Start from scratch-07. common structures of the foundation framework

I. Use of common structures of the foundation framework: nsange \ cgrange, nspoint \ cgpoint, nssize \ cgsize, nsrect \ cgrect

1. Basic usage:

// Use nsange R1 = nsmakerange (2, 4) for the nsange; // The first parameter is. location, the second parameter is. length nsstring * STR = @ "Learning OC"; nsange range = [STR rangeofstring: @ "Learning"]; // locate the position and length of a string in the STR string nslog (@ "loc = % lD, Len = % lD", range. location, range. length); nsange range1 = [STR rangeofstring: @ "not found"]; // searches for the position and length of a string in the STR string nslog (@ "loc = % d, len = % lD ", range1.location, range1.length); // if the location cannot be found, the return value of location is-1. A negative number is generated only when the location value is output to % d, by default, % LD is unsigned. // cgpoint is used for cgpoint point1 = nsmakepoint (10, 10); nspoint point2 = cgpointmake (10, 10 ); // This method is often used to define a cgpoint object // nsszie's nssize size1 = cgsizemake (10, 20); cgsize size2 = nsmakesize (10, 20 ); // use cgrect rect1 = cgrectmake (0, 0, 50, 50); cgrect rect2 = {point1, size1 }; // Method for printing struct nsstring * s = nsstringfrompoint (point1); nslog (@ "% @", S); nsstring * S1 = nsstringfromrect (rect1 ); nslog (@ "% @", S1 );

2. Other related methods

// Determine whether the struct nspoint \ cgpoint, nssize \ cgsize, nsrect \ cgrect contains the same value cgpointequaltopoint (point1, point2); cgrectequaltorect (rect1, rect2); reset (rect1, rect2); // determines whether a rect contains a certain point. The framework coregraphic must be referenced. to call the cgrectcontainspoint method bool b1 = cgrectcontainspoint (rect1, point1); nslog (@ "% d", B1); Return 0;

Ii. common foundation framework classes

1. nsstring

// Create a string nsstring * S1 = @ "test"; nsstring * S2 = [[nsstring alloc] initwithformat: @ "test is % C", 'C']; // This method can convert a C string to an OC string nsstring * S3 = [[nsstring alloc] initwithuf8string: "name"]; // convert the OC string to the C string const char * cs = [S3 utf8string]; nsstring * S4 = [[nsstring alloc] initwithcontentsoffile: @ "/users/lpmac/desktop/My. text "encoding: nsutf8stringencoding error: Nil]; [nsstring stringwithcontentsoffile: @"/users/lpmac/desktop/My. text "encoding: nsutf8stringencoding error: Nil]; nsurl * url = [[nsurl alloc] initwithstring: @" file: // users/lpmac/desktop/My. text "]; // method of the class [nsurl urlwithstring: @" file: // users/lpmac/desktop/My. text "]; nsstring * S5 = [[nsstring alloc] initwithcontentsofurl: URL encoding: nsutf8stringencoding error: Nil]; // method of the class [nsstring stringwithcontentsoffile: @" file: /// users/lpmac/desktop/My. text "encoding: nsutf8stringencoding error: Nil]; nslog (@" % @ ", S5 );

2. Use of nsmutablestring (Dynamic string)

Nsmutablestring * mutablestring1 = [nsmutablestring stringwithformat: @ "test"]; // concatenate a string [mutablestring1 appendstring: @ "APPEND Str"]; // Delete the nsange range = [mutablestring1 rangeofstring: @ "test"]; [mutablestring1 deletecharactersinrange: range]; nslog (@ "% @", mutablestring1 );

3. nsarray and nsmutablearray

// Nsarray * array = [nsarray arraywithobject: @ "test"]; nsarray * array1 = [nsarray arraywithobjects: @ "test1", @ "Test2 ", @ "Test2", nil]; nsarray * array2 = @ [@ "test1", @ "Test2", @ "Test2"]; // advocate quick writing // array access [array1 objectatindex: 0]; array1 [0]; // advocate // array traversal for (INT I = 0; I <array. count; I ++) {nslog (@ "% @", array [I]);}

// Quickly traverse for (id obj in array2) {nsuinteger loc = [array2 indexofobject: OBJ]; nslog (@ "% @, % lD", OBJ, Loc );} [array2 enumerateobjectsusingblock: ^ (id obj, nsuinteger idx, bool * Stop) {nslog (@ "% @, % lD", OBJ, idx); If (idx = 1) {* Stop = Yes ;}}];

Nsmutablearray is a dynamic array and cannot be initialized using the syntax @ [].

Start from scratch-07. common structures of the foundation framework