? Str.capitalizedstring (instance name. Property name)?? 3, Common methods:?? -(nsstring*) Stringbyappendingformat: (NSString *) format, ... Add a formatted string after the string-(nsstring*) Substringfromindex: (Nsuinteger) Anindex intercept the substring (from the Anindex position character (inclusive) to the string? end)-(nsstring*) Substringtoindex: (nsuinteger) Anindex intercept substring (a string of Anindex characters from 0 positions)-(BOOL) containsstring: (nsstring*) STR Determines whether the string contains the STR string-(BOOL) Hasprefix: (NSString *) astring string contains astring string prefix-(bool) Hassuffix: (NSString *) Astring string contains astring string suffix-(BOOL) isequaltostring: (nsstring*) astring judgment string and ASTRis ing equal?-(Nsrange) rangeofstring: (NSString *) astring Find the range (starting position and length) of the astring string in the string that invokes the method-(nsstring*) Stringbyreplacingoccurrencesofstring: (nsstring*) target?? ? ?? ? ?? ? ?? ? ?? ? ?? ? ?? ? ?? ? ?? ? ?? ? ?? ? ?? ? ?? ? ?? ? ?? ? ?? ? ?? Withstring: (nsstring*) replacement? Replace the substring target in the string with the replacement string-(nsstring*) Stringbyreplacingcharactersinrange: (nsrange) range??? ? ?? ? ?? ? ?? ? ?? ? ?? ? ?? ? ?? ? ?? ? ?? ? ?? ? ??? Withstring: (NSString *) Replacement Replace the string in the range specified by range with the replacement string-(Nscomparisonresult) Compare: (NSString *) Astring comparison string and astring string-(NSString *) stringbyappendingstring: (NSString *) astring add string after string astring-(nsstring*) Substringwithrange: (nsrange) arange intercept substring (range determined by location and length in Arange) Nsrange with Nsmakerange (Nsuinteger Loc, Nsuinteger len) method obtained?-(Unichar) Characteratindex: (nsuinteger) index? Gets the character of the string index position (starting at 0)?? -(void) Getcharacters: (Unichar *) buffer stores the content character of the string into the buffer buffer?-(void) Getcharacters: (Unichar *) buffer???? ? ?? ? ?? ? ?? ?? Range: (nsrange) Arange the character of the range specified by rangestored in buffer?? Note: nsmutablestring (variable string) variable classes must be initialized first when defined?-(void) AppendFormat: (nsstring*) format,?... Appends a formatted string to a string-(void) appendString: (nsstring*) astring adds a string after the string astring?-(void) Deletecharactersinrange: (Nsrange) Arange Delete the string arange the specified range-(void) insertstring: (nsstring*) astring?????????????? ? ?? ? ?? Atindex: (nsuinteger) anindex? Insert string astring-(void) Replacecharactersinrange at anindex location: (nsrange) arange??? ? ?? ? ?? ? ?? ? ?? ? ?? ? ?? ? Withstring: (nsstring*) astring? Replace the string arange the specified range with astring-(void) setString: (nsstring*) astring set string to the given string astring?

Common methods for objective-c nsstring classes