Objective-c:foundation Frame

Foundation framework

NSString, Nsmutablestring, NSNumber (Basic data Type wrapper class), Nsvalue (special type wrapper class: pointer, array, struct), Nsarray, Nsmutablearray, Nsdectionary, Nsset and so on.

one, immutable string NSString class, mutable string Nsmutablestring class (subclass of immutable string)
1. Creation of String objects

<1> constant String object: The most basic format nsstring *str = @ "DSHSD";

<2> Create a string from a class method: + (nsstring*)stringwithstring: (NSString *)
<3> created by instance method: -(nsstring*)initwithstring: (nsstring*)
<4> format string creation:+ (nsstring*)stringWithFormat: (nsstring* ...)
<5> creation of a C-language string:+ (nsstring*)stringwithutf8string: (char *)
<6> Create a string by file:-(nsstring*)Initwithcontentsoffile:(nsstring *path) usedencoding: (Nsuinteger) Error: (nserror*) <7> creating strings from network data:+ (nsstring*)Stringwithcontentsofurl:(nsurl*) Encoding: (nsstringencoding) Error:(nserror*)

2. Search by String

Note: Nsrange is a struct with two data: Nsuinteger location (the index of the start of the specified string) , nsuinteger Length (Specify string lengths)

<1> search string:

-(Nsrange) rangeofstring: (NSString *)

<2> Find out if a string is starting with a prefix:

-(BOOL) Hasprefix: (NSString *)

<3> Find if the string is starting with what suffix:

-(BOOL) Hassuffix: (NSString *)

<4> intercept strings in a string:

-( nsstring*) Substringwithrange: (nsrange)

or-(nsstring*) Substringfromindex: (Nsuinteger)

3. Comparison of strings

<1> Determine whether two objects are not the same object

-(BOOL) IsEqual: (ID) object;

or-(BOOL) Isequalto: (ID) object;

<2> determine if strings are equal

-(BOOL) isequaltostring: (NSString *) astring;

<3> Comparison of strings

-(Nscomparisonresult) Compare: (nsstring*) string;

The return value of Nscomparisonresult has the following three:

Nsorderedascending: means "<", Nsorderedsame: "=", nsordereddescending: ">"

4. String and other types of transitions

<1> other types converted to strings

+ (nsstring*) Stringwithformat:foomat ...;

<2> string Conversion to Integer, real, Boolean, etc.

-(Nsinteger) IntegerValue

-(int) intvalue;

-(CGFloat) Doublevalue;

-(double) doublevalue;

-(float) floatvalue;

-(BOOL) boolvalue

<4> string converted to C language

-(const void *) utf8string; 5. Variable string nsmutablestring (add, delete, change, check) <1> Create a variable array of fixed capacity

+ (ID) stringwithcapacity: (Nsuinteger) capacity;

<2> Insert content at index

-(void) insertstring: (NSString *) astring Atindex: (nsuinteger) Loc;

<3> Delete Content

-(void) Deletecharactersinrange: (nsrange) range;

<4> Add content (add at trailer)

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

-(void) AppendFormat: (NSString *) format, ... (ns_format_function);

<5> fully set to other strings

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

<6> replacement

-(void) Replacecharactersinrange: (nsrange) Range withstring: (NSString *) astring;

Second, NSNumber class

(1) wrapping a basic data type as a class type that is a basic data type wrapper class

-(ID) Initwithchar: (char) value;

-(ID) Initwithunsignedchar: (unsigned char) value;

-(ID) Initwithshort: (short) value;

-(ID) Initwithunsignedshort: (unsigned short) value;

-(ID) initwithint: (int) value;

-(ID) Initwithunsignedint: (unsigned int) value;

-(ID) Initwithlong: (long) value;

-(ID) Initwithunsignedlong: (unsigned long) value;

-(ID) Initwithlonglong: (Long long) value;

-(ID) Initwithunsignedlonglong: (unsigned long) value;

-(ID) initwithfloat: (float) value;

-(ID) initwithdouble: (double) value;

-(ID) Initwithbool: (BOOL) value;

+ (NSNumber *) Numberwithchar: (char) value;

+ (NSNumber *) Numberwithunsignedchar: (unsigned char) value;

+ (NSNumber *) Numberwithshort: (short) value;

+ (NSNumber *) Numberwithunsignedshort: (unsigned short) value;

+ (NSNumber *) Numberwithint: (int) value;

+ (NSNumber *) Numberwithunsignedint: (unsigned int) value;

+ (NSNumber *) Numberwithlong: (long) value;

+ (NSNumber *) Numberwithunsignedlong: (unsigned long) value;

+ (NSNumber *) Numberwithlonglong: (Long long) value;

+ (NSNumber *) Numberwithunsignedlonglong: (unsigned long long) value;

+ (NSNumber *) Numberwithfloat: (float) value;

+ (NSNumber *) Numberwithdouble: (double) value;

+ (NSNumber *) Numberwithbool: (BOOL) value;

(2) After the packaging of the class data to be removed from the original type

-(char) charvalue;

-(unsigned char) unsignedcharvalue;

-(short) shortvalue;

-(unsigned short) unsignedshortvalue;

-(int) intvalue;

-(unsigned int) unsignedintvalue;

-(long) longvalue;

-(unsigned long) unsignedlongvalue;

-(long long) longlongvalue;

-(unsigned long long) unsignedlonglongvalue;

-(float) floatvalue;

-(double) doublevalue;

-(BOOL) boolvalue;

Third, Nsvalue class

(1) Wrapping a special basic type as an object (for example, struct, array, pointer)

a.//wrapping an array as a class type

+ (Nsvalue *) Valuewithbytes: (const void *) value objctype: (const char *) type;

or + (Nsvalue *) Valuewithpointer: (const void *) pointer;

Remove array type

-(void *) Pointervalue;

b.//wrapping the pointer as a class type

+ (Nsvalue *) Valuewithpointer: (const void *) pointer;

Remove pointer type

-(void *) Pointervalue;

c.//wrapping a struct as a class type (structure commonly used in Foundation: nsrange\nsrect\nssize\nspoint)

First, create the struct: (x, Y is the coordinate origin).

Nsrange range = Nsmakerange (location,length)

Nsrect rect = nsmakerect (x, y, width, height)

Nsrange size = nsmakesize (width,height)

Nsrect point= nsmakepoint (x, y)

Use a struct as a parameter

+ (Nsvalue *) Valuewithrange: (nsrange) range;

+ (Nsvalue *) Valuewithpoint: (nspoint) point;

+ (Nsvalue *) Valuewithsize: (nssize) size;

+ (Nsvalue *) Valuewithrect: (nsrect) rect;

Remove structure Type

-(Nspoint) Pointvalue;

-(nssize) Sizevalue;

-(Nsrect) Rectvalue;

-(Nsrange) Rangevalue;

Objective-c:foundation Frame