OC, oc Language

OC, oc Language
OC language-07-OC language-Foundation framework structure

• Nsange/CGRange

  • Used to indicate the range of an element in another element. nsange is equivalent to CGRange.

  • There are two attributes:

    • NSUInteger location: indicates the position of one element in another element.
    • NSUInteger length: the length of the element.
  • If the specified element cannot be found, NSNotFound (integer-1) is returned)

  • Common functions

    • Nsange NSMakeRange (NSUInteger loc, NSUInteger len)
      Create a variable of the nsange type and initialize its two attributes as loc and len.
      And return the created variable.
    • BOOL NSLocationInRange (NSUInteger loc, nsange range)
      Check whether a location is within a certain range and return a BOOL type data
    • BOOL NSEqualRanges (nsange range1, nsange range2)
      Determine whether the two ranges are equal when range1.location = range2.location
      And range1.length = range2.length is equal
    • NSString * NSStringFromRange (nsange range) returns a range
      Convert to string
    • Nsange NSStringFromRange (NSString * string) returns a string
      Convert to range

• NSPoint/CGPoint

  • Used to store a vertex. NSPoint is equivalent to CGPoint.

  • There are two attributes:

    • CGFloat x: indicates the abscissa value of the vertex.
    • CGFloat y: indicates the ordinate value of the vertex.

  • Common functions

    • NSPoint NSMakePoint (CGFloat x, CGFloat y), used to create
      And use x and y to initialize member variables.
    • BOOL NSEqualPoints (NSPoint aPoint, NSPoint bPoint)
      Determine whether aPoint and bPoint are the same point
    • BOOL NSPointInRect (NSPoint aPoint, NSRect aRect) Judgment point
      Whether the aPoint is in the Rectangular aRect
    • NSString * NSStringFromPoint (NSPoint aPoint ),
      Convert to string
    • NSPoint NSPointFromString (NSString * aString ).
      String into a vertex

• NSSize/CGSize

  • Used to store the size of an element. NSSize is equivalent to CGSize.

  • There are two attributes:

    • CGFloat width: indicates the width of the element.
    • CGFloat height: indicates the height of the element.

  • Common functions

    • NSSize NSMakeSize (CGFloat w, CGFloat h), used to create
      NSSize element, and initialize member variables with x and y
    • BOOL NSEqualSizes (NSSize aSize, NSSize bSize), determination ruler
      Is the size of an inch aSize equal to the size of bSize?
    • NSString * NSStringFromSize (NSSize aSize), The Size element aSize
      Convert to string
    • NSSize NSSizeFromString (NSString * aString) to convert the string
      Size element aSize

• NSRect/CGRect

  • Used to store the size information of an element in the upper left corner and the element, NSRecta
    Equivalent to CGRect

  • There are two attributes:

    • CGPoint origin: used to represent the point in the upper left corner of the element.
    • CGSize size: used to indicate the size of the element.

  • Common functions

    • CGRect CGRectMake (CGFloat x, CGFloat y, CGFloat width,
      CGFloat height), used to create a CGRect variable, and initialized with x and y
      The member variable origin. Use width and height to initialize the member variable size.
    • Bool CGRectEqualToRect (CGRect rect1, CGRect rect2 ),
      Compare whether two rect1 and rect2 are equal
    • Bool CGRectContainsPoint (CGRect rect, CGPoint point ),
      Determines whether the point is in the element rect.
    • Bool CGRectContainsRect (CGRect rect1, CGRect rect2 ),
      Determine whether rect1 contains rect2. rect1 and rect2 are not empty and do not include boundaries.

• Example

  # Import <Foundation/Foundation. h> int main () {@ autoreleasepool {BOOL result; // the return value NSString * str for storing the function; // store the converted string // create two vertex objects NSPoint point = NSMakePoint (5, 8); NSPoint point2 = NSMakePoint (50, 8 ); // create two size objects NSSize size = NSMakeSize (10, 20); NSSize size2 = NSMakeSize (10, 20); // create two rectangular objects NSRect rect = NSMakeRect (0, 0, 20, 30); NSRect rect2 = NSMakeRect (0, 1, 20, 30); // judge whether the point and point2 are the same result = NSEqualPoints (point, point2 ); // determine whether the point is in a rectangle rect result = NSPointInRect (point, rect); // determine whether point2 is in a rectangle rect result = NSPointInRect (point2, rect ); // determine whether the size and size2 are the same result = NSEqualSizes (size, size2); // determine whether the rect and rect2 are the same result = NSEqualRects (rect, rect2 ); // determine whether rect contains rect2 result = CGRectContainsRect (rect, rect2); // converts point, size, and rect into a string str = NSStringFromPoint (point ); str = NSStringFromSize (size); str = NSStringFromRect (rect);} return 0 ;}

   

String

• NSString

  • Is an OC class used to operate OC character strings
  • The created OC String object is unchangeable.
  • Generally, a class method corresponds to an object method that completes the same function.
  • , Returns an unchangeable string

  • Common class methods for creating strings (usually starting with a class name)

    • + (Instancetype) string to create an NSString object
    • + (Instancetype) stringWithString :( NSString *) string to create an NSString object and initialize it with the OC String
    • + (Instancetype) stringWithCharacters :( const unichar *) character slength :( NSUInteger) length, create an NSString object through a string pointer and a string of a certain length
    • + (Instancetype) stringWithFormat :( NSString *) format to synthesize a string
    • + (Instancetype) stringWithCString :( const char *) cStringencoding :( NSStringEncoding) enc: Create an OC character string using a C string
    • + (Instancetype) stringWithContentsOfURL :( NSURL *) url encoding :( NSStringEncoding) enc error :( NSError **) error, create an OC character string using the unified Resource Locator URL
    • + (Instancetype) stringWithContentsOfFile :( NSString *) path encoding :( NSStringEncoding) enc error :( NSError **) error; create an OC string through the file content

  • Common methods for creating string objects

    • Object methods are similar to class methods. They generally start with init and are not listed here.

  • Common string operations

    • -(Unichar) characterAtIndex :( NSUInteger) index, returns the character at the specified index position in the string
    • -(Void) getCharacters :( unichar *) buffer range :( nsange), aRange, locate the string at the specified position and store it in the buffer.
    • -(Void) getCharacters :( unichar *) buffer to obtain the string in the buffer.
    • -(NSString *) substringWithRange :( nsange) range, returns the substring of a range
    • -(NSComparisonResult) compare :( NSString *) string, compare two strings, return the variable enumerating NSComparisonResult
    • -(BOOL) containsString :( NSString *) aString to determine whether the string aString is included
    • -(Nsange) rangeOfString :( NSString *) aString, returns the range of aString in this string

• NSMutableString

  • Inherit from NSString to create variable string objects

  • NSMutableString Extension Method

    • -(Void) replaceCharactersInRange :( nsange) range withString :( NSString *) aString, replacing the string of the specified range with aString
    • -(Void) insertString :( NSString *) aString atIndex :( NSUInteger) loc, insert the string aString at the index loc
    • -(Void) deleteCharactersInRange :( nsange) range: Delete the string within the specified range
    • -(Void) appendString :( NSString *) aString. concatenate the aString at the end of the string to expand the string.
    • -(Void) appendFormat :( NSString *) format, which is used to expand the string through a success-to-Child string format
    • -(BOOL) writeToFile :( NSString *) path atomically :( BOOL) useAuxiliaryFile, write the string to the file that represents the path in the string form

Set

• NSArray/NSMutableArray

  • OC array. The array object is any OC object. Non-OC objects must be converted to corresponding OC objects.
    Object
  • The array element cannot be nil, and nil indicates the end of the OC array.
  • You can use @ [] to quickly return an unchangeable array.

  • Common methods for creating Arrays

    • + (Instancetype) array to create an empty array object
    • + (Instancetype) arrayWithObject :( id) anObject, which creates an array through the OC object
    • + (NSArray) ArrayWithContentsOfFile :( NSString) Path creates an array through the file content
    • + (NSArray) ArrayWithContentsOfURL :( NSURL) Url to create an array using the Uniform Resource Locator URL

  • Common methods for creating array objects

    • The object method is similar to the class method and starts with init.

  • Common array operation functions

    • -(NSUInteger) indexOfObject :( id) anObject, locate the index of the specified object
    • -(BOOL) isw.toarray :( NSArray *) otherArray to determine whether the elements in the two arrays are the same
    • -(NSArray *) sortedArrayUsingSelector :( SEL) comparator uses SEL to call a method to sort Arrays
    • -(NSArray *) subarrayWithRange :( nsange) range, returns the range of the array Neutron Array
    • -(Void) enumerateObjectsUsingBlock :( void (^) (id obj, NSUInteger idx, BOOL * stop) block to enumerate the elements in the array and call the block. It is usually used to traverse an array.
  • NSMutableArray inherits from NSArray and creates a variable array.

  • NSMutableArray Extension Method

    • -(Void) addObject :( id) anObject to add an OC object to the array
    • -(Void) insertObject :( id) anObject atIndex :( NSUInteger) index inserts an OC object at the specified index location
    • -(Void) removeObjectAtIndex :( NSUInteger) index: Delete the object at a certain index location.
    • -(Void) removeAllObjects: delete all array elements.
    • -(Void) replaceObjectAtIndex :( NSUInteger) index withObject :( id) anObject: Replace the object at the specified index location with the specified object
    • -(Void) removeObject :( id) anObject inRange :( nsange) range: delete an object in a certain range.

• NSSet/NSMutableSet

  • NSSet, unordered array, immutable
  • NSMutableSet, unordered array, variable

• NSDictionary/NSMutableDictionary

  • NSDictionary, unchangeable dictionary class
  • The element is Object: key-value pair. The key value must be unique and the key-value pair is unordered.

  • Common methods for creating dictionary objects

    • + (Instancetype) dictionaryWithObject :( id) object forKey :( id <NSCopying>) key, which creates a dictionary through key-value pairs
    • -(Instancetype) initWithObjects :( const id []) objects forKeys :( const id []) keys count :( NSUInteger) cnt, create a dictionary through the objects array and keys Array
    • + (Instancetype) dictionaryWithObjectsAndKeys :( id) firstObject,... create an array through multiple key-value pairs

  • Common dictionary operation functions

    • -(BOOL) isEqualToDictionary :( NSDictionary *) otherDictionary checks whether the two dictionaries are equal
    • -(NSArray) ObjectsForKeys :( NSArray) Keys notFoundMarker :( id) marker, returns an object array through a key-value Array
    • -(Void) enumerateKeysAndObjectsUsingBlock :( void (^) (id key, id obj, BOOL * stop) blocks use blocks to traverse dictionaries
    • -(Void) removeObjectForKey :( id) aKey, delete the object with the specified key value
    • -(Void) removeAllObjects: delete all objects.

NSNumber and NSValue

• NSValue

  • OC class, used to encapsulate common type data

• NSNumber

  • It is inherited from NSValue and is usually used to convert common data types such as int and char to corresponding OC objects.

  • Common initialization Methods

    • + (NSNumber *) numberWithChar :( char) value to convert the char type to an OC object
    • Other methods are similar to the preceding method. You only need to replace char with other type names, such as int and long.

  • Common object initialization Methods

    • -(NSNumber *) initWithInt :( int) value to convert int type data to OC object
    • Other methods are similar to the preceding method. You only need to replace Int with the corresponding data type, such as char and short.

  • Common methods to operate NSNumber objects

    • -(NSComparisonResult) compare :( NSNumber *) otherNumber compares two NSNumber objects and returns the enumerated type
    • -(BOOL) isw.tonumber :( NSNumber *) number. Compare two NSNumber objects and return the BOOL type.

NSDate

• Function

  • OC class, used to store time information
  • You can use NSDateFormatter to specify the time format.

• Common Methods

  • -(Instancetype) initWithTimeIntervalSinceReferenceDate :( NSTimeInterval) ti: Creates a time object and uses ti for initialization. NSTimeInterval is essentially a long object.
  • -(NSTimeInterval) timeIntervalSinceDate :( NSDate *) anotherDate, returns the number of seconds from a certain time point to the Code call
  • -(NSComparisonResult) compare :( NSDate *) other, compare two dates, return the enumeration type
  • -(BOOL) is1_todate :( NSDate *) otherDate, compare whether two dates are equal
  • \ TimeIntervalSince1970 is a member variable. You can call the get method to return the time (in seconds) that has elapsed since January 1, 1970)
  • + (Instancetype) date, returns the current 0 Time Zone Time

Example

# Import <Foundation/Foundation. h> int main () {@ autoreleasepool {// defines an NSDate type, which is used to output the NSDate * date = [NSDate date] When the program is executed. // NSDateFormatter * formatter = [[NSDateFormatter alloc] init]; formatter. dateFormat = @ "yyyy/MM/dd/HH: mm: ss"; // converts the time type to the string NSString * time = [formatter stringFromDate: date]; NSLog (@ "% @", time); // defines a range. It is used to specify the string of a range, such as nsange range = NSMakeRange (5, 4 ); // create an NSString object quickly. The storage name is NSString * str = @ "name: Jack"; // create an NSNumber object. The storage number is NSNumber * number = [NSNumber numberWithInt: 1]; // create an unchangeable array and store multiple name objects NSArray * objects = @ [str, @ "name: Lily", @ "name: Lucy"]; // create a variable array and store multiple student ID objects NSMutableArray * keys = [NSMutableArray arrayWithObjects: number, @ 2, @ 3, nil]; // create a variable dictionary, through the array objects, keys initializes NSMutableDictionary * dictionary = [[NSMutableDictionary alloc] initWithObjects: objects forKeys: keys]; // quickly traverses the objects array for (id obj in objects) {// locate the substring NSString * name = [obj substringWithRange: range]; NSLog (@ "% @", name);} specified range in obj );} // traverse the element [dictionary enumerateKeysAndObjectsUsingBlock: ^ (id key, id obj, BOOL * stop) {NSLog (@ "% @-% @", key, [obj substringWithRange: range]); if ([[obj substringWithRange: range] isdue to: @ "Jack"]) {// stop * stop = YES ;}}] when traversing to Jack; // clear the key-value pair with the key value of @ 1 [dictionary removeObjectForKey: @ 1]; // check the result. All the elements in the dictionary will be traversed and the [dictionary enumerateKeysAndObjectsUsingBlock: ^ (id key, id obj, BOOL * stop) will not be stopped) {NSLog (@ "% @-% @", key, [obj substringWithRange: range]); if ([[obj substringWithRange: range] isto to: @ "Jack"]) {// stop when traversal to Jack (this key-value pair is not in the dictionary and will not be stopped) * stop = YES ;}}] ;} return 0 ;}