Blackhorse programmer _ objective-C Foundation notes (1)

Struct

Nsange:

 

Used to indicate the range

 

Create

Nsange R1 = {2, 4}

Nsange r2 = {. Location = 2,. Length = 4}

Nsange R3 = nsmakerange (2, 4)

 

Search for the range of a string in Str

Nsstring * STR = @ "I love OC ";

Nsange range = [STR rangeofstring: @ "Java"]

Nslog (@ "location = % lD, length = % lD", range. Location, range. length)

 

If not found, length = 0, location = nsnotfound =-1

 

 

Nspoint:

 

Used to represent the coordinates of a point

Create

 

Cgpoint p1 = nsmakepoint (10, 10 );

Nspoint P2 = cgpointmake (20, 20 );

Indicates the origin

Cgpointzero = cgpointmake (0, 0)

 

Nssize:

 

Indicates the size of a two-dimensional plane.

 

Nssize S1 = cgsizemake (100, 50 );

Nssize S2 = nsmakesize (100, 50 );

Cgsize S3 = nsmakesize (200, 60 );

 

Cgrect:

 

Represents a specific dimension and position of a two-dimensional plane.

 

Cgrectr1 = cgrectmake (0, 0,100, 50 );

Cgrect r2 = {0, 0 },{ 100, 90 }};

Cgrect R3 = {p1, S2 };

 

Another method for defining cgrect

 

 

Cgrect myrect (cgfloat X, cgfloat y, cgfloat width, cgfloat height)

{

Cgrect rect;

Rect. Origin. x = X;

Rect. Origin. Y = y;

Rect. Size. width = width;

Rect. Size. Height = height;

}

 

Convert struct to string

Nsstring * STR = nsstringfrompoint (P1 );

Nsstring * STR = nsstringfromsize (S3 );

Nsstring * STR = nsstringfromrect (R1 );

Compare whether the two points are the same (x, y)

Bool B = cgpointequaltopoint (cgpointmake (10, 10), cgpointmake (10, 10 ))

Determines whether a point is in a region.

Bool b2 = cgrectcontainspoint (cgrectmake (50, 40,100, 50), cgpointmake (60, 45 ))

 

The premise of using these cgpointequaltopoint, cgrectcontainspoint, and other functions is to add the CoreGraphics framework.

 

Nsstring

 

String Creation

 

Nsstring * S1 = @ "Jack ";

Nsstring * S2 = [[nsstring alloc] initwithstring: @ "Jack"];

Nsstring * S3 = [[nsstring alloc] initwithformat: @ "Age is % d", 10];

C string> C string

Const char * c = [S4 utf8string];

Nsutf8stringencoding can be used in Chinese.

Nsstring * S5 = [[nsstring alloc] initwithcontentsoffile: @ "/users/Apple/desktop/1.txt" encoding: nsutf8stringencoding error: Nil];

 

String Export

 

Nsstring * STR = @ "4234234 ";

Nsurl * url = [nsurl fileurlwithpath: @ "/users/Apple/desktop/my2.txt"];

[STR writetourl: URL atomically: Yes encoding: nsutf8stringencoding error: Nil];

 

Or

[@ "Jack \ njack" writetofile: @ "/users/Apple/desktop/my.txt" atomically: Yes encoding: nsutf8stringencoding error: Nil]

 

Nsmutablestring

 

Variable string

 

Nsmutablestring * S1 = [nsmutablestring stringwithformat: @ "My age is 10"];

 

Splice content to the end of S1

[S1 appendstring: @ "11 12"];

Obtain the is range

Nsange range = [S1 rangeofstring: @ "is"];

Delete is

[S1 deletecharactersinrange: range];

 

Immutable strings can also be concatenated into two strings

Nsstring * S2 = [nsstring stringwithformat: @ "Age is 10"];

Nsstring * S3 = [S2 stringbyappendingstring: @ "11 12"];

 

Additional knowledge: nsurl

 

File: // local resource protocol header

Http: // network resource protocol header

 

Create a resource path

Nsurl * url = [[nsurl alloc] initwithstring: @ "file: // users/Apple/desktop/1.txt"] local resource

Nsurl * url = [nsurl fileurlwithpath: @ "/users/Apple/desktop/1.txt"] local resource

 

Converts a resource path to a string.

Nsstring * S6 = [[nsstring alloc] initwithcontentsofurl: URL encoding: nsutf8stringencoding error: Nil]

Blackhorse programmer _ objective-C Foundation notes (1)