Objective-C basic notes (7) common structures in Foundation

Objective-C basic notes (7) common structures in Foundation

1. nsange

Definition of nsange:

typedef struct _NSRange {    NSUInteger location;    NSUInteger length;} NSRange;

Use of nsanage:

    NSRange range = NSMakeRange(8, 10);        NSLog(@"location:%zi", range.location);    NSLog(@"length:%zi", range.length);        NSString *str = NSStringFromRange(range);    NSLog(@"%@", str);

Ii. NSPoint

NSPoint definition:

Typedef CGPoint NSPoint;

struct CGPoint {  CGFloat x;  CGFloat y;};typedef struct CGPoint CGPoint;

NSPoint usage:

NSPoint p; p. x = 10; p. y = 10; p = NSMakePoint (11, 11); // common method: p = CGPointMake (12, 12); NSString * str = NSStringFromPoint (p ); NSLog (@ "% @", str );

Iii. NSSize

NSSize definition:

Typedef CGSize NSSize;

struct CGSize {  CGFloat width;  CGFloat height;};typedef struct CGSize CGSize;

NSSize usage:

    NSSize s;    s.width = 100.1;    s.height = 100.3;        s = NSMakeSize(12.3, 16.9);        s = CGSizeMake(15.3, 19.2);        NSString *str = NSStringFromSize(s);    NSLog(@"%@", str);

Iv. NSRect

NSRect definition:

Typedef CGRect NSRect;

struct CGRect {  CGPoint origin;  CGSize size;};typedef struct CGRect CGRect;

NSRect usage:

    NSRect r;    //r.origin.x = 11;    //r.origin.y = 13;    r.origin = NSMakePoint(50, 50);    r.size = NSMakeSize(60, 60);        r = NSMakeRect(20, 20, 30, 30);