Structures commonly used in Objective-C: nsange, NSPoint, NSSize (CGSize), NSRect

Structures commonly used in Objective-C: nsange, NSPoint, NSSize (CGSize), NSRect

Structures commonly used in Objective-C: nsange, NSPoint, NSSize (CGSize), NSRect

1 nsange

The prototype of nsange is

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

NSMakeRange Functions

NS_INLINEz is the inline function typedef nsange * nsangepointer; NS_INLINE nsange NSMakeRange (NSUInteger loc, NSUInteger len) {nsange r; r. location = loc; r. length = len; return r ;}

Usage

// The Value of "nsange range" indicates the range of "nsange range" and "range. location = 18; range. length = 34; NSLog (@ "location is % zi", range. location); NSLog (@ "length is % zi", range. length); // quickly create range = NSMakeRange (8, 10); NSLog (@ "location is % zi", range. location); NSLog (@ "length is % zi", range. length); // NSStringFromRange converts the above struct to the string type and prints the NSString * str1 = NSStringFromRange (range); // % @ is an OC object, range represents a struct, and str is an OC object NSLog (@ "rang is % @", str1 );

2 NSPoint

NSPoint prototype

struct CGPoint {     CGFloat x;     CGFloat y;     };

NSMakePoint Function

NS_INLINE NSPoint NSMakePoint(CGFloat x, CGFloat y) {     NSPoint p;     p.x = x;     p.y = y;     return p;     }

CGPointMake Function

CGPointMake(CGFloat x, CGFloat y)     {     CGPoint p; p.x = x; p.y = y; return p;     }

Usage

// NSPoint indicates the position NSPoint point; // assign a value to the point in the struct. x = 10; point. y = 10; // quickly create a vertex point = NSMakePoint (10, 18); // a common function is CGPointMake's Function point = CGPointMake (29, 78 ); NSString * str2 = NSStringFromPoint (point); NSLog (@ "point is % @", str2 );

3 CGSize

CGSize prototype

struct CGSize {     CGFloat width;     CGFloat height;     };

NSMakeSize Function

NS_INLINE NSSize NSMakeSize(CGFloat w, CGFloat h) {     NSSize s;     s.width = w;     s.height = h;     return s;     }

CGSizeMake Function

CGSizeMake(CGFloat width, CGFloat height)     {     CGSize size; size.width = width; size.height = height; return size;     }

Usage

 NSSize size;       size.width = 100;    size.height = 12;    size = NSMakeSize(12, 12);    size = CGSizeMake(11, 11);        NSString* str3 = NSStringFromSize(size);    NSLog(@"%@",str3);

4 CGRect

CGRect prototype

struct CGRect {     CGPoint origin;     CGSize size;     };

CGRectMake Function

CGRectMake(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;     return rect;     }

NSMakeRect Function

NS_INLINE NSRect NSMakeRect(CGFloat x, CGFloat y, CGFloat w, CGFloat h) {     NSRect r;     r.origin.x = x;     r.origin.y = y;     r.size.width = w;     r.size.height = h;     return r;     }

Usage

// Contains both the size and position of NSRect rect; rect. origin. x = 12; rect. origin. y = 14; rect. size. width = 12; rect. size. height = 15; // quick creation method rect = CGRectMake (12, 12, 12, 12); rect = NSMakeRect (11, 11, 11, 11 ); // print NSString * str5 = NSStringFromRect (rect); NSLog (@ "rect is % @", str5 );